// machine generated, do not edit

package sokol_gfx

/*

    sokol_gfx.h -- simple 3D API wrapper

    Project URL: https://github.com/floooh/sokol

    Example code: https://github.com/floooh/sokol-samples

    Do this:
        #define SOKOL_IMPL or
        #define SOKOL_GFX_IMPL
    before you include this file in *one* C or C++ file to create the
    implementation.

    In the same place define one of the following to select the rendering
    backend:
        #define SOKOL_GLCORE
        #define SOKOL_GLES3
        #define SOKOL_D3D11
        #define SOKOL_METAL
        #define SOKOL_WGPU
        #define SOKOL_VULKAN
        #define SOKOL_DUMMY_BACKEND

    I.e. for the desktop GL it should look like this:

    #include ...
    #include ...
    #define SOKOL_IMPL
    #define SOKOL_GLCORE
    #include "sokol_gfx.h"

    The dummy backend replaces the platform-specific backend code with empty
    stub functions. This is useful for writing tests that need to run on the
    command line.

    Optionally provide the following defines with your own implementations:

    SOKOL_ASSERT(c)             - your own assert macro (default: assert(c))
    SOKOL_UNREACHABLE()         - a guard macro for unreachable code (default: assert(false))
    SOKOL_GFX_API_DECL          - public function declaration prefix (default: extern)
    SOKOL_API_DECL              - same as SOKOL_GFX_API_DECL
    SOKOL_API_IMPL              - public function implementation prefix (default: -)
    SOKOL_TRACE_HOOKS           - enable trace hook callbacks (search below for TRACE HOOKS)
    SOKOL_EXTERNAL_GL_LOADER    - indicates that you're using your own GL loader, in this case
                                  sokol_gfx.h will not include any platform GL headers and disable
                                  the integrated Win32 GL loader

    If sokol_gfx.h is compiled as a DLL, define the following before
    including the declaration or implementation:

    SOKOL_DLL

    On Windows, SOKOL_DLL will define SOKOL_GFX_API_DECL as __declspec(dllexport)
    or __declspec(dllimport) as needed.

    Optionally define the following to force debug checks and validations
    even in release mode:

    SOKOL_DEBUG - by default this is defined if NDEBUG is not defined

    Link with the following system libraries (note that sokol_app.h has
    additional linker requirements):

    - on macOS/iOS with Metal: Metal
    - on macOS with GL: OpenGL
    - on iOS with GL: OpenGLES
    - on Linux with EGL: GL or GLESv2
    - on Linux with GLX: GL
    - on Android: GLESv3, log, android
    - on Windows with the MSVC or Clang toolchains: no action needed, libs are defined in-source via pragma-comment-lib
    - on Windows with MINGW/MSYS2 gcc: compile with '-mwin32' so that _WIN32 is defined
        - with the D3D11 backend: -ld3d11

    On macOS and iOS, the implementation must be compiled as Objective-C.

    On Emscripten:
        - for WebGL2: add the linker option `-s USE_WEBGL2=1`
        - for WebGPU: compile and link with `--use-port=emdawnwebgpu`
          (for more exotic situations, read: https://dawn.googlesource.com/dawn/+/refs/heads/main/src/emdawnwebgpu/pkg/README.md)

    sokol_gfx DOES NOT:
    ===================
    - create a window, swapchain or the 3D-API context/device, you must do this
      before sokol_gfx is initialized, and pass any required information
      (like 3D device pointers) to the sokol_gfx initialization call

    - present the rendered frame, how this is done exactly usually depends
      on how the window and 3D-API context/device was created

    - provide a unified shader language, instead 3D-API-specific shader
      source-code or shader-bytecode must be provided (for the "official"
      offline shader cross-compiler / code-generator, see here:
      https://github.com/floooh/sokol-tools/blob/master/docs/sokol-shdc.md)


    STEP BY STEP
    ============
    --- to initialize sokol_gfx, after creating a window and a 3D-API
        context/device, call:

            sg_setup(const sg_desc*)

        Depending on the selected 3D backend, sokol-gfx requires some
        information about its runtime environment, like a GPU device pointer,
        default swapchain pixel formats and so on. If you are using sokol_app.h
        for the window system glue, you can use a helper function provided in
        the sokol_glue.h header:

            #include "sokol_gfx.h"
            #include "sokol_app.h"
            #include "sokol_glue.h"
            //...
            sg_setup(&(sg_desc){
                .environment = sglue_environment(),
            });

        To get any logging output for errors and from the validation layer, you
        need to provide a logging callback. Easiest way is through sokol_log.h:

            #include "sokol_log.h"
            //...
            sg_setup(&(sg_desc){
                //...
                .logger.func = slog_func,
            });

    --- create resource objects (buffers, images, views, samplers, shaders
        and pipeline objects)

            sg_buffer sg_make_buffer(const sg_buffer_desc*)
            sg_image sg_make_image(const sg_image_desc*)
            sg_view sg_make_view(const sg_view_desc*)
            sg_sampler sg_make_sampler(const sg_sampler_desc*)
            sg_shader sg_make_shader(const sg_shader_desc*)
            sg_pipeline sg_make_pipeline(const sg_pipeline_desc*)

    --- start a render- or compute-pass:

            sg_begin_pass(const sg_pass* pass);

        Typically, render passes render into an externally provided swapchain which
        presents the rendering result on the display. Such a 'swapchain pass'
        is started like this:

            sg_begin_pass(&(sg_pass){ .action = { ... }, .swapchain = sglue_swapchain() })

        ...where .action is an sg_pass_action struct containing actions to be performed
        at the start and end of a render pass (such as clearing the render surfaces to
        a specific color), and .swapchain is an sg_swapchain struct with all the required
        information to render into the swapchain's surfaces.

        To start an 'offscreen render pass' into sokol-gfx image objects, populate
        the sg_pass.attachments nested struct with attachment view objects
        (1..4 color-attachment-views for to render into, a depth-stencil-attachment-view
        to provide the depth-stencil-buffer, and optionally 1..4 resolve-attachment-views
        for an MSAA-resolve operation:

            sg_begin_pass(&(sg_pass){
                .action = { ... },
                .attachments = {
                    .colors[0] = color_attachment_view,
                    .resolves[0] = optional_resolve_attachment_view,
                    .depth_stencil = depth_stencil_attachment_view,
                },
            });

        To start a compute-pass, just set the .compute item to true:

            sg_begin_pass(&(sg_pass){ .compute = true });

    --- set the pipeline state for the next draw call with:

            sg_apply_pipeline(sg_pipeline pip)

    --- fill an sg_bindings struct with the resource bindings for the next
        draw- or dispatch-call (0..N vertex buffers, 0 or 1 index buffer, 0..N views,
        0..N samplers), and call

            sg_apply_bindings(const sg_bindings* bindings)

        ...to update the resource bindings. Note that in a compute pass, no vertex-
        or index-buffer bindings can be used, and in render passes, no storage-image bindings
        are allowed. Those restrictions will be checked by the sokol-gfx validation layer.

    --- optionally update shader uniform data with:

            sg_apply_uniforms(int ub_slot, const sg_range* data)

        Read the section 'UNIFORM DATA LAYOUT' to learn about the expected memory layout
        of the uniform data passed into sg_apply_uniforms().

    --- kick off a draw call with:

            sg_draw(int base_element, int num_elements, int num_instances)

        The sg_draw() function unifies all the different ways to render primitives
        in a single call (indexed vs non-indexed rendering, and instanced vs non-instanced
        rendering). In case of indexed rendering, base_element and num_element specify
        indices in the currently bound index buffer. In case of non-indexed rendering
        base_element and num_elements specify vertices in the currently bound
        vertex-buffer(s). To perform instanced rendering, the rendering pipeline
        must be setup for instancing (see sg_pipeline_desc below), a separate vertex buffer
        containing per-instance data must be bound, and the num_instances parameter
        must be > 1.

        Alternatively, call:

            sg_draw_ex(...)

        to provide a base-vertex and/or base-instance which allows to render
        from different sections of a vertex buffer without rebinding the
        vertex buffer with a different offset. Note that the `sg_draw_ex()`
        only has limited portability on OpenGL, check the sg_limits struct
        members .draw_base_vertex and .draw_base_instance for runtime support,
        those are generally true on non-GL-backends, and on GL the feature
        flags are set according to the GL version:

            - on GL base_instance != 0 is only supported since GL 4.2
            - on GLES3.x, base_instance != 0 is not supported
            - on GLES3.x, base_vertex is only supported since GLES3.2
              (e.g. not supported on WebGL2)

    --- ...or kick of a dispatch call to invoke a compute shader workload:

            sg_dispatch(int num_groups_x, int num_groups_y, int num_groups_z)

        The dispatch args define the number of 'compute workgroups' processed
        by the currently applied compute shader.

    --- finish the current pass with:

            sg_end_pass()

    --- when done with the current frame, call

            sg_commit()

    --- at the end of your program, shutdown sokol_gfx with:

            sg_shutdown()

    --- if you need to destroy resources before sg_shutdown(), call:

            sg_destroy_buffer(sg_buffer buf)
            sg_destroy_image(sg_image img)
            sg_destroy_sampler(sg_sampler smp)
            sg_destroy_shader(sg_shader shd)
            sg_destroy_pipeline(sg_pipeline pip)
            sg_destroy_view(sg_view view)

    --- to set a new viewport rectangle, call:

            sg_apply_viewport(int x, int y, int width, int height, bool origin_top_left)

        ...or if you want to specify the viewport rectangle with float values:

            sg_apply_viewportf(float x, float y, float width, float height, bool origin_top_left)

    --- to set a new scissor rect, call:

            sg_apply_scissor_rect(int x, int y, int width, int height, bool origin_top_left)

        ...or with float values:

            sg_apply_scissor_rectf(float x, float y, float width, float height, bool origin_top_left)

        Both sg_apply_viewport() and sg_apply_scissor_rect() must be called
        inside a rendering pass (e.g. not in a compute pass, or outside a pass)

        Note that sg_begin_pass() will reset both the viewport and scissor
        rectangles to cover the entire framebuffer.

    --- to update (overwrite) the content of buffer and image resources, call:

            sg_update_buffer(sg_buffer buf, const sg_range* data)
            sg_update_image(sg_image img, const sg_image_data* data)

        Buffers and images to be updated must have been created with
        sg_buffer_desc.usage.dynamic_update or .stream_update.

        Only one update per frame is allowed for buffer and image resources when
        using the sg_update_*() functions. The rationale is to have a simple
        protection from the CPU scribbling over data the GPU is currently
        using, or the CPU having to wait for the GPU

        Buffer and image updates can be partial, as long as a rendering
        operation only references the valid (updated) data in the
        buffer or image.

    --- to append a chunk of data to a buffer resource, call:

            int sg_append_buffer(sg_buffer buf, const sg_range* data)

        The difference to sg_update_buffer() is that sg_append_buffer()
        can be called multiple times per frame to append new data to the
        buffer piece by piece, optionally interleaved with draw calls referencing
        the previously written data.

        sg_append_buffer() returns a byte offset to the start of the
        written data, this offset can be assigned to
        sg_bindings.vertex_buffer_offsets[n] or
        sg_bindings.index_buffer_offset

        Code example:

        for (...) {
            const void* data = ...;
            const int num_bytes = ...;
            int offset = sg_append_buffer(buf, &(sg_range) { .ptr=data, .size=num_bytes });
            bindings.vertex_buffer_offsets[0] = offset;
            sg_apply_pipeline(pip);
            sg_apply_bindings(&bindings);
            sg_apply_uniforms(...);
            sg_draw(...);
        }

        A buffer to be used with sg_append_buffer() must have been created
        with sg_buffer_desc.usage.dynamic_update or .stream_update.

        If the application appends more data to the buffer then fits into
        the buffer, the buffer will go into the "overflow" state for the
        rest of the frame.

        Any draw calls attempting to render an overflown buffer will be
        silently dropped (in debug mode this will also result in a
        validation error).

        You can also check manually if a buffer is in overflow-state by calling

            bool sg_query_buffer_overflow(sg_buffer buf)

        You can manually check to see if an overflow would occur before adding
        any data to a buffer by calling

            bool sg_query_buffer_will_overflow(sg_buffer buf, size_t size)

        NOTE: Due to restrictions in underlying 3D-APIs, appended chunks of
        data will be 4-byte aligned in the destination buffer. This means
        that there will be gaps in index buffers containing 16-bit indices
        when the number of indices in a call to sg_append_buffer() is
        odd. This isn't a problem when each call to sg_append_buffer()
        is associated with one draw call, but will be problematic when
        a single indexed draw call spans several appended chunks of indices.

    --- to check at runtime for optional features, limits and pixelformat support,
        call:

            sg_features sg_query_features()
            sg_limits sg_query_limits()
            sg_pixelformat_info sg_query_pixelformat(sg_pixel_format fmt)

    --- if you need to call into the underlying 3D-API directly, you must call:

            sg_reset_state_cache()

        ...before calling sokol_gfx functions again

    --- you can inspect the original sg_desc structure handed to sg_setup()
        by calling sg_query_desc(). This will return an sg_desc struct with
        the default values patched in instead of any zero-initialized values

    --- you can get a desc struct matching the creation attributes of a
        specific resource object via:

            sg_buffer_desc sg_query_buffer_desc(sg_buffer buf)
            sg_image_desc sg_query_image_desc(sg_image img)
            sg_sampler_desc sg_query_sampler_desc(sg_sampler smp)
            sg_shader_desc sq_query_shader_desc(sg_shader shd)
            sg_pipeline_desc sg_query_pipeline_desc(sg_pipeline pip)
            sg_view_desc sg_query_view_desc(sg_view view)

        ...but NOTE that the returned desc structs may be incomplete, only
        creation attributes that are kept around internally after resource
        creation will be filled in, and in some cases (like shaders) that's
        very little. Any missing attributes will be set to zero. The returned
        desc structs might still be useful as partial blueprint for creating
        similar resources if filled up with the missing attributes.

        Calling the query-desc functions on an invalid resource will return
        completely zeroed structs (it makes sense to check  the resource state
        with sg_query_*_state() first)

    --- you can query the default resource creation parameters through the functions

            sg_buffer_desc sg_query_buffer_defaults(const sg_buffer_desc* desc)
            sg_image_desc sg_query_image_defaults(const sg_image_desc* desc)
            sg_sampler_desc sg_query_sampler_defaults(const sg_sampler_desc* desc)
            sg_shader_desc sg_query_shader_defaults(const sg_shader_desc* desc)
            sg_pipeline_desc sg_query_pipeline_defaults(const sg_pipeline_desc* desc)
            sg_view_desc sg_query_view_defaults(const sg_view_desc* desc)

        These functions take a pointer to a desc structure which may contain
        zero-initialized items for default values. These zero-init values
        will be replaced with their concrete values in the returned desc
        struct.

    --- you can inspect various internal resource runtime values via:

            sg_buffer_info sg_query_buffer_info(sg_buffer buf)
            sg_image_info sg_query_image_info(sg_image img)
            sg_sampler_info sg_query_sampler_info(sg_sampler smp)
            sg_shader_info sg_query_shader_info(sg_shader shd)
            sg_pipeline_info sg_query_pipeline_info(sg_pipeline pip)
            sg_view_info sg_query_view_info(sg_view view)

        ...please note that the returned info-structs are tied quite closely
        to sokol_gfx.h internals, and may change more often than other
        public API functions and structs.

    -- you can query the type/flavour and parent resource of a view:

            sg_view_type sg_query_view_type(sg_view view)
            sg_image sg_query_view_image(sg_view view)
            sg_buffer sg_query_view_buffer(sg_view view)

    --- you can query stats and control stats collection via:

            sg_query_stats()
            sg_enable_stats()
            sg_disable_stats()
            sg_stats_enabled()

    --- you can ask at runtime what backend sokol_gfx.h has been compiled for:

            sg_backend sg_query_backend(void)

    --- call the following helper functions to compute the number of
        bytes in a texture row or surface for a specific pixel format.
        These functions might be helpful when preparing image data for consumption
        by sg_make_image() or sg_update_image():

            int sg_query_row_pitch(sg_pixel_format fmt, int width, int int row_align_bytes);
            int sg_query_surface_pitch(sg_pixel_format fmt, int width, int height, int row_align_bytes);

        Width and height are generally in number pixels, but note that 'row' has different meaning
        for uncompressed vs compressed pixel formats: for uncompressed formats, a row is identical
        with a single line if pixels, while in compressed formats, one row is a line of *compression blocks*.

        This is why calling sg_query_surface_pitch() for a compressed pixel format and height
        N, N+1, N+2, ... may return the same result.

        The row_align_bytes parameter is for added flexibility. For image data that goes into
        the sg_make_image() or sg_update_image() this should generally be 1, because these
        functions take tightly packed image data as input no matter what alignment restrictions
        exist in the backend 3D APIs.

    ON INITIALIZATION:
    ==================
    When calling sg_setup(), a pointer to an sg_desc struct must be provided
    which contains initialization options. These options provide two types
    of information to sokol-gfx:

        (1) upper bounds and limits needed to allocate various internal
            data structures:
                - the max number of resources of each type that can
                  be alive at the same time, this is used for allocating
                  internal pools
                - the max overall size of uniform data that can be
                  updated per frame, including a worst-case alignment
                  per uniform update (this worst-case alignment is 256 bytes)
                - the max size of all dynamic resource updates (sg_update_buffer,
                  sg_append_buffer and sg_update_image) per frame
                - the max number of compute-dispatch calls in a compute pass
            Not all of those limit values are used by all backends, but it is
            good practice to provide them none-the-less.

        (2) 3D backend "environment information" in a nested sg_environment struct:
            - pointers to backend-specific context- or device-objects (for instance
              the D3D11, WebGPU or Metal device objects)
            - defaults for external swapchain pixel formats and sample counts,
              these will be used as default values in image and pipeline objects,
              and the sg_swapchain struct passed into sg_begin_pass()
            Usually you provide a complete sg_environment struct through
            a helper function, as an example look at the sglue_environment()
            function in the sokol_glue.h header.

    See the documentation block of the sg_desc struct below for more information.


    ON RENDER PASSES
    ================
    Relevant samples:
        - https://floooh.github.io/sokol-html5/offscreen-sapp.html
        - https://floooh.github.io/sokol-html5/offscreen-msaa-sapp.html
        - https://floooh.github.io/sokol-html5/mrt-sapp.html
        - https://floooh.github.io/sokol-html5/mrt-pixelformats-sapp.html

    A render pass groups rendering commands into a set of render target images
    (called 'render pass attachments'). Render target images can be used in subsequent
    passes as textures (it is invalid to use the same image both as render target
    and as texture in the same pass).

    The following sokol-gfx functions must only be called inside a render-pass:

        sg_apply_viewport[f]
        sg_apply_scissor_rect[f]
        sg_draw

    The following function may be called inside a render- or compute-pass, but
    not outside a pass:

        sg_apply_pipeline
        sg_apply_bindings
        sg_apply_uniforms

    A frame must have at least one 'swapchain render pass' which renders into an
    externally provided swapchain provided as an sg_swapchain struct to the
    sg_begin_pass() function. If you use sokol_gfx.h together with sokol_app.h,
    just call the sglue_swapchain() helper function in sokol_glue.h to
    provide the swapchain information. Otherwise the following information
    must be provided:

        - the color pixel-format of the swapchain's render surface
        - an optional depth/stencil pixel format if the swapchain
          has a depth/stencil buffer
        - an optional sample-count for MSAA rendering
        - NOTE: the above three values can be zero-initialized, in that
          case the defaults from the sg_environment struct will be used that
          had been passed to the sg_setup() function.
        - a number of backend specific objects:
            - GL/GLES3: just a GL framebuffer handle
            - D3D11:
                - an ID3D11RenderTargetView for the rendering surface
                - if MSAA is used, an ID3D11RenderTargetView as
                  MSAA resolve-target
                - an optional ID3D11DepthStencilView for the
                  depth/stencil buffer
            - WebGPU
                - a WGPUTextureView object for the rendering surface
                - if MSAA is used, a WGPUTextureView object as MSAA resolve target
                - an optional WGPUTextureView for the
            - Metal (NOTE that the roles of provided surfaces is slightly
              different in Metal than in D3D11 or WebGPU, notably, the
              CAMetalDrawable is either rendered to directly, or serves
              as MSAA resolve target):
                - a CAMetalDrawable object which is either rendered
                  into directly, or in case of MSAA rendering, serves
                  as MSAA-resolve-target
                - if MSAA is used, an multisampled MTLTexture where
                  rendering goes into
                - an optional MTLTexture for the depth/stencil buffer

    It's recommended that you create a helper function which returns an
    initialized sg_swapchain struct by value. This can then be directly plugged
    into the sg_begin_pass function like this:

        sg_begin_pass(&(sg_pass){ .swapchain = sglue_swapchain() });

    As an example for such a helper function check out the function sglue_swapchain()
    in the sokol_glue.h header.

    For offscreen render passes, the render target images used in a render pass
    must be provided as sg_view objects specialized for the specific pass-attachment
    types:

        - color-attachment-views for color-rendering
        - depth-stencil-attachment-views for the depth-stencil-buffer surface
        - resolve-attachment-views for MSAA-resolve operations

    For a simple offscreen scenario with one color-, one depth-stencil-render
    target and without multisampling, setting up the required image-
    and view-objects looks like this:

    First create two render target images, one with a color pixel format,
    and one with the depth- or depth-stencil pixel format. Both images
    must have the same dimensions. Also not the usage flags:

        const sg_image color_img = sg_make_image(&(sg_image_desc){
            .usage.color_attachment = true,
            .width = 256,
            .height = 256,
            .pixel_format = SG_PIXELFORMAT_RGBA8,
            .sample_count = 1,
        });
        const sg_image depth_img = sg_make_image(&(sg_image_desc){
            .usage.depth_stencil_attachment = true,
            .width = 256,
            .height = 256,
            .pixel_format = SG_PIXELFORMAT_DEPTH,
            .sample_count = 1,
        });

    NOTE: when creating render target images, have in mind that some default values
    are aligned with the default environment attributes in the sg_environment struct
    that was passed into the sg_setup() call:

        - the default value for sg_image_desc.pixel_format is taken from
          sg_environment.defaults.color_format
        - the default value for sg_image_desc.sample_count is taken from
          sg_environment.defaults.sample_count
        - the default value for sg_image_desc.num_mipmaps is always 1

    Next, create two view objects, one color-attachment-view and one
    depth-stencil-attachment view:

        const sg_view color_att_view = sg_make_view(&(sg_view_desc){
            .color_attachment.image = color_img,
        });
        const sg_view depth_att_view = sg_make_view(&(sg_view_desc){
            .depth_stencil_attachment.image = depth_img,
        });

    You'll typically also want to create a texture-view on the color image
    to sample the color attachment image as texture in a later pass:

        const sg_view tex_view = sg_make_view(&(sg_view_desc){
            .texture.image = color_img,
        });

    The attachment-view objects are then passed into the sg_begin_pass function in
    place of the nested swapchain struct:

        sg_begin_pass(&(sg_pass){
            .attachments = {
                .colors[0] = color_att_view,
                .depth_stencil = depth_att_view,
            },
        });

    ...in a later pass when you want to sample the color attachment image as
    texture, use the texture view in the sg_apply_bindings() call:

        sg_apply_bindings(&(sg_bindings){
            .vertex_buffers[0] = ...,
            .index_buffer = ...,
            .views[VIEW_tex] = tex_view,
            .samplers[SMP_smp] = smp,
        });

    Swapchain and offscreen passes form dependency trees with a swapchain
    pass at the root, offscreen passes as nodes, and attachment images as
    dependencies between passes.

    sg_pass_action structs are used to define actions that should happen at the
    start and end of render passes (such as clearing pass attachments to a
    specific color or depth-value, or performing an MSAA resolve operation at
    the end of a pass).

    A typical sg_pass_action object which clears the color attachment to black
    might look like this:

        const sg_pass_action = {
            .colors[0] = {
                .load_action = SG_LOADACTION_CLEAR,
                .clear_value = { 0.0f, 0.0f, 0.0f, 1.0f }
            }
        };

    This omits the defaults for the color attachment store action, and
    the depth-stencil-attachments actions. The same pass action with the
    defaults explicitly filled in would look like this:

        const sg_pass_action pass_action = {
            .colors[0] = {
                .load_action = SG_LOADACTION_CLEAR,
                .store_action = SG_STOREACTION_STORE,
                .clear_value = { 0.0f, 0.0f, 0.0f, 1.0f }
            },
            .depth = = {
                .load_action = SG_LOADACTION_CLEAR,
                .store_action = SG_STOREACTION_DONTCARE,
                .clear_value = 1.0f,
            },
            .stencil = {
                .load_action = SG_LOADACTION_CLEAR,
                .store_action = SG_STOREACTION_DONTCARE,
                .clear_value = 0
            }
        };

    With the sg_pass object and sg_pass_action struct in place everything
    is ready now for the actual render pass:

    Using such this prepared sg_pass_action in a swapchain pass looks like
    this:

        sg_begin_pass(&(sg_pass){
            .action = pass_action,
            .swapchain = sglue_swapchain()
        });
        ...
        sg_end_pass();

    ...of alternatively in one offscreen pass:

        sg_begin_pass(&(sg_pass){
            .action = pass_action,
            .attachments = {
                .colors[0] = color_att_view,
                .depth_stencil = ds_att_view,
            },
        });
        ...
        sg_end_pass();

    Offscreen rendering can also go into a mipmap, or a slice/face of
    a cube-, array- or 3d-image (which some restrictions, for instance
    it's not possible to create a 3D image with a depth/stencil pixel format,
    these exceptions are generally caught by the sokol-gfx validation layer).

    The mipmap/slice selection is baked into the attachment-view objects, for
    instance to create a color-attachment-view for rendering into mip-level
    2 and slice 3 of an array texture:

        const sg_view color_att_view = sg_make_view(&(sg_view_desc){
            .color_attachment = {
                .image = color_img,
                .mip_level = 2,
                .slice = 3,
            },
        });

    If MSAA offscreen rendering is desired, the multi-sample rendering result
    must be 'resolved' into a separate 'resolve image', before that image can
    be used as texture.

