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