449 lines
17 KiB
C++
449 lines
17 KiB
C++
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// Copyright (C) 2023 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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// Test application for HDR with scRGB.
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// Launch with the argument "scrgb" or "sdr", perhaps side-by-side even.
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#define EXAMPLEFW_PREINIT
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#define EXAMPLEFW_IMGUI
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#include "../shared/examplefw.h"
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#include "../shared/cube.h"
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QByteArray loadHdr(const QString &fn, QSize *size)
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{
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QFile f(fn);
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if (!f.open(QIODevice::ReadOnly)) {
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qWarning("Failed to open %s", qPrintable(fn));
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return QByteArray();
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}
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char sig[256];
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f.read(sig, 11);
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if (strncmp(sig, "#?RADIANCE\n", 11))
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return QByteArray();
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QByteArray buf = f.readAll();
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const char *p = buf.constData();
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const char *pEnd = p + buf.size();
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// Process lines until the empty one.
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QByteArray line;
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while (p < pEnd) {
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char c = *p++;
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if (c == '\n') {
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if (line.isEmpty())
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break;
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if (line.startsWith(QByteArrayLiteral("FORMAT="))) {
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const QByteArray format = line.mid(7).trimmed();
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if (format != QByteArrayLiteral("32-bit_rle_rgbe")) {
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qWarning("HDR format '%s' is not supported", format.constData());
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return QByteArray();
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}
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}
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line.clear();
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} else {
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line.append(c);
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}
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}
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if (p == pEnd) {
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qWarning("Malformed HDR image data at property strings");
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return QByteArray();
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}
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// Get the resolution string.
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while (p < pEnd) {
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char c = *p++;
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if (c == '\n')
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break;
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line.append(c);
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}
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if (p == pEnd) {
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qWarning("Malformed HDR image data at resolution string");
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return QByteArray();
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}
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int w = 0, h = 0;
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// We only care about the standard orientation.
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if (!sscanf(line.constData(), "-Y %d +X %d", &h, &w)) {
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qWarning("Unsupported HDR resolution string '%s'", line.constData());
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return QByteArray();
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}
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if (w <= 0 || h <= 0) {
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qWarning("Invalid HDR resolution");
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return QByteArray();
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}
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// output is RGBA32F
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const int blockSize = 4 * sizeof(float);
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QByteArray data;
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data.resize(w * h * blockSize);
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typedef unsigned char RGBE[4];
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RGBE *scanline = new RGBE[w];
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for (int y = 0; y < h; ++y) {
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if (pEnd - p < 4) {
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qWarning("Unexpected end of HDR data");
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delete[] scanline;
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return QByteArray();
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}
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scanline[0][0] = *p++;
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scanline[0][1] = *p++;
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scanline[0][2] = *p++;
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scanline[0][3] = *p++;
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if (scanline[0][0] == 2 && scanline[0][1] == 2 && scanline[0][2] < 128) {
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// new rle, the first pixel was a dummy
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for (int channel = 0; channel < 4; ++channel) {
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for (int x = 0; x < w && p < pEnd; ) {
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unsigned char c = *p++;
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if (c > 128) { // run
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if (p < pEnd) {
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int repCount = c & 127;
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c = *p++;
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while (repCount--)
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scanline[x++][channel] = c;
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}
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} else { // not a run
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while (c-- && p < pEnd)
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scanline[x++][channel] = *p++;
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}
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}