    Setting up MSAA offscreen 3D rendering requires three image objects
    (one color-attachment image with a sample count > 1), a resolve-attachment
    image with a sample count of 1, and a depth-stencil-attachment image
    with the same sample count as the color-attachment image:

        const sg_image color_img = sg_make_image(&(sg_image_desc){
            .usage.color_attachment = true,
            .width = 256,
            .height = 256,
            .pixel_format = SG_PIXELFORMAT_RGBA8,
            .sample_count = 4,
        });
        const sg_image resolve_img = sg_make_image(&(sg_image_desc){
            .usage.resolve_attachment = true,
            .width = 256,
            .height = 256,
            .pixel_format = SG_PIXELFORMAT_RGBA8,
            .sample_count = 1,
        });
        const sg_image depth_img = sg_make_image(&(sg_image_desc){
            .usage.depth_stencil_attachment = true,
            .width = 256,
            .height = 256,
            .pixel_format = SG_PIXELFORMAT_DEPTH,
            .sample_count = 4,
        });

    Next you'll need the corresponding attachment-view objects:

        const sg_view color_att_view = sg_make_view(&(sg_view_desc){
            .color_attachment.image = color_img,
        });
        const sg_view resolve_att_view = sg_make_view(&(sg_view_desc){
            .resolve_attachment.image = resolve_img,
        });
        const sg_view depth_att_view = sg_make_view(&(sg_view_desc){
            .depth_stencil_attachment.image = depth_img,
        });

    To sample the rendered image as a texture in a later pass you'll also
    need a texture-view on the resolve-attachment-image (not the color-attachment-image!):

        const sg_view tex_view = sg_make_view(&(sg_view_desc){
            .texture.image = resolve_img,
        });

    Next start the render pass with all attachment-views, as soon as a
    resolve-attachment-view is provided, an MSAA resolve operation will happen
    at the end of the pass. Also note that the content of the MSAA color-attachment-image
    doesn't need to be preserved, since it's only needed until the MSAA-resolve
    at the end of the pass, so the .store_action should be set to "don't care":

        sg_begin_pass(&(sg_pass){
            .attachments = {
                .colors[0] = color_att_view,
                .resolves[0] = resolve_att_view,
                .depth_stencil = depth_att_view,
            },
            .action = {
                .colors[0] = {
                    .load_action = SG_LOADACTION_CLEAR,
                    .store_action = SG_STOREACTION_DONTCARE,
                    .clear_value = { 0.0f, 0.0f, 0.0f, 1.0f },
                }
            },
        });

    ...in a later pass, use the texture-view that had been created on the
    resolve-image to use the rendering result as texture:

        sg_apply_bindings(&(sg_bindings){
            .vertex_buffers[0] = ...,
            .index_buffer = ...,
            .views[VIEW_tex] = tex_view,
            .samplers[SMP_smp] = smp,
        });

    ON COMPUTE PASSES
    =================
    Compute passes are used to update the content of storage buffers and
    storage images by running compute shader code on
    the GPU. Updating storage resources with a compute shader will almost always
    be more efficient than computing the same data on the CPU and then uploading
    it via `sg_update_buffer()` or `sg_update_image()`.

    NOTE: compute passes are only supported on the following platforms and
    backends:

        - macOS and iOS with Metal
        - Windows with D3D11 and OpenGL
        - Linux with OpenGL or GLES3.1+
        - Web with WebGPU
        - Android with GLES3.1+

    ...this means compute shaders can't be used on the following platform/backend
    combos (the same restrictions apply to using storage buffers without compute
    shaders):

        - macOS with GL
        - iOS with GLES3
        - Web with WebGL2

    A compute pass is started with:

        sg_begin_pass(&(sg_pass){ .compute = true });

    ...and finished with a regular:

        sg_end_pass();

    Typically the following functions will be called inside a compute pass:

        sg_apply_pipeline()
        sg_apply_bindings()
        sg_apply_uniforms()
        sg_dispatch()

    The following functions are disallowed inside a compute pass
    and will cause validation layer errors:

        sg_apply_viewport[f]()
        sg_apply_scissor_rect[f]()
        sg_draw()

    Only special 'compute shaders' and 'compute pipelines' can be used in
    compute passes. A compute shader only has a compute-function instead
    of a vertex- and fragment-function pair, and it doesn't accept vertex-
    and index-buffers as bindings, only storage-buffer-views (readable
    and writable), storage-image-views (read/write or writeonly) and
    texture-views (read-only).

    A compute pipeline is created by providing a compute shader object,
    setting the .compute creation parameter to true and not defining any
    'render state':

        sg_pipeline pip = sg_make_pipeline(&(sg_pipeline_desc){
            .compute = true,
            .shader = compute_shader,
        });

    The sg_apply_bindings and sg_apply_uniforms calls are the same as in
    render passes, with the exception that no vertex- and index-buffers
    can be bound in the sg_apply_bindings call.

    Finally to kick off a compute workload, call sg_dispatch with the
    number of workgroups in the x, y and z-dimension:

        sg_dispatch(int num_groups_x, int num_groups_y, int num_groups_z)

    Also see the following compute-shader samples:

        - https://floooh.github.io/sokol-webgpu/instancing-compute-sapp.html
        - https://floooh.github.io/sokol-webgpu/computeboids-sapp.html
        - https://floooh.github.io/sokol-webgpu/imageblur-sapp.html


    ON SHADER CREATION
    ==================
    sokol-gfx doesn't come with an integrated shader cross-compiler, instead
    backend-specific shader sources or binary blobs need to be provided when
    creating a shader object, along with reflection information about the
    shader resource binding interface needed to bind sokol-gfx resources to the
    proper shader inputs.

    The easiest way to provide all this shader creation data is to use the
    sokol-shdc shader compiler tool to compile shaders from a common
    GLSL syntax into backend-specific sources or binary blobs, along with
    shader interface information and uniform blocks and storage buffer array items
    mapped to C structs.

    To create a shader using a C header which has been code-generated by sokol-shdc:

        // include the C header code-generated by sokol-shdc:
        #include "myshader.glsl.h"
        ...

        // create shader using a code-generated helper function from the C header:
        sg_shader shd = sg_make_shader(myshader_shader_desc(sg_query_backend()));

    The samples in the 'sapp' subdirectory of the sokol-samples project
    also use the sokol-shdc approach:

        https://github.com/floooh/sokol-samples/tree/master/sapp

    If you're planning to use sokol-shdc, you can stop reading here, instead
    continue with the sokol-shdc documentation:

        https://github.com/floooh/sokol-tools/blob/master/docs/sokol-shdc.md

    To create shaders with backend-specific shader code or binary blobs,
    the sg_make_shader() function requires the following information:

    - Shader code or shader binary blobs for the vertex- and fragment-, or the
      compute-shader-stage:
        - for the desktop GL backend, source code can be provided in '#version 410' or
          '#version 430', version 430 is required when using storage buffers and
          compute shaders, but note that this is not available on macOS
        - for the GLES3 backend, source code must be provided in '#version 300 es' or
          '#version 310 es' syntax (version 310 is required for storage buffer and
          compute shader support, but note that this is not supported on WebGL2)
        - for the D3D11 backend, shaders can be provided as source or binary
          blobs, the source code should be in HLSL4.0 (for compatibility with old
          low-end GPUs) or preferably in HLSL5.0 syntax, note that when
          shader source code is provided for the D3D11 backend, sokol-gfx will
          dynamically load 'd3dcompiler_47.dll'
        - for the Metal backends, shaders can be provided as source or binary blobs, the
          MSL version should be in 'metal-1.1' (other versions may work but are not tested)
        - for the WebGPU backend, shaders must be provided as WGSL source code
        - optionally the following shader-code related attributes can be provided:
            - an entry function name (only on D3D11 or Metal, but not OpenGL)
            - on D3D11 only, a compilation target (default is "vs_4_0" and "ps_4_0")

    - Information about the input vertex attributes used by the vertex shader,
      most of that backend-specific:
        - An optional 'base type' (float, signed-/unsigned-int) for each vertex
          attribute. When provided, this is used by the validation layer to check
          that the CPU-side input vertex format is compatible with the input
          vertex declaration of the vertex shader.
        - Metal: no location information needed since vertex attributes are always bound
          by their attribute location defined in the shader via '[[attribute(N)]]'
        - WebGPU: no location information needed since vertex attributes are always
          bound by their attribute location defined in the shader via `@location(N)`
        - GLSL: vertex attribute names can be optionally provided, in that case their
          location will be looked up by name, otherwise, the vertex attribute location
          can be defined with 'layout(location = N)'
        - D3D11: a 'semantic name' and 'semantic index' must be provided for each vertex
          attribute, e.g. if the vertex attribute is defined as 'TEXCOORD1' in the shader,
          the semantic name would be 'TEXCOORD', and the semantic index would be '1'

      NOTE that vertex attributes currently must not have gaps. This requirement
      may be relaxed in the future.

    - Specifically for Metal compute shaders, the 'number of threads per threadgroup'
      must be provided. Normally this is extracted by sokol-shdc from the GLSL
      shader source code. For instance the following statement in the input
      GLSL:

        layout(local_size_x=64, local_size_y=1, local_size_z=1) in;

      ...will be communicated to the sokol-gfx Metal backend in the
      code-generated sg_shader_desc struct:

        (sg_shader_desc){
            .mtl_threads_per_threadgroup = { .x = 64, .y = 1, .z = 1 },
        }

    - Information about each uniform block binding used in the shader:
        - the shader stage of the uniform block (vertex, fragment or compute)
        - the size of the uniform block in number of bytes
        - a memory layout hint (currently 'native' or 'std140') where 'native' defines a
          backend-specific memory layout which shouldn't be used for cross-platform code.
          Only std140 guarantees a backend-agnostic memory layout.
        - a backend-specific bind slot:
            - D3D11/HLSL: the buffer register N (`register(bN)`) where N is 0..7
            - Metal/MSL: the buffer bind slot N (`[[buffer(N)]]`) where N is 0..7
            - WebGPU: the binding N in `@group(0) @binding(N)` where N is 0..15
        - For GLSL only: a description of the internal uniform block layout, which maps
          member types and their offsets on the CPU side to uniform variable names
          in the GLSL shader
        - please also NOTE the documentation sections about UNIFORM DATA LAYOUT
          and CROSS-BACKEND COMMON UNIFORM DATA LAYOUT below!

    - A description of each resource binding (texture-, storage-buffer-
      and storage-image-bindings) which directly map to the sg_bindings.view[]
      array slots.

      Each resource binding slot comes in three flavours:

        1. Texture bindings with the following properties:
            - the shader stage of the texture (vertex, fragment or compute)
            - the expected image type:
                - SG_IMAGETYPE_2D
                - SG_IMAGETYPE_CUBE
                - SG_IMAGETYPE_3D
                - SG_IMAGETYPE_ARRAY
            - the expected 'image sample type':
                - SG_IMAGESAMPLETYPE_FLOAT
                - SG_IMAGESAMPLETYPE_DEPTH
                - SG_IMAGESAMPLETYPE_SINT
                - SG_IMAGESAMPLETYPE_UINT
                - SG_IMAGESAMPLETYPE_UNFILTERABLE_FLOAT
            - a flag whether the texture is expected to be multisampled
            - a backend-specific bind slot:
                - D3D11/HLSL: the texture register N (`register(tN)`) where N is 0..31
                (in HLSL, readonly storage buffers and texture share the same bind space)
                - Metal/MSL: the texture bind slot N (`[[texture(N)]]`) where N is 0..31
                (the bind slot must not collide with storage image bindings on the same stage)
                - WebGPU/WGSL: the binding N in `@group(0) @binding(N)` where N is 0..127

        2. Storage buffer bindings with the following properties:
            - the shader stage of the storage buffer
            - a boolean 'readonly' flag, this is used for validation and hazard
            tracking in some 3D backends. Note that in render passes, only
            readonly storage buffer bindings are allowed. In compute passes, any
            read/write storage buffer binding is assumed to be written to by the
            compute shader.
            - a backend-specific bind slot:
                - D3D11/HLSL:
                    - for readonly storage buffer bindings: the texture register N
                    (`register(tN)`) where N is 0..31 (in HLSL, readonly storage
                    buffers and textures share the same bind space for
                    'shader resource views')
                    - for read/write storage buffer buffer bindings: the UAV register N
                    (`register(uN)`) where N is 0..31 (in HLSL, readwrite storage
                    buffers use their own bind space for 'unordered access views')
                - Metal/MSL: the buffer bind slot N (`[[buffer(N)]]`) where N is 8..23
                - WebGPU/WGSL: the binding N in `@group(0) @binding(N)` where N is 0..127
                - GL/GLSL: the buffer binding N in `layout(binding=N)`
                  where N is 0..sg_limits.max_storage_buffer_bindings_per_stage
            - note that storage buffer bindings are not supported on all backends
            and platforms

        3. Storage image bindings with the following properties:
            - the shader stage (*must* be compute)
            - the expected image type:
                - SG_IMAGETYPE_2D
                - SG_IMAGETYPE_CUBE
                - SG_IMAGETYPE_3D
                - SG_IMAGETYPE_ARRAY
            - the 'access pixel format', this is currently limited to:
                - SG_PIXELFORMAT_RGBA8
                - SG_PIXELFORMAT_RGBA8SN/UI/SI
                - SG_PIXELFORMAT_RGBA16UI/SI/F
                - SG_PIXELFORMAT_R32UIUI/SI/F
                - SG_PIXELFORMAT_RG32UI/SI/F
                - SG_PIXELFORMAT_RGBA32UI/SI/F
            - the access type (readwrite or writeonly)
            - a backend-specific bind slot:
                - D3D11/HLSL: the UAV register N (`register(uN)` where N is 0..31, the
                bind slot must not collide with UAV storage buffer bindings
                - Metal/MSL: the texture bind slot N (`[[texture(N)]])` where N is 0..31,
                the bind slot must not collide with other texture bindings on the same
                stage
                - WebGPU/WGSL: the binding N in `@group(1) @binding(N)` where N is 0..127
                - GL/GLSL: the buffer binding N in `layout(binding=N)`
                  where N is 0.._sg.max_storage_image_bindings_per_stage
            - note that storage image bindings are not supported on all backends and platforms

    - A description of each sampler used in the shader:
        - the shader stage of the sampler (vertex, fragment or compute)
        - the expected sampler type:
            - SG_SAMPLERTYPE_FILTERING,
            - SG_SAMPLERTYPE_NONFILTERING,
            - SG_SAMPLERTYPE_COMPARISON,
        - a backend-specific bind slot:
            - D3D11/HLSL: the sampler register N (`register(sN)`) where N is 0..SG_MAX_SAMPLER_BINDINGS
            - Metal/MSL: the sampler bind slot N (`[[sampler(N)]]`) where N is 0..SG_MAX_SAMPLER_BINDINGS
            - WebGPU/WGSL: the binding N in `@group(0) @binding(N)` where N is 0..127

    - An array of 'texture-sampler-pairs' used by the shader to sample textures,
      for D3D11, Metal and WebGPU this is used for validation purposes to check
      whether the texture and sampler are compatible with each other (especially
      WebGPU is very picky about combining the correct
      texture-sample-type with the correct sampler-type). For GLSL an
      additional 'combined-image-sampler name' must be provided because 'OpenGL
      style GLSL' cannot handle separate texture and sampler objects, but still
      groups them into a traditional GLSL 'sampler object'.

    Compatibility rules for image-sample-type vs sampler-type are as follows:

        - SG_IMAGESAMPLETYPE_FLOAT => (SG_SAMPLERTYPE_FILTERING or SG_SAMPLERTYPE_NONFILTERING)
        - SG_IMAGESAMPLETYPE_UNFILTERABLE_FLOAT => SG_SAMPLERTYPE_NONFILTERING
        - SG_IMAGESAMPLETYPE_SINT => SG_SAMPLERTYPE_NONFILTERING
        - SG_IMAGESAMPLETYPE_UINT => SG_SAMPLERTYPE_NONFILTERING
        - SG_IMAGESAMPLETYPE_DEPTH => SG_SAMPLERTYPE_COMPARISON

    Backend-specific bindslot ranges (not relevant when using sokol-shdc):

        - D3D11/HLSL:
            - separate bindslot space per shader stage
            - uniform block bindings (as cbuffer): `register(b0..b7)`
            - texture- and readonly storage buffer bindings: `register(t0..t31)`
            - read/write storage buffer and storage image bindings: `register(u0..u31)`
            - samplers: `register(s0..s11)`
        - Metal/MSL:
            - separate bindslot space per shader stage
            - uniform blocks: `[[buffer(0..7)]]`
            - storage buffers: `[[buffer(8..23)]]`
            - textures and storage image bindings: `[[texture(0..31)]]`
            - samplers: `[[sampler(0..11)]]`
        - WebGPU/WGSL:
            - common bindslot space across shader stages
            - uniform blocks: `@group(0) @binding(0..15)`
            - textures, storage-images, storage-buffers and sampler: `@group(1) @binding(0..127)`
        - GL/GLSL:
            - uniforms and image-samplers are bound by name
            - storage buffer bindings: `layout(std430, binding=0..sg_limits.max_storage_buffer_bindings_per_stage` (common
              bindslot space across shader stages)
            - storage image bindings: `layout(binding=0..sg_limits.max_storage_image_bindings_per_stage, [access_format])`

    For example code of how to create backend-specific shader objects,
    please refer to the following samples:

        - for D3D11:    https://github.com/floooh/sokol-samples/tree/master/d3d11
        - for Metal:    https://github.com/floooh/sokol-samples/tree/master/metal
        - for OpenGL:   https://github.com/floooh/sokol-samples/tree/master/glfw
        - for GLES3:    https://github.com/floooh/sokol-samples/tree/master/html5
        - for WebGPU:   https://github.com/floooh/sokol-samples/tree/master/wgpu


    ON SG_IMAGESAMPLETYPE_UNFILTERABLE_FLOAT AND SG_SAMPLERTYPE_NONFILTERING
    ========================================================================
    The WebGPU backend introduces the concept of 'unfilterable-float' textures,
    which can only be combined with 'nonfiltering' samplers (this is a restriction
    specific to WebGPU, but since the same sokol-gfx code should work across
    all backend, the sokol-gfx validation layer also enforces this restriction
    - the alternative would be undefined behaviour in some backend APIs on
    some devices).

    The background is that some mobile devices (most notably iOS devices) can
    not perform linear filtering when sampling textures with certain pixel
    formats, most notable the 32F formats:

        - SG_PIXELFORMAT_R32F
        - SG_PIXELFORMAT_RG32F
        - SG_PIXELFORMAT_RGBA32F

    The information of whether a shader is going to be used with such an
    unfilterable-float texture must already be provided in the sg_shader_desc
    struct when creating the shader (see the above section "ON SHADER CREATION").

    If you are using the sokol-shdc shader compiler, the information whether a
    texture/sampler binding expects an 'unfilterable-float/nonfiltering'
    texture/sampler combination cannot be inferred from the shader source
    alone, you'll need to provide this hint via annotation-tags. For instance
    here is an example from the ozz-skin-sapp.c sample shader which samples an
    RGBA32F texture with skinning matrices in the vertex shader:

    ```glsl
    @image_sample_type joint_tex unfilterable_float
    uniform texture2D joint_tex;
    @sampler_type smp nonfiltering
    uniform sampler smp;
    ```

    This will result in SG_IMAGESAMPLETYPE_UNFILTERABLE_FLOAT and
    SG_SAMPLERTYPE_NONFILTERING being written to the code-generated
    sg_shader_desc struct.


    ON VERTEX FORMATS
    =================
    Sokol-gfx implements the same strict mapping rules from CPU-side
    vertex component formats to GPU-side vertex input data types:

    - float and packed normalized CPU-side formats must be used as
      floating point base type in the vertex shader
    - packed signed-integer CPU-side formats must be used as signed
      integer base type in the vertex shader
    - packed unsigned-integer CPU-side formats must be used as unsigned
      integer base type in the vertex shader

    These mapping rules are enforced by the sokol-gfx validation layer,
    but only when sufficient reflection information is provided in
    `sg_shader_desc.attrs[].base_type`. This is the case when sokol-shdc
    is used, otherwise the default base_type will be SG_SHADERATTRBASETYPE_UNDEFINED
    which causes the sokol-gfx validation check to be skipped (of course you
    can also provide the per-attribute base type information manually when
    not using sokol-shdc).

    The detailed mapping rules from SG_VERTEXFORMAT_* to GLSL data types
    are as follows:

    - FLOAT[*] => float, vec*
    - BYTE4N => vec* (scaled to -1.0 .. +1.0)
    - UBYTE4N => vec* (scaled to 0.0 .. +1.0)
    - SHORT[*]N => vec* (scaled to -1.0 .. +1.0)
    - USHORT[*]N => vec* (scaled to 0.0 .. +1.0)
    - INT[*] => int, ivec*
    - UINT[*] => uint, uvec*
    - BYTE4 => int*
    - UBYTE4 => uint*
    - SHORT[*] => int*
    - USHORT[*] => uint*

    NOTE that sokol-gfx only provides vertex formats with sizes of a multiple
    of 4 (e.g. BYTE4N but not BYTE2N). This is because vertex components must
    be 4-byte aligned anyway.


    UNIFORM DATA LAYOUT:
    ====================
    NOTE: if you use the sokol-shdc shader compiler tool, you don't need to worry
    about the following details.

    The data that's passed into the sg_apply_uniforms() function must adhere to
    specific layout rules so that the GPU shader finds the uniform block
    items at the right offset.

    For the D3D11 and Metal backends, sokol-gfx only cares about the size of uniform
    blocks, but not about the internal layout. The data will just be copied into
    a uniform/constant buffer in a single operation and it's up you to arrange the
    CPU-side layout so that it matches the GPU side layout. This also means that with
    the D3D11 and Metal backends you are not limited to a 'cross-platform' subset
    of uniform variable types.

    If you ever only use one of the D3D11, Metal *or* WebGPU backend, you can stop reading here.

    For the GL backends, the internal layout of uniform blocks matters though,
    and you are limited to a small number of uniform variable types. This is
    because sokol-gfx must be able to locate the uniform block members in order
    to upload them to the GPU with glUniformXXX() calls.

    To describe the uniform block layout to sokol-gfx, the following information
    must be passed to the sg_make_shader() call in the sg_shader_desc struct:

        - a hint about the used packing rule (either SG_UNIFORMLAYOUT_NATIVE or
          SG_UNIFORMLAYOUT_STD140)
        - a list of the uniform block members types in the correct order they
          appear on the CPU side

    For example if the GLSL shader has the following uniform declarations:

        uniform mat4 mvp;
        uniform vec2 offset0;
        uniform vec2 offset1;
        uniform vec2 offset2;

    ...and on the CPU side, there's a similar C struct:

        typedef struct {
            float mvp[16];
            float offset0[2];
            float offset1[2];
            float offset2[2];
        } params_t;

    ...the uniform block description in the sg_shader_desc must look like this:

        sg_shader_desc desc = {
            .vs.uniform_blocks[0] = {
                .size = sizeof(params_t),
                .layout = SG_UNIFORMLAYOUT_NATIVE,  // this is the default and can be omitted
                .uniforms = {
                    // order must be the same as in 'params_t':
                    [0] = { .name = "mvp", .type = SG_UNIFORMTYPE_MAT4 },
                    [1] = { .name = "offset0", .type = SG_UNIFORMTYPE_VEC2 },
                    [2] = { .name = "offset1", .type = SG_UNIFORMTYPE_VEC2 },
                    [3] = { .name = "offset2", .type = SG_UNIFORMTYPE_VEC2 },
                }
            }
        };

    With this information sokol-gfx can now compute the correct offsets of the data items
    within the uniform block struct.

    The SG_UNIFORMLAYOUT_NATIVE packing rule works fine if only the GL backends are used,
    but for proper D3D11/Metal/GL a subset of the std140 layout must be used which is
    described in the next section:


    CROSS-BACKEND COMMON UNIFORM DATA LAYOUT
    ========================================
    For cross-platform / cross-3D-backend code it is important that the same uniform block
    layout on the CPU side can be used for all sokol-gfx backends. To achieve this,
    a common subset of the std140 layout must be used:

    - The uniform block layout hint in sg_shader_desc must be explicitly set to
      SG_UNIFORMLAYOUT_STD140.
    - Only the following GLSL uniform types can be used (with their associated sokol-gfx enums):
        - float => SG_UNIFORMTYPE_FLOAT
        - vec2  => SG_UNIFORMTYPE_FLOAT2
        - vec3  => SG_UNIFORMTYPE_FLOAT3
        - vec4  => SG_UNIFORMTYPE_FLOAT4
        - int   => SG_UNIFORMTYPE_INT
        - ivec2 => SG_UNIFORMTYPE_INT2
        - ivec3 => SG_UNIFORMTYPE_INT3
        - ivec4 => SG_UNIFORMTYPE_INT4
        - mat4  => SG_UNIFORMTYPE_MAT4
    - Alignment for those types must be as follows (in bytes):
        - float => 4
        - vec2  => 8
        - vec3  => 16
        - vec4  => 16
        - int   => 4
        - ivec2 => 8
        - ivec3 => 16
        - ivec4 => 16
        - mat4  => 16
    - Arrays are only allowed for the following types: vec4, int4, mat4.

    Note that the HLSL cbuffer layout rules are slightly different from the
    std140 layout rules, this means that the cbuffer declarations in HLSL code
    must be tweaked so that the layout is compatible with std140.

    The by far easiest way to tackle the common uniform block layout problem is
    to use the sokol-shdc shader cross-compiler tool!


    ON STORAGE BUFFERS
    ==================
    The two main purpose of storage buffers are:

        - to be populated by compute shaders with dynamically generated data
        - for providing random-access data to all shader stages

    Storage buffers can be used to pass large amounts of random access structured
    data from the CPU side to the shaders. They are similar to data textures, but are
    more convenient to use both on the CPU and shader side since they can be accessed
    in shaders as as a 1-dimensional array of struct items.

