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libobs: Reduce PQ shader math

master
jpark37 2022-05-08 15:33:47 -07:00 committed by Jim
parent 2a0d8d1c9c
commit 0f53dc28bb
1 changed files with 4 additions and 2 deletions
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6
libobs/data/color.effect
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@ -46,7 +46,8 @@ float3 reinhard(float3 rgb)
float linear_to_st2084_channel(float x)
{
return pow((0.8359375 + 18.8515625 * pow(abs(x), 0.1593017578)) / (1. + 18.6875 * pow(abs(x), 0.1593017578)), 78.84375);
float common = pow(abs(x), 0.1593017578);
return pow((0.8359375 + 18.8515625 * common) / (1. + 18.6875 * common), 78.84375);
}
float3 linear_to_st2084(float3 rgb)
@ -56,7 +57,8 @@ float3 linear_to_st2084(float3 rgb)
float st2084_to_linear_channel(float u)
{
return pow(abs(max(pow(abs(u), 1. / 78.84375) - 0.8359375, 0.) / (18.8515625 - 18.6875 * pow(abs(u), 1. / 78.84375))), 1. / 0.1593017578);
float common = pow(abs(u), 1. / 78.84375);
return pow(abs(max(common - 0.8359375, 0.) / (18.8515625 - 18.6875 * common)), 1. / 0.1593017578);
}
float3 st2084_to_linear(float3 v)