#ifndef __EYE_ADAPTATION__
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#define __EYE_ADAPTATION__
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// Optimal values for PS4/GCN
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// Using a group size of 32x32 seems to be a bit faster on Kepler/Maxwell
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// Don't forget to update 'EyeAdaptationController.cs' if you change these values !
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#define HISTOGRAM_BINS 64
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#define HISTOGRAM_TEXELS HISTOGRAM_BINS / 4
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#define HISTOGRAM_THREAD_X 16
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#define HISTOGRAM_THREAD_Y 16
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float GetHistogramBinFromLuminance(float value, float2 scaleOffset)
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{
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return saturate(log2(value) * scaleOffset.x + scaleOffset.y);
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}
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float GetLuminanceFromHistogramBin(float bin, float2 scaleOffset)
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{
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return exp2((bin - scaleOffset.y) / scaleOffset.x);
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}
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#endif // __EYE_ADAPTATION__
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