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filters/color-grading: Fix Gamma function and improve code readability
Fixes #510
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1 changed files with 20 additions and 15 deletions
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@ -55,10 +55,7 @@ float3 grade_lift(float3 v) { // same as grade_offset?
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};
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float3 grade_gamma(float3 v) {
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float3 s = sign(v); // Store sign for later use.
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float3 u = abs(v); // Remove sign
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u.rgb = pow(pow(u.rgb, pGamma.rgb), pGamma.a);
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return u * s; // Restore sign.
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return pow(abs(v), pGamma.rgb * pGamma.a) * sign(v);
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};
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float3 grade_gain(float3 v) {
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@ -112,22 +109,30 @@ float3 grade_colorcorrection(float3 v) {
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v1.b *= pCorrection.b; // Lightness Multiplier
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float3 v2 = HSVtoRGB(v1);
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// Contrast
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v2.rgb = ((v2.rgb - 0.5) * max(pCorrection.a, 0)) + 0.5;
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return v2;
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};
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float3 grade_contrast(float3 v) {
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v -= .5;
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v *= pCorrection.a;
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v += .5;
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return v;
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}
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float4 PSDraw(VertexData vtx) : TARGET {
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float4 v1 = image.Sample(PointClampSampler, vtx.uv);
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float3 v2 = grade_lift(v1.rgb);
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float3 v3 = grade_gamma(v2);
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float3 v4 = grade_gain(v3);
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float3 v5 = grade_offset(v4);
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float3 v6 = grade_tint(v5);
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float3 v7 = grade_colorcorrection(v6);
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float3 vf = v7;
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return float4(vf, v1.a);
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float4 vo = image.Sample(PointClampSampler, vtx.uv);
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float3 v = vo.rgb;
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v = grade_lift(v);
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v = grade_gamma(v);
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v = grade_gain(v);
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v = grade_offset(v);
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v = grade_tint(v);
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v = grade_colorcorrection(v);
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v = grade_contrast(v);
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return float4(v, vo.a);
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};
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technique Draw
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