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#version 440
layout(location = 0) in vec2 v_texcoord;
layout(location = 1) in vec4 v_color;
layout(location = 0) out vec4 fragColor;
layout(std140, binding = 0) uniform buf {
mat4 mvp;
float opacity;
// Windows HDR: set to SDR_white_level_in_nits / 80
// macOS/iOS EDR: set to 1.0
// No HDR: set to 0.0, will do linear to sRGB at the end then.
float hdrWhiteLevelMult;
};
layout(binding = 1) uniform sampler2D tex;
vec3 linearToSRGB(vec3 color)
{
vec3 S1 = sqrt(color);
vec3 S2 = sqrt(S1);
vec3 S3 = sqrt(S2);
return 0.585122381 * S1 + 0.783140355 * S2 - 0.368262736 * S3;
}
void main()
{
vec4 c = v_color * texture(tex, v_texcoord);
c.a *= opacity;
if (hdrWhiteLevelMult > 0.0)
c.rgb *= hdrWhiteLevelMult;
else
c.rgb = linearToSRGB(c.rgb);
c.rgb *= c.a; // premultiplied alpha
fragColor = c;
}