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#version 440
#extension GL_GOOGLE_include_directive : enable
#include "uniformbuffer.glsl"
#include "colortransfer.glsl"
#include "colorconvert.glsl"
#include "hdrtonemapper.glsl"
layout(location = 0) in vec2 texCoord;
layout(location = 0) out vec4 fragColor;
layout(binding = 1) uniform sampler2D plane1Texture;
layout(binding = 2) uniform sampler2D plane2Texture;
// This implements support HDR video using the HLG transfer functions, see also
// https://en.wikipedia.org/wiki/Hybrid_log–gamma
// https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2390-6-2019-PDF-E.pdf
// https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.2100-2-201807-I!!PDF-E.pdf
//
// Tonemapping is done using the same algorithm as for the PQ transfer function, but we
// operate in HLG space here.
void main()
{
float Y = texture(plane1Texture, texCoord).r;
vec2 UV = texture(plane2Texture, texCoord).rg;
// map to Rec.2020 color space
fragColor = vec4(Y, UV.x, UV.y, 1.);
fragColor = ubuf.colorMatrix * fragColor;
// tonemap
float y = (Y - 16./256.)*256./219.; // Video range (16...235)
float scale = tonemapScaleForLuminosity(y, ubuf.masteringWhite, ubuf.maxLum);
fragColor *= scale;
fragColor = convertHLGToLinear(fragColor, ubuf.maxLum);
fragColor = convertRec2020ToSRGB(fragColor);
fragColor *= ubuf.opacity;
#ifndef QMM_OUTPUTSURFACE_LINEAR
fragColor = convertSRGBFromLinear(fragColor);
#endif
}
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