qt 6.5.1 original

examples/opengl/stereoqopenglwidget/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(stereoqopenglwidget LANGUAGES CXX)
+
+set(CMAKE_AUTOMOC ON)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/opengl/stereoqopenglwidget")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui OpenGL OpenGLWidgets Widgets)
+
+qt_add_executable(stereoqopenglwidget
+    glwidget.cpp glwidget.h
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+
+set_target_properties(stereoqopenglwidget PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(stereoqopenglwidget PUBLIC
+    Qt::Core
+    Qt::Gui
+    Qt::OpenGL
+    Qt::OpenGLWidgets
+    Qt::Widgets
+)
+
+
+install(TARGETS stereoqopenglwidget
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/opengl/stereoqopenglwidget/glwidget.cpp

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "glwidget.h"
+#include <QPainter>
+#include <QPaintEngine>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLTexture>
+#include <QRandomGenerator>
+#include <QCoreApplication>
+#include <QFileDialog>
+#include <qmath.h>
+
+GLWidget::GLWidget(const QColor &background)
+    : m_background(background)
+{
+    setMinimumSize(300, 250);
+}
+
+GLWidget::~GLWidget()
+{
+    reset();
+}
+
+void GLWidget::saveImage(TargetBuffer targetBuffer)
+{
+    QImage img = grabFramebuffer(targetBuffer);
+    if (img.isNull()) {
+        qFatal("Failed to grab framebuffer");
+    }
+
+    const char *fn =
+            targetBuffer == TargetBuffer::LeftBuffer
+            ? "leftBuffer.png" : "rightBuffer.png";
+
+    QFileDialog fd(this);
+    fd.setAcceptMode(QFileDialog::AcceptSave);
+    fd.setDefaultSuffix("png");
+    fd.selectFile(fn);
+    if (fd.exec() == QDialog::Accepted)
+        img.save(fd.selectedFiles().first());
+}
+
+void GLWidget::reset()
+{
+    // And now release all OpenGL resources.
+    makeCurrent();
+    delete m_program;
+    m_program = nullptr;
+    delete m_vshader;
+    m_vshader = nullptr;
+    delete m_fshader;
+    m_fshader = nullptr;
+    m_vbo.destroy();
+    doneCurrent();
+
+    // We are done with the current QOpenGLContext, forget it. If there is a
+    // subsequent initialize(), that will then connect to the new context.
+    QObject::disconnect(m_contextWatchConnection);
+}
+void GLWidget::initializeGL()
+{
+    initializeOpenGLFunctions();
+
+    m_vshader = new QOpenGLShader(QOpenGLShader::Vertex);
+    const char *vsrc1 =
+        "attribute highp vec4 vertex;\n"
+        "attribute mediump vec3 normal;\n"
+        "uniform mediump mat4 matrix;\n"
+        "varying mediump vec4 color;\n"
+        "void main(void)\n"
+        "{\n"
+        "    vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));\n"
+        "    float angle = max(dot(normal, toLight), 0.0);\n"
+        "    vec3 col = vec3(0.40, 1.0, 0.0);\n"
+        "    color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);\n"
+        "    color = clamp(color, 0.0, 1.0);\n"
+        "    gl_Position = matrix * vertex;\n"
+        "}\n";
+    m_vshader->compileSourceCode(vsrc1);
+
+    m_fshader = new QOpenGLShader(QOpenGLShader::Fragment);
+    const char *fsrc1 =
+        "varying mediump vec4 color;\n"
+        "void main(void)\n"
+        "{\n"
+        "    gl_FragColor = color;\n"
+        "}\n";
+    m_fshader->compileSourceCode(fsrc1);
+
+    m_program = new QOpenGLShaderProgram;
+    m_program->addShader(m_vshader);
+    m_program->addShader(m_fshader);
+    m_program->link();
+
+
+    m_vertexAttr = m_program->attributeLocation("vertex");
+    m_normalAttr = m_program->attributeLocation("normal");
+    m_matrixUniform = m_program->uniformLocation("matrix");
+
+    createGeometry();
+
+    m_vbo.create();
+    m_vbo.bind();
+    const int vertexCount = m_vertices.count();
+    QList<GLfloat> buf;
+    buf.resize(vertexCount * 3 * 2);
+    GLfloat *p = buf.data();
+    for (int i = 0; i < vertexCount; ++i) {
+        *p++ = m_vertices[i].x();
+        *p++ = m_vertices[i].y();
+        *p++ = m_vertices[i].z();
+        *p++ = m_normals[i].x();
+        *p++ = m_normals[i].y();
+        *p++ = m_normals[i].z();
+    }
+    m_vbo.allocate(buf.constData(), (int)buf.count() * sizeof(GLfloat));
+    m_vbo.release();
+
+    m_contextWatchConnection = QObject::connect(context(), &QOpenGLContext::aboutToBeDestroyed, context(), [this] { reset(); });
+
+    glFrontFace(GL_CW);
+    glCullFace(GL_FRONT);
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_DEPTH_TEST);
