65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
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//=================================================================================================
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//Gamma Correction
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//=================================================================================================
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//#define USE_STRICT_GAMMA_CORRECTION //use gamma correction for sky blending, might distort the original colors
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//=================================================================================================
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float LinearTosRGB(float gammaPre)
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{
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/*
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float Low = gammaPre * 12.92;
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float High = (pow(gammaPre, 1.0 / 2.4) * 1.055) - 0.055;
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return (gammaPre <= 0.0031308) ? Low : High;
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*/
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//return (gammaPre <= 0.00313080495356037151702786377709) ? gammaPre * 12.92 : (1.055 * pow(gammaPre, 0.41666666666666666666666666666667) - 0.055);
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//return max(1.055 * pow(gammaPre, 0.416666667) - 0.055, 0.0);
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//Cheap sRGB doesn't cause clipping
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return pow(gammaPre, 0.45454545);
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}
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float3 LinearTosRGB(float3 gammaPre)
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{
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gammaPre = max(0.0, gammaPre);
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float3 gammaPost = float3(
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LinearTosRGB(gammaPre.r),
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LinearTosRGB(gammaPre.g),
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LinearTosRGB(gammaPre.b));
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return gammaPost;
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}
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/*
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float4 LinearTosRGB(float4 gammaPre)
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{
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return float4(LinearTosRGB(gammaPre.rgb), gammaPre.a);
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}
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*/
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float SRGBToLinear(float gammaPre)
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{
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/*
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float Low = gammaPre / 12.92;
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float High = pow((gammaPre + 0.055) / 1.055, 2.4);
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return(gammaPre <= 0.04045) ? Low : High;
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*/
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//return (gammaPre <= 0.04045) ? gammaPre * 0.07739938080495356037151702786378 : pow((gammaPre + 0.055) * 0.94786729857819905213270142180095, 2.4);
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//return gammaPre * (gammaPre * (gammaPre * 0.305306011 + 0.682171111) + 0.012522878);
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//Cheap sRGB doesn't cause clipping
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return pow(gammaPre, 2.2);
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}
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float3 SRGBToLinear(float3 gammaPre)
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{
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gammaPre = max(0.0, gammaPre);
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float3 gammaPost = float3(
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SRGBToLinear(gammaPre.r),
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SRGBToLinear(gammaPre.g),
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SRGBToLinear(gammaPre.b));
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return gammaPost;
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}
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/*
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float4 SRGBToLinear(float4 gammaPre)
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{
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return float4(SRGBToLinear(gammaPre.rgb), gammaPre.a);
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}
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*/
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#include "tonemap_srgb.h"
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