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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#version 440
#extension GL_GOOGLE_include_directive : enable
#include "uniformbuffer.glsl"
#include "colortransfer.glsl"
#include "colorconvert.glsl"
#include "hdrtonemapper.glsl"
#include "texturecomponent.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;
//
// Tonemapping into the RGB range supported by the output is done using
//
// masteringWhite in PQ values, not in linear. maxOutLum as defined in the doc above
// we assume that masteringBlack == 0, and minLum == 0 to simplify the calculations
//
// The calculation calculates a new luminosity in non linear space and scales the UV
// components before linearizing. This corresponds to option (2) at the end of section 5.4.
// This option was chosen as it keeps the colors correct while as well as being computationally
// cheapest.
void main()
{
float Y = getR16(plane1Texture, texCoord, ubuf.plane1Format, 1);
vec2 UV = getRG16(plane2Texture, texCoord, ubuf.plane2Format);
// 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 = convertPQToLinear(fragColor);
fragColor = convertRec2020ToSRGB(fragColor);
fragColor *= ubuf.opacity;
#ifndef QMM_OUTPUTSURFACE_LINEAR
fragColor = convertSRGBFromLinear(fragColor);
#endif
}