qt 6.5.1 original

tests/manual/rhi/stereo/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## stereo Binary:
+#####################################################################
+
+qt_internal_add_manual_test(stereo
+    SOURCES
+        main.cpp
+        window.cpp window.h
+    LIBRARIES
+        Qt::Gui
+        Qt::GuiPrivate
+)
+
+# Resources:
+set_source_files_properties("../shared/color.frag.qsb"
+    PROPERTIES QT_RESOURCE_ALIAS "color.frag.qsb"
+)
+set_source_files_properties("../shared/color.vert.qsb"
+    PROPERTIES QT_RESOURCE_ALIAS "color.vert.qsb"
+)
+set(stereo_resource_files
+    "../shared/color.frag.qsb"
+    "../shared/color.vert.qsb"
+)
+
+qt_internal_add_resource(stereo "stereo"
+    PREFIX
+        "/"
+    FILES
+        ${stereo_resource_files}
+)

tests/manual/rhi/stereo/main.cpp

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+// This is a demo showing stereoscopic rendering.
+// For now, the backend is hardcoded to be OpenGL, because that's the only
+// supported backend.
+
+#include <QGuiApplication>
+#include <QCommandLineParser>
+#include "window.h"
+
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    QSurfaceFormat fmt;
+    fmt.setDepthBufferSize(24);
+    fmt.setStencilBufferSize(8);
+
+    // Request stereoscopic rendering support with left/right buffers
+    fmt.setStereo(true);
+
+    QSurfaceFormat::setDefaultFormat(fmt);
+
+    Window w;
+    w.resize(1280, 720);
+    w.setTitle(QCoreApplication::applicationName());
+    w.show();
+
+    int ret = app.exec();
+
+    if (w.handle())
+        w.releaseSwapChain();
+
+    return ret;
+}

tests/manual/rhi/stereo/stereo.pro

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+TEMPLATE = app
+CONFIG += console
+QT += gui-private
+
+SOURCES = \
+    main.cpp \
+    window.cpp
+
+HEADERS = \
+    window.h
+
+RESOURCES = stereo.qrc

tests/manual/rhi/stereo/stereo.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+  <file alias="color.vert.qsb">../shared/color.vert.qsb</file>
+  <file alias="color.frag.qsb">../shared/color.frag.qsb</file>
+</qresource>
+</RCC>

