@header package main

@header import sg "third-party:sokol/gfx"
@header import m "huginn:core/math"

@vs vs
layout(binding=0) uniform vs_params {
    mat4 mvp;
};

in vec4 position;
in vec3 normal0;
in vec4 color0;

out vec4 color;
out vec3 normal;

void main() {
    gl_Position = mvp * position;
    normal = normal0;
    color = color0;
}
@end

@fs fs
in vec4 color;
in vec3 normal;
out vec4 frag_color;

void main() {
    // Простое освещение по нормалям
    vec3 light_dir = normalize(vec3(0.5, 1.0, 0.3));
    vec3 norm = normalize(normal);
    float diff = max(dot(norm, light_dir), 0.0);
    
    // Ambient + diffuse
    float ambient = 0.3;
    float lighting = ambient + diff * 0.7;
    
    frag_color = vec4(color.rgb * lighting, color.a);
}
@end

@program scene vs fs