qt 6.5.1 original

examples/opengl/textures/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(textures LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/opengl/textures")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui OpenGL OpenGLWidgets Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(textures
+    glwidget.cpp glwidget.h
+    main.cpp
+    window.cpp window.h
+)
+
+set_target_properties(textures PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(textures PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::OpenGL
+    Qt6::OpenGLWidgets
+    Qt6::Widgets
+)
+
+# Resources:
+set(textures_resource_files
+    "images/side1.png"
+    "images/side2.png"
+    "images/side3.png"
+    "images/side4.png"
+    "images/side5.png"
+    "images/side6.png"
+)
+
+qt6_add_resources(textures "textures"
+    PREFIX
+        "/"
+    FILES
+        ${textures_resource_files}
+)
+
+install(TARGETS textures
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/opengl/textures/glwidget.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "glwidget.h"
+#include <QOpenGLShaderProgram>
+#include <QOpenGLTexture>
+#include <QMouseEvent>
+
+GLWidget::~GLWidget()
+{
+    makeCurrent();
+    vbo.destroy();
+    for (int i = 0; i < 6; ++i)
+        delete textures[i];
+    delete program;
+    doneCurrent();
+}
+
+QSize GLWidget::minimumSizeHint() const
+{
+    return QSize(50, 50);
+}
+
+QSize GLWidget::sizeHint() const
+{
+    return QSize(200, 200);
+}
+
+void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle)
+{
+    xRot += xAngle;
+    yRot += yAngle;
+    zRot += zAngle;
+    update();
+}
+
+void GLWidget::setClearColor(const QColor &color)
+{
+    clearColor = color;
+    update();
+}
+
+void GLWidget::initializeGL()
+{
+    initializeOpenGLFunctions();
+
+    makeObject();
+
+#define PROGRAM_VERTEX_ATTRIBUTE 0
+#define PROGRAM_TEXCOORD_ATTRIBUTE 1
+
+    QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
+    const char *vsrc =
+        "attribute highp vec4 vertex;\n"
+        "attribute mediump vec4 texCoord;\n"
+        "varying mediump vec4 texc;\n"
+        "uniform mediump mat4 matrix;\n"
+        "void main(void)\n"
+        "{\n"
+        "    gl_Position = matrix * vertex;\n"
+        "    texc = texCoord;\n"
+        "}\n";
+    vshader->compileSourceCode(vsrc);
+
+    QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
+    const char *fsrc =
+        "uniform sampler2D texture;\n"
+        "varying mediump vec4 texc;\n"
+        "void main(void)\n"
+        "{\n"
+        "    gl_FragColor = texture2D(texture, texc.st);\n"
+        "}\n";
+    fshader->compileSourceCode(fsrc);
+
+    program = new QOpenGLShaderProgram;
+    program->addShader(vshader);
+    program->addShader(fshader);
+    program->bindAttributeLocation("vertex", PROGRAM_VERTEX_ATTRIBUTE);
+    program->bindAttributeLocation("texCoord", PROGRAM_TEXCOORD_ATTRIBUTE);
+    program->link();
+
+    program->bind();
+    program->setUniformValue("texture", 0);
+}
+
+void GLWidget::paintGL()
+{
+    glClearColor(clearColor.redF(), clearColor.greenF(), clearColor.blueF(), clearColor.alphaF());
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE);
+
+    QMatrix4x4 m;
+    m.ortho(-0.5f, +0.5f, +0.5f, -0.5f, 4.0f, 15.0f);
+    m.translate(0.0f, 0.0f, -10.0f);
+    m.rotate(xRot / 16.0f, 1.0f, 0.0f, 0.0f);
+    m.rotate(yRot / 16.0f, 0.0f, 1.0f, 0.0f);
+    m.rotate(zRot / 16.0f, 0.0f, 0.0f, 1.0f);
+
+    vbo.bind();
+    program->bind();
+    program->setUniformValue("matrix", m);
+    program->enableAttributeArray(PROGRAM_VERTEX_ATTRIBUTE);
+    program->enableAttributeArray(PROGRAM_TEXCOORD_ATTRIBUTE);
+    program->setAttributeBuffer(PROGRAM_VERTEX_ATTRIBUTE, GL_FLOAT, 0, 3, 5 * sizeof(GLfloat));
+    program->setAttributeBuffer(PROGRAM_TEXCOORD_ATTRIBUTE, GL_FLOAT, 3 * sizeof(GLfloat), 2, 5 * sizeof(GLfloat));
+
+    for (int i = 0; i < 6; ++i) {
+        textures[i]->bind();
+        glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4);
+    }
+}
+void GLWidget::resizeGL(int width, int height)
+{
+    int side = qMin(width, height);
+    glViewport((width - side) / 2, (height - side) / 2, side, side);
+}
+
+void GLWidget::mousePressEvent(QMouseEvent *event)
+{
+    lastPos = event->position().toPoint();
+}
+
+void GLWidget::mouseMoveEvent(QMouseEvent *event)
+{
+    int dx = event->position().toPoint().x() - lastPos.x();
+    int dy = event->position().toPoint().y() - lastPos.y();
+
+    if (event->buttons() & Qt::LeftButton) {
+        rotateBy(8 * dy, 8 * dx, 0);
+    } else if (event->buttons() & Qt::RightButton) {
+        rotateBy(8 * dy, 0, 8 * dx);
+    }
+    lastPos = event->position().toPoint();
+}
+
+void GLWidget::mouseReleaseEvent(QMouseEvent * /* event */)
+{
+    emit clicked();
+}
+
+void GLWidget::makeObject()
+{
+    static const int coords[6][4][3] = {
+        { { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } },
+        { { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } },
+        { { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } },
+        { { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } },
+        { { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } },
+        { { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }
+    };
+
+    for (int j = 0; j < 6; ++j)
+        textures[j] = new QOpenGLTexture(QImage(QString(":/images/side%1.png").arg(j + 1)).mirrored());
+
+    QList<GLfloat> vertData;
+    for (int i = 0; i < 6; ++i) {
+        for (int j = 0; j < 4; ++j) {
+            // vertex position
+            vertData.append(0.2 * coords[i][j][0]);
+            vertData.append(0.2 * coords[i][j][1]);
+            vertData.append(0.2 * coords[i][j][2]);
+            // texture coordinate
+            vertData.append(j == 0 || j == 3);
+            vertData.append(j == 0 || j == 1);
+        }
+    }
+
+    vbo.create();
+    vbo.bind();
+    vbo.allocate(vertData.constData(), vertData.count() * sizeof(GLfloat));
+}