tests/manual/rhi/stereo/window.cpp

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "window.h"
+#include <QPlatformSurfaceEvent>
+#include <QTimer>
+#include <QFile>
+#include <QtGui/private/qshader_p.h>
+#include "../shared/cube.h"
+
+Window::Window()
+{
+    setSurfaceType(OpenGLSurface);
+}
+
+void Window::exposeEvent(QExposeEvent *)
+{
+    if (isExposed() && !m_running) {
+        m_running = true;
+        init();
+        resizeSwapChain();
+    }
+
+    const QSize surfaceSize = m_hasSwapChain ? m_sc->surfacePixelSize() : QSize();
+    if ((!isExposed() || (m_hasSwapChain && surfaceSize.isEmpty())) && m_running && !m_notExposed)
+        m_notExposed = true;
+
+    if (isExposed() && m_running && m_notExposed && !surfaceSize.isEmpty()) {
+        m_notExposed = false;
+        m_newlyExposed = true;
+    }
+
+    if (isExposed() && !surfaceSize.isEmpty())
+        render();
+}
+
+bool Window::event(QEvent *e)
+{
+    switch (e->type()) {
+    case QEvent::UpdateRequest:
+        render();
+        break;
+
+    case QEvent::PlatformSurface:
+        if (static_cast<QPlatformSurfaceEvent *>(e)->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed)
+            releaseSwapChain();
+        break;
+
+    default:
+        break;
+    }
+
+    return QWindow::event(e);
+}
+
+void Window::init()
+{
+    QRhi::Flags rhiFlags = QRhi::EnableDebugMarkers | QRhi::EnableProfiling;
+
+    m_fallbackSurface.reset(QRhiGles2InitParams::newFallbackSurface());
+    QRhiGles2InitParams params;
+    params.fallbackSurface = m_fallbackSurface.get();
+    params.window = this;
+    m_rhi.reset(QRhi::create(QRhi::OpenGLES2, &params, rhiFlags));
+
+    m_sc.reset(m_rhi->newSwapChain());
+    m_ds.reset(m_rhi->newRenderBuffer(QRhiRenderBuffer::DepthStencil,
+                                      QSize(),
+                                      1,
+                                      QRhiRenderBuffer::UsedWithSwapChainOnly));
+    m_sc->setWindow(this);
+    m_sc->setDepthStencil(m_ds.get());
+    m_rp.reset(m_sc->newCompatibleRenderPassDescriptor());
+    m_sc->setRenderPassDescriptor(m_rp.get());
+
+    m_vbuf.reset(m_rhi->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube)));
+    m_vbuf->setName(QByteArrayLiteral("vbuf"));
+    m_vbuf->create();
+    m_vbufReady = false;
+
+    m_ubuf.reset(m_rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 4));
+    m_ubuf->setName(QByteArrayLiteral("Left eye"));
+    m_ubuf->create();
+
+    m_srb.reset(m_rhi->newShaderResourceBindings());
+    m_srb->setBindings({
+            QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage,
+                                                     m_ubuf.get())
+    });
+    m_srb->create();
+
+
+    m_ubuf2.reset(m_rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 4));
+    m_ubuf2->setName(QByteArrayLiteral("Right eye"));
+    m_ubuf2->create();
+
+    m_srb2.reset(m_rhi->newShaderResourceBindings());
+    m_srb2->setBindings({
+            QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage,
+                                                     m_ubuf2.get())
+    });
+    m_srb2->create();
+
+    m_ps.reset(m_rhi->newGraphicsPipeline());
+
+    QRhiGraphicsPipeline::TargetBlend premulAlphaBlend;
+    premulAlphaBlend.enable = true;
+    m_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)");
+
+    m_ps->setShaderStages({
+        { QRhiShaderStage::Vertex, vs },
+        { QRhiShaderStage::Fragment, fs }
+    });
+
+    QRhiVertexInputLayout inputLayout;
+    inputLayout.setBindings({
+            { 3 * sizeof(float) },
+            { 2 * sizeof(float) }
+    });
+    inputLayout.setAttributes({
+            { 0, 0, QRhiVertexInputAttribute::Float3, 0 },
+            { 1, 1, QRhiVertexInputAttribute::Float2, 0 }
+    });
+
+    m_ps->setVertexInputLayout(inputLayout);
+    m_ps->setShaderResourceBindings(m_srb.get());
+    m_ps->setRenderPassDescriptor(m_rp.get());
+
+    m_ps->create();
+
+    m_ps->setDepthTest(true);
+    m_ps->setDepthWrite(true);
+    m_ps->setDepthOp(QRhiGraphicsPipeline::Less);
+
+    m_ps->setCullMode(QRhiGraphicsPipeline::Back);
+    m_ps->setFrontFace(QRhiGraphicsPipeline::CCW);
+}
+
+void Window::resizeSwapChain()
+{
+    m_hasSwapChain = m_sc->createOrResize(); // also handles m_ds
+
+    const QSize outputSize = m_sc->currentPixelSize();
+    m_proj = m_rhi->clipSpaceCorrMatrix();
+    m_proj.perspective(45.0f, outputSize.width() / (float) outputSize.height(), 0.01f, 1000.0f);
+    m_proj.translate(0, 0, -4);
+}
+
+void Window::releaseSwapChain()
+{
+    if (m_hasSwapChain) {
+        m_hasSwapChain = false;
+        m_sc->destroy();
+    }
+}
+
+void Window::render()
+{
+    if (!m_hasSwapChain || m_notExposed)
+        return;
+
+    if (m_sc->currentPixelSize() != m_sc->surfacePixelSize() || m_newlyExposed) {
+        resizeSwapChain();
+        if (!m_hasSwapChain)
+            return;
+        m_newlyExposed = false;
+    }
+
+    QRhi::FrameOpResult r = m_rhi->beginFrame(m_sc.get());
+    if (r == QRhi::FrameOpSwapChainOutOfDate) {
+        resizeSwapChain();
+        if (!m_hasSwapChain)
+            return;
+        r = m_rhi->beginFrame(m_sc.get());
+    }
+    if (r != QRhi::FrameOpSuccess) {
+        qDebug("beginFrame failed with %d, retry", r);
+        requestUpdate();
+        return;
+    }
+
+    recordFrame();
+
+    m_rhi->endFrame(m_sc.get());
+
+    QTimer::singleShot(0, this, [this] { render(); });
+}
+
+QShader Window::getShader(const QString &name)
+{
+    QFile f(name);
+    if (f.open(QIODevice::ReadOnly))
+        return QShader::fromSerialized(f.readAll());
+
+    return QShader();
+}
+
+// called once per frame
+void Window::recordFrame()
+{
+    QRhiResourceUpdateBatch *u = m_rhi->nextResourceUpdateBatch();
+    if (!m_vbufReady) {
+        m_vbufReady = true;
+        u->uploadStaticBuffer(m_vbuf.get(), cube);
+    }
+
+    QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
+    const QSize outputSizeInPixels = m_sc->currentPixelSize();
+
+    const QColor clearColor = QColor::fromRgbF(0.15f, 0.15f, 0.15f, 1.0f);
+    const QRhiDepthStencilClearValue depthStencil = { 1.0f, 0 };
+    const QRhiViewport viewPort = { 0, 0, float(outputSizeInPixels.width()), float(outputSizeInPixels.height()) };
+    const QRhiCommandBuffer::VertexInput vbufBindings[] = {
+        { m_vbuf.get(), 0 },
+        { m_vbuf.get(), quint32(36 * 3 * sizeof(float)) }
+    };
+
+    QMatrix4x4 mvp = m_rhi->clipSpaceCorrMatrix();
+    mvp.perspective(45.0f, outputSizeInPixels.width() / (float) outputSizeInPixels.height(), 0.01f, 100.0f);
+
+    m_translation += m_translationDir * 0.05f;
+    if (m_translation < -10.0f || m_translation > -5.0f) {
+        m_translationDir *= -1;
+        m_translation = qBound(-10.0f, m_translation, -5.0f);
+    }
+    mvp.translate(0, 0, m_translation);
+    m_rotation += .5f;
+    mvp.rotate(m_rotation, 0, 1, 0);
+    u->updateDynamicBuffer(m_ubuf.get(), 0, 64, mvp.constData());
+
+    float opacity = 1.0f;
+    u->updateDynamicBuffer(m_ubuf.get(), 64, 4, &opacity);
+
+    QMatrix4x4 mvp2 = mvp;
+    mvp2.translate(-2.f, 0, 0);
+
+    u->updateDynamicBuffer(m_ubuf2.get(), 0, 64, mvp2.constData());
+    u->updateDynamicBuffer(m_ubuf2.get(), 64, 4, &opacity);
+
+    cb->resourceUpdate(u);
+
+    cb->beginPass(m_sc->currentFrameRenderTarget(QRhiSwapChain::LeftBuffer), clearColor, depthStencil);
+    cb->setGraphicsPipeline(m_ps.get());
+    cb->setViewport(viewPort);
+    cb->setShaderResources(m_srb.get());
+    cb->setVertexInput(0, 2, vbufBindings);
+    cb->draw(36);
+    cb->endPass();
+
+    cb->beginPass(m_sc->currentFrameRenderTarget(QRhiSwapChain::RightBuffer), clearColor, depthStencil);
+    cb->setGraphicsPipeline(m_ps.get());
+    cb->setViewport(viewPort);
+    cb->setShaderResources(m_srb2.get());
+    cb->setVertexInput(0, 2, vbufBindings);
+    cb->draw(36);
+    cb->endPass();
+}