    Storage buffers are *NOT* supported on the following platform/backend combos:

    - macOS+GL (because storage buffers require GL 4.3, while macOS only goes up to GL 4.1)
    - platforms which only support a GLES3.0 context (WebGL2 and iOS)

    To use storage buffers, the following steps are required:

        - write a shader which uses storage buffers (vertex- and fragment-shaders
          can only read from storage buffers, while compute-shaders can both read
          and write storage buffers)
        - create one or more storage buffers via sg_make_buffer() with the
          `.usage.storage_buffer = true`
        - when creating a shader via sg_make_shader(), populate the sg_shader_desc
          struct with binding info (when using sokol-shdc, this step will be taken care
          of automatically)
            - which storage buffer bind slots on the vertex-, fragment- or compute-stage
              are occupied
            - whether the storage buffer on that bind slot is readonly (readonly
              bindings are required for vertex- and fragment-shaders, and in compute
              shaders the readonly flag is used to control hazard tracking in some
              3D backends)

        - when calling sg_apply_bindings(), apply the matching bind slots with the previously
          created storage buffers
        - ...and that's it.

    For more details, see the following backend-agnostic sokol samples:

    - simple vertex pulling from a storage buffer:
        - C code: https://github.com/floooh/sokol-samples/blob/master/sapp/vertexpull-sapp.c
        - shader: https://github.com/floooh/sokol-samples/blob/master/sapp/vertexpull-sapp.glsl
    - instanced rendering via storage buffers (vertex- and instance-pulling):
        - C code: https://github.com/floooh/sokol-samples/blob/master/sapp/instancing-pull-sapp.c
        - shader: https://github.com/floooh/sokol-samples/blob/master/sapp/instancing-pull-sapp.glsl
    - storage buffers both on the vertex- and fragment-stage:
        - C code: https://github.com/floooh/sokol-samples/blob/master/sapp/sbuftex-sapp.c
        - shader: https://github.com/floooh/sokol-samples/blob/master/sapp/sbuftex-sapp.glsl
    - the Ozz animation sample rewritten to pull all rendering data from storage buffers:
        - C code: https://github.com/floooh/sokol-samples/blob/master/sapp/ozz-storagebuffer-sapp.cc
        - shader: https://github.com/floooh/sokol-samples/blob/master/sapp/ozz-storagebuffer-sapp.glsl
    - the instancing sample modified to use compute shaders:
        - C code: https://github.com/floooh/sokol-samples/blob/master/sapp/instancing-compute-sapp.c
        - shader: https://github.com/floooh/sokol-samples/blob/master/sapp/instancing-compute-sapp.glsl
    - the Compute Boids sample ported to sokol-gfx:
        - C code: https://github.com/floooh/sokol-samples/blob/master/sapp/computeboids-sapp.c
        - shader: https://github.com/floooh/sokol-samples/blob/master/sapp/computeboids-sapp.glsl

    ...also see the following backend-specific vertex pulling samples (those also don't use sokol-shdc):

    - D3D11: https://github.com/floooh/sokol-samples/blob/master/d3d11/vertexpulling-d3d11.c
    - desktop GL: https://github.com/floooh/sokol-samples/blob/master/glfw/vertexpulling-glfw.c
    - Metal: https://github.com/floooh/sokol-samples/blob/master/metal/vertexpulling-metal.c
    - WebGPU: https://github.com/floooh/sokol-samples/blob/master/wgpu/vertexpulling-wgpu.c

    ...and the backend specific compute shader samples:

    - D3D11: https://github.com/floooh/sokol-samples/blob/master/d3d11/instancing-compute-d3d11.c
    - desktop GL: https://github.com/floooh/sokol-samples/blob/master/glfw/instancing-compute-glfw.c
    - Metal: https://github.com/floooh/sokol-samples/blob/master/metal/instancing-compute-metal.c
    - WebGPU: https://github.com/floooh/sokol-samples/blob/master/wgpu/instancing-compute-wgpu.c

    Storage buffer shader authoring caveats when using sokol-shdc:

        - declare a read-only storage buffer interface block with `layout(binding=N) readonly buffer [name] { ... }`
          (where 'N' is the index in `sg_bindings.storage_buffers[N]`)
        - ...or a read/write storage buffer interface block with `layout(binding=N) buffer [name] { ... }`
        - declare a struct which describes a single array item in the storage buffer interface block
        - only put a single flexible array member into the storage buffer interface block

    E.g. a complete example in 'sokol-shdc GLSL':

        ```glsl
        @vs
        // declare a struct:
        struct sb_vertex {
            vec3 pos;
            vec4 color;
        }
        // declare a buffer interface block with a single flexible struct array:
        layout(binding=0) readonly buffer vertices {
            sb_vertex vtx[];
        }
        // in the shader function, access the storage buffer like this:
        void main() {
            vec3 pos = vtx[gl_VertexIndex].pos;
            ...
        }
        @end
        ```

    In a compute shader you can read and write the same item in the same
    storage buffer (but you'll have to be careful for random access since
    many threads of the same compute function run in parallel):

        @cs
        struct sb_item {
            vec3 pos;
            vec3 vel;
        }
        layout(binding=0) buffer items_ssbo {
            sb_item items[];
        }
        layout(local_size_x=64, local_size_y=1, local_size_z=1) in;
        void main() {
            uint idx = gl_GlobalInvocationID.x;
            vec3 pos = items[idx].pos;
            ...
            items[idx].pos = pos;
        }
        @end

    Backend-specific storage-buffer caveats (not relevant when using sokol-shdc):

        D3D11:
            - storage buffers are created as 'raw' Byte Address Buffers
              (https://learn.microsoft.com/en-us/windows/win32/direct3d11/overviews-direct3d-11-resources-intro#raw-views-of-buffers)
            - in HLSL, use a ByteAddressBuffer for readonly access of the buffer content:
              (https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/sm5-object-byteaddressbuffer)
            - ...or RWByteAddressBuffer for read/write access:
              (https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/sm5-object-rwbyteaddressbuffer)
            - readonly-storage buffers and textures are both bound as 'shader-resource-view' and
              share the same bind slots (declared as `register(tN)` in HLSL), where N must be in the range 0..23)
            - read/write storage buffers and storage images are bound as 'unordered-access-view'
              (declared as `register(uN)` in HLSL where N is in the range 0..11)

        Metal:
            - in Metal there is no internal difference between vertex-, uniform- and
              storage-buffers, all are bound to the same 'buffer bind slots' with the
              following reserved ranges:
                - vertex shader stage:
                    - uniform buffers: slots 0..7
                    - storage buffers: slots 8..15
                    - vertex buffers: slots 15..23
                - fragment shader stage:
                    - uniform buffers: slots 0..7
                    - storage buffers: slots 8..15
            - this means in MSL, storage buffer bindings start at [[buffer(8)]] both in
              the vertex and fragment stage

        GL:
            - the GL backend doesn't use name-lookup to find storage buffer bindings, this
              means you must annotate buffers with `layout(std430, binding=N)` in GLSL
            - ...where N is 0..sg_limits.max_storage_buffer_bindings_per_stage.

        WebGPU:
            - in WGSL, textures, samplers and storage buffers all use a shared
              bindspace across all shader stages on bindgroup 1:

              `@group(1) @binding(0..127)

    ON STORAGE IMAGES:
    ==================
    To write pixel data to texture objects in compute shaders, first an image
    object must be created with `storage_image usage`:

        sg_image storage_image = sg_make_image(&(sg_image_desc){
            .usage.storage_image = true,
            },
            .width = ...,
            .height = ...,
            .pixel_format = ...,
        });

    Next a storage-image-view object is required which also allows to pick
    a specific mip-level or slice for the compute-shader to access:

        sg_view simg_view = sg_make_view(&(sg_view_desc){
            .storage_image = {
                .image = storage_image,
                .mip_level = ...,
                .slice = ...
            },
        });

    Finally 'bind' the storage-image-view via a regular sg_apply_bindings() call
    inside a compute pass:

        sg_begin_pass(&(sg_pass){ .compute = true });
        sg_apply_pipeline(...);
        sg_apply_bindings(&(sg_bindings){
            .views[VIEW_simg] = simg_view,
        });
        sg_dispatch(...);
        sg_end_pass();

    Currently, storage images can only be used with `readwrite` or `writeonly` access in
    shaders. For readonly access use a regular texture binding instead.

    For an example of using storage images in compute shaders see imageblur-sapp:

        - C code: https://github.com/floooh/sokol-samples/blob/master/sapp/imageblur-sapp.c
        - shader: https://github.com/floooh/sokol-samples/blob/master/sapp/imageblur-sapp.glsl

    TRACE HOOKS:
    ============
    sokol_gfx.h optionally allows to install "trace hook" callbacks for
    each public API functions. When a public API function is called, and
    a trace hook callback has been installed for this function, the
    callback will be invoked with the parameters and result of the function.
    This is useful for things like debugging- and profiling-tools, or
    keeping track of resource creation and destruction.

    To use the trace hook feature:

    --- Define SOKOL_TRACE_HOOKS before including the implementation.

    --- Setup an sg_trace_hooks structure with your callback function
        pointers (keep all function pointers you're not interested
        in zero-initialized), optionally set the user_data member
        in the sg_trace_hooks struct.

    --- Install the trace hooks by calling sg_install_trace_hooks(),
        the return value of this function is another sg_trace_hooks
        struct which contains the previously set of trace hooks.
        You should keep this struct around, and call those previous
        functions pointers from your own trace callbacks for proper
        chaining.

    As an example of how trace hooks are used, have a look at the
    imgui/sokol_gfx_imgui.h header which implements a realtime
    debugging UI for sokol_gfx.h on top of Dear ImGui.


    MEMORY ALLOCATION OVERRIDE
    ==========================
    You can override the memory allocation functions at initialization time
    like this:

        void* my_alloc(size_t size, void* user_data) {
            return malloc(size);
        }

        void my_free(void* ptr, void* user_data) {
            free(ptr);
        }

        ...
            sg_setup(&(sg_desc){
                // ...
                .allocator = {
                    .alloc_fn = my_alloc,
                    .free_fn = my_free,
                    .user_data = ...,
                }
            });
        ...

    If no overrides are provided, malloc and free will be used.

    This only affects memory allocation calls done by sokol_gfx.h
    itself though, not any allocations in OS libraries.


    ERROR REPORTING AND LOGGING
    ===========================
    To get any logging information at all you need to provide a logging callback in the setup call
    the easiest way is to use sokol_log.h:

        #include "sokol_log.h"

        sg_setup(&(sg_desc){ .logger.func = slog_func });

    To override logging with your own callback, first write a logging function like this:

        void my_log(const char* tag,                // e.g. 'sg'
                    uint32_t log_level,             // 0=panic, 1=error, 2=warn, 3=info
                    uint32_t log_item_id,           // SG_LOGITEM_*
                    const char* message_or_null,    // a message string, may be nullptr in release mode
                    uint32_t line_nr,               // line number in sokol_gfx.h
                    const char* filename_or_null,   // source filename, may be nullptr in release mode
                    void* user_data)
        {
            ...
        }

    ...and then setup sokol-gfx like this:

        sg_setup(&(sg_desc){
            .logger = {
                .func = my_log,
                .user_data = my_user_data,
            }
        });

    The provided logging function must be reentrant (e.g. be callable from
    different threads).

    If you don't want to provide your own custom logger it is highly recommended to use
    the standard logger in sokol_log.h instead, otherwise you won't see any warnings or
    errors.


    COMMIT LISTENERS
    ================
    It's possible to hook callback functions into sokol-gfx which are called from
    inside sg_commit() in unspecified order. This is mainly useful for libraries
    that build on top of sokol_gfx.h to be notified about the end/start of a frame.

    To add a commit listener, call:

        static void my_commit_listener(void* user_data) {
            ...
        }

        bool success = sg_add_commit_listener((sg_commit_listener){
            .func = my_commit_listener,
            .user_data = ...,
        });

    The function returns false if the internal array of commit listeners is full,
    or the same commit listener had already been added.

    If the function returns true, my_commit_listener() will be called each frame
    from inside sg_commit().

    By default, 1024 distinct commit listeners can be added, but this number
    can be tweaked in the sg_setup() call:

        sg_setup(&(sg_desc){
            .max_commit_listeners = 2048,
        });

    An sg_commit_listener item is equal to another if both the function
    pointer and user_data field are equal.

    To remove a commit listener:

        bool success = sg_remove_commit_listener((sg_commit_listener){
            .func = my_commit_listener,
            .user_data = ...,
        });

    ...where the .func and .user_data field are equal to a previous
    sg_add_commit_listener() call. The function returns true if the commit
    listener item was found and removed, and false otherwise.


    RESOURCE CREATION AND DESTRUCTION IN DETAIL
    ===========================================
    The 'vanilla' way to create resource objects is with the 'make functions':

        sg_buffer sg_make_buffer(const sg_buffer_desc* desc)
        sg_image sg_make_image(const sg_image_desc* desc)
        sg_sampler sg_make_sampler(const sg_sampler_desc* desc)
        sg_shader sg_make_shader(const sg_shader_desc* desc)
        sg_pipeline sg_make_pipeline(const sg_pipeline_desc* desc)
        sg_view sg_make_view(const sg_view_desc* desc)

    This will result in one of three cases:

        1. The returned handle is invalid. This happens when there are no more
           free slots in the resource pool for this resource type. An invalid
           handle is associated with the INVALID resource state, for instance:

                sg_buffer buf = sg_make_buffer(...)
                if (sg_query_buffer_state(buf) == SG_RESOURCESTATE_INVALID) {
                    // buffer pool is exhausted
                }

        2. The returned handle is valid, but creating the underlying resource
           has failed for some reason. This results in a resource object in the
           FAILED state. The reason *why* resource creation has failed differ
           by resource type. Look for log messages with more details. A failed
           resource state can be checked with:

                sg_buffer buf = sg_make_buffer(...)
                if (sg_query_buffer_state(buf) == SG_RESOURCESTATE_FAILED) {
                    // creating the resource has failed
                }

        3. And finally, if everything goes right, the returned resource is
           in resource state VALID and ready to use. This can be checked
           with:

                sg_buffer buf = sg_make_buffer(...)
                if (sg_query_buffer_state(buf) == SG_RESOURCESTATE_VALID) {
                    // creating the resource has failed
                }

    When calling the 'make functions', the created resource goes through a number
    of states:

        - INITIAL: the resource slot associated with the new resource is currently
          free (technically, there is no resource yet, just an empty pool slot)
        - ALLOC: a handle for the new resource has been allocated, this just means
          a pool slot has been reserved.
        - VALID or FAILED: in VALID state any 3D API backend resource objects have
          been successfully created, otherwise if anything went wrong, the resource
          will be in FAILED state.

    Sometimes it makes sense to first grab a handle, but initialize the
    underlying resource at a later time. For instance when loading data
    asynchronously from a slow data source, you may know what buffers and
    textures are needed at an early stage of the loading process, but actually
    loading the buffer or texture content can only be completed at a later time.

    For such situations, sokol-gfx resource objects can be created in two steps.
    You can allocate a handle upfront with one of the 'alloc functions':

        sg_buffer sg_alloc_buffer(void)
        sg_image sg_alloc_image(void)
        sg_sampler sg_alloc_sampler(void)
        sg_shader sg_alloc_shader(void)
        sg_pipeline sg_alloc_pipeline(void)
        sg_view sg_alloc_view(void)

    This will return a handle with the underlying resource object in the
    ALLOC state:

        sg_image img = sg_alloc_image();
        if (sg_query_image_state(img) == SG_RESOURCESTATE_ALLOC) {
            // allocating an image handle has succeeded, otherwise
            // the image pool is full
        }

    Such an 'incomplete' handle can be used in most sokol-gfx rendering functions
    without doing any harm, sokol-gfx will simply skip any rendering operation
    that involve resources which are not in VALID state.

    At a later time (for instance once the texture has completed loading
    asynchronously), the resource creation can be completed by calling one of
    the 'init functions', those functions take an existing resource handle and
    'desc struct':

        void sg_init_buffer(sg_buffer buf, const sg_buffer_desc* desc)
        void sg_init_image(sg_image img, const sg_image_desc* desc)
        void sg_init_sampler(sg_sampler smp, const sg_sampler_desc* desc)
        void sg_init_shader(sg_shader shd, const sg_shader_desc* desc)
        void sg_init_pipeline(sg_pipeline pip, const sg_pipeline_desc* desc)
        void sg_init_view(sg_view view, const sg_view_desc* desc)

    The init functions expect a resource in ALLOC state, and after the function
    returns, the resource will be either in VALID or FAILED state. Calling
    an 'alloc function' followed by the matching 'init function' is fully
    equivalent with calling the 'make function' alone.

    Destruction can also happen as a two-step process. The 'uninit functions'
    will put a resource object from the VALID or FAILED state back into the
    ALLOC state:

        void sg_uninit_buffer(sg_buffer buf)
        void sg_uninit_image(sg_image img)
        void sg_uninit_sampler(sg_sampler smp)
        void sg_uninit_shader(sg_shader shd)
        void sg_uninit_pipeline(sg_pipeline pip)
        void sg_uninit_view(sg_view view)

    Calling the 'uninit functions' with a resource that is not in the VALID or
    FAILED state is a no-op.

    To finally free the pool slot for recycling call the 'dealloc functions':

        void sg_dealloc_buffer(sg_buffer buf)
        void sg_dealloc_image(sg_image img)
        void sg_dealloc_sampler(sg_sampler smp)
        void sg_dealloc_shader(sg_shader shd)
        void sg_dealloc_pipeline(sg_pipeline pip)
        void sg_dealloc_view(sg_view view)

    Calling the 'dealloc functions' on a resource that's not in ALLOC state is
    a no-op, but will generate a warning log message.

    Calling an 'uninit function' and 'dealloc function' in sequence is equivalent
    with calling the associated 'destroy function':

        void sg_destroy_buffer(sg_buffer buf)
        void sg_destroy_image(sg_image img)
        void sg_destroy_sampler(sg_sampler smp)
        void sg_destroy_shader(sg_shader shd)
        void sg_destroy_pipeline(sg_pipeline pip)
        void sg_destroy_view(sg_view view)

    The 'destroy functions' can be called on resources in any state and generally
    do the right thing (for instance if the resource is in ALLOC state, the destroy
    function will be equivalent to the 'dealloc function' and skip the 'uninit part').

    And finally to close the circle, the 'fail functions' can be called to manually
    put a resource in ALLOC state into the FAILED state:

        sg_fail_buffer(sg_buffer buf)
        sg_fail_image(sg_image img)
        sg_fail_sampler(sg_sampler smp)
        sg_fail_shader(sg_shader shd)
        sg_fail_pipeline(sg_pipeline pip)
        sg_fail_view(sg_view view)

    This is recommended if anything went wrong outside of sokol-gfx during asynchronous
    resource setup (for instance a file loading operation failed). In this case,
    the 'fail function' should be called instead of the 'init function'.

    Calling a 'fail function' on a resource that's not in ALLOC state is a no-op,
    but will generate a warning log message.

    NOTE: that two-step resource creation usually only makes sense for buffers,
    images and views, but not for samplers, shaders or pipelines. Most notably, trying
    to create a pipeline object with a shader that's not in VALID state will
    trigger a validation layer error, or if the validation layer is disabled,
    result in a pipeline object in FAILED state.


    WEBGPU CAVEATS
    ==============
    For a general overview and design notes of the WebGPU backend see:

        https://floooh.github.io/2023/10/16/sokol-webgpu.html

    In general, don't expect an automatic speedup when switching from the WebGL2
    backend to the WebGPU backend. Some WebGPU functions currently actually
    have a higher CPU overhead than similar WebGL2 functions, leading to the
    paradoxical situation that some WebGPU code may be slower than similar WebGL2
    code.

    - when writing WGSL shader code by hand, a specific bind-slot convention
      must be used:

      All uniform block structs must use `@group(0)` and bindings in the
      range 0..15

        @group(0) @binding(0..15)

      All textures, samplers, storage-buffers and storage-images must use `@group(1)`
      and bindings must be in the range 0..127:

        @group(1) @binding(0..127)

      Note that the number of texture, sampler, storage-buffer storage-image bindings
      is still limited despite the large bind range:

        - up to 16 textures and sampler across all shader stages
        - up to 8 storage buffers across all shader stages
        - up to 4 storage images on the compute shader stage

      If you use sokol-shdc to generate WGSL shader code, you don't need to worry
      about the above binding conventions since sokol-shdc will allocate
      the WGSL bindslots).

    - The sokol-gfx WebGPU backend uses the sg_desc.uniform_buffer_size item
      to allocate a single per-frame uniform buffer which must be big enough
      to hold all data written by sg_apply_uniforms() during a single frame,
      including a worst-case 256-byte alignment (e.g. each sg_apply_uniform
      call will cost at least 256 bytes of uniform buffer size). The default size
      is 4 MB, which is enough for 16384 sg_apply_uniform() calls per
      frame (assuming the uniform data 'payload' is less than 256 bytes
      per call). These rules are the same as for the Metal backend, so if
      you are already using the Metal backend you'll be fine.

    - sg_apply_bindings(): the sokol-gfx WebGPU backend implements a bindgroup
      cache to prevent excessive creation and destruction of BindGroup objects
      when calling sg_apply_bindings(). The number of slots in the bindgroups
      cache is defined in sg_desc.wgpu.bindgroups_cache_size when calling
      sg_setup. The cache size must be a power-of-2 number, with the default being
      1024. The bindgroups cache behaviour can be observed by calling the new
      function sg_query_stats(), where the following struct items are
      of interest:

        .wgpu.num_bindgroup_cache_hits
        .wgpu.num_bindgroup_cache_misses
        .wgpu.num_bindgroup_cache_collisions
        .wgpu_num_bindgroup_cache_invalidates
        .wgpu.num_bindgroup_cache_vs_hash_key_mismatch

      The value to pay attention to is `.wgpu.num_bindgroup_cache_collisions`,
      if this number is consistently higher than a few percent of the
      .wgpu.num_set_bindgroup value, it might be a good idea to bump the
      bindgroups cache size to the next power-of-2.

    - sg_apply_viewport(): WebGPU currently has a unique restriction that viewport
      rectangles must be contained entirely within the framebuffer. As a shitty
      workaround sokol_gfx.h will clip incoming viewport rectangles against
      the framebuffer, but this will distort the clipspace-to-screenspace mapping.
      There's no proper way to handle this inside sokol_gfx.h, this must be fixed
      in a future WebGPU update (see: https://github.com/gpuweb/gpuweb/issues/373
      and https://github.com/gpuweb/gpuweb/pull/5025)

    - The sokol shader compiler generally adds `diagnostic(off, derivative_uniformity);`
      into the WGSL output. Currently only the Chrome WebGPU implementation seems
      to recognize this.

    - Likewise, the following sokol-gfx pixel formats are not supported in WebGPU:
      R16, R16SN, RG16, RG16SN, RGBA16, RGBA16SN.
      Unlike unsupported vertex formats, unsupported pixel formats can be queried
      in cross-backend code via sg_query_pixelformat() though.

    - The Emscripten WebGPU shim currently doesn't support the Closure minification
      post-link-step (e.g. currently the emcc argument '--closure 1' or '--closure 2'
      will generate broken Javascript code.

    - sokol-gfx requires the WebGPU device feature `depth32float-stencil8` to be enabled
      (this should be widely supported)

    - sokol-gfx expects that the WebGPU device feature `float32-filterable` to *not* be
      enabled (since this would exclude all iOS devices)


    LICENSE
    =======
    zlib/libpng license

    Copyright (c) 2018 Andre Weissflog

    This software is provided 'as-is', without any express or implied warranty.
    In no event will the authors be held liable for any damages arising from the
    use of this software.

    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:

        1. The origin of this software must not be misrepresented; you must not
        claim that you wrote the original software. If you use this software in a
        product, an acknowledgment in the product documentation would be
        appreciated but is not required.

        2. Altered source versions must be plainly marked as such, and must not
        be misrepresented as being the original software.