examples/opengl/textures/glwidget.h

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+// Copyright (C) 2016 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>
+
+QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram);
+QT_FORWARD_DECLARE_CLASS(QOpenGLTexture)
+
+class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
+{
+    Q_OBJECT
+
+public:
+    using QOpenGLWidget::QOpenGLWidget;
+    ~GLWidget();
+
+    QSize minimumSizeHint() const override;
+    QSize sizeHint() const override;
+    void rotateBy(int xAngle, int yAngle, int zAngle);
+    void setClearColor(const QColor &color);
+
+signals:
+    void clicked();
+
+protected:
+    void initializeGL() override;
+    void paintGL() override;
+    void resizeGL(int width, int height) override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+
+private:
+    void makeObject();
+
+    QColor clearColor = Qt::black;
+    QPoint lastPos;
+    int xRot = 0;
+    int yRot = 0;
+    int zRot = 0;
+    QOpenGLTexture *textures[6] = {nullptr, nullptr, nullptr, nullptr, nullptr, nullptr};
+    QOpenGLShaderProgram *program = nullptr;
+    QOpenGLBuffer vbo;
+};
+
+#endif

examples/opengl/textures/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include <QSurfaceFormat>
+
+#include "window.h"
+
+int main(int argc, char *argv[])
+{
+    Q_INIT_RESOURCE(textures);
+
+    QApplication app(argc, argv);
+
+    QSurfaceFormat format;
+    format.setDepthBufferSize(24);
+    QSurfaceFormat::setDefaultFormat(format);
+
+    Window window;
+    window.show();
+    return app.exec();
+}

examples/opengl/textures/textures.pro

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+HEADERS       = glwidget.h \
+                window.h
+SOURCES       = glwidget.cpp \
+                main.cpp \
+                window.cpp
+
+RESOURCES     = textures.qrc
+
+QT += widgets opengl openglwidgets
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/textures
+INSTALLS += target

examples/opengl/textures/textures.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>images/side1.png</file>
+    <file>images/side2.png</file>
+    <file>images/side3.png</file>
+    <file>images/side4.png</file>
+    <file>images/side5.png</file>
+    <file>images/side6.png</file>
+</qresource>
+</RCC>

examples/opengl/textures/window.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+
+#include "glwidget.h"
+#include "window.h"
+
+Window::Window()
+{
+    QGridLayout *mainLayout = new QGridLayout;
+
+    for (int i = 0; i < NumRows; ++i) {
+        for (int j = 0; j < NumColumns; ++j) {
+            QColor clearColor;
+            clearColor.setHsv(((i * NumColumns) + j) * 255
+                              / (NumRows * NumColumns - 1),
+                              255, 63);
+
+            glWidgets[i][j] = new GLWidget;
+            glWidgets[i][j]->setClearColor(clearColor);
+            glWidgets[i][j]->rotateBy(+42 * 16, +42 * 16, -21 * 16);
+            mainLayout->addWidget(glWidgets[i][j], i, j);
+
+            connect(glWidgets[i][j], &GLWidget::clicked,
+                    this, &Window::setCurrentGlWidget);
+        }
+    }
+    setLayout(mainLayout);
+
+    currentGlWidget = glWidgets[0][0];
+
+    QTimer *timer = new QTimer(this);
+    connect(timer, &QTimer::timeout, this, &Window::rotateOneStep);
+    timer->start(20);
+
+    setWindowTitle(tr("Textures"));
+}
+
+void Window::setCurrentGlWidget()
+{
+    currentGlWidget = qobject_cast<GLWidget *>(sender());
+}
+
+void Window::rotateOneStep()
+{
+    if (currentGlWidget)
+        currentGlWidget->rotateBy(+2 * 16, +2 * 16, -1 * 16);
+}

examples/opengl/textures/window.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include <QWidget>
+
+class GLWidget;
+
+class Window : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Window();
+
+private slots:
+    void setCurrentGlWidget();
+    void rotateOneStep();
+
+private:
+    enum { NumRows = 2, NumColumns = 3 };
+
+    GLWidget *glWidgets[NumRows][NumColumns];
+    GLWidget *currentGlWidget;
+};
+
+#endif