mirror of
https://github.com/crystalidea/qt6windows7.git
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309 lines
9.1 KiB
C++
309 lines
9.1 KiB
C++
// Copyright (C) 2018 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include <QGuiApplication>
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#include <QImage>
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#include <QFileInfo>
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#include <QFile>
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#include <QLoggingCategory>
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#include <QCommandLineParser>
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#include <QtGui/private/qshader_p.h>
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#include <QtGui/private/qrhinull_p.h>
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#ifndef QT_NO_OPENGL
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#include <QtGui/private/qrhigles2_p.h>
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#include <QOffscreenSurface>
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#endif
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#if QT_CONFIG(vulkan)
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#include <QLoggingCategory>
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#include <QtGui/private/qrhivulkan_p.h>
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#endif
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#ifdef Q_OS_WIN
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#include <QtGui/private/qrhid3d11_p.h>
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#endif
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#if defined(Q_OS_MACOS) || defined(Q_OS_IOS)
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#include <QtGui/private/qrhimetal_p.h>
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#endif
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//#define TEST_FINISH
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static float vertexData[] = { // Y up (note m_proj), CCW
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0.0f, 0.5f, 1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, -0.5f, 0.0f, 0.0f, 1.0f,
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};
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static QShader getShader(const QString &name)
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{
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QFile f(name);
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if (f.open(QIODevice::ReadOnly))
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return QShader::fromSerialized(f.readAll());
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return QShader();
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}
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enum GraphicsApi
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{
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OpenGL,
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Vulkan,
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D3D11,
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Metal,
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Null
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};
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GraphicsApi graphicsApi;
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QString graphicsApiName()
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{
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switch (graphicsApi) {
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case OpenGL:
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return QLatin1String("OpenGL 2.x");
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case Vulkan:
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return QLatin1String("Vulkan");
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case D3D11:
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return QLatin1String("Direct3D 11");
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case Metal:
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return QLatin1String("Metal");
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case Null:
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return QLatin1String("Null");
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default:
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break;
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}
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return QString();
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}
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int main(int argc, char **argv)
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{
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QGuiApplication app(argc, argv);
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#if defined(Q_OS_WIN)
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graphicsApi = D3D11;
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#elif defined(Q_OS_MACOS) || defined(Q_OS_IOS)
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graphicsApi = Metal;
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#elif QT_CONFIG(vulkan)
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graphicsApi = Vulkan;
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#else
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graphicsApi = OpenGL;
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#endif
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QCommandLineParser cmdLineParser;
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cmdLineParser.addHelpOption();
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QCommandLineOption glOption({ "g", "opengl" }, QLatin1String("OpenGL (2.x)"));
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cmdLineParser.addOption(glOption);
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QCommandLineOption vkOption({ "v", "vulkan" }, QLatin1String("Vulkan"));
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cmdLineParser.addOption(vkOption);
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QCommandLineOption d3dOption({ "d", "d3d11" }, QLatin1String("Direct3D 11"));
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cmdLineParser.addOption(d3dOption);
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QCommandLineOption mtlOption({ "m", "metal" }, QLatin1String("Metal"));
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cmdLineParser.addOption(mtlOption);
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QCommandLineOption nullOption({ "n", "null" }, QLatin1String("Null"));
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cmdLineParser.addOption(nullOption);
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cmdLineParser.process(app);
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if (cmdLineParser.isSet(glOption))
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graphicsApi = OpenGL;
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if (cmdLineParser.isSet(vkOption))
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graphicsApi = Vulkan;
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if (cmdLineParser.isSet(d3dOption))
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graphicsApi = D3D11;
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if (cmdLineParser.isSet(mtlOption))
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graphicsApi = Metal;
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if (cmdLineParser.isSet(nullOption))
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graphicsApi = Null;
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qDebug("Selected graphics API is %s", qPrintable(graphicsApiName()));
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qDebug("This is a multi-api example, use command line arguments to override:\n%s", qPrintable(cmdLineParser.helpText()));
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QRhi *r = nullptr;
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if (graphicsApi == Null) {
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QRhiNullInitParams params;
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r = QRhi::create(QRhi::Null, ¶ms);
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}
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#if QT_CONFIG(vulkan)
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QVulkanInstance inst;
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if (graphicsApi == Vulkan) {
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QLoggingCategory::setFilterRules(QStringLiteral("qt.vulkan=true"));
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inst.setLayers({ "VK_LAYER_KHRONOS_validation" });
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inst.setExtensions(QRhiVulkanInitParams::preferredInstanceExtensions());
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if (inst.create()) {
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QRhiVulkanInitParams params;
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params.inst = &inst;
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r = QRhi::create(QRhi::Vulkan, ¶ms);
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} else {
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qWarning("Failed to create Vulkan instance, switching to OpenGL");
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graphicsApi = OpenGL;
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}
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}
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#endif
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#ifndef QT_NO_OPENGL
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QScopedPointer<QOffscreenSurface> offscreenSurface;
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if (graphicsApi == OpenGL) {
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offscreenSurface.reset(QRhiGles2InitParams::newFallbackSurface());
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QRhiGles2InitParams params;
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params.fallbackSurface = offscreenSurface.data();
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r = QRhi::create(QRhi::OpenGLES2, ¶ms);
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}
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#endif
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#ifdef Q_OS_WIN
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if (graphicsApi == D3D11) {
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QRhiD3D11InitParams params;
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params.enableDebugLayer = true;
