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render/vulkan: add support for PQ for textures

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This commit is contained in:
Simon Ser 2025-02-27 16:37:00 +01:00
parent 3a51a5c623
commit a8144088df
3 changed files with 38 additions and 7 deletions
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14
render/vulkan/shaders/texture.frag
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@ -16,6 +16,7 @@ layout (constant_id = 0) const int TEXTURE_TRANSFORM = 0;
// Matches enum wlr_vk_texture_transform
#define TEXTURE_TRANSFORM_IDENTITY 0
#define TEXTURE_TRANSFORM_SRGB 1
#define TEXTURE_TRANSFORM_ST2084_PQ 2
float srgb_channel_to_linear(float x) {
return mix(x / 12.92,
@ -31,6 +32,17 @@ vec3 srgb_color_to_linear(vec3 color) {
);
}
vec3 pq_color_to_linear(vec3 color) {
float inv_m1 = 1 / 0.1593017578125;
float inv_m2 = 1 / 78.84375;
float c1 = 0.8359375;
float c2 = 18.8515625;
float c3 = 18.6875;
vec3 num = max(pow(color, vec3(inv_m2)) - c1, 0);
vec3 denom = c2 - c3 * pow(color, vec3(inv_m2));
return pow(num / denom, vec3(inv_m1));
}
void main() {
vec4 in_color = textureLod(tex, uv, 0);
@ -45,6 +57,8 @@ void main() {
if (TEXTURE_TRANSFORM == TEXTURE_TRANSFORM_SRGB) {
rgb = srgb_color_to_linear(rgb);
} else if (TEXTURE_TRANSFORM == TEXTURE_TRANSFORM_ST2084_PQ) {
rgb = pq_color_to_linear(rgb);
}
rgb = mat3(data.matrix) * rgb;