+}
+
+void GLWidget::paintGL()
+{
+    // When QSurfaceFormat::StereoBuffers is enabled, this function is called twice.
+    // Once where currentTargetBuffer() == QOpenGLWidget::LeftBuffer,
+    // and once where currentTargetBuffer() == QOpenGLWidget::RightBuffer.
+
+    glClearColor(m_background.redF(), m_background.greenF(), m_background.blueF(), 1.0f);
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    //! [1]
+    // Slightly translate the model, so that there's a visible difference in each buffer.
+    QMatrix4x4 modelview;
+    if (currentTargetBuffer() == QOpenGLWidget::LeftBuffer)
+        modelview.translate(-0.4f, 0.0f, 0.0f);
+    else if (currentTargetBuffer() == QOpenGLWidget::RightBuffer)
+        modelview.translate(0.4f, 0.0f, 0.0f);
+     //! [1]
+
+    m_program->bind();
+    m_program->setUniformValue(m_matrixUniform, modelview);
+    m_program->enableAttributeArray(m_vertexAttr);
+    m_program->enableAttributeArray(m_normalAttr);
+
+    m_vbo.bind();
+    m_program->setAttributeBuffer(m_vertexAttr, GL_FLOAT, 0, 3, 6 * sizeof(GLfloat));
+    m_program->setAttributeBuffer(m_normalAttr, GL_FLOAT, 3 * sizeof(GLfloat), 3, 6 * sizeof(GLfloat));
+    m_vbo.release();
+
+    glDrawArrays(GL_TRIANGLES, 0, m_vertices.size());
+
+    m_program->disableAttributeArray(m_normalAttr);
+    m_program->disableAttributeArray(m_vertexAttr);
+    m_program->release();
+    update();
+}
+
+void GLWidget::createGeometry()
+{
+    m_vertices.clear();
+    m_normals.clear();
+
+    qreal x1 = +0.06f;
+    qreal y1 = -0.14f;
+    qreal x2 = +0.14f;
+    qreal y2 = -0.06f;
+    qreal x3 = +0.08f;
+    qreal y3 = +0.00f;
+    qreal x4 = +0.30f;
+    qreal y4 = +0.22f;
+
+    quad(x1, y1, x2, y2, y2, x2, y1, x1);
+    quad(x3, y3, x4, y4, y4, x4, y3, x3);
+
+    extrude(x1, y1, x2, y2);
+    extrude(x2, y2, y2, x2);
+    extrude(y2, x2, y1, x1);
+    extrude(y1, x1, x1, y1);
+    extrude(x3, y3, x4, y4);
+    extrude(x4, y4, y4, x4);
+    extrude(y4, x4, y3, x3);
+
+    const int NumSectors = 100;
+    const qreal sectorAngle = 2 * qreal(M_PI) / NumSectors;
+
+    for (int i = 0; i < NumSectors; ++i) {
+        qreal angle = i * sectorAngle;
+        qreal x5 = 0.30 * sin(angle);
+        qreal y5 = 0.30 * cos(angle);
+        qreal x6 = 0.20 * sin(angle);
+        qreal y6 = 0.20 * cos(angle);
+
+        angle += sectorAngle;
+        qreal x7 = 0.20 * sin(angle);
+        qreal y7 = 0.20 * cos(angle);
+        qreal x8 = 0.30 * sin(angle);
+        qreal y8 = 0.30 * cos(angle);
+
+        quad(x5, y5, x6, y6, x7, y7, x8, y8);
+
+        extrude(x6, y6, x7, y7);
+        extrude(x8, y8, x5, y5);
+    }
+
+    for (int i = 0;i < m_vertices.size();i++)
+        m_vertices[i] *= 2.0f;
+}
+
+void GLWidget::quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4)
+{
+    m_vertices << QVector3D(x1, y1, -0.05f);
+    m_vertices << QVector3D(x2, y2, -0.05f);
+    m_vertices << QVector3D(x4, y4, -0.05f);
+
+    m_vertices << QVector3D(x3, y3, -0.05f);
+    m_vertices << QVector3D(x4, y4, -0.05f);
+    m_vertices << QVector3D(x2, y2, -0.05f);
+
+    QVector3D n = QVector3D::normal
+        (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(x4 - x1, y4 - y1, 0.0f));
+
+    m_normals << n;
+    m_normals << n;
+    m_normals << n;
+
+    m_normals << n;
+    m_normals << n;
+    m_normals << n;
+
+    m_vertices << QVector3D(x4, y4, 0.05f);
+    m_vertices << QVector3D(x2, y2, 0.05f);
+    m_vertices << QVector3D(x1, y1, 0.05f);
+
+    m_vertices << QVector3D(x2, y2, 0.05f);
+    m_vertices << QVector3D(x4, y4, 0.05f);
+    m_vertices << QVector3D(x3, y3, 0.05f);
+
+    n = QVector3D::normal
+        (QVector3D(x2 - x4, y2 - y4, 0.0f), QVector3D(x1 - x4, y1 - y4, 0.0f));
+
+    m_normals << n;
+    m_normals << n;
+    m_normals << n;
+
+    m_normals << n;
+    m_normals << n;
+    m_normals << n;
+}
+
+void GLWidget::extrude(qreal x1, qreal y1, qreal x2, qreal y2)
+{
+    m_vertices << QVector3D(x1, y1, +0.05f);
+    m_vertices << QVector3D(x2, y2, +0.05f);
+    m_vertices << QVector3D(x1, y1, -0.05f);
+
+    m_vertices << QVector3D(x2, y2, -0.05f);
+    m_vertices << QVector3D(x1, y1, -0.05f);
+    m_vertices << QVector3D(x2, y2, +0.05f);
+
+    QVector3D n = QVector3D::normal
+        (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(0.0f, 0.0f, -0.1f));
+
+    m_normals << n;
+    m_normals << n;
+    m_normals << n;
+
+    m_normals << n;
+    m_normals << n;
+    m_normals << n;
+}