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r = QRhi::create(QRhi::D3D11, ¶ms);
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}
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#endif
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#if defined(Q_OS_MACOS) || defined(Q_OS_IOS)
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if (graphicsApi == Metal) {
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QRhiMetalInitParams params;
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r = QRhi::create(QRhi::Metal, ¶ms);
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}
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#endif
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if (!r)
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qFatal("Failed to initialize RHI");
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QRhiTexture *tex = r->newTexture(QRhiTexture::RGBA8, QSize(1280, 720), 1, QRhiTexture::RenderTarget | QRhiTexture::UsedAsTransferSource);
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tex->create();
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QRhiTextureRenderTarget *rt = r->newTextureRenderTarget({ tex });
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QRhiRenderPassDescriptor *rp = rt->newCompatibleRenderPassDescriptor();
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rt->setRenderPassDescriptor(rp);
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rt->create();
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QMatrix4x4 proj = r->clipSpaceCorrMatrix();
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proj.perspective(45.0f, 1280 / 720.f, 0.01f, 1000.0f);
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proj.translate(0, 0, -4);
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QRhiBuffer *vbuf = r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData));
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vbuf->create();
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QRhiBuffer *ubuf = r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68);
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ubuf->create();
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QRhiShaderResourceBindings *srb = r->newShaderResourceBindings();
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srb->setBindings({
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QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, ubuf)
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});
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srb->create();
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QRhiGraphicsPipeline *ps = r->newGraphicsPipeline();
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QRhiGraphicsPipeline::TargetBlend premulAlphaBlend;
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premulAlphaBlend.enable = true;
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ps->setTargetBlends({ premulAlphaBlend });
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const QShader vs = getShader(QLatin1String(":/color.vert.qsb"));
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if (!vs.isValid())
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qFatal("Failed to load shader pack (vertex)");
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const QShader fs = getShader(QLatin1String(":/color.frag.qsb"));
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if (!fs.isValid())
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qFatal("Failed to load shader pack (fragment)");
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ps->setShaderStages({
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{ QRhiShaderStage::Vertex, vs },
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{ QRhiShaderStage::Fragment, fs }
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});
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QRhiVertexInputLayout inputLayout;
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inputLayout.setBindings({
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{ 5 * sizeof(float) }
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});
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inputLayout.setAttributes({
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{ 0, 0, QRhiVertexInputAttribute::Float2, 0 },
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{ 0, 1, QRhiVertexInputAttribute::Float3, 2 * sizeof(float) }
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});
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ps->setVertexInputLayout(inputLayout);
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ps->setShaderResourceBindings(srb);
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ps->setRenderPassDescriptor(rp);
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ps->create();
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int frame = 0;
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for (; frame < 20; ++frame) {
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QRhiCommandBuffer *cb;
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if (r->beginOffscreenFrame(&cb) != QRhi::FrameOpSuccess)
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break;
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qDebug("Generating offscreen frame %d", frame);
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QRhiResourceUpdateBatch *u = r->nextResourceUpdateBatch();
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if (frame == 0)
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u->uploadStaticBuffer(vbuf, vertexData);
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static float rotation = 0.0f;
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QMatrix4x4 mvp = proj;
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mvp.rotate(rotation, 0, 1, 0);
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u->updateDynamicBuffer(ubuf, 0, 64, mvp.constData());
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rotation += 5.0f;
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static float opacity = 1.0f;
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static int opacityDir= 1;
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u->updateDynamicBuffer(ubuf, 64, 4, &opacity);
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opacity += opacityDir * 0.005f;
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if (opacity < 0.0f || opacity > 1.0f) {
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opacityDir *= -1;
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opacity = qBound(0.0f, opacity, 1.0f);
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}
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cb->beginPass(rt, QColor::fromRgbF(0.0f, 1.0f, 0.0f, 1.0f), { 1, 0 }, u);
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cb->setGraphicsPipeline(ps);
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cb->setViewport({ 0, 0, 1280, 720 });
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cb->setShaderResources();
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const QRhiCommandBuffer::VertexInput vbufBinding(vbuf, 0);
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cb->setVertexInput(0, 1, &vbufBinding);
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cb->draw(3);
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u = r->nextResourceUpdateBatch();
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QRhiReadbackDescription rb(tex);
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QRhiReadbackResult rbResult;
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rbResult.completed = [frame] { qDebug(" - readback %d completed", frame); };
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u->readBackTexture(rb, &rbResult);
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cb->endPass(u);
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qDebug("Submit and wait");
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#ifdef TEST_FINISH
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r->finish();
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#else
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r->endOffscreenFrame();
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#endif
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// The data should be ready either because endOffscreenFrame() waits
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// for completion or because finish() did.
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if (!rbResult.data.isEmpty()) {
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const uchar *p = reinterpret_cast<const uchar *>(rbResult.data.constData());
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QImage image(p, rbResult.pixelSize.width(), rbResult.pixelSize.height(), QImage::Format_RGBA8888);
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QString fn = QString::asprintf("frame%d.png", frame);
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fn = QFileInfo(fn).absoluteFilePath();
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qDebug("Saving into %s", qPrintable(fn));
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if (r->isYUpInFramebuffer())
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image.mirrored().save(fn);
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else
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image.save(fn);
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} else {
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qWarning("Readback failed!");
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}
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#ifdef TEST_FINISH
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r->endOffscreenFrame();
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#endif
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}
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delete ps;
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delete srb;
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delete ubuf;
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delete vbuf;
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delete rt;
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delete rp;
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delete tex;
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delete r;
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qDebug("\nRendered and read back %d frames using %s", frame, qPrintable(graphicsApiName()));
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return 0;
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}
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