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}
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} else {
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// old rle
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scanline[0][0] = 2;
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int bitshift = 0;
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int x = 1;
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while (x < w && pEnd - p >= 4) {
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scanline[x][0] = *p++;
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scanline[x][1] = *p++;
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scanline[x][2] = *p++;
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scanline[x][3] = *p++;
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if (scanline[x][0] == 1 && scanline[x][1] == 1 && scanline[x][2] == 1) { // run
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int repCount = scanline[x][3] << bitshift;
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while (repCount--) {
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memcpy(scanline[x], scanline[x - 1], 4);
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++x;
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}
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bitshift += 8;
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} else { // not a run
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++x;
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bitshift = 0;
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}
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}
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}
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// adjust for -Y orientation
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float *fp = reinterpret_cast<float *>(data.data() + (h - 1 - y) * blockSize * w);
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for (int x = 0; x < w; ++x) {
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float d = qPow(2.0f, float(scanline[x][3]) - 128.0f);
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float r = scanline[x][0] / 256.0f * d;
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float g = scanline[x][1] / 256.0f * d;
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float b = scanline[x][2] / 256.0f * d;
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float a = 1.0f;
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*fp++ = r;
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*fp++ = g;
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*fp++ = b;
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*fp++ = a;
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}
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}
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delete[] scanline;
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*size = QSize(w, h);
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return data;
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}
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struct {
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QMatrix4x4 winProj;
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QList<QRhiResource *> releasePool;
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QRhiResourceUpdateBatch *initialUpdates = nullptr;
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QRhiBuffer *vbuf = nullptr;
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QRhiBuffer *ubuf = nullptr;
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QRhiTexture *tex = nullptr;
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QRhiSampler *sampler = nullptr;
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QRhiShaderResourceBindings *srb = nullptr;
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QRhiGraphicsPipeline *ps = nullptr;
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bool showDemoWindow = true;
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QVector3D rotation;
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bool usingHDRWindow;
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bool adjustSDR = false;
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float SDRWhiteLevelInNits = 200.0f;
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bool tonemapHDR = false;
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float tonemapInMax = 2.5f;
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float tonemapOutMax = 0.0f;
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QString imageFile;
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} d;
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void preInit()
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{
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QStringList args = QCoreApplication::arguments();
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if (args.contains("scrgb")) {
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d.usingHDRWindow = true;
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swapchainFormat = QRhiSwapChain::HDRExtendedSrgbLinear;
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} else if (args.contains("sdr")) {
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d.usingHDRWindow = false;
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swapchainFormat = QRhiSwapChain::SDR;
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} else {
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qFatal("Missing command line argument, specify scrgb or sdr");
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}
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if (args.contains("file")) {
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d.imageFile = args[args.indexOf("file") + 1];
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qDebug("Using HDR image file %s", qPrintable(d.imageFile));
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} else {
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qFatal("Missing command line argument, specify 'file' followed by a .hdr file. "
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"Download for example the original .exr from https://viewer.openhdr.org/i/5fcb9a595812624a99d24c62/linear "
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"and use ImageMagick's 'convert' to convert from .exr to .hdr");
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}
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}
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void Window::customInit()
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{
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if (!m_r->isTextureFormatSupported(QRhiTexture::RGBA32F))
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qWarning("RGBA32F texture format is not supported");
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d.initialUpdates = m_r->nextResourceUpdateBatch();
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d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
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d.vbuf->create();
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d.releasePool << d.vbuf;
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d.initialUpdates->uploadStaticBuffer(d.vbuf, cube);
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d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 4 * 4);
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d.ubuf->create();
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d.releasePool << d.ubuf;
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qint32 flip = 1;
