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/* -------------------------------------------------------------------- */
/** \name YCoCg
* \{ */
vec3 colorspace_YCoCg_from_scene_linear(vec3 rgb_color)
{
const mat3 colorspace_tx = transpose(mat3(vec3(1, 2, 1), /* Y */
vec3(2, 0, -2), /* Co */
vec3(-1, 2, -1))); /* Cg */
return colorspace_tx * rgb_color;
}
vec4 colorspace_YCoCg_from_scene_linear(vec4 rgba_color)
{
return vec4(colorspace_YCoCg_from_scene_linear(rgba_color.rgb), rgba_color.a);
}
vec3 colorspace_scene_linear_from_YCoCg(vec3 ycocg_color)
{
float Y = ycocg_color.x;
float Co = ycocg_color.y;
float Cg = ycocg_color.z;
vec3 rgb_color;
rgb_color.r = Y + Co - Cg;
rgb_color.g = Y + Cg;
rgb_color.b = Y - Co - Cg;
return rgb_color * 0.25;
}
vec4 colorspace_scene_linear_from_YCoCg(vec4 ycocg_color)
{
return vec4(colorspace_scene_linear_from_YCoCg(ycocg_color.rgb), ycocg_color.a);
}
/** \} */
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