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color-management: parametrize bt1886

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This commit is contained in:
Julian Orth 2025-09-08 20:37:47 +02:00
parent c37567f1cd
commit ef1727a186
8 changed files with 189 additions and 85 deletions
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27
src/gfx_apis/vulkan/shaders/eotfs.glsl
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@ -6,7 +6,7 @@
#define TF_LINEAR 1
#define TF_ST2084_PQ 2
#define TF_GAMMA24 3
#define TF_BT1886 3
#define TF_GAMMA22 4
#define TF_GAMMA28 5
#define TF_ST240 6
@ -14,6 +14,25 @@
#define TF_LOG316 9
#define TF_ST428 10
#define TF_POW 11
#define TF_GAMMA24 12
vec3 eotf_bt1886(vec3 c) {
c = clamp(c, 0.0, 1.0);
float a1 = cm_eotf_args.arg1;
float a2 = cm_eotf_args.arg2;
float a3 = cm_eotf_args.arg3;
float a4 = cm_eotf_args.arg4;
return a1 * (pow(a2 * c + a3, vec3(2.4)) - a4);
}
vec3 inv_eotf_bt1886(vec3 c) {
c = clamp(c, 0.0, 1.0);
float a1 = cm_inv_eotf_args.arg1;
float a2 = cm_inv_eotf_args.arg2;
float a3 = cm_inv_eotf_args.arg3;
float a4 = cm_inv_eotf_args.arg4;
return a1 * (pow(a2 * c + a3, vec3(1.0 / 2.4)) - a4);
}
vec3 eotf_st2084_pq(vec3 c) {
c = clamp(c, 0.0, 1.0);
@ -86,8 +105,9 @@ vec3 apply_eotf(vec3 c) {
switch (eotf) {
case TF_LINEAR: return c;
case TF_ST2084_PQ: return eotf_st2084_pq(c);
case TF_GAMMA24: return sign(c) * pow(abs(c), vec3(2.4));
case TF_BT1886: return eotf_bt1886(c);
case TF_GAMMA22: return sign(c) * pow(abs(c), vec3(2.2));
case TF_GAMMA24: return sign(c) * pow(abs(c), vec3(2.4));
case TF_GAMMA28: return sign(c) * pow(abs(c), vec3(2.8));
case TF_ST240: return eotf_st240(c);
case TF_LOG100: return eotf_log100(c);
@ -102,8 +122,9 @@ vec3 apply_inv_eotf(vec3 c) {
switch (inv_eotf) {
case TF_LINEAR: return c;
case TF_ST2084_PQ: return inv_eotf_st2084_pq(c);
case TF_GAMMA24: return sign(c) * pow(abs(c), vec3(1.0 / 2.4));
case TF_BT1886: return inv_eotf_bt1886(c);
case TF_GAMMA22: return sign(c) * pow(abs(c), vec3(1.0 / 2.2));
case TF_GAMMA24: return sign(c) * pow(abs(c), vec3(1.0 / 2.4));
case TF_GAMMA28: return sign(c) * pow(abs(c), vec3(1.0 / 2.8));
case TF_ST240: return inv_eotf_st240(c);
case TF_LOG100: return inv_eotf_log100(c);