        3. This notice may not be removed or altered from any source
        distribution.

*/

import "core:c"

_ :: c

SOKOL_DEBUG :: #config(SOKOL_DEBUG, ODIN_DEBUG)

DEBUG :: #config(SOKOL_GFX_DEBUG, SOKOL_DEBUG)
USE_GL :: #config(SOKOL_USE_GL, false)
USE_DLL :: #config(SOKOL_DLL, false)

when ODIN_OS == .Windows {
    when USE_DLL {
        when USE_GL {
            when DEBUG { foreign import sokol_gfx_clib { "../sokol_dll_windows_x64_gl_debug.lib" } }
            else       { foreign import sokol_gfx_clib { "../sokol_dll_windows_x64_gl_release.lib" } }
        } else {
            when DEBUG { foreign import sokol_gfx_clib { "../sokol_dll_windows_x64_d3d11_debug.lib" } }
            else       { foreign import sokol_gfx_clib { "../sokol_dll_windows_x64_d3d11_release.lib" } }
        }
    } else {
        when USE_GL {
            when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_windows_x64_gl_debug.lib" } }
            else       { foreign import sokol_gfx_clib { "sokol_gfx_windows_x64_gl_release.lib" } }
        } else {
            when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_windows_x64_d3d11_debug.lib" } }
            else       { foreign import sokol_gfx_clib { "sokol_gfx_windows_x64_d3d11_release.lib" } }
        }
    }
} else when ODIN_OS == .Darwin {
    when USE_DLL {
             when  USE_GL && ODIN_ARCH == .arm64 &&  DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_arm64_gl_debug.dylib" } }
        else when  USE_GL && ODIN_ARCH == .arm64 && !DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_arm64_gl_release.dylib" } }
        else when  USE_GL && ODIN_ARCH == .amd64 &&  DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_x64_gl_debug.dylib" } }
        else when  USE_GL && ODIN_ARCH == .amd64 && !DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_x64_gl_release.dylib" } }
        else when !USE_GL && ODIN_ARCH == .arm64 &&  DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_arm64_metal_debug.dylib" } }
        else when !USE_GL && ODIN_ARCH == .arm64 && !DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_arm64_metal_release.dylib" } }
        else when !USE_GL && ODIN_ARCH == .amd64 &&  DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_x64_metal_debug.dylib" } }
        else when !USE_GL && ODIN_ARCH == .amd64 && !DEBUG { foreign import sokol_gfx_clib { "../dylib/sokol_dylib_macos_x64_metal_release.dylib" } }
    } else {
        when USE_GL {
            when ODIN_ARCH == .arm64 {
                when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_macos_arm64_gl_debug.a", "system:Cocoa.framework","system:QuartzCore.framework","system:OpenGL.framework" } }
                else       { foreign import sokol_gfx_clib { "sokol_gfx_macos_arm64_gl_release.a", "system:Cocoa.framework","system:QuartzCore.framework","system:OpenGL.framework" } }
            } else {
                when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_macos_x64_gl_debug.a", "system:Cocoa.framework","system:QuartzCore.framework","system:OpenGL.framework" } }
                else       { foreign import sokol_gfx_clib { "sokol_gfx_macos_x64_gl_release.a", "system:Cocoa.framework","system:QuartzCore.framework","system:OpenGL.framework" } }
            }
        } else {
            when ODIN_ARCH == .arm64 {
                when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_macos_arm64_metal_debug.a", "system:Cocoa.framework","system:QuartzCore.framework","system:Metal.framework","system:MetalKit.framework" } }
                else       { foreign import sokol_gfx_clib { "sokol_gfx_macos_arm64_metal_release.a", "system:Cocoa.framework","system:QuartzCore.framework","system:Metal.framework","system:MetalKit.framework" } }
            } else {
                when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_macos_x64_metal_debug.a", "system:Cocoa.framework","system:QuartzCore.framework","system:Metal.framework","system:MetalKit.framework" } }
                else       { foreign import sokol_gfx_clib { "sokol_gfx_macos_x64_metal_release.a", "system:Cocoa.framework","system:QuartzCore.framework","system:Metal.framework","system:MetalKit.framework" } }
            }
        }
    }
} else when ODIN_OS == .Linux {
    when USE_DLL {
        when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_linux_x64_gl_debug.so", "system:GL", "system:dl", "system:pthread" } }
        else       { foreign import sokol_gfx_clib { "sokol_gfx_linux_x64_gl_release.so", "system:GL", "system:dl", "system:pthread" } }
    } else {
        when DEBUG { foreign import sokol_gfx_clib { "sokol_gfx_linux_x64_gl_debug.a", "system:GL", "system:dl", "system:pthread" } }
        else       { foreign import sokol_gfx_clib { "sokol_gfx_linux_x64_gl_release.a", "system:GL", "system:dl", "system:pthread" } }
    }
} else when ODIN_ARCH == .wasm32 || ODIN_ARCH == .wasm64p32 {
    // Feed sokol_gfx_wasm_gl_debug.a or sokol_gfx_wasm_gl_release.a into emscripten compiler.
    foreign import sokol_gfx_clib { "env.o" }
} else {
    #panic("This OS is currently not supported")
}

@(default_calling_convention="c", link_prefix="sg_")
foreign sokol_gfx_clib {
    // setup and misc functions
    setup :: proc(#by_ptr desc: Desc)  ---
    shutdown :: proc()  ---
    isvalid :: proc() -> bool ---
    reset_state_cache :: proc()  ---
    push_debug_group :: proc(name: cstring)  ---
    pop_debug_group :: proc()  ---
    add_commit_listener :: proc(listener: Commit_Listener) -> bool ---
    remove_commit_listener :: proc(listener: Commit_Listener) -> bool ---
    // resource creation, destruction and updating
    make_buffer :: proc(#by_ptr desc: Buffer_Desc) -> Buffer ---
    make_image :: proc(#by_ptr desc: Image_Desc) -> Image ---
    make_sampler :: proc(#by_ptr desc: Sampler_Desc) -> Sampler ---
    make_shader :: proc(#by_ptr desc: Shader_Desc) -> Shader ---
    make_pipeline :: proc(#by_ptr desc: Pipeline_Desc) -> Pipeline ---
    make_view :: proc(#by_ptr desc: View_Desc) -> View ---
    destroy_buffer :: proc(buf: Buffer)  ---
    destroy_image :: proc(img: Image)  ---
    destroy_sampler :: proc(smp: Sampler)  ---
    destroy_shader :: proc(shd: Shader)  ---
    destroy_pipeline :: proc(pip: Pipeline)  ---
    destroy_view :: proc(view: View)  ---
    update_buffer :: proc(buf: Buffer, #by_ptr data: Range)  ---
    update_image :: proc(img: Image, #by_ptr data: Image_Data)  ---
    append_buffer :: proc(buf: Buffer, #by_ptr data: Range) -> c.int ---
    query_buffer_overflow :: proc(buf: Buffer) -> bool ---
    query_buffer_will_overflow :: proc(buf: Buffer, size: c.size_t) -> bool ---
    // render and compute functions
    begin_pass :: proc(#by_ptr pass: Pass)  ---
    apply_viewport :: proc(#any_int x: c.int, #any_int y: c.int, #any_int width: c.int, #any_int height: c.int, origin_top_left: bool)  ---
    apply_viewportf :: proc(x: f32, y: f32, width: f32, height: f32, origin_top_left: bool)  ---
    apply_scissor_rect :: proc(#any_int x: c.int, #any_int y: c.int, #any_int width: c.int, #any_int height: c.int, origin_top_left: bool)  ---
    apply_scissor_rectf :: proc(x: f32, y: f32, width: f32, height: f32, origin_top_left: bool)  ---
    apply_pipeline :: proc(pip: Pipeline)  ---
    apply_bindings :: proc(#by_ptr bindings: Bindings)  ---
    apply_uniforms :: proc(#any_int ub_slot: c.int, #by_ptr data: Range)  ---
    draw :: proc(#any_int base_element: c.int, #any_int num_elements: c.int, #any_int num_instances: c.int)  ---
    draw_ex :: proc(#any_int base_element: c.int, #any_int num_elements: c.int, #any_int num_instances: c.int, #any_int base_vertex: c.int, #any_int base_instance: c.int)  ---
    dispatch :: proc(#any_int num_groups_x: c.int, #any_int num_groups_y: c.int, #any_int num_groups_z: c.int)  ---
    end_pass :: proc()  ---
    commit :: proc()  ---
    // getting information
    query_desc :: proc() -> Desc ---
    query_backend :: proc() -> Backend ---
    query_features :: proc() -> Features ---
    query_limits :: proc() -> Limits ---
    query_pixelformat :: proc(fmt: Pixel_Format) -> Pixelformat_Info ---
    query_row_pitch :: proc(fmt: Pixel_Format, #any_int width: c.int, #any_int row_align_bytes: c.int) -> c.int ---
    query_surface_pitch :: proc(fmt: Pixel_Format, #any_int width: c.int, #any_int height: c.int, #any_int row_align_bytes: c.int) -> c.int ---
    // get current state of a resource (INITIAL, ALLOC, VALID, FAILED, INVALID)
    query_buffer_state :: proc(buf: Buffer) -> Resource_State ---
    query_image_state :: proc(img: Image) -> Resource_State ---
    query_sampler_state :: proc(smp: Sampler) -> Resource_State ---
    query_shader_state :: proc(shd: Shader) -> Resource_State ---
    query_pipeline_state :: proc(pip: Pipeline) -> Resource_State ---
    query_view_state :: proc(view: View) -> Resource_State ---
    // get runtime information about a resource
    query_buffer_info :: proc(buf: Buffer) -> Buffer_Info ---
    query_image_info :: proc(img: Image) -> Image_Info ---
    query_sampler_info :: proc(smp: Sampler) -> Sampler_Info ---
    query_shader_info :: proc(shd: Shader) -> Shader_Info ---
    query_pipeline_info :: proc(pip: Pipeline) -> Pipeline_Info ---
    query_view_info :: proc(view: View) -> View_Info ---
    // get desc structs matching a specific resource (NOTE that not all creation attributes may be provided)
    query_buffer_desc :: proc(buf: Buffer) -> Buffer_Desc ---
    query_image_desc :: proc(img: Image) -> Image_Desc ---
    query_sampler_desc :: proc(smp: Sampler) -> Sampler_Desc ---
    query_shader_desc :: proc(shd: Shader) -> Shader_Desc ---
    query_pipeline_desc :: proc(pip: Pipeline) -> Pipeline_Desc ---
    query_view_desc :: proc(view: View) -> View_Desc ---
    // get resource creation desc struct with their default values replaced
    query_buffer_defaults :: proc(#by_ptr desc: Buffer_Desc) -> Buffer_Desc ---
    query_image_defaults :: proc(#by_ptr desc: Image_Desc) -> Image_Desc ---
    query_sampler_defaults :: proc(#by_ptr desc: Sampler_Desc) -> Sampler_Desc ---
    query_shader_defaults :: proc(#by_ptr desc: Shader_Desc) -> Shader_Desc ---
    query_pipeline_defaults :: proc(#by_ptr desc: Pipeline_Desc) -> Pipeline_Desc ---
    query_view_defaults :: proc(#by_ptr desc: View_Desc) -> View_Desc ---
    // assorted query functions
    query_buffer_size :: proc(buf: Buffer) -> c.size_t ---
    query_buffer_usage :: proc(buf: Buffer) -> Buffer_Usage ---
    query_image_type :: proc(img: Image) -> Image_Type ---
    query_image_width :: proc(img: Image) -> c.int ---
    query_image_height :: proc(img: Image) -> c.int ---
    query_image_num_slices :: proc(img: Image) -> c.int ---
    query_image_num_mipmaps :: proc(img: Image) -> c.int ---
    query_image_pixelformat :: proc(img: Image) -> Pixel_Format ---
    query_image_usage :: proc(img: Image) -> Image_Usage ---
    query_image_sample_count :: proc(img: Image) -> c.int ---
    query_view_type :: proc(view: View) -> View_Type ---
    query_view_image :: proc(view: View) -> Image ---
    query_view_buffer :: proc(view: View) -> Buffer ---
    // separate resource allocation and initialization (for async setup)
    alloc_buffer :: proc() -> Buffer ---
    alloc_image :: proc() -> Image ---
    alloc_sampler :: proc() -> Sampler ---
    alloc_shader :: proc() -> Shader ---
    alloc_pipeline :: proc() -> Pipeline ---
    alloc_view :: proc() -> View ---
    dealloc_buffer :: proc(buf: Buffer)  ---
    dealloc_image :: proc(img: Image)  ---
    dealloc_sampler :: proc(smp: Sampler)  ---
    dealloc_shader :: proc(shd: Shader)  ---
    dealloc_pipeline :: proc(pip: Pipeline)  ---
    dealloc_view :: proc(view: View)  ---
    init_buffer :: proc(buf: Buffer, #by_ptr desc: Buffer_Desc)  ---
    init_image :: proc(img: Image, #by_ptr desc: Image_Desc)  ---
    init_sampler :: proc(smg: Sampler, #by_ptr desc: Sampler_Desc)  ---
    init_shader :: proc(shd: Shader, #by_ptr desc: Shader_Desc)  ---
    init_pipeline :: proc(pip: Pipeline, #by_ptr desc: Pipeline_Desc)  ---
    init_view :: proc(view: View, #by_ptr desc: View_Desc)  ---
    uninit_buffer :: proc(buf: Buffer)  ---
    uninit_image :: proc(img: Image)  ---
    uninit_sampler :: proc(smp: Sampler)  ---
    uninit_shader :: proc(shd: Shader)  ---
    uninit_pipeline :: proc(pip: Pipeline)  ---
    uninit_view :: proc(view: View)  ---
    fail_buffer :: proc(buf: Buffer)  ---
    fail_image :: proc(img: Image)  ---
    fail_sampler :: proc(smp: Sampler)  ---
    fail_shader :: proc(shd: Shader)  ---
    fail_pipeline :: proc(pip: Pipeline)  ---
    fail_view :: proc(view: View)  ---
    // frame and total stats
    enable_stats :: proc()  ---
    disable_stats :: proc()  ---
    stats_enabled :: proc() -> bool ---
    query_stats :: proc() -> Stats ---
    // D3D11: return ID3D11Device
    d3d11_device :: proc() -> rawptr ---
    // D3D11: return ID3D11DeviceContext
    d3d11_device_context :: proc() -> rawptr ---
    // D3D11: get internal buffer resource objects
    d3d11_query_buffer_info :: proc(buf: Buffer) -> D3d11_Buffer_Info ---
    // D3D11: get internal image resource objects
    d3d11_query_image_info :: proc(img: Image) -> D3d11_Image_Info ---
    // D3D11: get internal sampler resource objects
    d3d11_query_sampler_info :: proc(smp: Sampler) -> D3d11_Sampler_Info ---
    // D3D11: get internal shader resource objects
    d3d11_query_shader_info :: proc(shd: Shader) -> D3d11_Shader_Info ---
    // D3D11: get internal pipeline resource objects
    d3d11_query_pipeline_info :: proc(pip: Pipeline) -> D3d11_Pipeline_Info ---
    // D3D11: get internal view resource objects
    d3d11_query_view_info :: proc(view: View) -> D3d11_View_Info ---
    // Metal: return __bridge-casted MTLDevice
    mtl_device :: proc() -> rawptr ---
    // Metal: return __bridge-casted MTLRenderCommandEncoder when inside render pass (otherwise zero)
    mtl_render_command_encoder :: proc() -> rawptr ---
    // Metal: return __bridge-casted MTLComputeCommandEncoder when inside compute pass (otherwise zero)
    mtl_compute_command_encoder :: proc() -> rawptr ---
    // Metal: get internal __bridge-casted buffer resource objects
    mtl_query_buffer_info :: proc(buf: Buffer) -> Mtl_Buffer_Info ---
    // Metal: get internal __bridge-casted image resource objects
    mtl_query_image_info :: proc(img: Image) -> Mtl_Image_Info ---
    // Metal: get internal __bridge-casted sampler resource objects
    mtl_query_sampler_info :: proc(smp: Sampler) -> Mtl_Sampler_Info ---
    // Metal: get internal __bridge-casted shader resource objects
    mtl_query_shader_info :: proc(shd: Shader) -> Mtl_Shader_Info ---
    // Metal: get internal __bridge-casted pipeline resource objects
    mtl_query_pipeline_info :: proc(pip: Pipeline) -> Mtl_Pipeline_Info ---
    // WebGPU: return WGPUDevice object
    wgpu_device :: proc() -> rawptr ---
    // WebGPU: return WGPUQueue object
    wgpu_queue :: proc() -> rawptr ---
    // WebGPU: return this frame's WGPUCommandEncoder
    wgpu_command_encoder :: proc() -> rawptr ---
    // WebGPU: return WGPURenderPassEncoder of current pass (returns 0 when outside pass or in a compute pass)
    wgpu_render_pass_encoder :: proc() -> rawptr ---
    // WebGPU: return WGPUComputePassEncoder of current pass (returns 0 when outside pass or in a render pass)
    wgpu_compute_pass_encoder :: proc() -> rawptr ---
    // WebGPU: get internal buffer resource objects
    wgpu_query_buffer_info :: proc(buf: Buffer) -> Wgpu_Buffer_Info ---
    // WebGPU: get internal image resource objects
    wgpu_query_image_info :: proc(img: Image) -> Wgpu_Image_Info ---
    // WebGPU: get internal sampler resource objects
    wgpu_query_sampler_info :: proc(smp: Sampler) -> Wgpu_Sampler_Info ---
    // WebGPU: get internal shader resource objects
    wgpu_query_shader_info :: proc(shd: Shader) -> Wgpu_Shader_Info ---
    // WebGPU: get internal pipeline resource objects
    wgpu_query_pipeline_info :: proc(pip: Pipeline) -> Wgpu_Pipeline_Info ---
    // WebGPU: get internal view resource objects
    wgpu_query_view_info :: proc(view: View) -> Wgpu_View_Info ---
    // GL: get internal buffer resource objects
    gl_query_buffer_info :: proc(buf: Buffer) -> Gl_Buffer_Info ---
    // GL: get internal image resource objects
    gl_query_image_info :: proc(img: Image) -> Gl_Image_Info ---
    // GL: get internal sampler resource objects
    gl_query_sampler_info :: proc(smp: Sampler) -> Gl_Sampler_Info ---
    // GL: get internal shader resource objects
    gl_query_shader_info :: proc(shd: Shader) -> Gl_Shader_Info ---
    // GL: get internal view resource objects
    gl_query_view_info :: proc(view: View) -> Gl_View_Info ---
}

/*
    Resource id typedefs:

    sg_buffer:      vertex- and index-buffers
    sg_image:       images used as textures and render-pass attachments
    sg_sampler      sampler objects describing how a texture is sampled in a shader
    sg_shader:      vertex- and fragment-shaders and shader interface information
    sg_pipeline:    associated shader and vertex-layouts, and render states
    sg_view:        a resource view object used for bindings and render-pass attachments

    Instead of pointers, resource creation functions return a 32-bit
    handle which uniquely identifies the resource object.

    The 32-bit resource id is split into a 16-bit pool index in the lower bits,
    and a 16-bit 'generation counter' in the upper bits. The index allows fast
    pool lookups, and combined with the generation-counter it allows to detect
    'dangling accesses' (trying to use an object which no longer exists, and
    its pool slot has been reused for a new object)

    The resource ids are wrapped into a strongly-typed struct so that
    trying to pass an incompatible resource id is a compile error.
*/
Buffer :: struct {
    id : u32,
}

Image :: struct {
    id : u32,
}

Sampler :: struct {
    id : u32,
}

Shader :: struct {
    id : u32,
}

Pipeline :: struct {
    id : u32,
}

View :: struct {
    id : u32,
}

/*
    sg_range is a pointer-size-pair struct used to pass memory blobs into
    sokol-gfx. When initialized from a value type (array or struct), you can
    use the SG_RANGE() macro to build an sg_range struct. For functions which
    take either a sg_range pointer, or a (C++) sg_range reference, use the
    SG_RANGE_REF macro as a solution which compiles both in C and C++.
*/
Range :: struct {
    ptr : rawptr,
    size : c.size_t,
}

// various compile-time constants in the public API
INVALID_ID :: 0
NUM_INFLIGHT_FRAMES :: 2
MAX_COLOR_ATTACHMENTS :: 8
MAX_UNIFORMBLOCK_MEMBERS :: 16
MAX_VERTEX_ATTRIBUTES :: 16
MAX_MIPMAPS :: 16
MAX_VERTEXBUFFER_BINDSLOTS :: 8
MAX_UNIFORMBLOCK_BINDSLOTS :: 8
MAX_VIEW_BINDSLOTS :: 32
MAX_SAMPLER_BINDSLOTS :: 12
MAX_TEXTURE_SAMPLER_PAIRS :: 32
MAX_PORTABLE_COLOR_ATTACHMENTS :: 4
MAX_PORTABLE_TEXTURE_BINDINGS_PER_STAGE :: 16
MAX_PORTABLE_STORAGEBUFFER_BINDINGS_PER_STAGE :: 8
MAX_PORTABLE_STORAGEIMAGE_BINDINGS_PER_STAGE :: 4

/*
    sg_color

    An RGBA color value.
*/
Color :: struct {
    r : f32,
    g : f32,
    b : f32,
    a : f32,
}

/*
    sg_backend

    The active 3D-API backend, use the function sg_query_backend()
    to get the currently active backend.
*/
Backend :: enum i32 {
    GLCORE,
    GLES3,
    D3D11,
    METAL_IOS,
    METAL_MACOS,
    METAL_SIMULATOR,
    WGPU,
    VULKAN,
    DUMMY,
}

/*
    sg_pixel_format

    sokol_gfx.h basically uses the same pixel formats as WebGPU, since these
    are supported on most newer GPUs.

    A pixelformat name consist of three parts:

        - components (R, RG, RGB or RGBA)
        - bit width per component (8, 16 or 32)
        - component data type:
            - unsigned normalized (no postfix)
            - signed normalized (SN postfix)
            - unsigned integer (UI postfix)
            - signed integer (SI postfix)
            - float (F postfix)

    Not all pixel formats can be used for everything, call sg_query_pixelformat()
    to inspect the capabilities of a given pixelformat. The function returns
    an sg_pixelformat_info struct with the following members:

        - sample: the pixelformat can be sampled as texture at least with
                  nearest filtering
        - filter: the pixelformat can be sampled as texture with linear
                  filtering
        - render: the pixelformat can be used as render-pass attachment
        - blend:  blending is supported when used as render-pass attachment
        - msaa:   multisample-antialiasing is supported when used
                  as render-pass attachment
        - depth:  the pixelformat can be used for depth-stencil attachments
        - compressed: this is a block-compressed format
        - bytes_per_pixel: the numbers of bytes in a pixel (0 for compressed formats)

    The default pixel format for texture images is SG_PIXELFORMAT_RGBA8.

    The default pixel format for render target images is platform-dependent
    and taken from the sg_environment struct passed into sg_setup(). Typically
    the default formats are:

        - for the Metal, D3D11 and WebGPU backends: SG_PIXELFORMAT_BGRA8
        - for GL backends: SG_PIXELFORMAT_RGBA8
*/
Pixel_Format :: enum i32 {
    DEFAULT,
    NONE,
    R8,
    R8SN,
    R8UI,
    R8SI,
    R16,
    R16SN,
    R16UI,
    R16SI,
    R16F,
    RG8,
    RG8SN,
    RG8UI,
    RG8SI,
    R32UI,
    R32SI,
    R32F,
    RG16,
    RG16SN,
    RG16UI,
    RG16SI,
    RG16F,
    RGBA8,
    SRGB8A8,
    RGBA8SN,
    RGBA8UI,
    RGBA8SI,
    BGRA8,
    RGB10A2,
    RG11B10F,
    RGB9E5,
    RG32UI,
    RG32SI,
    RG32F,
    RGBA16,
    RGBA16SN,
    RGBA16UI,
    RGBA16SI,
    RGBA16F,
    RGBA32UI,
    RGBA32SI,
    RGBA32F,
    DEPTH,
    DEPTH_STENCIL,
    BC1_RGBA,
    BC2_RGBA,
    BC3_RGBA,
    BC3_SRGBA,
    BC4_R,
    BC4_RSN,
    BC5_RG,
    BC5_RGSN,
    BC6H_RGBF,
    BC6H_RGBUF,
    BC7_RGBA,
    BC7_SRGBA,
    ETC2_RGB8,
    ETC2_SRGB8,
    ETC2_RGB8A1,
    ETC2_RGBA8,
    ETC2_SRGB8A8,
    EAC_R11,
    EAC_R11SN,
    EAC_RG11,
    EAC_RG11SN,
    ASTC_4x4_RGBA,
    ASTC_4x4_SRGBA,
}

// Runtime information about a pixel format, returned by sg_query_pixelformat().
Pixelformat_Info :: struct {
    sample : bool,
    filter : bool,
    render : bool,
    blend : bool,
    msaa : bool,
    depth : bool,
    compressed : bool,
    read : bool,
    write : bool,
    bytes_per_pixel : c.int,
}

// Runtime information about available optional features, returned by sg_query_features()
Features :: struct {
    origin_top_left : bool,
    image_clamp_to_border : bool,
    mrt_independent_blend_state : bool,
    mrt_independent_write_mask : bool,
    compute : bool,
    msaa_texture_bindings : bool,
    separate_buffer_types : bool,
    draw_base_vertex : bool,
    draw_base_instance : bool,
    gl_texture_views : bool,
}

// Runtime information about resource limits, returned by sg_query_limit()
Limits :: struct {
    max_image_size_2d : c.int,
    max_image_size_cube : c.int,
    max_image_size_3d : c.int,
    max_image_size_array : c.int,
    max_image_array_layers : c.int,
    max_vertex_attrs : c.int,
    max_color_attachments : c.int,
    max_texture_bindings_per_stage : c.int,
    max_storage_buffer_bindings_per_stage : c.int,
    max_storage_image_bindings_per_stage : c.int,
    gl_max_vertex_uniform_components : c.int,
    gl_max_combined_texture_image_units : c.int,
    d3d11_max_unordered_access_views : c.int,
    vk_min_uniform_buffer_offset_alignment : c.int,
}

/*
    sg_resource_state

    The current state of a resource in its resource pool.
    Resources start in the INITIAL state, which means the
    pool slot is unoccupied and can be allocated. When a resource is
    created, first an id is allocated, and the resource pool slot
    is set to state ALLOC. After allocation, the resource is
    initialized, which may result in the VALID or FAILED state. The
    reason why allocation and initialization are separate is because
    some resource types (e.g. buffers and images) might be asynchronously
    initialized by the user application. If a resource which is not
    in the VALID state is attempted to be used for rendering, rendering
    operations will silently be dropped.

    The special INVALID state is returned in sg_query_xxx_state() if no
    resource object exists for the provided resource id.
*/
Resource_State :: enum i32 {
    INITIAL,
    ALLOC,
    VALID,
    FAILED,
    INVALID,
}

/*
    sg_index_type

    Indicates whether indexed rendering (fetching vertex-indices from an
    index buffer) is used, and if yes, the index data type (16- or 32-bits).

    This is used in the sg_pipeline_desc.index_type member when creating a
    pipeline object.

    The default index type is SG_INDEXTYPE_NONE.
*/
Index_Type :: enum i32 {
    DEFAULT,
    NONE,
    UINT16,
    UINT32,
}

/*
    sg_image_type

    Indicates the basic type of an image object (2D-texture, cubemap,
    3D-texture or 2D-array-texture). Used in the sg_image_desc.type member when
    creating an image, and in sg_shader_image_desc to describe a sampled texture
    in the shader (both must match and will be checked in the validation layer
    when calling sg_apply_bindings).

    The default image type when creating an image is SG_IMAGETYPE_2D.
*/
Image_Type :: enum i32 {
    DEFAULT,
    _2D,
    CUBE,
    _3D,
    ARRAY,
}

/*
    sg_image_sample_type

    The basic data type of a texture sample as expected by a shader.
    Must be provided in sg_shader_image and used by the validation
    layer in sg_apply_bindings() to check if the provided image object
    is compatible with what the shader expects. Apart from the sokol-gfx
    validation layer, WebGPU is the only backend API which actually requires
    matching texture and sampler type to be provided upfront for validation
    (other 3D APIs treat texture/sampler type mismatches as undefined behaviour).