examples/opengl/stereoqopenglwidget/glwidget.h

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QOpenGLWidget>
+#include <QOpenGLFunctions>
+#include <QOpenGLBuffer>
+#include <QVector3D>
+#include <QMatrix4x4>
+#include <QElapsedTimer>
+#include <QList>
+#include <QPushButton>
+
+
+QT_FORWARD_DECLARE_CLASS(QOpenGLTexture)
+QT_FORWARD_DECLARE_CLASS(QOpenGLShader)
+QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
+
+class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
+{
+    Q_OBJECT
+public:
+    GLWidget(const QColor &background);
+    ~GLWidget();
+
+    void saveImage(QOpenGLWidget::TargetBuffer targetBuffer);
+
+protected:
+    void paintGL() override;
+    void initializeGL() override;
+
+private:
+    void createGeometry();
+    void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
+    void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
+    void reset();
+
+    QList<QVector3D> m_vertices;
+    QList<QVector3D> m_normals;
+    QOpenGLShader *m_vshader = nullptr;
+    QOpenGLShader *m_fshader = nullptr;
+    QOpenGLShaderProgram *m_program = nullptr;
+    QOpenGLBuffer m_vbo;
+    int m_vertexAttr;
+    int m_normalAttr;
+    int m_matrixUniform;
+    QColor m_background;
+    QMetaObject::Connection m_contextWatchConnection;
+};
+
+#endif

examples/opengl/stereoqopenglwidget/main.cpp

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include <QSurfaceFormat>
+#include "mainwindow.h"
+
+int main( int argc, char ** argv )
+{
+    QApplication a( argc, argv );
+
+    QCoreApplication::setApplicationName("Qt QOpenGLWidget Stereoscopic Rendering Example");
+    QCoreApplication::setOrganizationName("QtProject");
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+
+    //! [1]
+    QSurfaceFormat format;
+    format.setDepthBufferSize(24);
+    format.setStencilBufferSize(8);
+
+    // Enable stereoscopic rendering support
+    format.setStereo(true);
+
+    QSurfaceFormat::setDefaultFormat(format);
+    //! [1]
+
+    MainWindow mw;
+    mw.resize(1280, 720);
+    mw.show();
+    return a.exec();
+}

examples/opengl/stereoqopenglwidget/mainwindow.cpp

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "mainwindow.h"
+#include <QApplication>
+#include <QMenuBar>
+#include "glwidget.h"
+
+MainWindow::MainWindow()
+{
+    GLWidget *glwidget = new GLWidget(qRgb(20, 20, 50));
+    setCentralWidget(glwidget);
+
+    QMenu *screenShotMenu = menuBar()->addMenu("&Screenshot");
+    screenShotMenu->addAction("Left buffer", this, [glwidget](){
+        glwidget->saveImage(QOpenGLWidget::LeftBuffer);
+    });
+
+    screenShotMenu->addAction("Right buffer", this, [glwidget](){
+        glwidget->saveImage(QOpenGLWidget::RightBuffer);
+    });
+
+    QMenu *helpMenu = menuBar()->addMenu("&Help");
+    helpMenu->addAction("About Qt", qApp, &QApplication::aboutQt);
+}

examples/opengl/stereoqopenglwidget/mainwindow.h

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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QTimer>
+#include <QGridLayout>
+
+QT_FORWARD_DECLARE_CLASS(QOpenGLWidget)
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow();
+};
+
+#endif

examples/opengl/stereoqopenglwidget/stereoqopenglwidget.pro

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+QT += widgets opengl openglwidgets
+
+SOURCES += main.cpp \
+           glwidget.cpp \
+           mainwindow.cpp
+
+HEADERS += glwidget.h \
+           mainwindow.h
+
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/stereoqopenglwidget
+INSTALLS += target