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render/vulkan: 3D LUT fallback for texture pass color transform

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This commit is contained in:
Félix Poisot 2026-02-05 20:14:53 +00:00
parent bf8b6a7127
commit 611e0649c5
4 changed files with 140 additions and 53 deletions
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9
render/vulkan/shaders/texture.frag
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@ -2,6 +2,8 @@
layout(set = 0, binding = 0) uniform sampler2D tex;
layout(set = 1, binding = 0) uniform sampler3D lut_3d;
layout(location = 0) in vec2 uv;
layout(location = 0) out vec4 out_color;
@ -9,6 +11,8 @@ layout(location = 0) out vec4 out_color;
layout(push_constant, row_major) uniform UBO {
layout(offset = 80) mat4 matrix;
float alpha;
float lut_3d_offset;
float lut_3d_scale;
} data;
layout (constant_id = 0) const int TEXTURE_TRANSFORM = 0;
@ -19,6 +23,7 @@ layout (constant_id = 0) const int TEXTURE_TRANSFORM = 0;
#define TEXTURE_TRANSFORM_ST2084_PQ 2
#define TEXTURE_TRANSFORM_GAMMA22 3
#define TEXTURE_TRANSFORM_BT1886 4
#define TEXTURE_TRANSFORM_LUT_3D 5
float srgb_channel_to_linear(float x) {
return mix(x / 12.92,
@ -79,6 +84,10 @@ void main() {
rgb = pow(rgb, vec3(2.2));
} else if (TEXTURE_TRANSFORM == TEXTURE_TRANSFORM_BT1886) {
rgb = bt1886_color_to_linear(rgb);
} else if (TEXTURE_TRANSFORM == TEXTURE_TRANSFORM_LUT_3D) {
// Apply 3D LUT
vec3 pos = data.lut_3d_offset + rgb * data.lut_3d_scale;
rgb = texture(lut_3d, pos).rgb;
}
rgb = mat3(data.matrix) * rgb;