    NOTE that the following texture pixel formats require the use
    of SG_IMAGESAMPLETYPE_UNFILTERABLE_FLOAT, combined with a sampler
    of type SG_SAMPLERTYPE_NONFILTERING:

    - SG_PIXELFORMAT_R32F
    - SG_PIXELFORMAT_RG32F
    - SG_PIXELFORMAT_RGBA32F

    (when using sokol-shdc, also check out the meta tags `@image_sample_type`
    and `@sampler_type`)
*/
Image_Sample_Type :: enum i32 {
    DEFAULT,
    FLOAT,
    DEPTH,
    SINT,
    UINT,
    UNFILTERABLE_FLOAT,
}

/*
    sg_sampler_type

    The basic type of a texture sampler (sampling vs comparison) as
    defined in a shader. Must be provided in sg_shader_sampler_desc.

    sg_image_sample_type and sg_sampler_type for a texture/sampler
    pair must be compatible with each other, specifically only
    the following pairs are allowed:

    - SG_IMAGESAMPLETYPE_FLOAT => (SG_SAMPLERTYPE_FILTERING or SG_SAMPLERTYPE_NONFILTERING)
    - SG_IMAGESAMPLETYPE_UNFILTERABLE_FLOAT => SG_SAMPLERTYPE_NONFILTERING
    - SG_IMAGESAMPLETYPE_SINT => SG_SAMPLERTYPE_NONFILTERING
    - SG_IMAGESAMPLETYPE_UINT => SG_SAMPLERTYPE_NONFILTERING
    - SG_IMAGESAMPLETYPE_DEPTH => SG_SAMPLERTYPE_COMPARISON
*/
Sampler_Type :: enum i32 {
    DEFAULT,
    FILTERING,
    NONFILTERING,
    COMPARISON,
}

/*
    sg_primitive_type

    This is the common subset of 3D primitive types supported across all 3D
    APIs. This is used in the sg_pipeline_desc.primitive_type member when
    creating a pipeline object.

    The default primitive type is SG_PRIMITIVETYPE_TRIANGLES.
*/
Primitive_Type :: enum i32 {
    DEFAULT,
    POINTS,
    LINES,
    LINE_STRIP,
    TRIANGLES,
    TRIANGLE_STRIP,
}

/*
    sg_filter

    The filtering mode when sampling a texture image. This is
    used in the sg_sampler_desc.min_filter, sg_sampler_desc.mag_filter
    and sg_sampler_desc.mipmap_filter members when creating a sampler object.

    For the default is SG_FILTER_NEAREST.
*/
Filter :: enum i32 {
    DEFAULT,
    NEAREST,
    LINEAR,
}

/*
    sg_wrap

    The texture coordinates wrapping mode when sampling a texture
    image. This is used in the sg_image_desc.wrap_u, .wrap_v
    and .wrap_w members when creating an image.

    The default wrap mode is SG_WRAP_REPEAT.

    NOTE: SG_WRAP_CLAMP_TO_BORDER is not supported on all backends
    and platforms. To check for support, call sg_query_features()
    and check the "clamp_to_border" boolean in the returned
    sg_features struct.

    Platforms which don't support SG_WRAP_CLAMP_TO_BORDER will silently fall back
    to SG_WRAP_CLAMP_TO_EDGE without a validation error.
*/
Wrap :: enum i32 {
    DEFAULT,
    REPEAT,
    CLAMP_TO_EDGE,
    CLAMP_TO_BORDER,
    MIRRORED_REPEAT,
}

/*
    sg_border_color

    The border color to use when sampling a texture, and the UV wrap
    mode is SG_WRAP_CLAMP_TO_BORDER.

    The default border color is SG_BORDERCOLOR_OPAQUE_BLACK
*/
Border_Color :: enum i32 {
    DEFAULT,
    TRANSPARENT_BLACK,
    OPAQUE_BLACK,
    OPAQUE_WHITE,
}

/*
    sg_vertex_format

    The data type of a vertex component. This is used to describe
    the layout of input vertex data when creating a pipeline object.

    NOTE that specific mapping rules exist from the CPU-side vertex
    formats to the vertex attribute base type in the vertex shader code
    (see doc header section 'ON VERTEX FORMATS').
*/
Vertex_Format :: enum i32 {
    INVALID,
    FLOAT,
    FLOAT2,
    FLOAT3,
    FLOAT4,
    INT,
    INT2,
    INT3,
    INT4,
    UINT,
    UINT2,
    UINT3,
    UINT4,
    BYTE4,
    BYTE4N,
    UBYTE4,
    UBYTE4N,
    SHORT2,
    SHORT2N,
    USHORT2,
    USHORT2N,
    SHORT4,
    SHORT4N,
    USHORT4,
    USHORT4N,
    UINT10_N2,
    HALF2,
    HALF4,
}

/*
    sg_vertex_step

    Defines whether the input pointer of a vertex input stream is advanced
    'per vertex' or 'per instance'. The default step-func is
    SG_VERTEXSTEP_PER_VERTEX. SG_VERTEXSTEP_PER_INSTANCE is used with
    instanced-rendering.

    The vertex-step is part of the vertex-layout definition
    when creating pipeline objects.
*/
Vertex_Step :: enum i32 {
    DEFAULT,
    PER_VERTEX,
    PER_INSTANCE,
}

/*
    sg_uniform_type

    The data type of a uniform block member. This is used to
    describe the internal layout of uniform blocks when creating
    a shader object. This is only required for the GL backend, all
    other backends will ignore the interior layout of uniform blocks.
*/
Uniform_Type :: enum i32 {
    INVALID,
    FLOAT,
    FLOAT2,
    FLOAT3,
    FLOAT4,
    INT,
    INT2,
    INT3,
    INT4,
    MAT4,
}

/*
    sg_uniform_layout

    A hint for the interior memory layout of uniform blocks. This is
    only relevant for the GL backend where the internal layout
    of uniform blocks must be known to sokol-gfx. For all other backends the
    internal memory layout of uniform blocks doesn't matter, sokol-gfx
    will just pass uniform data as an opaque memory blob to the
    3D backend.

    SG_UNIFORMLAYOUT_NATIVE (default)
        Native layout means that a 'backend-native' memory layout
        is used. For the GL backend this means that uniforms
        are packed tightly in memory (e.g. there are no padding
        bytes).

    SG_UNIFORMLAYOUT_STD140
        The memory layout is a subset of std140. Arrays are only
        allowed for the FLOAT4, INT4 and MAT4. Alignment is as
        is as follows:

            FLOAT, INT:         4 byte alignment
            FLOAT2, INT2:       8 byte alignment
            FLOAT3, INT3:       16 byte alignment(!)
            FLOAT4, INT4:       16 byte alignment
            MAT4:               16 byte alignment
            FLOAT4[], INT4[]:   16 byte alignment

        The overall size of the uniform block must be a multiple
        of 16.

    For more information search for 'UNIFORM DATA LAYOUT' in the documentation block
    at the start of the header.
*/
Uniform_Layout :: enum i32 {
    DEFAULT,
    NATIVE,
    STD140,
}

/*
    sg_cull_mode

    The face-culling mode, this is used in the
    sg_pipeline_desc.cull_mode member when creating a
    pipeline object.

    The default cull mode is SG_CULLMODE_NONE
*/
Cull_Mode :: enum i32 {
    DEFAULT,
    NONE,
    FRONT,
    BACK,
}

/*
    sg_face_winding

    The vertex-winding rule that determines a front-facing primitive. This
    is used in the member sg_pipeline_desc.face_winding
    when creating a pipeline object.

    The default winding is SG_FACEWINDING_CW (clockwise)
*/
Face_Winding :: enum i32 {
    DEFAULT,
    CCW,
    CW,
}

/*
    sg_compare_func

    The compare-function for configuring depth- and stencil-ref tests
    in pipeline objects, and for texture samplers which perform a comparison
    instead of regular sampling operation.

    Used in the following structs:

    sg_pipeline_desc
        .depth
            .compare
        .stencil
            .front.compare
            .back.compare

    sg_sampler_desc
        .compare

    The default compare func for depth- and stencil-tests is
    SG_COMPAREFUNC_ALWAYS.

    The default compare func for samplers is SG_COMPAREFUNC_NEVER.
*/
Compare_Func :: enum i32 {
    DEFAULT,
    NEVER,
    LESS,
    EQUAL,
    LESS_EQUAL,
    GREATER,
    NOT_EQUAL,
    GREATER_EQUAL,
    ALWAYS,
}

/*
    sg_stencil_op

    The operation performed on a currently stored stencil-value when a
    comparison test passes or fails. This is used when creating a pipeline
    object in the following sg_pipeline_desc struct items:

    sg_pipeline_desc
        .stencil
            .front
                .fail_op
                .depth_fail_op
                .pass_op
            .back
                .fail_op
                .depth_fail_op
                .pass_op

    The default value is SG_STENCILOP_KEEP.
*/
Stencil_Op :: enum i32 {
    DEFAULT,
    KEEP,
    ZERO,
    REPLACE,
    INCR_CLAMP,
    DECR_CLAMP,
    INVERT,
    INCR_WRAP,
    DECR_WRAP,
}

/*
    sg_blend_factor

    The source and destination factors in blending operations.
    This is used in the following members when creating a pipeline object:

    sg_pipeline_desc
        .colors[i]
            .blend
                .src_factor_rgb
                .dst_factor_rgb
                .src_factor_alpha
                .dst_factor_alpha

    The default value is SG_BLENDFACTOR_ONE for source
    factors, and for the destination SG_BLENDFACTOR_ZERO if the associated
    blend-op is ADD, SUBTRACT or REVERSE_SUBTRACT or SG_BLENDFACTOR_ONE
    if the associated blend-op is MIN or MAX.
*/
Blend_Factor :: enum i32 {
    DEFAULT,
    ZERO,
    ONE,
    SRC_COLOR,
    ONE_MINUS_SRC_COLOR,
    SRC_ALPHA,
    ONE_MINUS_SRC_ALPHA,
    DST_COLOR,
    ONE_MINUS_DST_COLOR,
    DST_ALPHA,
    ONE_MINUS_DST_ALPHA,
    SRC_ALPHA_SATURATED,
    BLEND_COLOR,
    ONE_MINUS_BLEND_COLOR,
    BLEND_ALPHA,
    ONE_MINUS_BLEND_ALPHA,
}

/*
    sg_blend_op

    Describes how the source and destination values are combined in the
    fragment blending operation. It is used in the following struct items
    when creating a pipeline object:

    sg_pipeline_desc
        .colors[i]
            .blend
                .op_rgb
                .op_alpha

    The default value is SG_BLENDOP_ADD.
*/
Blend_Op :: enum i32 {
    DEFAULT,
    ADD,
    SUBTRACT,
    REVERSE_SUBTRACT,
    MIN,
    MAX,
}

/*
    sg_color_mask

    Selects the active color channels when writing a fragment color to the
    framebuffer. This is used in the members
    sg_pipeline_desc.colors[i].write_mask when creating a pipeline object.

    The default colormask is SG_COLORMASK_RGBA (write all colors channels)

    NOTE: since the color mask value 0 is reserved for the default value
    (SG_COLORMASK_RGBA), use SG_COLORMASK_NONE if all color channels
    should be disabled.
*/
Color_Mask :: enum i32 {
    DEFAULT = 0,
    NONE = 16,
    R = 1,
    G = 2,
    RG = 3,
    B = 4,
    RB = 5,
    GB = 6,
    RGB = 7,
    A = 8,
    RA = 9,
    GA = 10,
    RGA = 11,
    BA = 12,
    RBA = 13,
    GBA = 14,
    RGBA = 15,
}

/*
    sg_load_action

    Defines the load action that should be performed at the start of a render pass:

    SG_LOADACTION_CLEAR:        clear the render target
    SG_LOADACTION_LOAD:         load the previous content of the render target
    SG_LOADACTION_DONTCARE:     leave the render target in an undefined state

    This is used in the sg_pass_action structure.

    The default load action for all pass attachments is SG_LOADACTION_CLEAR,
    with the values rgba = { 0.5f, 0.5f, 0.5f, 1.0f }, depth=1.0f and stencil=0.

    If you want to override the default behaviour, it is important to not
    only set the clear color, but the 'action' field as well (as long as this
    is _SG_LOADACTION_DEFAULT, the value fields will be ignored).
*/
Load_Action :: enum i32 {
    DEFAULT,
    CLEAR,
    LOAD,
    DONTCARE,
}

/*
    sg_store_action

    Defines the store action that should be performed at the end of a render pass:

    SG_STOREACTION_STORE:       store the rendered content to the color attachment image
    SG_STOREACTION_DONTCARE:    allows the GPU to discard the rendered content
*/
Store_Action :: enum i32 {
    DEFAULT,
    STORE,
    DONTCARE,
}

/*
    sg_pass_action

    The sg_pass_action struct defines the actions to be performed
    at the start and end of a render pass.

    - at the start of the pass: whether the render attachments should be cleared,
      loaded with their previous content, or start in an undefined state
    - for clear operations: the clear value (color, depth, or stencil values)
    - at the end of the pass: whether the rendering result should be
      stored back into the render attachment or discarded
*/
Color_Attachment_Action :: struct {
    load_action : Load_Action,
    store_action : Store_Action,
    clear_value : Color,
}

Depth_Attachment_Action :: struct {
    load_action : Load_Action,
    store_action : Store_Action,
    clear_value : f32,
}

Stencil_Attachment_Action :: struct {
    load_action : Load_Action,
    store_action : Store_Action,
    clear_value : u8,
}

Pass_Action :: struct {
    colors : [8]Color_Attachment_Action,
    depth : Depth_Attachment_Action,
    stencil : Stencil_Attachment_Action,
}

/*
    sg_swapchain

    Used in sg_begin_pass() to provide details about an external swapchain
    (pixel formats, sample count and backend-API specific render surface objects).

    The following information must be provided:

    - the width and height of the swapchain surfaces in number of pixels,
    - the pixel format of the render- and optional msaa-resolve-surface
    - the pixel format of the optional depth- or depth-stencil-surface
    - the MSAA sample count for the render and depth-stencil surface

    If the pixel formats and MSAA sample counts are left zero-initialized,
    their defaults are taken from the sg_environment struct provided in the
    sg_setup() call.

    The width and height *must* be > 0.

    Additionally the following backend API specific objects must be passed in
    as 'type erased' void pointers:

    GL:
        - on all GL backends, a GL framebuffer object must be provided. This
          can be zero for the default framebuffer.

    D3D11:
        - an ID3D11RenderTargetView for the rendering surface, without
          MSAA rendering this surface will also be displayed
        - an optional ID3D11DepthStencilView for the depth- or depth/stencil
          buffer surface
        - when MSAA rendering is used, another ID3D11RenderTargetView
          which serves as MSAA resolve target and will be displayed

    WebGPU (same as D3D11, except different types)
        - a WGPUTextureView for the rendering surface, without
          MSAA rendering this surface will also be displayed
        - an optional WGPUTextureView for the depth- or depth/stencil
          buffer surface
        - when MSAA rendering is used, another WGPUTextureView
          which serves as MSAA resolve target and will be displayed

    Metal (NOTE that the roles of provided surfaces is slightly different
    than on D3D11 or WebGPU in case of MSAA vs non-MSAA rendering):

        - A current CAMetalDrawable (NOT an MTLDrawable!) which will be presented.
          This will either be rendered to directly (if no MSAA is used), or serve
          as MSAA-resolve target.
        - an optional MTLTexture for the depth- or depth-stencil buffer
        - an optional multisampled MTLTexture which serves as intermediate
          rendering surface which will then be resolved into the
          CAMetalDrawable.

    NOTE that for Metal you must use an ObjC __bridge cast to
    properly tunnel the ObjC object id through a C void*, e.g.:

        swapchain.metal.current_drawable = (__bridge const void*) [mtkView currentDrawable];

    On all other backends you shouldn't need to mess with the reference count.

    It's a good practice to write a helper function which returns an initialized
    sg_swapchain struct, which can then be plugged directly into
    sg_pass.swapchain. Look at the function sglue_swapchain() in the sokol_glue.h
    as an example.
*/
Metal_Swapchain :: struct {
    current_drawable : rawptr,
    depth_stencil_texture : rawptr,
    msaa_color_texture : rawptr,
}

D3d11_Swapchain :: struct {
    render_view : rawptr,
    resolve_view : rawptr,
    depth_stencil_view : rawptr,
}

Wgpu_Swapchain :: struct {
    render_view : rawptr,
    resolve_view : rawptr,
    depth_stencil_view : rawptr,
}

Vulkan_Swapchain :: struct {
    render_image : rawptr,
    render_view : rawptr,
    resolve_image : rawptr,
    resolve_view : rawptr,
    depth_stencil_image : rawptr,
    depth_stencil_view : rawptr,
    render_finished_semaphore : rawptr,
    present_complete_semaphore : rawptr,
}

Gl_Swapchain :: struct {
    framebuffer : u32,
}

Swapchain :: struct {
    width : c.int,
    height : c.int,
    sample_count : c.int,
    color_format : Pixel_Format,
    depth_format : Pixel_Format,
    metal : Metal_Swapchain,
    d3d11 : D3d11_Swapchain,
    wgpu : Wgpu_Swapchain,
    vulkan : Vulkan_Swapchain,
    gl : Gl_Swapchain,
}

/*
    sg_attachments

    Used in sg_pass to provide render pass attachment views. Each
    type of pass attachment has it corresponding view type:

    sg_attachments.colors[]:
        populate with color-attachment views, e.g.:

        sg_make_view(&(sg_view_desc){
            .color_attachment = { ... },
        });

    sg_attachments.resolves[]:
        populate with resolve-attachment views, e.g.:

        sg_make_view(&(sg_view_desc){
            .resolve_attachment = { ... },
        });

    sg_attachments.depth_stencil:
        populate with depth-stencil-attachment views, e.g.:

        sg_make_view(&(sg_view_desc){
            .depth_stencil_attachment = { ... },
        });
*/
Attachments :: struct {
    colors : [8]View,
    resolves : [8]View,
    depth_stencil : View,
}

/*
    sg_pass

    The sg_pass structure is passed as argument into the sg_begin_pass()
    function.

    For a swapchain render pass, provide an sg_pass_action and sg_swapchain
    struct (for instance via the sglue_swapchain() helper function from
    sokol_glue.h):

        sg_begin_pass(&(sg_pass){
            .action = { ... },
            .swapchain = sglue_swapchain(),
        });

    For an offscreen render pass, provide an sg_pass_action struct with
    attachment view objects:

        sg_begin_pass(&(sg_pass){
            .action = { ... },
            .attachments = {
                .colors = { ... },
                .resolves = { ... },
                .depth_stencil = ...,
            },
        });

    You can also omit the .action object to get default pass action behaviour
    (clear to color=grey, depth=1 and stencil=0).

    For a compute pass, just set the sg_pass.compute boolean to true:

        sg_begin_pass(&(sg_pass){ .compute = true });
*/
Pass :: struct {
    _ : u32,
    compute : bool,
    action : Pass_Action,
    attachments : Attachments,
    swapchain : Swapchain,
    label : cstring,
    _ : u32,
}

/*
    sg_bindings

    The sg_bindings structure defines the resource bindings for
    the next draw call.

    To update the resource bindings, call sg_apply_bindings() with
    a pointer to a populated sg_bindings struct. Note that
    sg_apply_bindings() must be called after sg_apply_pipeline()
    and that bindings are not preserved across sg_apply_pipeline()
    calls, even when the new pipeline uses the same 'bindings layout'.

    A resource binding struct contains:

    - 1..N vertex buffers
    - 1..N vertex buffer offsets
    - 0..1 index buffer
    - 0..1 index buffer offset
    - 0..N resource views (texture-, storage-image, storage-buffer-views)
    - 0..N samplers

    Where 'N' is defined in the following constants:

    - SG_MAX_VERTEXBUFFER_BINDSLOTS
    - SG_MAX_VIEW_BINDSLOTS
    - SG_MAX_SAMPLER_BINDSLOTS

    Note that inside compute passes vertex- and index-buffer-bindings are
    disallowed.

    When using sokol-shdc for shader authoring, the `layout(binding=N)`
    for texture-, storage-image- and storage-buffer-bindings directly
    maps to the views-array index, for instance the following vertex-
    and fragment-shader interface for sokol-shdc:

        @vs vs
        layout(binding=0) uniform vs_params { ... };
        layout(binding=0) readonly buffer ssbo { ... };
        layout(binding=1) uniform texture2D vs_tex;
        layout(binding=0) uniform sampler vs_smp;
        ...
        @end

        @fs fs
        layout(binding=1) uniform fs_params { ... };
        layout(binding=2) uniform texture2D fs_tex;
        layout(binding=1) uniform sampler fs_smp;
        ...
        @end

    ...would map to the following sg_bindings struct:

        const sg_bindings bnd = {
            .vertex_buffers[0] = ...,
            .views[0] = ssbo_view,
            .views[1] = vs_tex_view,
            .views[2] = fs_tex_view,
            .samplers[0] = vs_smp,
            .samplers[1] = fs_smp,
        };

    ...alternatively you can use code-generated slot indices:

        const sg_bindings bnd = {
            .vertex_buffers[0] = ...,
            .views[VIEW_ssbo] = ssbo_view,
            .views[VIEW_vs_tex] = vs_tex_view,
            .views[VIEW_fs_tex] = fs_tex_view,
            .samplers[SMP_vs_smp] = vs_smp,
            .samplers[SMP_fs_smp] = fs_smp,
        };

    Resource bindslots for a specific shader/pipeline may have gaps, and an
    sg_bindings struct may have populated bind slots which are not used by a
    specific shader. This allows to use the same sg_bindings struct across
    different shader variants.

    When not using sokol-shdc, the bindslot indices in the sg_bindings
    struct need to match the per-binding reflection info slot indices
    in the sg_shader_desc struct (for details about that see the
    sg_shader_desc struct documentation).

    The optional buffer offsets can be used to put different unrelated
    chunks of vertex- and/or index-data into the same buffer objects.
*/
Bindings :: struct {
    _ : u32,
    vertex_buffers : [8]Buffer,
    vertex_buffer_offsets : [8]c.int,
    index_buffer : Buffer,
    index_buffer_offset : c.int,
    views : [32]View,
    samplers : [12]Sampler,
    _ : u32,
}

/*
    sg_buffer_usage

    Describes how a buffer object is going to be used:

    .vertex_buffer (default: true)
        the buffer will be bound as vertex buffer via sg_bindings.vertex_buffers[]
    .index_buffer (default: false)
        the buffer will be bound as index buffer via sg_bindings.index_buffer
    .storage_buffer (default: false)
        the buffer will be bound as storage buffer via storage-buffer-view
        in sg_bindings.views[]
    .immutable (default: true)
        the buffer content will never be updated from the CPU side (but
        may be written to by a compute shader)
    .dynamic_update (default: false)
        the buffer content will be infrequently updated from the CPU side
    .stream_upate (default: false)
        the buffer content will be updated each frame from the CPU side
*/
Buffer_Usage :: struct {
    vertex_buffer : bool,
    index_buffer : bool,
    storage_buffer : bool,
    immutable : bool,
    dynamic_update : bool,
    stream_update : bool,
}

/*
    sg_buffer_desc

    Creation parameters for sg_buffer objects, used in the sg_make_buffer() call.

    The default configuration is:

    .size:      0       (*must* be >0 for buffers without data)
    .usage      { .vertex_buffer = true, .immutable = true }
    .data.ptr   0       (*must* be valid for immutable buffers without storage buffer usage)
    .data.size  0       (*must* be > 0 for immutable buffers without storage buffer usage)
    .label      0       (optional string label)

    For immutable buffers which are initialized with initial data,
    keep the .size item zero-initialized, and set the size together with the
    pointer to the initial data in the .data item.

    For immutable or mutable buffers without initial data, keep the .data item
    zero-initialized, and set the buffer size in the .size item instead.

    You can also set both size values, but currently both size values must
    be identical (this may change in the future when the dynamic resource
    management may become more flexible).

    NOTE: Immutable buffers without storage-buffer-usage *must* be created
    with initial content, this restriction doesn't apply to storage buffer usage,
    because storage buffers may also get their initial content by running
    a compute shader on them.

    NOTE: Buffers without initial data will have undefined content, e.g.
    do *not* expect the buffer to be zero-initialized!

    ADVANCED TOPIC: Injecting native 3D-API buffers:

    The following struct members allow to inject your own GL, Metal
    or D3D11 buffers into sokol_gfx:

    .gl_buffers[SG_NUM_INFLIGHT_FRAMES]
    .mtl_buffers[SG_NUM_INFLIGHT_FRAMES]
    .d3d11_buffer

    You must still provide all other struct items except the .data item, and
    these must match the creation parameters of the native buffers you provide.
    For sg_buffer_desc.usage.immutable buffers, only provide a single native
    3D-API buffer, otherwise you need to provide SG_NUM_INFLIGHT_FRAMES buffers
    (only for GL and Metal, not D3D11). Providing multiple buffers for GL and
    Metal is necessary because sokol_gfx will rotate through them when calling
    sg_update_buffer() to prevent lock-stalls.

    Note that it is expected that immutable injected buffer have already been
    initialized with content, and the .content member must be 0!

