app-templ/src/saura/core/ui/ui.cpp

#include "ui.hpp"

#include <imgui.h>
#include <imgui_impl_sdl3.h>
#include <imgui_impl_sdlrenderer3.h>

namespace saura::ui {
Context::Context(std::weak_ptr<os::Window_Context> window_ctx) {
  this->window_ctx = window_ctx;
}

void Context::init() {
  IMGUI_CHECKVERSION();
  ImGui::CreateContext();
  ImGuiIO &io = ImGui::GetIO();
  io.Fonts->AddFontFromFileTTF("res/fonts/InterRegular.ttf", 18, nullptr,
                               io.Fonts->GetGlyphRangesCyrillic());

  (void)io;
  io.ConfigFlags |=
      ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
  io.ConfigFlags |=
      ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls

  // Setup Dear ImGui style
  ImGui::StyleColorsDark();

  // Setup Platform/Renderer backends
  ImGui_ImplSDL3_InitForSDLRenderer(this->window_ctx.lock()->handle,
                                    this->window_ctx.lock()->renderer);
  ImGui_ImplSDLRenderer3_Init(this->window_ctx.lock()->renderer);
}

void Context::deinit() {
  ImGui_ImplSDLRenderer3_Shutdown();
  ImGui_ImplSDL3_Shutdown();
  ImGui::DestroyContext();
}

void Context::update_events(SDL_Event &event) {
  ImGui_ImplSDL3_ProcessEvent(&event);
}

void Context::begin() {
  ImGui_ImplSDLRenderer3_NewFrame();
  ImGui_ImplSDL3_NewFrame();
  ImGui::NewFrame();
}

void Context::end() {
    ImVec4 clear_color = {0.15f, 0.15f, 0.15f, 0.0f};
    ImGuiIO &io = ImGui::GetIO();
    (void)io;
    ImGui::Render();
    SDL_SetRenderScale(this->window_ctx.lock()->renderer, io.DisplayFramebufferScale.x,
                       io.DisplayFramebufferScale.y);
    SDL_SetRenderDrawColorFloat(this->window_ctx.lock()->renderer, clear_color.x,
                                clear_color.y, clear_color.z, clear_color.w);
    SDL_RenderClear(this->window_ctx.lock()->renderer);
    ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData(),
                                          this->window_ctx.lock()->renderer);

    SDL_RenderPresent(this->window_ctx.lock()->renderer);
}
} // namespace saura::ui