tests/manual/rhi/stereo/window.h

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include <QWindow>
+#include <QtGui/private/qrhigles2_p.h>
+#include <QOffscreenSurface>
+
+class Window : public QWindow
+{
+public:
+    Window();
+
+    void releaseSwapChain();
+
+protected:
+    std::unique_ptr<QOffscreenSurface> m_fallbackSurface;
+    std::unique_ptr<QRhi> m_rhi;
+    std::unique_ptr<QRhiSwapChain> m_sc;
+    std::unique_ptr<QRhiRenderBuffer> m_ds;
+    std::unique_ptr<QRhiRenderPassDescriptor> m_rp;
+
+    bool m_hasSwapChain = false;
+    QMatrix4x4 m_proj;
+
+private:
+    void init();
+    void resizeSwapChain();
+    void render();
+    void recordFrame();
+
+    void exposeEvent(QExposeEvent *) override;
+    bool event(QEvent *) override;
+
+    bool m_running = false;
+    bool m_notExposed = false;
+    bool m_newlyExposed = false;
+
+    QShader getShader(const QString &name);
+
+    std::unique_ptr<QRhiBuffer> m_vbuf;
+    bool m_vbufReady = false;
+    std::unique_ptr<QRhiBuffer> m_ubuf;
+    std::unique_ptr<QRhiBuffer> m_ubuf2;
+    std::unique_ptr<QRhiShaderResourceBindings> m_srb;
+    std::unique_ptr<QRhiShaderResourceBindings> m_srb2;
+    std::unique_ptr<QRhiGraphicsPipeline> m_ps;
+
+    float m_rotation = 0;
+    float m_translation = -5;
+    int m_translationDir = -1;
+};
+
+#endif