    Also you need to call sg_reset_state_cache() after calling native 3D-API
    functions, and before calling any sokol_gfx function.
*/
Buffer_Desc :: struct {
    _ : u32,
    size : c.size_t,
    usage : Buffer_Usage,
    data : Range,
    label : cstring,
    gl_buffers : [2]u32,
    mtl_buffers : [2]rawptr,
    d3d11_buffer : rawptr,
    wgpu_buffer : rawptr,
    _ : u32,
}

/*
    sg_image_usage

    Describes the intended usage of an image object:

    .storage_image (default: false)
        the image can be used as parent resource of a storage-image-view,
        which allows compute shaders to write to the image in a compute
        pass (for read-only access in compute shaders bind the image
        via a texture view instead
    .color_attachment (default: false)
        the image can be used as parent resource of a color-attachment-view,
        which is then passed into sg_begin_pass via sg_pass.attachments.colors[]
        so that fragment shaders can render into the image
    .resolve_attachment (default: false)
        the image can be used as parent resource of a resolve-attachment-view,
        which is then passed into sg_begin_pass via sg_pass.attachments.resolves[]
        as target for an MSAA-resolve operation in sg_end_pass()
    .depth_stencil_attachment (default: false)
        the image can be used as parent resource of a depth-stencil-attachmnet-view
        which is then passes into sg_begin_pass via sg_pass.attachments.depth_stencil
        as depth-stencil-buffer
    .immutable (default: true)
        the image content cannot be updated from the CPU side
        (but may be updated by the GPU in a render- or compute-pass)
    .dynamic_update (default: false)
        the image content is updated infrequently by the CPU
    .stream_update (default: false)
        the image content is updated each frame by the CPU via

    Note that creating a texture view from the image to be used for
    texture-sampling in vertex-, fragment- or compute-shaders
    is always implicitly allowed.
*/
Image_Usage :: struct {
    storage_image : bool,
    color_attachment : bool,
    resolve_attachment : bool,
    depth_stencil_attachment : bool,
    immutable : bool,
    dynamic_update : bool,
    stream_update : bool,
}

/*
    sg_view_type

    Allows to query the type of a view object via the function sg_query_view_type()
*/
View_Type :: enum i32 {
    INVALID,
    STORAGEBUFFER,
    STORAGEIMAGE,
    TEXTURE,
    COLORATTACHMENT,
    RESOLVEATTACHMENT,
    DEPTHSTENCILATTACHMENT,
}

/*
    sg_image_data

    Defines the content of an image through an array of sg_range structs, each
    range pointing to the pixel data for one mip-level. For array-, cubemap- and
    3D-images each mip-level contains all slice-surfaces for that mip-level in a
    single tightly packed memory block.

    The size of a single surface in a mip-level for a regular 2D texture
    can be computed via:

        sg_query_surface_pitch(pixel_format, mip_width, mip_height, 1);

    For array- and 3d-images the size of a single miplevel is:

        num_slices * sg_query_surface_pitch(pixel_format, mip_width, mip_height, 1);

    For cubemap-images the size of a single mip-level is:

        6 * sg_query_surface_pitch(pixel_format, mip_width, mip_height, 1);

    The order of cubemap-faces is in a mip-level data chunk is:

        [0] => +X
        [1] => -X
        [2] => +Y
        [3] => -Y
        [4] => +Z
        [5] => -Z
*/
Image_Data :: struct {
    mip_levels : [16]Range,
}

/*
    sg_image_desc

    Creation parameters for sg_image objects, used in the sg_make_image() call.

    The default configuration is:

    .type               SG_IMAGETYPE_2D
    .usage              .immutable = true
    .width              0 (must be set to >0)
    .height             0 (must be set to >0)
    .num_slices         1 (3D textures: depth; array textures: number of layers)
    .num_mipmaps        1
    .pixel_format       SG_PIXELFORMAT_RGBA8 for textures, or sg_desc.environment.defaults.color_format for render targets
    .sample_count       1 for textures, or sg_desc.environment.defaults.sample_count for render targets
    .data               an sg_image_data struct to define the initial content
    .label              0 (optional string label for trace hooks)

    Q: Why is the default sample_count for render targets identical with the
    "default sample count" from sg_desc.environment.defaults.sample_count?

    A: So that it matches the default sample count in pipeline objects. Even
    though it is a bit strange/confusing that offscreen render targets by default
    get the same sample count as 'default swapchains', but it's better that
    an offscreen render target created with default parameters matches
    a pipeline object created with default parameters.

    NOTE:

    Regular images used as texture binding with usage.immutable must be fully
    initialized by providing a valid .data member which points to initialization
    data.

    Images with usage.*_attachment or usage.storage_image must
    *not* be created with initial content. Be aware that the initial
    content of pass attachment and storage images is undefined
    (not guaranteed to be zeroed).

    ADVANCED TOPIC: Injecting native 3D-API textures:

    The following struct members allow to inject your own GL, Metal or D3D11
    textures into sokol_gfx:

    .gl_textures[SG_NUM_INFLIGHT_FRAMES]
    .mtl_textures[SG_NUM_INFLIGHT_FRAMES]
    .d3d11_texture
    .wgpu_texture

    For GL, you can also specify the texture target or leave it empty to use
    the default texture target for the image type (GL_TEXTURE_2D for
    SG_IMAGETYPE_2D etc)

    The same rules apply as for injecting native buffers (see sg_buffer_desc
    documentation for more details).
*/
Image_Desc :: struct {
    _ : u32,
    type : Image_Type,
    usage : Image_Usage,
    width : c.int,
    height : c.int,
    num_slices : c.int,
    num_mipmaps : c.int,
    pixel_format : Pixel_Format,
    sample_count : c.int,
    data : Image_Data,
    label : cstring,
    gl_textures : [2]u32,
    gl_texture_target : u32,
    mtl_textures : [2]rawptr,
    d3d11_texture : rawptr,
    wgpu_texture : rawptr,
    _ : u32,
}

/*
    sg_sampler_desc

    Creation parameters for sg_sampler objects, used in the sg_make_sampler() call

    .min_filter:        SG_FILTER_NEAREST
    .mag_filter:        SG_FILTER_NEAREST
    .mipmap_filter      SG_FILTER_NEAREST
    .wrap_u:            SG_WRAP_REPEAT
    .wrap_v:            SG_WRAP_REPEAT
    .wrap_w:            SG_WRAP_REPEAT (only SG_IMAGETYPE_3D)
    .min_lod            0.0f
    .max_lod            FLT_MAX
    .border_color       SG_BORDERCOLOR_OPAQUE_BLACK
    .compare            SG_COMPAREFUNC_NEVER
    .max_anisotropy     1 (must be 1..16)
*/
Sampler_Desc :: struct {
    _ : u32,
    min_filter : Filter,
    mag_filter : Filter,
    mipmap_filter : Filter,
    wrap_u : Wrap,
    wrap_v : Wrap,
    wrap_w : Wrap,
    min_lod : f32,
    max_lod : f32,
    border_color : Border_Color,
    compare : Compare_Func,
    max_anisotropy : u32,
    label : cstring,
    gl_sampler : u32,
    mtl_sampler : rawptr,
    d3d11_sampler : rawptr,
    wgpu_sampler : rawptr,
    _ : u32,
}

/*
    sg_shader_desc

    Used as parameter of sg_make_shader() to create a shader object which
    communicates shader source or bytecode and shader interface
    reflection information to sokol-gfx.

    If you use sokol-shdc you can ignore the following information since
    the sg_shader_desc struct will be code-generated.

    Otherwise you need to provide the following information to the
    sg_make_shader() call:

    - a vertex- and fragment-shader function:
        - the shader source or bytecode
        - an optional entry point name
        - for D3D11: an optional compile target when source code is provided
          (the defaults are "vs_4_0" and "ps_4_0")

    - ...or alternatively, a compute function:
        - the shader source or bytecode
        - an optional entry point name
        - for D3D11: an optional compile target when source code is provided
          (the default is "cs_5_0")

    - vertex attributes required by some backends (not for compute shaders):
        - the vertex attribute base type (undefined, float, signed int, unsigned int),
          this information is only used in the validation layer to check that the
          pipeline object vertex formats are compatible with the input vertex attribute
          type used in the vertex shader. NOTE that the default base type
          'undefined' skips the validation layer check.
        - for the GL backend: optional vertex attribute names used for name lookup
        - for the D3D11 backend: semantic names and indices

    - only for compute shaders on the Metal backend:
        - the workgroup size aka 'threads per thread-group'

          In other 3D APIs this is declared in the shader code:
            - GLSL: `layout(local_size_x=x, local_size_y=y, local_size_y=z) in;`
            - HLSL: `[numthreads(x, y, z)]`
            - WGSL: `@workgroup_size(x, y, z)`
          ...but in Metal the workgroup size is declared on the CPU side

    - reflection information for each uniform block binding used by the shader:
        - the shader stage the uniform block appears in (SG_SHADERSTAGE_*)
        - the size in bytes of the uniform block
        - backend-specific bindslots:
            - HLSL: the constant buffer register `register(b0..7)`
            - MSL: the buffer attribute `[[buffer(0..7)]]`
            - WGSL: the binding in `@group(0) @binding(0..15)`
        - GLSL only: a description of the uniform block interior
            - the memory layout standard (SG_UNIFORMLAYOUT_*)
            - for each member in the uniform block:
                - the member type (SG_UNIFORM_*)
                - if the member is an array, the array count
                - the member name

    - reflection information for each texture-, storage-buffer and
      storage-image bindings by the shader, each with an associated
      view type:
        - texture bindings => texture views
        - storage-buffer bindings => storage-buffer views
        - storage-image bindings => storage-image views

    - texture bindings must provide the following information:
        - the shader stage the texture binding appears in (SG_SHADERSTAGE_*)
        - the image type (SG_IMAGETYPE_*)
        - the image-sample type (SG_IMAGESAMPLETYPE_*)
        - whether the texture is multisampled
        - backend specific bindslots:
            - HLSL: the texture register `register(t0..31)`
            - MSL: the texture attribute `[[texture(0..31)]]`
            - WGSL: the binding in `@group(1) @binding(0..127)`

    - storage-buffer bindings must provide the following information:
        - the shader stage the storage buffer appears in (SG_SHADERSTAGE_*)
        - whether the storage buffer is readonly
        - backend specific bindslots:
            - HLSL:
                - for storage buffer bindings: `register(t0..31)`
                - for read/write storage buffer bindings: `register(u0..31)`
            - MSL: the buffer attribute `[[buffer(8..23)]]`
            - WGSL: the binding in `@group(1) @binding(0..127)`
            - GL: the binding in `layout(binding=0..sg_limits.max_storage_buffer_bindings_per_stage)`

    - storage-image bindings must provide the following information:
        - the shader stage (*must* be SG_SHADERSTAGE_COMPUTE)
        - whether the storage image is writeonly or readwrite (for readonly
          access use a regular texture binding instead)
        - the image type expected by the shader (SG_IMAGETYPE_*)
        - the access pixel format expected by the shader (SG_PIXELFORMAT_*),
          note that only a subset of pixel formats is allowed for storage image
          bindings
        - backend specific bindslots:
            - HLSL: the UAV register `register(u0..31)`
            - MSL: the texture attribute `[[texture(0..31)]]`
            - WGSL: the binding in `@group(1) @binding(0..127)`
            - GLSL: the binding in `layout(binding=0..sg_imits.max_storage_buffer_bindings_per_stage, [access_format])`

    - reflection information for each sampler used by the shader:
        - the shader stage the sampler appears in (SG_SHADERSTAGE_*)
        - the sampler type (SG_SAMPLERTYPE_*)
        - backend specific bindslots:
            - HLSL: the sampler register `register(s0..11)`
            - MSL: the sampler attribute `[[sampler(0..11)]]`
            - WGSL: the binding in `@group(0) @binding(0..127)`

    - reflection information for each texture-sampler pair used by
      the shader:
        - the shader stage (SG_SHADERSTAGE_*)
        - the texture's array index in the sg_shader_desc.views[] array
        - the sampler's array index in the sg_shader_desc.samplers[] array
        - GLSL only: the name of the combined image-sampler object

    The number and order of items in the sg_shader_desc.attrs[]
    array corresponds to the items in sg_pipeline_desc.layout.attrs.

        - sg_shader_desc.attrs[N] => sg_pipeline_desc.layout.attrs[N]

    NOTE that vertex attribute indices currently cannot have gaps.

    The items index in the sg_shader_desc.uniform_blocks[] array corresponds
    to the ub_slot arg in sg_apply_uniforms():

        - sg_shader_desc.uniform_blocks[N] => sg_apply_uniforms(N, ...)

    The items in the sg_shader_desc.views[] array directly map to
    the views in the sg_bindings.views[] array!

    For all GL backends, shader source-code must be provided. For D3D11 and Metal,
    either shader source-code or byte-code can be provided.

    NOTE that the uniform-block, view and sampler arrays may have gaps. This
    allows to use the same sg_bindings struct for different but related
    shader variations.

    For D3D11, if source code is provided, the d3dcompiler_47.dll will be loaded
    on demand. If this fails, shader creation will fail. When compiling HLSL
    source code, you can provide an optional target string via
    sg_shader_stage_desc.d3d11_target, the default target is "vs_4_0" for the
    vertex shader stage and "ps_4_0" for the pixel shader stage.
    You may optionally provide the file path to enable the default #include handler
    behavior when compiling source code.
*/
Shader_Stage :: enum i32 {
    NONE,
    VERTEX,
    FRAGMENT,
    COMPUTE,
}

Shader_Function :: struct {
    source : cstring,
    bytecode : Range,
    entry : cstring,
    d3d11_target : cstring,
    d3d11_filepath : cstring,
}

Shader_Attr_Base_Type :: enum i32 {
    UNDEFINED,
    FLOAT,
    SINT,
    UINT,
}

Shader_Vertex_Attr :: struct {
    base_type : Shader_Attr_Base_Type,
    glsl_name : cstring,
    hlsl_sem_name : cstring,
    hlsl_sem_index : u8,
}

Glsl_Shader_Uniform :: struct {
    type : Uniform_Type,
    array_count : u16,
    glsl_name : cstring,
}

Shader_Uniform_Block :: struct {
    stage : Shader_Stage,
    size : u32,
    hlsl_register_b_n : u8,
    msl_buffer_n : u8,
    wgsl_group0_binding_n : u8,
    spirv_set0_binding_n : u8,
    layout : Uniform_Layout,
    glsl_uniforms : [16]Glsl_Shader_Uniform,
}

Shader_Texture_View :: struct {
    stage : Shader_Stage,
    image_type : Image_Type,
    sample_type : Image_Sample_Type,
    multisampled : bool,
    hlsl_register_t_n : u8,
    msl_texture_n : u8,
    wgsl_group1_binding_n : u8,
    spirv_set1_binding_n : u8,
}

Shader_Storage_Buffer_View :: struct {
    stage : Shader_Stage,
    readonly : bool,
    hlsl_register_t_n : u8,
    hlsl_register_u_n : u8,
    msl_buffer_n : u8,
    wgsl_group1_binding_n : u8,
    spirv_set1_binding_n : u8,
    glsl_binding_n : u8,
}

Shader_Storage_Image_View :: struct {
    stage : Shader_Stage,
    image_type : Image_Type,
    access_format : Pixel_Format,
    writeonly : bool,
    hlsl_register_u_n : u8,
    msl_texture_n : u8,
    wgsl_group1_binding_n : u8,
    spirv_set1_binding_n : u8,
    glsl_binding_n : u8,
}

Shader_View :: struct {
    texture : Shader_Texture_View,
    storage_buffer : Shader_Storage_Buffer_View,
    storage_image : Shader_Storage_Image_View,
}

Shader_Sampler :: struct {
    stage : Shader_Stage,
    sampler_type : Sampler_Type,
    hlsl_register_s_n : u8,
    msl_sampler_n : u8,
    wgsl_group1_binding_n : u8,
    spirv_set1_binding_n : u8,
}

Shader_Texture_Sampler_Pair :: struct {
    stage : Shader_Stage,
    view_slot : u8,
    sampler_slot : u8,
    glsl_name : cstring,
}

Mtl_Shader_Threads_Per_Threadgroup :: struct {
    x : c.int,
    y : c.int,
    z : c.int,
}

Shader_Desc :: struct {
    _ : u32,
    vertex_func : Shader_Function,
    fragment_func : Shader_Function,
    compute_func : Shader_Function,
    attrs : [16]Shader_Vertex_Attr,
    uniform_blocks : [8]Shader_Uniform_Block,
    views : [32]Shader_View,
    samplers : [12]Shader_Sampler,
    texture_sampler_pairs : [32]Shader_Texture_Sampler_Pair,
    mtl_threads_per_threadgroup : Mtl_Shader_Threads_Per_Threadgroup,
    label : cstring,
    _ : u32,
}

/*
    sg_pipeline_desc

    The sg_pipeline_desc struct defines all creation parameters for an
    sg_pipeline object, used as argument to the sg_make_pipeline() function:

    Pipeline objects come in two flavours:

    - render pipelines for use in render passes
    - compute pipelines for use in compute passes

    A compute pipeline only requires a compute shader object but no
    'render state', while a render pipeline requires a vertex/fragment shader
    object and additional render state declarations:

    - the vertex layout for all input vertex buffers
    - a shader object
    - the 3D primitive type (points, lines, triangles, ...)
    - the index type (none, 16- or 32-bit)
    - all the fixed-function-pipeline state (depth-, stencil-, blend-state, etc...)

    If the vertex data has no gaps between vertex components, you can omit
    the .layout.buffers[].stride and layout.attrs[].offset items (leave them
    default-initialized to 0), sokol-gfx will then compute the offsets and
    strides from the vertex component formats (.layout.attrs[].format).
    Please note that ALL vertex attribute offsets must be 0 in order for the
    automatic offset computation to kick in.

    Note that if you use vertex-pulling from storage buffers instead of
    fixed-function vertex input you can simply omit the entire nested .layout
    struct.

    The default configuration is as follows:

    .compute:               false (must be set to true for a compute pipeline)
    .shader:                0 (must be initialized with a valid sg_shader id!)
    .layout:
        .buffers[]:         vertex buffer layouts
            .stride:        0 (if no stride is given it will be computed)
            .step_func      SG_VERTEXSTEP_PER_VERTEX
            .step_rate      1
        .attrs[]:           vertex attribute declarations
            .buffer_index   0 the vertex buffer bind slot
            .offset         0 (offsets can be omitted if the vertex layout has no gaps)
            .format         SG_VERTEXFORMAT_INVALID (must be initialized!)
    .depth:
        .pixel_format:      sg_desc.context.depth_format
        .compare:           SG_COMPAREFUNC_ALWAYS
        .write_enabled:     false
        .bias:              0.0f
        .bias_slope_scale:  0.0f
        .bias_clamp:        0.0f
    .stencil:
        .enabled:           false
        .front/back:
            .compare:       SG_COMPAREFUNC_ALWAYS
            .fail_op:       SG_STENCILOP_KEEP
            .depth_fail_op: SG_STENCILOP_KEEP
            .pass_op:       SG_STENCILOP_KEEP
        .read_mask:         0
        .write_mask:        0
        .ref:               0
    .color_count            1
    .colors[0..color_count]
        .pixel_format       sg_desc.context.color_format
        .write_mask:        SG_COLORMASK_RGBA
        .blend:
            .enabled:           false
            .src_factor_rgb:    SG_BLENDFACTOR_ONE
            .dst_factor_rgb:    SG_BLENDFACTOR_ZERO
            .op_rgb:            SG_BLENDOP_ADD
            .src_factor_alpha:  SG_BLENDFACTOR_ONE
            .dst_factor_alpha:  SG_BLENDFACTOR_ZERO
            .op_alpha:          SG_BLENDOP_ADD
    .primitive_type:            SG_PRIMITIVETYPE_TRIANGLES
    .index_type:                SG_INDEXTYPE_NONE
    .cull_mode:                 SG_CULLMODE_NONE
    .face_winding:              SG_FACEWINDING_CW
    .sample_count:              sg_desc.context.sample_count
    .blend_color:               (sg_color) { 0.0f, 0.0f, 0.0f, 0.0f }
    .alpha_to_coverage_enabled: false
    .label  0       (optional string label for trace hooks)
*/
Vertex_Buffer_Layout_State :: struct {
    stride : c.int,
    step_func : Vertex_Step,
    step_rate : c.int,
}

Vertex_Attr_State :: struct {
    buffer_index : c.int,
    offset : c.int,
    format : Vertex_Format,
}

Vertex_Layout_State :: struct {
    buffers : [8]Vertex_Buffer_Layout_State,
    attrs : [16]Vertex_Attr_State,
}

Stencil_Face_State :: struct {
    compare : Compare_Func,
    fail_op : Stencil_Op,
    depth_fail_op : Stencil_Op,
    pass_op : Stencil_Op,
}

Stencil_State :: struct {
    enabled : bool,
    front : Stencil_Face_State,
    back : Stencil_Face_State,
    read_mask : u8,
    write_mask : u8,
    ref : u8,
}

Depth_State :: struct {
    pixel_format : Pixel_Format,
    compare : Compare_Func,
    write_enabled : bool,
    bias : f32,
    bias_slope_scale : f32,
    bias_clamp : f32,
}

Blend_State :: struct {
    enabled : bool,
    src_factor_rgb : Blend_Factor,
    dst_factor_rgb : Blend_Factor,
    op_rgb : Blend_Op,
    src_factor_alpha : Blend_Factor,
    dst_factor_alpha : Blend_Factor,
    op_alpha : Blend_Op,
}

Color_Target_State :: struct {
    pixel_format : Pixel_Format,
    write_mask : Color_Mask,
    blend : Blend_State,
}

Pipeline_Desc :: struct {
    _ : u32,
    compute : bool,
    shader : Shader,
    layout : Vertex_Layout_State,
    depth : Depth_State,
    stencil : Stencil_State,
    color_count : c.int,
    colors : [8]Color_Target_State,
    primitive_type : Primitive_Type,
    index_type : Index_Type,
    cull_mode : Cull_Mode,
    face_winding : Face_Winding,
    sample_count : c.int,
    blend_color : Color,
    alpha_to_coverage_enabled : bool,
    label : cstring,
    _ : u32,
}

/*
    sg_view_desc

    Creation params for sg_view objects, passed into sg_make_view() calls.

    View objects are passed into sg_apply_bindings() (for texture-, storage-buffer-
    and storage-image views), and sg_begin_pass() (for color-, resolve-
    and depth-stencil-attachment views).

    The view type is determined by initializing one of the sub-structs of
    sg_view_desc:

    .texture            a texture-view object will be created
        .image          the sg_image parent resource
        .mip_levels     optional mip-level range, keep zero-initialized for the
                        entire mipmap chain
            .base       the first mip level
            .count      number of mip levels, keeping this zero-initialized means
                        'all remaining mip levels'
        .slices         optional slice range, keep zero-initialized to include
                        all slices
            .base       the first slice
            .count      number of slices, keeping this zero-initializied means 'all remaining slices'

    .storage_buffer     a storage-buffer-view object will be created
        .buffer         the sg_buffer parent resource, must have been created
                        with `sg_buffer_desc.usage.storage_buffer = true`
        .offset         optional 256-byte aligned byte-offset into the buffer

    .storage_image      a storage-image-view object will be created
        .image          the sg_image parent resource, must have been created
                        with `sg_image_desc.usage.storage_image = true`
        .mip_level      selects the mip-level for the compute shader to write
        .slice          selects the slice for the compute shader to write

    .color_attachment   a color-attachment-view object will be created
        .image          the sg_image parent resource, must have been created
                        with `sg_image_desc.usage.color_attachment = true`
        .mip_level      selects the mip-level to render into
        .slice          selects the slice to render into

    .resolve_attachment a resolve-attachment-view object will be created
        .image          the sg_image parent resource, must have been created
                        with `sg_image_desc.usage.resolve_attachment = true`
        .mip_level      selects the mip-level to msaa-resolve into
        .slice          selects the slice to msaa-resolve into

    .depth_stencil_attachment   a depth-stencil-attachment-view object will be created
        .image          the sg_image parent resource, must have been created
                        with `sg_image_desc.usage.depth_stencil_attachment = true`
        .mip_level      selects the mip-level to render into
        .slice          selects the slice to render into
*/
Buffer_View_Desc :: struct {
    buffer : Buffer,
    offset : c.int,
}

Image_View_Desc :: struct {
    image : Image,
    mip_level : c.int,
    slice : c.int,
}

Texture_View_Range :: struct {
    base : c.int,
    count : c.int,
}

Texture_View_Desc :: struct {
    image : Image,
    mip_levels : Texture_View_Range,
    slices : Texture_View_Range,
}

View_Desc :: struct {
    _ : u32,
    texture : Texture_View_Desc,
    storage_buffer : Buffer_View_Desc,
    storage_image : Image_View_Desc,
    color_attachment : Image_View_Desc,
    resolve_attachment : Image_View_Desc,
    depth_stencil_attachment : Image_View_Desc,
    label : cstring,
    _ : u32,
}

/*
    sg_buffer_info
    sg_image_info
    sg_sampler_info
    sg_shader_info
    sg_pipeline_info
    sg_view_info

    These structs contain various internal resource attributes which
    might be useful for debug-inspection. Please don't rely on the
    actual content of those structs too much, as they are quite closely
    tied to sokol_gfx.h internals and may change more frequently than
    the other public API elements.