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d.initialUpdates->updateDynamicBuffer(d.ubuf, 64, 4, &flip);
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qint32 doLinearToSRGBInShader = !d.usingHDRWindow;
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d.initialUpdates->updateDynamicBuffer(d.ubuf, 68, 4, &doLinearToSRGBInShader);
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QSize size;
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QByteArray floatData = loadHdr(d.imageFile, &size);
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d.tex = m_r->newTexture(QRhiTexture::RGBA32F, size);
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d.releasePool << d.tex;
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d.tex->create();
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QRhiTextureUploadDescription desc({ 0, 0, { floatData.constData(), quint32(floatData.size()) } });
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d.initialUpdates->uploadTexture(d.tex, desc);
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d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
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QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
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d.releasePool << d.sampler;
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d.sampler->create();
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d.srb = m_r->newShaderResourceBindings();
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d.releasePool << d.srb;
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d.srb->setBindings({
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QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
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QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.tex, d.sampler)
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});
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d.srb->create();
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d.ps = m_r->newGraphicsPipeline();
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d.releasePool << d.ps;
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d.ps->setCullMode(QRhiGraphicsPipeline::Back);
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const QRhiShaderStage stages[] = {
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{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/hdrtexture.vert.qsb")) },
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{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/hdrtexture.frag.qsb")) }
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};
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d.ps->setShaderStages(stages, stages + 2);
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QRhiVertexInputLayout inputLayout;
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inputLayout.setBindings({
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{ 3 * sizeof(float) },
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{ 2 * sizeof(float) }
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});
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inputLayout.setAttributes({
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{ 0, 0, QRhiVertexInputAttribute::Float3, 0 },
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{ 1, 1, QRhiVertexInputAttribute::Float2, 0 }
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});
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d.ps->setVertexInputLayout(inputLayout);
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d.ps->setShaderResourceBindings(d.srb);
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d.ps->setRenderPassDescriptor(m_rp);
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d.ps->create();
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}
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void Window::customRelease()
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{
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qDeleteAll(d.releasePool);
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d.releasePool.clear();
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}
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void Window::customRender()
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{
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if (d.tonemapOutMax == 0.0f) {
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QRhiSwapChainHdrInfo info = m_sc->hdrInfo();
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switch (info.limitsType) {
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case QRhiSwapChainHdrInfo::LuminanceInNits:
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d.tonemapOutMax = info.limits.luminanceInNits.maxLuminance / 80.0f;
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break;
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case QRhiSwapChainHdrInfo::ColorComponentValue:
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// because on macOS it changes dynamically when starting up, so retry in next frame if it's still just 1.0
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if (info.limits.colorComponentValue.maxColorComponentValue > 1.0f)
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d.tonemapOutMax = info.limits.colorComponentValue.maxColorComponentValue;
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break;
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}
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}
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QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
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QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch();
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if (d.initialUpdates) {
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u->merge(d.initialUpdates);
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d.initialUpdates->release();
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d.initialUpdates = nullptr;
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}
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QMatrix4x4 mvp = m_proj;
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mvp.rotate(d.rotation.x(), 1, 0, 0);
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mvp.rotate(d.rotation.y(), 0, 1, 0);
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mvp.rotate(d.rotation.z(), 0, 0, 1);
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u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
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if (d.usingHDRWindow && d.tonemapHDR) {
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u->updateDynamicBuffer(d.ubuf, 72, 4, &d.tonemapInMax);
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u->updateDynamicBuffer(d.ubuf, 76, 4, &d.tonemapOutMax);
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} else {
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float zero[2] = {};
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u->updateDynamicBuffer(d.ubuf, 72, 8, zero);
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}
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QColor clearColor = Qt::green; // sRGB
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if (d.usingHDRWindow && d.adjustSDR) {
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float sdrMultiplier = d.SDRWhiteLevelInNits / 80.0f; // scRGB 1.0 = 80 nits (and linear gamma)
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clearColor = QColor::fromRgbF(clearColor.redF() * sdrMultiplier,
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clearColor.greenF() * sdrMultiplier,
