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Diffstat (limited to 'examples/quick/rendercontrol/rendercontrol_d3d11/window.cpp')
| -rw-r--r-- | examples/quick/rendercontrol/rendercontrol_d3d11/window.cpp | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/examples/quick/rendercontrol/rendercontrol_d3d11/window.cpp b/examples/quick/rendercontrol/rendercontrol_d3d11/window.cpp new file mode 100644 index 0000000000..cb84371fed --- /dev/null +++ b/examples/quick/rendercontrol/rendercontrol_d3d11/window.cpp @@ -0,0 +1,389 @@ +/**************************************************************************** +** +** Copyright (C) 2020 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "window.h" +#include <QCoreApplication> +#include <QMouseEvent> +#include <QQuickRenderControl> +#include <QQuickWindow> +#include <QQuickItem> +#include <QQmlEngine> +#include <QQmlComponent> +#include <QQuickRenderTarget> +#include <QQuickGraphicsDevice> + +#include "quad.vert.inc" +#include "quad.frag.inc" + +// In this example the Qt Quick scene will always render at 720p regardless of +// the window size. +const int QML_WIDTH = 1280; +const int QML_HEIGHT = 720; + +// Set to 4 or 8 to enable MSAA. This will lead to creating a multisample +// texture, passing in the sample count to Qt Quick (so it sets the graphics +// pipelines up as appropriate), and then doing a resolve to a non-multisample +// texture every time Quick has rendered its content. +const int SAMPLE_COUNT = 1; + +// by subclassing QQuickRenderControl we gain the ability to report a QWindow +// to which certain operations, such as the querying of devicePixelRatio() +// should be redirected +class RenderControl : public QQuickRenderControl +{ +public: + RenderControl(QWindow *w) : m_window(w) { } + QWindow *renderWindow(QPoint *offset) override; + +private: + QWindow *m_window; +}; + +QWindow *RenderControl::renderWindow(QPoint *offset) +{ + if (offset) + *offset = QPoint(0, 0); + return m_window; +} + +Window::Window(Engine *engine) + : m_engine(engine) +{ + setSurfaceType(QSurface::OpenGLSurface); + + m_renderControl = new RenderControl(this); + + // Whenever something changed in the Quick scene, or rendering was + // requested via others means (e.g. QQuickWindow::update()), it should + // trigger rendering into the texture when preparing the next frame. + connect(m_renderControl, &QQuickRenderControl::renderRequested, this, [this] { m_quickDirty = true; }); + connect(m_renderControl, &QQuickRenderControl::sceneChanged, this, [this] { m_quickDirty = true; }); + + // Note that on its own this is not sufficient to get MSAA, the render + // target (the texture in this case) must be set up accordingly as well, + // and the sample count also needs to be passed to + // QQuickRenderTarget::fromNativeTexture(). + m_renderControl->setSamples(SAMPLE_COUNT); + + // Create a QQuickWindow that is associated with out render control. Note that this + // window never gets created or shown, meaning that it will never get an underlying + // native (platform) window. + m_quickWindow = new QQuickWindow(m_renderControl); + + m_qmlEngine = new QQmlEngine; + m_qmlComponent = new QQmlComponent(m_qmlEngine, QUrl(QLatin1String("qrc:/rendercontrol/demo.qml"))); + if (m_qmlComponent->isError()) { + for (const QQmlError &error : m_qmlComponent->errors()) + qWarning() << error.url() << error.line() << error; + } + + QObject *rootObject = m_qmlComponent->create(); + if (m_qmlComponent->isError()) { + for (const QQmlError &error : m_qmlComponent->errors()) + qWarning() << error.url() << error.line() << error; + } + + QQuickItem *rootItem = qobject_cast<QQuickItem *>(rootObject); + rootItem->setSize(QSize(QML_WIDTH, QML_HEIGHT)); + m_quickWindow->contentItem()->setSize(rootItem->size()); + m_quickWindow->setGeometry(0, 0, rootItem->width(), rootItem->height()); + + rootItem->setParentItem(m_quickWindow->contentItem()); +} + +Window::~Window() +{ + delete m_qmlComponent; + delete