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https://github.com/italicsjenga/slang-shaders.git
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46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
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#ifndef MONCURVE
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#define MONCURVE
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float moncurve_f( float color, float gamma, float offs)
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{
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// Forward monitor curve
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color = clamp(color, 0.0, 1.0);
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float fs = (( gamma - 1.0) / offs) * pow( offs * gamma / ( ( gamma - 1.0) * ( 1.0 + offs)), gamma);
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float xb = offs / ( gamma - 1.0);
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color = ( color > xb) ? pow( ( color + offs) / ( 1.0 + offs), gamma) : color * fs;
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return color;
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}
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vec3 moncurve_f_f3( vec3 color, float gamma, float offs)
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{
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color.r = moncurve_f( color.r, gamma, offs);
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color.g = moncurve_f( color.g, gamma, offs);
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color.b = moncurve_f( color.b, gamma, offs);
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return color.rgb;
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}
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float moncurve_r( float color, float gamma, float offs)
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{
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// Reverse monitor curve
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color = clamp(color, 0.0, 1.0);
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float yb = pow( offs * gamma / ( ( gamma - 1.0) * ( 1.0 + offs)), gamma);
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float rs = pow( ( gamma - 1.0) / offs, gamma - 1.0) * pow( ( 1.0 + offs) / gamma, gamma);
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color = ( color > yb) ? ( 1.0 + offs) * pow( color, 1.0 / gamma) - offs : color * rs;
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return color;
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}
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vec3 moncurve_r_f3( vec3 color, float gamma, float offs)
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{
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color.r = moncurve_r( color.r, gamma, offs);
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color.g = moncurve_r( color.g, gamma, offs);
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color.b = moncurve_r( color.b, gamma, offs);
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return color.rgb;
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}
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#endif
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