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blender-archive/source/blender/gpu/shaders/gpu_shader_simple_lighting_frag.glsl

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#ifndef USE_INSTANCE_COLOR
uniform vec4 color;
#endif
uniform vec3 light;
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in vec3 normal;
#ifdef USE_INSTANCE_COLOR
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flat in vec4 finalColor;
# define color finalColor
#endif
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out vec4 fragColor;
void main()
{
fragColor = color;
fragColor.xyz *= clamp(dot(normalize(normal), light), 0.0, 1.0);
}