    The *_info structs are used as the return values of the following functions:

    sg_query_buffer_info()
    sg_query_image_info()
    sg_query_sampler_info()
    sg_query_shader_info()
    sg_query_pipeline_info()
    sg_query_view_info()
*/
Slot_Info :: struct {
    state : Resource_State,
    res_id : u32,
    uninit_count : u32,
}

Buffer_Info :: struct {
    slot : Slot_Info,
    update_frame_index : u32,
    append_frame_index : u32,
    append_pos : c.int,
    append_overflow : bool,
    num_slots : c.int,
    active_slot : c.int,
}

Image_Info :: struct {
    slot : Slot_Info,
    upd_frame_index : u32,
    num_slots : c.int,
    active_slot : c.int,
}

Sampler_Info :: struct {
    slot : Slot_Info,
}

Shader_Info :: struct {
    slot : Slot_Info,
}

Pipeline_Info :: struct {
    slot : Slot_Info,
}

View_Info :: struct {
    slot : Slot_Info,
}

/*
    sg_stats

    Allows to track generic and backend-specific rendering stats,
    obtained via sg_query_stats().
*/
Frame_Stats_Gl :: struct {
    num_bind_buffer : u32,
    num_active_texture : u32,
    num_bind_texture : u32,
    num_bind_sampler : u32,
    num_bind_image_texture : u32,
    num_use_program : u32,
    num_render_state : u32,
    num_vertex_attrib_pointer : u32,
    num_vertex_attrib_divisor : u32,
    num_enable_vertex_attrib_array : u32,
    num_disable_vertex_attrib_array : u32,
    num_uniform : u32,
    num_memory_barriers : u32,
}

Frame_Stats_D3d11_Pass :: struct {
    num_om_set_render_targets : u32,
    num_clear_render_target_view : u32,
    num_clear_depth_stencil_view : u32,
    num_resolve_subresource : u32,
}

Frame_Stats_D3d11_Pipeline :: struct {
    num_rs_set_state : u32,
    num_om_set_depth_stencil_state : u32,
    num_om_set_blend_state : u32,
    num_ia_set_primitive_topology : u32,
    num_ia_set_input_layout : u32,
    num_vs_set_shader : u32,
    num_vs_set_constant_buffers : u32,
    num_ps_set_shader : u32,
    num_ps_set_constant_buffers : u32,
    num_cs_set_shader : u32,
    num_cs_set_constant_buffers : u32,
}

Frame_Stats_D3d11_Bindings :: struct {
    num_ia_set_vertex_buffers : u32,
    num_ia_set_index_buffer : u32,
    num_vs_set_shader_resources : u32,
    num_vs_set_samplers : u32,
    num_ps_set_shader_resources : u32,
    num_ps_set_samplers : u32,
    num_cs_set_shader_resources : u32,
    num_cs_set_samplers : u32,
    num_cs_set_unordered_access_views : u32,
}

Frame_Stats_D3d11_Uniforms :: struct {
    num_update_subresource : u32,
}

Frame_Stats_D3d11_Draw :: struct {
    num_draw_indexed_instanced : u32,
    num_draw_indexed : u32,
    num_draw_instanced : u32,
    num_draw : u32,
}

Frame_Stats_D3d11 :: struct {
    pass : Frame_Stats_D3d11_Pass,
    pipeline : Frame_Stats_D3d11_Pipeline,
    bindings : Frame_Stats_D3d11_Bindings,
    uniforms : Frame_Stats_D3d11_Uniforms,
    draw : Frame_Stats_D3d11_Draw,
    num_map : u32,
    num_unmap : u32,
}

Frame_Stats_Metal_Idpool :: struct {
    num_added : u32,
    num_released : u32,
    num_garbage_collected : u32,
}

Frame_Stats_Metal_Pipeline :: struct {
    num_set_blend_color : u32,
    num_set_cull_mode : u32,
    num_set_front_facing_winding : u32,
    num_set_stencil_reference_value : u32,
    num_set_depth_bias : u32,
    num_set_render_pipeline_state : u32,
    num_set_depth_stencil_state : u32,
}

Frame_Stats_Metal_Bindings :: struct {
    num_set_vertex_buffer : u32,
    num_set_vertex_buffer_offset : u32,
    num_skip_redundant_vertex_buffer : u32,
    num_set_vertex_texture : u32,
    num_skip_redundant_vertex_texture : u32,
    num_set_vertex_sampler_state : u32,
    num_skip_redundant_vertex_sampler_state : u32,
    num_set_fragment_buffer : u32,
    num_set_fragment_buffer_offset : u32,
    num_skip_redundant_fragment_buffer : u32,
    num_set_fragment_texture : u32,
    num_skip_redundant_fragment_texture : u32,
    num_set_fragment_sampler_state : u32,
    num_skip_redundant_fragment_sampler_state : u32,
    num_set_compute_buffer : u32,
    num_set_compute_buffer_offset : u32,
    num_skip_redundant_compute_buffer : u32,
    num_set_compute_texture : u32,
    num_skip_redundant_compute_texture : u32,
    num_set_compute_sampler_state : u32,
    num_skip_redundant_compute_sampler_state : u32,
}

Frame_Stats_Metal_Uniforms :: struct {
    num_set_vertex_buffer_offset : u32,
    num_set_fragment_buffer_offset : u32,
    num_set_compute_buffer_offset : u32,
}

Frame_Stats_Metal :: struct {
    idpool : Frame_Stats_Metal_Idpool,
    pipeline : Frame_Stats_Metal_Pipeline,
    bindings : Frame_Stats_Metal_Bindings,
    uniforms : Frame_Stats_Metal_Uniforms,
}

Frame_Stats_Wgpu_Uniforms :: struct {
    num_set_bindgroup : u32,
    size_write_buffer : u32,
}

Frame_Stats_Wgpu_Bindings :: struct {
    num_set_vertex_buffer : u32,
    num_skip_redundant_vertex_buffer : u32,
    num_set_index_buffer : u32,
    num_skip_redundant_index_buffer : u32,
    num_create_bindgroup : u32,
    num_discard_bindgroup : u32,
    num_set_bindgroup : u32,
    num_skip_redundant_bindgroup : u32,
    num_bindgroup_cache_hits : u32,
    num_bindgroup_cache_misses : u32,
    num_bindgroup_cache_collisions : u32,
    num_bindgroup_cache_invalidates : u32,
    num_bindgroup_cache_hash_vs_key_mismatch : u32,
}

Frame_Stats_Wgpu :: struct {
    uniforms : Frame_Stats_Wgpu_Uniforms,
    bindings : Frame_Stats_Wgpu_Bindings,
}

Frame_Stats_Vk :: struct {
    num_cmd_pipeline_barrier : u32,
    num_allocate_memory : u32,
    num_free_memory : u32,
    size_allocate_memory : u32,
    num_delete_queue_added : u32,
    num_delete_queue_collected : u32,
    num_cmd_copy_buffer : u32,
    num_cmd_copy_buffer_to_image : u32,
    num_cmd_set_descriptor_buffer_offsets : u32,
    size_descriptor_buffer_writes : u32,
}

Frame_Resource_Stats :: struct {
    allocated : u32,
    deallocated : u32,
    inited : u32,
    uninited : u32,
}

Total_Resource_Stats :: struct {
    alive : u32,
    free : u32,
    allocated : u32,
    deallocated : u32,
    inited : u32,
    uninited : u32,
}

Total_Stats :: struct {
    buffers : Total_Resource_Stats,
    images : Total_Resource_Stats,
    samplers : Total_Resource_Stats,
    views : Total_Resource_Stats,
    shaders : Total_Resource_Stats,
    pipelines : Total_Resource_Stats,
}

Frame_Stats :: struct {
    frame_index : u32,
    num_passes : u32,
    num_apply_viewport : u32,
    num_apply_scissor_rect : u32,
    num_apply_pipeline : u32,
    num_apply_bindings : u32,
    num_apply_uniforms : u32,
    num_draw : u32,
    num_draw_ex : u32,
    num_dispatch : u32,
    num_update_buffer : u32,
    num_append_buffer : u32,
    num_update_image : u32,
    size_apply_uniforms : u32,
    size_update_buffer : u32,
    size_append_buffer : u32,
    size_update_image : u32,
    buffers : Frame_Resource_Stats,
    images : Frame_Resource_Stats,
    samplers : Frame_Resource_Stats,
    views : Frame_Resource_Stats,
    shaders : Frame_Resource_Stats,
    pipelines : Frame_Resource_Stats,
    gl : Frame_Stats_Gl,
    d3d11 : Frame_Stats_D3d11,
    metal : Frame_Stats_Metal,
    wgpu : Frame_Stats_Wgpu,
    vk : Frame_Stats_Vk,
}

Stats :: struct {
    prev_frame : Frame_Stats,
    cur_frame : Frame_Stats,
    total : Total_Stats,
}

Log_Item :: enum i32 {
    OK,
    MALLOC_FAILED,
    GL_TEXTURE_FORMAT_NOT_SUPPORTED,
    GL_3D_TEXTURES_NOT_SUPPORTED,
    GL_ARRAY_TEXTURES_NOT_SUPPORTED,
    GL_STORAGEBUFFER_GLSL_BINDING_OUT_OF_RANGE,
    GL_STORAGEIMAGE_GLSL_BINDING_OUT_OF_RANGE,
    GL_SHADER_COMPILATION_FAILED,
    GL_SHADER_LINKING_FAILED,
    GL_VERTEX_ATTRIBUTE_NOT_FOUND_IN_SHADER,
    GL_UNIFORMBLOCK_NAME_NOT_FOUND_IN_SHADER,
    GL_IMAGE_SAMPLER_NAME_NOT_FOUND_IN_SHADER,
    GL_FRAMEBUFFER_STATUS_UNDEFINED,
    GL_FRAMEBUFFER_STATUS_INCOMPLETE_ATTACHMENT,
    GL_FRAMEBUFFER_STATUS_INCOMPLETE_MISSING_ATTACHMENT,
    GL_FRAMEBUFFER_STATUS_UNSUPPORTED,
    GL_FRAMEBUFFER_STATUS_INCOMPLETE_MULTISAMPLE,
    GL_FRAMEBUFFER_STATUS_UNKNOWN,
    D3D11_FEATURE_LEVEL_0_DETECTED,
    D3D11_CREATE_BUFFER_FAILED,
    D3D11_CREATE_BUFFER_SRV_FAILED,
    D3D11_CREATE_BUFFER_UAV_FAILED,
    D3D11_CREATE_DEPTH_TEXTURE_UNSUPPORTED_PIXEL_FORMAT,
    D3D11_CREATE_DEPTH_TEXTURE_FAILED,
    D3D11_CREATE_2D_TEXTURE_UNSUPPORTED_PIXEL_FORMAT,
    D3D11_CREATE_2D_TEXTURE_FAILED,
    D3D11_CREATE_2D_SRV_FAILED,
    D3D11_CREATE_3D_TEXTURE_UNSUPPORTED_PIXEL_FORMAT,
    D3D11_CREATE_3D_TEXTURE_FAILED,
    D3D11_CREATE_3D_SRV_FAILED,
    D3D11_CREATE_MSAA_TEXTURE_FAILED,
    D3D11_CREATE_SAMPLER_STATE_FAILED,
    D3D11_UNIFORMBLOCK_HLSL_REGISTER_B_OUT_OF_RANGE,
    D3D11_STORAGEBUFFER_HLSL_REGISTER_T_OUT_OF_RANGE,
    D3D11_STORAGEBUFFER_HLSL_REGISTER_U_OUT_OF_RANGE,
    D3D11_IMAGE_HLSL_REGISTER_T_OUT_OF_RANGE,
    D3D11_STORAGEIMAGE_HLSL_REGISTER_U_OUT_OF_RANGE,
    D3D11_SAMPLER_HLSL_REGISTER_S_OUT_OF_RANGE,
    D3D11_LOAD_D3DCOMPILER_47_DLL_FAILED,
    D3D11_SHADER_COMPILATION_FAILED,
    D3D11_SHADER_COMPILATION_OUTPUT,
    D3D11_CREATE_CONSTANT_BUFFER_FAILED,
    D3D11_CREATE_INPUT_LAYOUT_FAILED,
    D3D11_CREATE_RASTERIZER_STATE_FAILED,
    D3D11_CREATE_DEPTH_STENCIL_STATE_FAILED,
    D3D11_CREATE_BLEND_STATE_FAILED,
    D3D11_CREATE_RTV_FAILED,
    D3D11_CREATE_DSV_FAILED,
    D3D11_CREATE_UAV_FAILED,
    D3D11_MAP_FOR_UPDATE_BUFFER_FAILED,
    D3D11_MAP_FOR_APPEND_BUFFER_FAILED,
    D3D11_MAP_FOR_UPDATE_IMAGE_FAILED,
    METAL_CREATE_BUFFER_FAILED,
    METAL_TEXTURE_FORMAT_NOT_SUPPORTED,
    METAL_CREATE_TEXTURE_FAILED,
    METAL_CREATE_SAMPLER_FAILED,
    METAL_SHADER_COMPILATION_FAILED,
    METAL_SHADER_CREATION_FAILED,
    METAL_SHADER_COMPILATION_OUTPUT,
    METAL_SHADER_ENTRY_NOT_FOUND,
    METAL_UNIFORMBLOCK_MSL_BUFFER_SLOT_OUT_OF_RANGE,
    METAL_STORAGEBUFFER_MSL_BUFFER_SLOT_OUT_OF_RANGE,
    METAL_STORAGEIMAGE_MSL_TEXTURE_SLOT_OUT_OF_RANGE,
    METAL_IMAGE_MSL_TEXTURE_SLOT_OUT_OF_RANGE,
    METAL_SAMPLER_MSL_SAMPLER_SLOT_OUT_OF_RANGE,
    METAL_CREATE_CPS_FAILED,
    METAL_CREATE_CPS_OUTPUT,
    METAL_CREATE_RPS_FAILED,
    METAL_CREATE_RPS_OUTPUT,
    METAL_CREATE_DSS_FAILED,
    WGPU_BINDGROUPS_POOL_EXHAUSTED,
    WGPU_BINDGROUPSCACHE_SIZE_GREATER_ONE,
    WGPU_BINDGROUPSCACHE_SIZE_POW2,
    WGPU_CREATEBINDGROUP_FAILED,
    WGPU_CREATE_BUFFER_FAILED,
    WGPU_CREATE_TEXTURE_FAILED,
    WGPU_CREATE_TEXTURE_VIEW_FAILED,
    WGPU_CREATE_SAMPLER_FAILED,
    WGPU_CREATE_SHADER_MODULE_FAILED,
    WGPU_SHADER_CREATE_BINDGROUP_LAYOUT_FAILED,
    WGPU_UNIFORMBLOCK_WGSL_GROUP0_BINDING_OUT_OF_RANGE,
    WGPU_TEXTURE_WGSL_GROUP1_BINDING_OUT_OF_RANGE,
    WGPU_STORAGEBUFFER_WGSL_GROUP1_BINDING_OUT_OF_RANGE,
    WGPU_STORAGEIMAGE_WGSL_GROUP1_BINDING_OUT_OF_RANGE,
    WGPU_SAMPLER_WGSL_GROUP1_BINDING_OUT_OF_RANGE,
    WGPU_CREATE_PIPELINE_LAYOUT_FAILED,
    WGPU_CREATE_RENDER_PIPELINE_FAILED,
    WGPU_CREATE_COMPUTE_PIPELINE_FAILED,
    VULKAN_REQUIRED_EXTENSION_FUNCTION_MISSING,
    VULKAN_ALLOC_DEVICE_MEMORY_NO_SUITABLE_MEMORY_TYPE,
    VULKAN_ALLOCATE_MEMORY_FAILED,
    VULKAN_ALLOC_BUFFER_DEVICE_MEMORY_FAILED,
    VULKAN_ALLOC_IMAGE_DEVICE_MEMORY_FAILED,
    VULKAN_DELETE_QUEUE_EXHAUSTED,
    VULKAN_STAGING_CREATE_BUFFER_FAILED,
    VULKAN_STAGING_ALLOCATE_MEMORY_FAILED,
    VULKAN_STAGING_BIND_BUFFER_MEMORY_FAILED,
    VULKAN_STAGING_STREAM_BUFFER_OVERFLOW,
    VULKAN_CREATE_SHARED_BUFFER_FAILED,
    VULKAN_ALLOCATE_SHARED_BUFFER_MEMORY_FAILED,
    VULKAN_BIND_SHARED_BUFFER_MEMORY_FAILED,
    VULKAN_MAP_SHARED_BUFFER_MEMORY_FAILED,
    VULKAN_CREATE_BUFFER_FAILED,
    VULKAN_BIND_BUFFER_MEMORY_FAILED,
    VULKAN_CREATE_IMAGE_FAILED,
    VULKAN_BIND_IMAGE_MEMORY_FAILED,
    VULKAN_CREATE_SHADER_MODULE_FAILED,
    VULKAN_UNIFORMBLOCK_SPIRV_SET0_BINDING_OUT_OF_RANGE,
    VULKAN_TEXTURE_SPIRV_SET1_BINDING_OUT_OF_RANGE,
    VULKAN_STORAGEBUFFER_SPIRV_SET1_BINDING_OUT_OF_RANGE,
    VULKAN_STORAGEIMAGE_SPIRV_SET1_BINDING_OUT_OF_RANGE,
    VULKAN_SAMPLER_SPIRV_SET1_BINDING_OUT_OF_RANGE,
    VULKAN_CREATE_DESCRIPTOR_SET_LAYOUT_FAILED,
    VULKAN_CREATE_PIPELINE_LAYOUT_FAILED,
    VULKAN_CREATE_GRAPHICS_PIPELINE_FAILED,
    VULKAN_CREATE_COMPUTE_PIPELINE_FAILED,
    VULKAN_CREATE_IMAGE_VIEW_FAILED,
    VULKAN_VIEW_MAX_DESCRIPTOR_SIZE,
    VULKAN_CREATE_SAMPLER_FAILED,
    VULKAN_SAMPLER_MAX_DESCRIPTOR_SIZE,
    VULKAN_WAIT_FOR_FENCE_FAILED,
    VULKAN_UNIFORM_BUFFER_OVERFLOW,
    VULKAN_DESCRIPTOR_BUFFER_OVERFLOW,
    IDENTICAL_COMMIT_LISTENER,
    COMMIT_LISTENER_ARRAY_FULL,
    TRACE_HOOKS_NOT_ENABLED,
    DEALLOC_BUFFER_INVALID_STATE,
    DEALLOC_IMAGE_INVALID_STATE,
    DEALLOC_SAMPLER_INVALID_STATE,
    DEALLOC_SHADER_INVALID_STATE,
    DEALLOC_PIPELINE_INVALID_STATE,
    DEALLOC_VIEW_INVALID_STATE,
    INIT_BUFFER_INVALID_STATE,
    INIT_IMAGE_INVALID_STATE,
    INIT_SAMPLER_INVALID_STATE,
    INIT_SHADER_INVALID_STATE,
    INIT_PIPELINE_INVALID_STATE,
    INIT_VIEW_INVALID_STATE,
    UNINIT_BUFFER_INVALID_STATE,
    UNINIT_IMAGE_INVALID_STATE,
    UNINIT_SAMPLER_INVALID_STATE,
    UNINIT_SHADER_INVALID_STATE,
    UNINIT_PIPELINE_INVALID_STATE,
    UNINIT_VIEW_INVALID_STATE,
    FAIL_BUFFER_INVALID_STATE,
    FAIL_IMAGE_INVALID_STATE,
    FAIL_SAMPLER_INVALID_STATE,
    FAIL_SHADER_INVALID_STATE,
    FAIL_PIPELINE_INVALID_STATE,
    FAIL_VIEW_INVALID_STATE,
    BUFFER_POOL_EXHAUSTED,
    IMAGE_POOL_EXHAUSTED,
    SAMPLER_POOL_EXHAUSTED,
    SHADER_POOL_EXHAUSTED,
    PIPELINE_POOL_EXHAUSTED,
    VIEW_POOL_EXHAUSTED,
    BEGINPASS_TOO_MANY_COLOR_ATTACHMENTS,
    BEGINPASS_TOO_MANY_RESOLVE_ATTACHMENTS,
    BEGINPASS_ATTACHMENTS_ALIVE,
    DRAW_WITHOUT_BINDINGS,
    SHADERDESC_TOO_MANY_VERTEXSTAGE_TEXTURES,
    SHADERDESC_TOO_MANY_FRAGMENTSTAGE_TEXTURES,
    SHADERDESC_TOO_MANY_COMPUTESTAGE_TEXTURES,
    SHADERDESC_TOO_MANY_VERTEXSTAGE_STORAGEBUFFERS,
    SHADERDESC_TOO_MANY_FRAGMENTSTAGE_STORAGEBUFFERS,
    SHADERDESC_TOO_MANY_COMPUTESTAGE_STORAGEBUFFERS,
    SHADERDESC_TOO_MANY_VERTEXSTAGE_STORAGEIMAGES,
    SHADERDESC_TOO_MANY_FRAGMENTSTAGE_STORAGEIMAGES,
    SHADERDESC_TOO_MANY_COMPUTESTAGE_STORAGEIMAGES,
    SHADERDESC_TOO_MANY_VERTEXSTAGE_TEXTURESAMPLERPAIRS,
    SHADERDESC_TOO_MANY_FRAGMENTSTAGE_TEXTURESAMPLERPAIRS,
    SHADERDESC_TOO_MANY_COMPUTESTAGE_TEXTURESAMPLERPAIRS,
    VALIDATE_BUFFERDESC_CANARY,
    VALIDATE_BUFFERDESC_IMMUTABLE_DYNAMIC_STREAM,
    VALIDATE_BUFFERDESC_SEPARATE_BUFFER_TYPES,
    VALIDATE_BUFFERDESC_EXPECT_NONZERO_SIZE,
    VALIDATE_BUFFERDESC_EXPECT_MATCHING_DATA_SIZE,
    VALIDATE_BUFFERDESC_EXPECT_ZERO_DATA_SIZE,
    VALIDATE_BUFFERDESC_EXPECT_NO_DATA,
    VALIDATE_BUFFERDESC_EXPECT_DATA,
    VALIDATE_BUFFERDESC_STORAGEBUFFER_SUPPORTED,
    VALIDATE_BUFFERDESC_STORAGEBUFFER_SIZE_MULTIPLE_4,
    VALIDATE_IMAGEDATA_NODATA,
    VALIDATE_IMAGEDATA_DATA_SIZE,
    VALIDATE_IMAGEDESC_CANARY,
    VALIDATE_IMAGEDESC_IMMUTABLE_DYNAMIC_STREAM,
    VALIDATE_IMAGEDESC_IMAGETYPE_2D_NUMSLICES,
    VALIDATE_IMAGEDESC_IMAGETYPE_CUBE_NUMSLICES,
    VALIDATE_IMAGEDESC_IMAGETYPE_ARRAY_NUMSLICES,
    VALIDATE_IMAGEDESC_IMAGETYPE_3D_NUMSLICES,
    VALIDATE_IMAGEDESC_NUMSLICES,
    VALIDATE_IMAGEDESC_WIDTH,
    VALIDATE_IMAGEDESC_HEIGHT,
    VALIDATE_IMAGEDESC_NONRT_PIXELFORMAT,
    VALIDATE_IMAGEDESC_MSAA_BUT_NO_ATTACHMENT,
    VALIDATE_IMAGEDESC_DEPTH_3D_IMAGE,
    VALIDATE_IMAGEDESC_ATTACHMENT_EXPECT_IMMUTABLE,
    VALIDATE_IMAGEDESC_ATTACHMENT_EXPECT_NO_DATA,
    VALIDATE_IMAGEDESC_ATTACHMENT_PIXELFORMAT,
    VALIDATE_IMAGEDESC_ATTACHMENT_RESOLVE_EXPECT_NO_MSAA,
    VALIDATE_IMAGEDESC_ATTACHMENT_NO_MSAA_SUPPORT,
    VALIDATE_IMAGEDESC_ATTACHMENT_MSAA_NUM_MIPMAPS,
    VALIDATE_IMAGEDESC_ATTACHMENT_MSAA_3D_IMAGE,
    VALIDATE_IMAGEDESC_ATTACHMENT_MSAA_CUBE_IMAGE,
    VALIDATE_IMAGEDESC_ATTACHMENT_MSAA_ARRAY_IMAGE,
    VALIDATE_IMAGEDESC_STORAGEIMAGE_PIXELFORMAT,
    VALIDATE_IMAGEDESC_STORAGEIMAGE_EXPECT_NO_MSAA,
    VALIDATE_IMAGEDESC_INJECTED_NO_DATA,
    VALIDATE_IMAGEDESC_DYNAMIC_NO_DATA,
    VALIDATE_IMAGEDESC_COMPRESSED_IMMUTABLE,
    VALIDATE_SAMPLERDESC_CANARY,
    VALIDATE_SAMPLERDESC_ANISTROPIC_REQUIRES_LINEAR_FILTERING,
    VALIDATE_SHADERDESC_CANARY,
    VALIDATE_SHADERDESC_VERTEX_SOURCE,
    VALIDATE_SHADERDESC_FRAGMENT_SOURCE,
    VALIDATE_SHADERDESC_COMPUTE_SOURCE,
    VALIDATE_SHADERDESC_VERTEX_SOURCE_OR_BYTECODE,
    VALIDATE_SHADERDESC_FRAGMENT_SOURCE_OR_BYTECODE,
    VALIDATE_SHADERDESC_COMPUTE_SOURCE_OR_BYTECODE,
    VALIDATE_SHADERDESC_INVALID_SHADER_COMBO,
    VALIDATE_SHADERDESC_NO_BYTECODE_SIZE,
    VALIDATE_SHADERDESC_METAL_THREADS_PER_THREADGROUP_INITIALIZED,
    VALIDATE_SHADERDESC_METAL_THREADS_PER_THREADGROUP_MULTIPLE_32,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_NO_CONT_MEMBERS,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_SIZE_IS_ZERO,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_METAL_BUFFER_SLOT_COLLISION,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_HLSL_REGISTER_B_COLLISION,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_WGSL_GROUP0_BINDING_COLLISION,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_SPIRV_SET0_BINDING_COLLISION,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_NO_MEMBERS,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_UNIFORM_GLSL_NAME,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_SIZE_MISMATCH,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_ARRAY_COUNT,
    VALIDATE_SHADERDESC_UNIFORMBLOCK_STD140_ARRAY_TYPE,
    VALIDATE_SHADERDESC_VIEW_STORAGEBUFFER_METAL_BUFFER_SLOT_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEBUFFER_HLSL_REGISTER_T_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEBUFFER_HLSL_REGISTER_U_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEBUFFER_GLSL_BINDING_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEBUFFER_WGSL_GROUP1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEBUFFER_SPIRV_SET1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEIMAGE_EXPECT_COMPUTE_STAGE,
    VALIDATE_SHADERDESC_VIEW_STORAGEIMAGE_METAL_TEXTURE_SLOT_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEIMAGE_HLSL_REGISTER_U_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEIMAGE_GLSL_BINDING_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEIMAGE_WGSL_GROUP1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_VIEW_STORAGEIMAGE_SPIRV_SET1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_VIEW_TEXTURE_METAL_TEXTURE_SLOT_COLLISION,
    VALIDATE_SHADERDESC_VIEW_TEXTURE_HLSL_REGISTER_T_COLLISION,
    VALIDATE_SHADERDESC_VIEW_TEXTURE_WGSL_GROUP1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_VIEW_TEXTURE_SPIRV_SET1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_SAMPLER_METAL_SAMPLER_SLOT_COLLISION,
    VALIDATE_SHADERDESC_SAMPLER_HLSL_REGISTER_S_COLLISION,
    VALIDATE_SHADERDESC_SAMPLER_WGSL_GROUP1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_SAMPLER_SPIRV_SET1_BINDING_COLLISION,
    VALIDATE_SHADERDESC_TEXTURE_SAMPLER_PAIR_VIEW_SLOT_OUT_OF_RANGE,
    VALIDATE_SHADERDESC_TEXTURE_SAMPLER_PAIR_SAMPLER_SLOT_OUT_OF_RANGE,
    VALIDATE_SHADERDESC_TEXTURE_SAMPLER_PAIR_TEXTURE_STAGE_MISMATCH,
    VALIDATE_SHADERDESC_TEXTURE_SAMPLER_PAIR_EXPECT_TEXTURE_VIEW,
    VALIDATE_SHADERDESC_TEXTURE_SAMPLER_PAIR_SAMPLER_STAGE_MISMATCH,
    VALIDATE_SHADERDESC_TEXTURE_SAMPLER_PAIR_GLSL_NAME,
    VALIDATE_SHADERDESC_NONFILTERING_SAMPLER_REQUIRED,
    VALIDATE_SHADERDESC_COMPARISON_SAMPLER_REQUIRED,
    VALIDATE_SHADERDESC_TEXVIEW_NOT_REFERENCED_BY_TEXTURE_SAMPLER_PAIRS,
    VALIDATE_SHADERDESC_SAMPLER_NOT_REFERENCED_BY_TEXTURE_SAMPLER_PAIRS,
    VALIDATE_SHADERDESC_ATTR_STRING_TOO_LONG,
    VALIDATE_PIPELINEDESC_CANARY,
    VALIDATE_PIPELINEDESC_SHADER,
    VALIDATE_PIPELINEDESC_COMPUTE_SHADER_EXPECTED,
    VALIDATE_PIPELINEDESC_NO_COMPUTE_SHADER_EXPECTED,
    VALIDATE_PIPELINEDESC_NO_CONT_ATTRS,
    VALIDATE_PIPELINEDESC_ATTR_BASETYPE_MISMATCH,
    VALIDATE_PIPELINEDESC_LAYOUT_STRIDE4,
    VALIDATE_PIPELINEDESC_ATTR_SEMANTICS,
    VALIDATE_PIPELINEDESC_SHADER_READONLY_STORAGEBUFFERS,
    VALIDATE_PIPELINEDESC_BLENDOP_MINMAX_REQUIRES_BLENDFACTOR_ONE,
    VALIDATE_VIEWDESC_CANARY,
    VALIDATE_VIEWDESC_UNIQUE_VIEWTYPE,
    VALIDATE_VIEWDESC_ANY_VIEWTYPE,
    VALIDATE_VIEWDESC_RESOURCE_ALIVE,
    VALIDATE_VIEWDESC_RESOURCE_FAILED,
    VALIDATE_VIEWDESC_STORAGEBUFFER_OFFSET_VS_BUFFER_SIZE,
    VALIDATE_VIEWDESC_STORAGEBUFFER_OFFSET_MULTIPLE_256,
    VALIDATE_VIEWDESC_STORAGEBUFFER_USAGE,
    VALIDATE_VIEWDESC_STORAGEIMAGE_USAGE,
    VALIDATE_VIEWDESC_COLORATTACHMENT_USAGE,
    VALIDATE_VIEWDESC_RESOLVEATTACHMENT_USAGE,
    VALIDATE_VIEWDESC_DEPTHSTENCILATTACHMENT_USAGE,
    VALIDATE_VIEWDESC_IMAGE_MIPLEVEL,
    VALIDATE_VIEWDESC_IMAGE_2D_SLICE,
    VALIDATE_VIEWDESC_IMAGE_CUBEMAP_SLICE,
    VALIDATE_VIEWDESC_IMAGE_ARRAY_SLICE,
    VALIDATE_VIEWDESC_IMAGE_3D_SLICE,
    VALIDATE_VIEWDESC_TEXTURE_EXPECT_NO_MSAA,
    VALIDATE_VIEWDESC_TEXTURE_MIPLEVELS,
    VALIDATE_VIEWDESC_TEXTURE_2D_SLICES,
    VALIDATE_VIEWDESC_TEXTURE_CUBEMAP_SLICES,
    VALIDATE_VIEWDESC_TEXTURE_ARRAY_SLICES,
    VALIDATE_VIEWDESC_TEXTURE_3D_SLICES,
    VALIDATE_VIEWDESC_STORAGEIMAGE_PIXELFORMAT,
    VALIDATE_VIEWDESC_COLORATTACHMENT_PIXELFORMAT,
    VALIDATE_VIEWDESC_DEPTHSTENCILATTACHMENT_PIXELFORMAT,
    VALIDATE_VIEWDESC_RESOLVEATTACHMENT_SAMPLECOUNT,
    VALIDATE_BEGINPASS_CANARY,
    VALIDATE_BEGINPASS_COMPUTEPASS_EXPECT_NO_ATTACHMENTS,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_WIDTH,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_WIDTH_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_HEIGHT,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_HEIGHT_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_SAMPLECOUNT,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_SAMPLECOUNT_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_COLORFORMAT,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_COLORFORMAT_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_EXPECT_DEPTHFORMAT_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_METAL_EXPECT_CURRENTDRAWABLE,
    VALIDATE_BEGINPASS_SWAPCHAIN_METAL_EXPECT_CURRENTDRAWABLE_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_METAL_EXPECT_DEPTHSTENCILTEXTURE,
    VALIDATE_BEGINPASS_SWAPCHAIN_METAL_EXPECT_DEPTHSTENCILTEXTURE_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_METAL_EXPECT_MSAACOLORTEXTURE,
    VALIDATE_BEGINPASS_SWAPCHAIN_METAL_EXPECT_MSAACOLORTEXTURE_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_D3D11_EXPECT_RENDERVIEW,
    VALIDATE_BEGINPASS_SWAPCHAIN_D3D11_EXPECT_RENDERVIEW_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_D3D11_EXPECT_RESOLVEVIEW,
    VALIDATE_BEGINPASS_SWAPCHAIN_D3D11_EXPECT_RESOLVEVIEW_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_D3D11_EXPECT_DEPTHSTENCILVIEW,
    VALIDATE_BEGINPASS_SWAPCHAIN_D3D11_EXPECT_DEPTHSTENCILVIEW_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_WGPU_EXPECT_RENDERVIEW,
    VALIDATE_BEGINPASS_SWAPCHAIN_WGPU_EXPECT_RENDERVIEW_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_WGPU_EXPECT_RESOLVEVIEW,
    VALIDATE_BEGINPASS_SWAPCHAIN_WGPU_EXPECT_RESOLVEVIEW_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_WGPU_EXPECT_DEPTHSTENCILVIEW,
    VALIDATE_BEGINPASS_SWAPCHAIN_WGPU_EXPECT_DEPTHSTENCILVIEW_NOTSET,
    VALIDATE_BEGINPASS_SWAPCHAIN_GL_EXPECT_FRAMEBUFFER_NOTSET,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEWS_CONTINUOUS,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_ALIVE,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_VALID,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_TYPE,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_IMAGE_ALIVE,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_IMAGE_VALID,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_SIZES,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_SAMPLECOUNT,
    VALIDATE_BEGINPASS_COLORATTACHMENTVIEW_SAMPLECOUNTS_EQUAL,
    VALIDATE_BEGINPASS_RESOLVEATTACHMENTVIEW_NO_COLORATTACHMENTVIEW,
    VALIDATE_BEGINPASS_RESOLVEATTACHMENTVIEW_ALIVE,
    VALIDATE_BEGINPASS_RESOLVEATTACHMENTVIEW_VALID,
    VALIDATE_BEGINPASS_RESOLVEATTACHMENTVIEW_TYPE,
    VALIDATE_BEGINPASS_RESOLVEATTACHMENTVIEW_IMAGE_ALIVE,
    VALIDATE_BEGINPASS_RESOLVEATTACHMENTVIEW_IMAGE_VALID,
    VALIDATE_BEGINPASS_RESOLVEATTACHMENTVIEW_SIZES,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEWS_CONTINUOUS,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEW_ALIVE,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEW_VALID,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEW_TYPE,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEW_IMAGE_ALIVE,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEW_IMAGE_VALID,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEW_SIZES,
    VALIDATE_BEGINPASS_DEPTHSTENCILATTACHMENTVIEW_SAMPLECOUNT,
    VALIDATE_BEGINPASS_ATTACHMENTS_EXPECTED,
    VALIDATE_AVP_RENDERPASS_EXPECTED,
    VALIDATE_ASR_RENDERPASS_EXPECTED,
    VALIDATE_APIP_PIPELINE_VALID_ID,
    VALIDATE_APIP_PIPELINE_EXISTS,
    VALIDATE_APIP_PIPELINE_VALID,
    VALIDATE_APIP_PASS_EXPECTED,
    VALIDATE_APIP_PIPELINE_SHADER_ALIVE,
    VALIDATE_APIP_PIPELINE_SHADER_VALID,
    VALIDATE_APIP_COMPUTEPASS_EXPECTED,
    VALIDATE_APIP_RENDERPASS_EXPECTED,
    VALIDATE_APIP_SWAPCHAIN_COLOR_COUNT,
    VALIDATE_APIP_SWAPCHAIN_COLOR_FORMAT,
    VALIDATE_APIP_SWAPCHAIN_DEPTH_FORMAT,
    VALIDATE_APIP_SWAPCHAIN_SAMPLE_COUNT,
    VALIDATE_APIP_ATTACHMENTS_ALIVE,
    VALIDATE_APIP_COLORATTACHMENTS_COUNT,
    VALIDATE_APIP_COLORATTACHMENTS_VIEW_VALID,
    VALIDATE_APIP_COLORATTACHMENTS_IMAGE_VALID,
    VALIDATE_APIP_COLORATTACHMENTS_FORMAT,
    VALIDATE_APIP_DEPTHSTENCILATTACHMENT_VIEW_VALID,
    VALIDATE_APIP_DEPTHSTENCILATTACHMENT_IMAGE_VALID,
    VALIDATE_APIP_DEPTHSTENCILATTACHMENT_FORMAT,
    VALIDATE_APIP_ATTACHMENT_SAMPLE_COUNT,
    VALIDATE_ABND_PASS_EXPECTED,
    VALIDATE_ABND_EMPTY_BINDINGS,
    VALIDATE_ABND_NO_PIPELINE,
    VALIDATE_ABND_PIPELINE_ALIVE,
    VALIDATE_ABND_PIPELINE_VALID,
    VALIDATE_ABND_PIPELINE_SHADER_ALIVE,
    VALIDATE_ABND_PIPELINE_SHADER_VALID,
    VALIDATE_ABND_COMPUTE_EXPECTED_NO_VBUFS,
    VALIDATE_ABND_COMPUTE_EXPECTED_NO_IBUF,
    VALIDATE_ABND_EXPECTED_VBUF,
    VALIDATE_ABND_VBUF_ALIVE,
    VALIDATE_ABND_VBUF_USAGE,
    VALIDATE_ABND_VBUF_OVERFLOW,
    VALIDATE_ABND_EXPECTED_NO_IBUF,
    VALIDATE_ABND_EXPECTED_IBUF,
    VALIDATE_ABND_IBUF_ALIVE,
    VALIDATE_ABND_IBUF_USAGE,
    VALIDATE_ABND_IBUF_OVERFLOW,
    VALIDATE_ABND_EXPECTED_VIEW_BINDING,
    VALIDATE_ABND_VIEW_ALIVE,
    VALIDATE_ABND_EXPECT_TEXVIEW,
    VALIDATE_ABND_EXPECT_SBVIEW,
    VALIDATE_ABND_EXPECT_SIMGVIEW,
    VALIDATE_ABND_TEXVIEW_IMAGETYPE_MISMATCH,
    VALIDATE_ABND_TEXVIEW_EXPECTED_MULTISAMPLED_IMAGE,
    VALIDATE_ABND_TEXVIEW_EXPECTED_NON_MULTISAMPLED_IMAGE,
    VALIDATE_ABND_TEXVIEW_EXPECTED_FILTERABLE_IMAGE,
    VALIDATE_ABND_TEXVIEW_EXPECTED_DEPTH_IMAGE,
    VALIDATE_ABND_SBVIEW_READWRITE_IMMUTABLE,
    VALIDATE_ABND_SIMGVIEW_COMPUTE_PASS_EXPECTED,
    VALIDATE_ABND_SIMGVIEW_IMAGETYPE_MISMATCH,
    VALIDATE_ABND_SIMGVIEW_ACCESSFORMAT,
    VALIDATE_ABND_EXPECTED_SAMPLER_BINDING,
    VALIDATE_ABND_UNEXPECTED_SAMPLER_COMPARE_NEVER,
    VALIDATE_ABND_EXPECTED_SAMPLER_COMPARE_NEVER,
    VALIDATE_ABND_EXPECTED_NONFILTERING_SAMPLER,
    VALIDATE_ABND_SAMPLER_ALIVE,
    VALIDATE_ABND_SAMPLER_VALID,
    VALIDATE_ABND_TEXTURE_BINDING_VS_DEPTHSTENCIL_ATTACHMENT,
    VALIDATE_ABND_TEXTURE_BINDING_VS_COLOR_ATTACHMENT,
    VALIDATE_ABND_TEXTURE_BINDING_VS_RESOLVE_ATTACHMENT,
    VALIDATE_ABND_TEXTURE_VS_STORAGEIMAGE_BINDING,
    VALIDATE_AU_PASS_EXPECTED,
    VALIDATE_AU_NO_PIPELINE,
    VALIDATE_AU_PIPELINE_ALIVE,
    VALIDATE_AU_PIPELINE_VALID,
    VALIDATE_AU_PIPELINE_SHADER_ALIVE,
    VALIDATE_AU_PIPELINE_SHADER_VALID,
    VALIDATE_AU_NO_UNIFORMBLOCK_AT_SLOT,
    VALIDATE_AU_SIZE,
    VALIDATE_DRAW_RENDERPASS_EXPECTED,
    VALIDATE_DRAW_BASEELEMENT_GE_ZERO,
    VALIDATE_DRAW_NUMELEMENTS_GE_ZERO,
    VALIDATE_DRAW_NUMINSTANCES_GE_ZERO,
    VALIDATE_DRAW_EX_RENDERPASS_EXPECTED,
    VALIDATE_DRAW_EX_BASEELEMENT_GE_ZERO,
    VALIDATE_DRAW_EX_NUMELEMENTS_GE_ZERO,
    VALIDATE_DRAW_EX_NUMINSTANCES_GE_ZERO,
    VALIDATE_DRAW_EX_BASEINSTANCE_GE_ZERO,
    VALIDATE_DRAW_EX_BASEVERTEX_VS_INDEXED,
    VALIDATE_DRAW_EX_BASEINSTANCE_VS_INSTANCED,
    VALIDATE_DRAW_EX_BASEVERTEX_NOT_SUPPORTED,
    VALIDATE_DRAW_EX_BASEINSTANCE_NOT_SUPPORTED,
    VALIDATE_DRAW_REQUIRED_BINDINGS_OR_UNIFORMS_MISSING,
    VALIDATE_DISPATCH_COMPUTEPASS_EXPECTED,
    VALIDATE_DISPATCH_NUMGROUPSX,
    VALIDATE_DISPATCH_NUMGROUPSY,
    VALIDATE_DISPATCH_NUMGROUPSZ,
    VALIDATE_DISPATCH_REQUIRED_BINDINGS_OR_UNIFORMS_MISSING,
    VALIDATE_UPDATEBUF_USAGE,
    VALIDATE_UPDATEBUF_SIZE,
    VALIDATE_UPDATEBUF_ONCE,
    VALIDATE_UPDATEBUF_APPEND,
    VALIDATE_APPENDBUF_USAGE,
    VALIDATE_APPENDBUF_SIZE,
    VALIDATE_APPENDBUF_UPDATE,
    VALIDATE_UPDIMG_USAGE,
    VALIDATE_UPDIMG_ONCE,
    VALIDATION_FAILED,
}