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clearColor.blueF() * sdrMultiplier,
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1.0f);
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}
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const QSize outputSizeInPixels = m_sc->currentPixelSize();
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cb->beginPass(m_sc->currentFrameRenderTarget(), clearColor, { 1.0f, 0 }, u);
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cb->setGraphicsPipeline(d.ps);
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cb->setViewport(QRhiViewport(0, 0, outputSizeInPixels.width(), outputSizeInPixels.height()));
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cb->setShaderResources();
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const QRhiCommandBuffer::VertexInput vbufBindings[] = {
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{ d.vbuf, 0 },
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{ d.vbuf, quint32(36 * 3 * sizeof(float)) }
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};
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cb->setVertexInput(0, 2, vbufBindings);
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cb->draw(36);
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m_imguiRenderer->render();
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cb->endPass();
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}
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static void addTip(const char *s)
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{
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ImGui::SameLine();
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ImGui::TextDisabled("(?)");
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if (ImGui::IsItemHovered()) {
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ImGui::BeginTooltip();
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ImGui::PushTextWrapPos(300);
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ImGui::TextUnformatted(s);
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ImGui::PopTextWrapPos();
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ImGui::EndTooltip();
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}
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}
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void Window::customGui()
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|
|
{
|
||
|
|
ImGui::SetNextWindowBgAlpha(1.0f);
|
||
|
|
ImGui::SetNextWindowPos(ImVec2(10, 420), ImGuiCond_FirstUseEver);
|
||
|
|
ImGui::SetNextWindowSize(ImVec2(800, 300), ImGuiCond_FirstUseEver);
|
||
|
|
ImGui::Begin("HDR test");
|
||
|
|
|
||
|
|
if (d.usingHDRWindow) {
|
||
|
|
ImGui::Text("The window is now scRGB (extended *linear* sRGB) + FP16 color buffer,\n"
|
||
|
|
"the ImGui UI and the green background are considered SDR content,\n"
|
||
|
|
"the cube is using a HDR texture.");
|
||
|
|
ImGui::Checkbox("Adjust SDR content", &d.adjustSDR);
|
||
|
|
addTip("Multiplies fragment colors for non-HDR content with sdr_white_level / 80. "
|
||
|
|
"Not relevant with macOS (due to EDR being display-referred).");
|
||
|
|
if (d.adjustSDR) {
|
||
|
|
ImGui::SliderFloat("SDR white level (nits)", &d.SDRWhiteLevelInNits, 0.0f, 1000.0f);
|
||
|
|
imguiHDRMultiplier = d.SDRWhiteLevelInNits / 80.0f; // scRGB 1.0 = 80 nits (and linear gamma)
|
||
|
|
} else {
|
||
|
|
imguiHDRMultiplier = 1.0f; // 0 would mean linear to sRGB; don't want that with HDR
|
||
|
|
}
|
||
|
|
ImGui::Separator();
|
||
|
|
ImGui::Checkbox("Tonemap HDR content", &d.tonemapHDR);
|
||
|
|
addTip("Perform some most basic Reinhard tonemapping (changed to suit HDR) on the 3D content (the cube). "
|
||
|
|
"Display max luminance is set to the max color component value (macOS) or max luminance in nits / 80 (Windows) by default.");
|
||
|
|
if (d.tonemapHDR) {
|
||
|
|
ImGui::SliderFloat("Content max luminance\n(color component value)", &d.tonemapInMax, 0.0f, 20.0f);
|
||
|
|
ImGui::SliderFloat("Display max luminance\n(color component value)", &d.tonemapOutMax, 0.0f, 20.0f);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
ImGui::Text("The window is standard dynamic range (no HDR, so non-linear sRGB effectively).\n"
|
||
|
|
"Here we just do linear -> sRGB for everything (UI, textured cube)\n"
|
||
|
|
"at the end of the pipeline, while the Qt::green background is already sRGB.");
|
||
|
|
}
|
||
|
|
|
||
|
|
ImGui::End();
|
||
|
|
|
||
|
|
ImGui::SetNextWindowPos(ImVec2(850, 560), ImGuiCond_FirstUseEver);
|
||
|
|
ImGui::SetNextWindowSize(ImVec2(420, 140), ImGuiCond_FirstUseEver);
|
||
|
|
ImGui::Begin("Misc");
|
||
|
|
float *rot = reinterpret_cast<float *>(&d.rotation);
|
||
|
|
ImGui::SliderFloat("Rotation X", &rot[0], 0.0f, 360.0f);
|
||
|
|
ImGui::SliderFloat("Rotation Y", &rot[1], 0.0f, 360.0f);
|
||
|
|
ImGui::SliderFloat("Rotation Z", &rot[2], 0.0f, 360.0f);
|
||
|
|
ImGui::End();
|
||
|
|
|
||
|
|
if (d.usingHDRWindow) {
|
||
|
|
ImGui::SetNextWindowPos(ImVec2(850, 10), ImGuiCond_FirstUseEver);
|
||
|
|
ImGui::SetNextWindowSize(ImVec2(420, 180), ImGuiCond_FirstUseEver);
|
||
|
|
ImGui::Begin("Actual platform info");
|
||
|
|
QRhiSwapChainHdrInfo info = m_sc->hdrInfo();
|
||
|
|
switch (info.limitsType) {
|
||
|
|
case QRhiSwapChainHdrInfo::LuminanceInNits:
|
||
|
|
ImGui::Text("Platform provides luminance in nits");
|
||
|
|
addTip("Windows/D3D: On laptops this will be screen brightness dependent. Increasing brightness implies the max luminance decreases. "
|
||
|
|
"It also seems to be affected by HDR Content Brightness in the Settings, if there is one (e.g. on laptops; not to be confused with SDR Content Brightess). "
|
||
|
|
"(note that the DXGI query does not seem to return changed values if there are runtime changes unless restarting the app).");
|
||
|
|
ImGui::Text("Min luminance: %.4f\nMax luminance: %.4f",
|
||
|
|
info.limits.luminanceInNits.minLuminance,
|
||
|
|
info.limits.luminanceInNits.maxLuminance);
|
||
|
|
break;
|
||
|
|
case QRhiSwapChainHdrInfo::ColorComponentValue:
|
||
|
|
ImGui::Text("Platform provides color component values");
|
||
|
|
addTip("macOS/Metal: On laptops this will be screen brightness dependent. Increasing brightness decreases the max color value. "
|
||
|
|
"Max brightness may bring it down to 1.0.");
|
||
|
|
ImGui::Text("maxColorComponentValue: %.4f\nmaxPotentialColorComponentValue: %.4f",
|
||
|
|
info.limits.colorComponentValue.maxColorComponentValue,
|
||
|
|
info.limits.colorComponentValue.maxPotentialColorComponentValue);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
ImGui::Separator();
|
||
|
|
switch (info.luminanceBehavior) {
|
||
|
|
case QRhiSwapChainHdrInfo::SceneReferred:
|
||
|
|
ImGui::Text("Luminance behavior is scene-referred");
|
||
|
|
break;
|
||
|
|
case QRhiSwapChainHdrInfo::DisplayReferred:
|
||
|
|
ImGui::Text("Luminance behavior is display-referred");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
addTip("Windows (DWM) HDR is scene-referred: 1.0 = 80 nits.\n\n"
|
||
|
|
"Apple EDR is display-referred: the value of 1.0 refers to whatever the system's current SDR white level is (100, 200, ... nits depending on the brightness).");
|
||
|
|
if (info.luminanceBehavior == QRhiSwapChainHdrInfo::SceneReferred) {
|
||
|
|
ImGui::Text("SDR white level: %.4f nits", info.sdrWhiteLevel);
|
||
|
|
addTip("On Windows this is queried from DISPLAYCONFIG_SDR_WHITE_LEVEL. "
|
||
|
|
"Affected by the slider in the Windows Settings (System/Display/HDR/[S|H]DR Content Brightness). "
|
||
|
|
"With max screen brightness (laptops) the value will likely be the same as the max luminance.");
|
||
|
|
}
|
||
|
|
ImGui::End();
|
||
|
|
}
|
||
|
|
}
|