m_qmlEngine; + delete m_quickWindow; + delete m_renderControl; + + releaseResources(); + + // Often a no-op (if we already got SurfaceAboutToBeDestroyed), but there + // are cases when that's not sent. + m_swapchain.destroy(); +} + +// Expose (and UpdateRequest) are all the events we need: resize and screen dpr +// changes are handled implicitly since every render() checks for size changes +// so no separate event handlers are needed for that. + +void Window::exposeEvent(QExposeEvent *) +{ + if (isExposed()) { + // initialize if this is the first expose + if (!m_swapchain.swapchain) + m_swapchain = m_engine->createSwapchain(this); + // must always render and present a frame on expose + if (!size().isEmpty()) + render(); + } +} + +// Input is severly limited in this example: there is no mapping or projection +// of any kind, so it all behaves as if the Qt Quick content was covering the +// entire window. The example only cares about button down/up, not the position +// so this is acceptable here. + +void Window::mousePressEvent(QMouseEvent *e) +{ + QMouseEvent mappedEvent(e->type(), e->localPos(), e->screenPos(), e->button(), e->buttons(), e->modifiers()); + QCoreApplication::sendEvent(m_quickWindow, &mappedEvent); +} + +void Window::mouseReleaseEvent(QMouseEvent *e) +{ + QMouseEvent mappedEvent(e->type(), e->localPos(), e->screenPos(), e->button(), e->buttons(), e->modifiers()); + QCoreApplication::sendEvent(m_quickWindow, &mappedEvent); +} + +bool Window::event(QEvent *e) +{ + switch (e->type()) { + case QEvent::UpdateRequest: + render(); + break; + + case QEvent::PlatformSurface: + // trying to be nice, not strictly required for D3D + if (static_cast<QPlatformSurfaceEvent *>(e)->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed) + m_swapchain.destroy(); + break; + + default: + break; + } + + return QWindow::event(e); +} + +bool Window::initResources() +{ + ID3D11Device *dev = m_engine->device(); + + // vertex and pixel shader to render a textured quad + + HRESULT hr = dev->CreateVertexShader(g_quad_vs_main, sizeof(g_quad_vs_main), nullptr, &m_res.vertexShader); + if (FAILED(hr)) { + qWarning("Failed to create vertex shader: %s", qPrintable(comErrorMessage(hr))); + return false; + } + + hr = dev->CreatePixelShader(g_quad_ps_main, sizeof(g_quad_ps_main), nullptr, &m_res.pixelShader); + if (FAILED(hr)) { + qWarning("Failed to create pixel shader: %s", qPrintable(comErrorMessage(hr))); + return false; + } + + // texture into which Qt Quick will render and which we will then sample + + D3D11_TEXTURE2D_DESC texDesc = {}; + texDesc.Width = QML_WIDTH; + texDesc.Height = QML_HEIGHT; + texDesc.MipLevels = 1; + texDesc.ArraySize = 1; + texDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; + if (SAMPLE_COUNT > 1) { + texDesc.SampleDesc.Count = SAMPLE_COUNT; + texDesc.SampleDesc.Quality = UINT(D3D11_STANDARD_MULTISAMPLE_PATTERN); + } else { + texDesc.SampleDesc.Count = 1; + } + // we have to use BIND_SHADER_RESOURCE even if the texture is MSAA because + // an SRV may still get created internally by Qt Quick + texDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET; + texDesc.Usage = D3D11_USAGE_DEFAULT; + + hr = dev->CreateTexture2D(&texDesc, nullptr, &m_res.texture); + if (FAILED(hr)) { + qWarning("Failed to create texture: %s", qPrintable(comErrorMessage(hr))); + return false; + } + + if (SAMPLE_COUNT > 1) { + texDesc.SampleDesc.Count = 1; + texDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE; + hr = dev->CreateTexture2D(&texDesc, nullptr, &m_res.resolveTexture); + if (FAILED(hr)) { + qWarning("Failed to create resolve texture: %s", qPrintable(comErrorMessage(hr))); + return false; + } + } + + D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc = {}; + srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; + srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D; + srvDesc.Texture2D.MipLevels = 1; + + hr = dev->CreateShaderResourceView(SAMPLE_COUNT > 1 ? m_res.resolveTexture : m_res.texture, &srvDesc, &m_res.textureSrv); + if (FAILED(hr)) { + qWarning("Failed to create srv: %s", qPrintable(comErrorMessage(hr))); + return false; + } + + D3D11_SAMPLER_DESC sampDesc = {}; + sampDesc.Filter = D3D11_FILTER_MIN_POINT_MAG_MIP_LINEAR; + sampDesc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP; + sampDesc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP; + sampDesc.AddressW = D3D11_TEXTURE_ADDRESS_CLAMP; + sampDesc.MaxAnisotropy = 1.0f; + + hr = dev->CreateSamplerState(&sampDesc, &m_res.sampler); + if (FAILED(hr)) { + qWarning("Failed to create sampler state: %s", qPrintable(comErrorMessage(hr))); + return false; + } + + m_res.valid = true; + return true; +} + +void Window::releaseResources() +{ + RELEASE(m_res.vertexShader); + RELEASE(m_res.pixelShader); + RELEASE(m_res.texture); + RELEASE(m_res.resolveTexture); + RELEASE(m_res.textureSrv); + RELEASE(m_res.sampler); + + m_res.valid = false; +} + +void Window::render() +{ + if (!isExposed() || !m_swapchain.swapchain || !m_swapchain.tex || !m_swapchain.rtv) + return; + + // if the window got resized, the swapchain buffers must be resized as well + if (m_swapchain.pixelSize != m_engine->swapchainSizeForWindow(this)) + m_engine->resizeSwapchain(&m_swapchain, this); + + if (!m_res.valid) { + if (!initResources()) + return; + } + + // get some content into m_res.texture from Qt Quick + updateQuick(); + + // now onto our own drawing, targeting the window + ID3D11DeviceContext1 *ctx = m_engine->context(); + const QSize viewSize = m_swapchain.pixelSize; + + const float clearColor[] = { 0.4f, 0.7f, 0.0f, 1.0f }; + ctx->ClearRenderTargetView(m_swapchain.rtv, clearColor); + ctx->ClearDepthStencilView(m_swapchain.dsv, D3D11_CLEAR_DEPTH | D3D11_CLEAR_STENCIL, 1.0f, 0); + + ctx->OMSetRenderTargets(1, &m_swapchain.rtv, m_swapchain.dsv); + + const D3D11_VIEWPORT viewport = { 0.0f, 0.0f, float(viewSize.width()), float(viewSize.height()), + 0.f, 1.0f }; + ctx->RSSetViewports(1, &viewport); + + // draw a textured quad + + ctx->VSSetShader(m_res.vertexShader, nullptr, 0); + ctx->PSSetShader(m_res.pixelShader, nullptr, 0); + + ctx->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST); + ctx->IASetInputLayout(nullptr); + ctx->OMSetDepthStencilState(nullptr, 0); + ctx->OMSetBlendState(nullptr, nullptr, 0xffffffff); + ctx->RSSetState(nullptr); + + ctx->PSSetShaderResources(0, 1, &m_res.textureSrv); + ctx->PSSetSamplers(0, 1, &m_res.sampler); + + ctx->Draw(6, 0); + + m_swapchain.swapchain->Present(1, 0); + + requestUpdate(); // will lead to eventually getting a QEvent::UpdateRequest +} + +void Window::updateQuick() +{ + if (!m_quickDirty) + return; + + m_quickDirty = false; + + if (!m_quickInitialized) { + // In addition to setSceneGraphBackend, we need a call to + // setGraphicsDevice to tell Qt Quick what ID3D11Device(Context) to use + // (i.e. we want it to use ours, not to create new ones). + m_quickWindow->setGraphicsDevice(QQuickGraphicsDevice::fromDeviceAndContext(m_engine->device(), m_engine->context())); + + // Now we can kick off the scenegraph. + if (!m_renderControl->initialize()) + qWarning("Failed to initialize redirected Qt Quick rendering"); + + // Redirect Qt Quick's output. (note that the QSGTexture::NativeTexture + // struct is expected to contain a pointer to the native object, even + // if the native object type is a pointer, such as ID3D11Texture2D*) + m_quickWindow->setRenderTarget(QQuickRenderTarget::fromNativeTexture({ &m_res.texture, 0 }, + QSize(QML_WIDTH, QML_HEIGHT), + SAMPLE_COUNT)); + + m_quickInitialized = true; + } + + m_renderControl->polishItems(); + + m_renderControl->beginFrame(); + m_renderControl->sync(); + m_renderControl->render(); + m_renderControl->endFrame(); // Qt Quick's rendering commands are submitted to the device context here + + if (SAMPLE_COUNT > 1) + m_engine->context()->ResolveSubresource(m_res.resolveTexture, 0, m_res.texture, 0, DXGI_FORMAT_R8G8B8A8_UNORM); +} |