/*
    sg_desc

    The sg_desc struct contains configuration values for sokol_gfx,
    it is used as parameter to the sg_setup() call.

    The default configuration is:

    .buffer_pool_size                   128
    .image_pool_size                    128
    .sampler_pool_size                  64
    .shader_pool_size                   32
    .pipeline_pool_size                 64
    .view_pool_size                     256
    .uniform_buffer_size                4 MB (4*1024*1024)
    .max_commit_listeners               1024
    .disable_validation                 false
    .metal.force_managed_storage_mode   false
    .metal.use_command_buffer_with_retained_references  false
    .wgpu.disable_bindgroups_cache      false
    .wgpu.bindgroups_cache_size         1024
    .vulkan.copy_staging_buffer_size    4 MB
    .vulkan.stream_staging_buffer_size  16 MB
    .vulkan.descriptor_buffer_size      16 MB

    .allocator.alloc_fn     0 (in this case, malloc() will be called)
    .allocator.free_fn      0 (in this case, free() will be called)
    .allocator.user_data    0

    .environment.defaults.color_format: default value depends on selected backend:
        all GL backends:    SG_PIXELFORMAT_RGBA8
        Metal and D3D11:    SG_PIXELFORMAT_BGRA8
        WebGPU:             *no default* (must be queried from WebGPU swapchain object)
    .environment.defaults.depth_format: SG_PIXELFORMAT_DEPTH_STENCIL
    .environment.defaults.sample_count: 1

    Metal specific:
        (NOTE: All Objective-C object references are transferred through
        a bridged cast (__bridge const void*) to sokol_gfx, which will use an
        unretained bridged cast (__bridge id<xxx>) to retrieve the Objective-C
        references back. Since the bridge cast is unretained, the caller
        must hold a strong reference to the Objective-C object until sg_setup()
        returns.

        .metal.force_managed_storage_mode
            when enabled, Metal buffers and texture resources are created in managed storage
            mode, otherwise sokol-gfx will decide whether to create buffers and
            textures in managed or shared storage mode (this is mainly a debugging option)
        .metal.use_command_buffer_with_retained_references
            when true, the sokol-gfx Metal backend will use Metal command buffers which
            bump the reference count of resource objects as long as they are inflight,
            this is slower than the default command-buffer-with-unretained-references
            method, this may be a workaround when confronted with lifetime validation
            errors from the Metal validation layer until a proper fix has been implemented
        .environment.metal.device
            a pointer to the MTLDevice object

    D3D11 specific:
        .environment.d3d11.device
            a pointer to the ID3D11Device object, this must have been created
            before sg_setup() is called
        .environment.d3d11.device_context
            a pointer to the ID3D11DeviceContext object
        .d3d11.shader_debugging
            set this to true to compile shaders which are provided as HLSL source
            code with debug information and without optimization, this allows
            shader debugging in tools like RenderDoc, to output source code
            instead of byte code from sokol-shdc, omit the `--binary` cmdline
            option

    WebGPU specific:
        .wgpu.disable_bindgroups_cache
            When this is true, the WebGPU backend will create and immediately
            release a BindGroup object in the sg_apply_bindings() call, only
            use this for debugging purposes.
        .wgpu.bindgroups_cache_size
            The size of the bindgroups cache for re-using BindGroup objects
            between sg_apply_bindings() calls. The smaller the cache size,
            the more likely are cache slot collisions which will cause
            a BindGroups object to be destroyed and a new one created.
            Use the information returned by sg_query_stats() to check
            if this is a frequent occurrence, and increase the cache size as
            needed (the default is 1024).
            NOTE: wgpu_bindgroups_cache_size must be a power-of-2 number!
        .environment.wgpu.device
            a WGPUDevice handle

    Vulkan specific:
        .vulkan.copy_staging_buffer_size
            Size of the staging buffer in bytes for uploading the initial
            content of buffers and images, and for updating
            .usage.dynamic_update resources. The default is 4 MB,
            bigger resource updates are split into multiple chunks
            of the staging buffer size
        .vulkan.stream_staging_buffer_size
            Size of the staging buffer in bytes for updating .usage.stream_update
            resources. The default is 16 MB. The size must be big enough
            to accomodate all update into .usage.stream_update resources.
            Any additional data will cause an error log message and
            incomplete rendering. Note that the actually allocated size
            will be twice as much because the stream-staging-buffer is
            double-buffered.
        .vulkan.descriptor_buffer_size
            Size of the descriptor-upload buffer in bytes. The default
            size is 16 bytes. The size must be big enough to accomodate
            all unifrom-block, view- and sampler-bindings in a single
            frame (assume a worst-case of 256 bytes per binding). Note
            that the actually allocated size will be twice as much
            because the descriptor-buffer is double-buffered.

    When using sokol_gfx.h and sokol_app.h together, consider using the
    helper function sglue_environment() in the sokol_glue.h header to
    initialize the sg_desc.environment nested struct. sglue_environment() returns
    a completely initialized sg_environment struct with information
    provided by sokol_app.h.
*/
Environment_Defaults :: struct {
    color_format : Pixel_Format,
    depth_format : Pixel_Format,
    sample_count : c.int,
}

Metal_Environment :: struct {
    device : rawptr,
}

D3d11_Environment :: struct {
    device : rawptr,
    device_context : rawptr,
}

Wgpu_Environment :: struct {
    device : rawptr,
}

Vulkan_Environment :: struct {
    physical_device : rawptr,
    device : rawptr,
    queue : rawptr,
    queue_family_index : u32,
}

Environment :: struct {
    defaults : Environment_Defaults,
    metal : Metal_Environment,
    d3d11 : D3d11_Environment,
    wgpu : Wgpu_Environment,
    vulkan : Vulkan_Environment,
}

/*
    sg_commit_listener

    Used with function sg_add_commit_listener() to add a callback
    which will be called in sg_commit(). This is useful for libraries
    building on top of sokol-gfx to be notified about when a frame
    ends (instead of having to guess, or add a manual 'new-frame'
    function.
*/
Commit_Listener :: struct {
    func : proc "c" (a0: rawptr),
    user_data : rawptr,
}

/*
    sg_allocator

    Used in sg_desc to provide custom memory-alloc and -free functions
    to sokol_gfx.h. If memory management should be overridden, both the
    alloc_fn and free_fn function must be provided (e.g. it's not valid to
    override one function but not the other).
*/
Allocator :: struct {
    alloc_fn : proc "c" (a0: c.size_t, a1: rawptr) -> rawptr,
    free_fn : proc "c" (a0: rawptr, a1: rawptr),
    user_data : rawptr,
}

/*
    sg_logger

    Used in sg_desc to provide a logging function. Please be aware
    that without logging function, sokol-gfx will be completely
    silent, e.g. it will not report errors, warnings and
    validation layer messages. For maximum error verbosity,
    compile in debug mode (e.g. NDEBUG *not* defined) and provide a
    compatible logger function in the sg_setup() call
    (for instance the standard logging function from sokol_log.h).
*/
Logger :: struct {
    func : proc "c" (a0: cstring, a1: u32, a2: u32, a3: cstring, a4: u32, a5: cstring, a6: rawptr),
    user_data : rawptr,
}

D3d11_Desc :: struct {
    shader_debugging : bool,
}

Metal_Desc :: struct {
    force_managed_storage_mode : bool,
    use_command_buffer_with_retained_references : bool,
}

Wgpu_Desc :: struct {
    disable_bindgroups_cache : bool,
    bindgroups_cache_size : c.int,
}

Vulkan_Desc :: struct {
    copy_staging_buffer_size : c.int,
    stream_staging_buffer_size : c.int,
    descriptor_buffer_size : c.int,
}

Desc :: struct {
    _ : u32,
    buffer_pool_size : c.int,
    image_pool_size : c.int,
    sampler_pool_size : c.int,
    shader_pool_size : c.int,
    pipeline_pool_size : c.int,
    view_pool_size : c.int,
    uniform_buffer_size : c.int,
    max_commit_listeners : c.int,
    disable_validation : bool,
    enforce_portable_limits : bool,
    d3d11 : D3d11_Desc,
    metal : Metal_Desc,
    wgpu : Wgpu_Desc,
    vulkan : Vulkan_Desc,
    allocator : Allocator,
    logger : Logger,
    environment : Environment,
    _ : u32,
}

/*
    Backend-specific structs and functions, these may come in handy for mixing
      sokol-gfx rendering with 'native backend' rendering functions.

      This group of functions will be expanded as needed.
*/
D3d11_Buffer_Info :: struct {
    buf : rawptr,
}

D3d11_Image_Info :: struct {
    tex2d : rawptr,
    tex3d : rawptr,
    res : rawptr,
}

D3d11_Sampler_Info :: struct {
    smp : rawptr,
}

D3d11_Shader_Info :: struct {
    cbufs : [8]rawptr,
    vs : rawptr,
    fs : rawptr,
}

D3d11_Pipeline_Info :: struct {
    il : rawptr,
    rs : rawptr,
    dss : rawptr,
    bs : rawptr,
}

D3d11_View_Info :: struct {
    srv : rawptr,
    uav : rawptr,
    rtv : rawptr,
    dsv : rawptr,
}

Mtl_Buffer_Info :: struct {
    buf : [2]rawptr,
    active_slot : c.int,
}

Mtl_Image_Info :: struct {
    tex : [2]rawptr,
    active_slot : c.int,
}

Mtl_Sampler_Info :: struct {
    smp : rawptr,
}

Mtl_Shader_Info :: struct {
    vertex_lib : rawptr,
    fragment_lib : rawptr,
    vertex_func : rawptr,
    fragment_func : rawptr,
}

Mtl_Pipeline_Info :: struct {
    rps : rawptr,
    dss : rawptr,
}

Wgpu_Buffer_Info :: struct {
    buf : rawptr,
}

Wgpu_Image_Info :: struct {
    tex : rawptr,
}

Wgpu_Sampler_Info :: struct {
    smp : rawptr,
}

Wgpu_Shader_Info :: struct {
    vs_mod : rawptr,
    fs_mod : rawptr,
    bgl : rawptr,
}

Wgpu_Pipeline_Info :: struct {
    render_pipeline : rawptr,
    compute_pipeline : rawptr,
}

Wgpu_View_Info :: struct {
    view : rawptr,
}

Gl_Buffer_Info :: struct {
    buf : [2]u32,
    active_slot : c.int,
}

Gl_Image_Info :: struct {
    tex : [2]u32,
    tex_target : u32,
    active_slot : c.int,
}

Gl_Sampler_Info :: struct {
    smp : u32,
}

Gl_Shader_Info :: struct {
    prog : u32,
}

Gl_View_Info :: struct {
    tex_view : [2]u32,
    msaa_render_buffer : u32,
    msaa_resolve_frame_buffer : u32,
}

