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render: introduce Gamma 2.2 color transform

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This commit is contained in:
Félix Poisot 2025-08-17 15:51:26 +00:00
parent 6978509f64
commit c2d9ae2142
9 changed files with 31 additions and 1 deletions
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3
render/vulkan/shaders/output.frag
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@ -22,6 +22,7 @@ layout (constant_id = 0) const int OUTPUT_TRANSFORM = 0;
#define OUTPUT_TRANSFORM_INVERSE_SRGB 1
#define OUTPUT_TRANSFORM_INVERSE_ST2084_PQ 2
#define OUTPUT_TRANSFORM_LUT_3D 3
#define OUTPUT_TRANSFORM_INVERSE_GAMMA22 4
float linear_channel_to_srgb(float x) {
return max(min(x * 12.92, 0.04045), 1.055 * pow(x, 1. / 2.4) - 0.055);
@ -71,6 +72,8 @@ void main() {
} else if (OUTPUT_TRANSFORM == OUTPUT_TRANSFORM_INVERSE_SRGB) {
// Produce sRGB encoded values
rgb = linear_color_to_srgb(rgb);
} else if (OUTPUT_TRANSFORM == OUTPUT_TRANSFORM_INVERSE_GAMMA22) {
rgb = pow(rgb, vec3(1. / 2.2));
}
// Back to pre-multiplied alpha