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Diffstat (limited to 'Studio/Content/Effect Library/SCurveTonemap.effect')
| -rw-r--r-- | Studio/Content/Effect Library/SCurveTonemap.effect | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/Studio/Content/Effect Library/SCurveTonemap.effect b/Studio/Content/Effect Library/SCurveTonemap.effect new file mode 100644 index 0000000..fc0259b --- /dev/null +++ b/Studio/Content/Effect Library/SCurveTonemap.effect @@ -0,0 +1,117 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Effect> + <MetaData> + <Property name="Shoulder" formalName="Shoulder Slope" type="Float" default="1" min="0" max="3"/> + <Property name="ShoulderWt" formalName="Shoulder Emphasis" type="Float" default="0" min="-1" max="1"/> + <Property name="Toe" formalName="Toe Slope" type="Float" default="1" min="0" max="3"/> + <Property name="ToeWt" formalName="Toe Emphasis" type="Float" default="0" min="-1" max="1"/> + <Property name="Contrast" formalName="Contrast Boost" type="Float" default="0" min="-1" max="2"/> + <Property name="Saturation" formalName="Saturation Level" type="Float" default="1" min="0" max="2"/> + <Property name="GammaValue" formalName="Gamma" type="Float" default="2.2" min="0.1" max="8"/> + <Property name="UseExposure" formalName="Use Exposure" type="Boolean" default="False"/> + <Property name="WhiteVal" formalName="White Point" type="Float" default="1.0" min="0.01" max="128.0"> + <ShowIfEqual property="UseExposure" value="False"/> + </Property> + <Property name="ExposeVal" formalName="Exposure Value" type="Float" default="1.0" min="0.01" max="16.0"> + <ShowIfEqual property="UseExposure" value="True"/> + </Property> + </MetaData> + <Shaders> + <Shared> +#include "luminance.glsllib" + +float remapLum( float inLum, float whitePt ) +{ + return clamp( inLum / whitePt, 0.0, 1.0 ); +} + +float exposeLum( float inLum, float exposure ) +{ + return 1.0 - exp2( -inLum / exposure ); +} + +vec3 gammaCorrect( vec3 inColor, float gammaExp ) +{ + return pow( inColor, vec3( 1.0 / gammaExp ) ); +} + +vec3 adjSaturation( vec3 inRGB, float satFactor ) +{ + // Must be done in linear space (before gamma correction) + float P = sqrt( luminance( inRGB * inRGB ) ); + vec3 outCol; + outCol = (inRGB - vec3(P)) * satFactor; + outCol += vec3(P); + return outCol; +} + + </Shared> +<Shader name="TONEMAP"> +<FragmentShader> +float curveCompute( float inLum, float slope0, float slope1 ) +{ + float a1 = slope0; + float a2 = 3.0 - 2.0 * slope0 - slope1; + float a3 = slope1 + slope0 - 2.0; + + // Cubic curve fit. This results in a curve that is 0 where inColor is 0 + // equals 1 when inColor is 1, and the derivative at 0 is slope0 and the + // derivative at 1 is slope1 + return ((((a3 * inLum) + a2)*inLum) + a1)*inLum; +} + +float toeEmphasize( float inParam ) +{ + float a1 = 1.0 - ToeWt; + float a2 = 2.0 * ToeWt; + float a3 = -ToeWt; + + return ((((a3 * inParam) + a2) * inParam) + a1) * inParam; +} + +float shoulderEmphasize( float inParam ) +{ + float a1 = 1.0; + float a2 = ShoulderWt; + float a3 = -ShoulderWt; + + return ((((a3 * inParam) + a2) * inParam) + a1) * inParam; +} + +void frag() +{ + // k = shadow slope, m = midtone slope, n = highlight slope + float k = Toe; + float m = 1.0 + Contrast; + float n = Shoulder; + + //vec4 sourceColor = texture(SourceSampler, TexCoord); + vec4 sourceColor = texture(Texture0, TexCoord); + vec3 sourceSep = RGBToYPbPr(sourceColor.rgb); + + float lum = sourceSep.r; + + if (UseExposure) + lum = exposeLum( lum, ExposeVal ); + else + lum = remapLum( lum, WhiteVal ); + + float param0 = toeEmphasize( 2.0 * lum ); // Parametrization for Curve Part 1 + float param1 = shoulderEmphasize( 2.0 * lum - 1.0 ); // Parametrization for Curve Part 2 + + float lum0 = 0.5 * curveCompute( param0, k, m ); + float lum1 = 0.5 * curveCompute( param1, m, n ) + 0.5; + sourceSep.r = (lum > 0.5) ? lum1 : lum0; + + // Convert back to RGB and gamma correct + vec3 finalColor = YPbPrToRGB( sourceSep ); + finalColor = gammaCorrect( adjSaturation( finalColor, Saturation ), GammaValue ); + gl_FragColor = vec4( finalColor, sourceColor.a ); +} +</FragmentShader> +</Shader> + </Shaders> + <Passes> + <Pass shader="TONEMAP" input="[source]" /> + </Passes> +</Effect>
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