qt 6.5.1 original

examples/opengl/hellogles3/CMakeLists.txt

@@ -0,0 +1,50 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(hellogles3 LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/opengl/hellogles3")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui OpenGL)
+
+qt_standard_project_setup()
+
+qt_add_executable(hellogles3
+    ../hellogl2/logo.cpp ../hellogl2/logo.h
+    glwindow.cpp glwindow.h
+    main.cpp
+)
+
+set_target_properties(hellogles3 PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(hellogles3 PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::OpenGL
+)
+
+# Resources:
+set(hellogles3_resource_files
+    "qtlogo.png"
+)
+
+qt_add_resources(hellogles3 "hellogles3"
+    PREFIX
+        "/"
+    FILES
+        ${hellogles3_resource_files}
+)
+
+install(TARGETS hellogles3
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/opengl/hellogles3/glwindow.cpp

@@ -0,0 +1,225 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "glwindow.h"
+#include <QImage>
+#include <QOpenGLTexture>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLBuffer>
+#include <QOpenGLContext>
+#include <QOpenGLVertexArrayObject>
+#include <QOpenGLExtraFunctions>
+#include <QPropertyAnimation>
+#include <QSequentialAnimationGroup>
+#include <QTimer>
+
+GLWindow::GLWindow()
+{
+    m_world.setToIdentity();
+    m_world.translate(0, 0, -1);
+    m_world.rotate(180, 1, 0, 0);
+
+    QSequentialAnimationGroup *animGroup = new QSequentialAnimationGroup(this);
+    animGroup->setLoopCount(-1);
+    QPropertyAnimation *zAnim0 = new QPropertyAnimation(this, QByteArrayLiteral("z"));
+    zAnim0->setStartValue(1.5f);
+    zAnim0->setEndValue(10.0f);
+    zAnim0->setDuration(2000);
+    animGroup->addAnimation(zAnim0);
+    QPropertyAnimation *zAnim1 = new QPropertyAnimation(this, QByteArrayLiteral("z"));
+    zAnim1->setStartValue(10.0f);
+    zAnim1->setEndValue(50.0f);
+    zAnim1->setDuration(4000);
+    zAnim1->setEasingCurve(QEasingCurve::OutElastic);
+    animGroup->addAnimation(zAnim1);
+    QPropertyAnimation *zAnim2 = new QPropertyAnimation(this, QByteArrayLiteral("z"));
+    zAnim2->setStartValue(50.0f);
+    zAnim2->setEndValue(1.5f);
+    zAnim2->setDuration(2000);
+    animGroup->addAnimation(zAnim2);
+    animGroup->start();
+
+    QPropertyAnimation* rAnim = new QPropertyAnimation(this, QByteArrayLiteral("r"));
+    rAnim->setStartValue(0.0f);
+    rAnim->setEndValue(360.0f);
+    rAnim->setDuration(2000);
+    rAnim->setLoopCount(-1);
+    rAnim->start();
+
+    QTimer::singleShot(4000, this, &GLWindow::startSecondStage);
+}
+
+GLWindow::~GLWindow()
+{
+    makeCurrent();
+    delete m_texture;
+    delete m_program;
+    delete m_vbo;
+    delete m_vao;
+}
+
+void GLWindow::startSecondStage()
+{
+    QPropertyAnimation* r2Anim = new QPropertyAnimation(this, QByteArrayLiteral("r2"));
+    r2Anim->setStartValue(0.0f);
+    r2Anim->setEndValue(360.0f);
+    r2Anim->setDuration(20000);
+    r2Anim->setLoopCount(-1);
+    r2Anim->start();
+}
+
+void GLWindow::setZ(float v)
+{
+    m_eye.setZ(v);
+    m_uniformsDirty = true;
+    update();
+}
+
+void GLWindow::setR(float v)
+{
+    m_r = v;
+    m_uniformsDirty = true;
+    update();
+}
+
+void GLWindow::setR2(float v)
+{
+    m_r2 = v;
+    m_uniformsDirty = true;
+    update();
+}
+
+static const char *vertexShaderSource =
+    "layout(location = 0) in vec4 vertex;\n"
+    "layout(location = 1) in vec3 normal;\n"
+    "out vec3 vert;\n"
+    "out vec3 vertNormal;\n"
+    "out vec3 color;\n"
+    "uniform mat4 projMatrix;\n"
+    "uniform mat4 camMatrix;\n"
+    "uniform mat4 worldMatrix;\n"
+    "uniform mat4 myMatrix;\n"
+    "uniform sampler2D sampler;\n"
+    "void main() {\n"
+    "   ivec2 pos = ivec2(gl_InstanceID % 32, gl_InstanceID / 32);\n"
+    "   vec2 t = vec2(float(-16 + pos.x) * 0.8, float(-18 + pos.y) * 0.6);\n"
+    "   float val = 2.0 * length(texelFetch(sampler, pos, 0).rgb);\n"
+    "   mat4 wm = myMatrix * mat4(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, t.x, t.y, val, 1) * worldMatrix;\n"
+    "   color = texelFetch(sampler, pos, 0).rgb * vec3(0.4, 1.0, 0.0);\n"
+    "   vert = vec3(wm * vertex);\n"
+    "   vertNormal = mat3(transpose(inverse(wm))) * normal;\n"
+    "   gl_Position = projMatrix * camMatrix * wm * vertex;\n"
+    "}\n";
+
+static const char *fragmentShaderSource =
+    "in highp vec3 vert;\n"
+    "in highp vec3 vertNormal;\n"
+    "in highp vec3 color;\n"
+    "out highp vec4 fragColor;\n"
+    "uniform highp vec3 lightPos;\n"
+    "void main() {\n"
+    "   highp vec3 L = normalize(lightPos - vert);\n"
+    "   highp float NL = max(dot(normalize(vertNormal), L), 0.0);\n"
+    "   highp vec3 col = clamp(color * 0.2 + color * 0.8 * NL, 0.0, 1.0);\n"
+    "   fragColor = vec4(col, 1.0);\n"
+    "}\n";
+
+QByteArray versionedShaderCode(const char *src)
+{
+    QByteArray versionedSrc;
+
+    if (QOpenGLContext::currentContext()->isOpenGLES())
+        versionedSrc.append(QByteArrayLiteral("#version 300 es\n"));
+    else
+        versionedSrc.append(QByteArrayLiteral("#version 330\n"));
+
+    versionedSrc.append(src);
+    return versionedSrc;
+}
+
+void GLWindow::initializeGL()
+{
+    QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+
+    QImage img(":/qtlogo.png");
+    Q_ASSERT(!img.isNull());
+    delete m_texture;
+    m_texture = new QOpenGLTexture(img.scaled(32, 36).mirrored());
+
+    delete m_program;
+    m_program = new QOpenGLShaderProgram;
+    // Prepend the correct version directive to the sources. The rest is the
+    // same, thanks to the common GLSL syntax.
+    m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, versionedShaderCode(vertexShaderSource));
+    m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, versionedShaderCode(fragmentShaderSource));
+    m_program->link();
+
+    m_projMatrixLoc = m_program->uniformLocation("projMatrix");
+    m_camMatrixLoc = m_program->uniformLocation("camMatrix");
+    m_worldMatrixLoc = m_program->uniformLocation("worldMatrix");
+    m_myMatrixLoc = m_program->uniformLocation("myMatrix");
+    m_lightPosLoc = m_program->uniformLocation("lightPos");
+
+    // Create a VAO. Not strictly required for ES 3, but it is for plain OpenGL.
+    delete m_vao;
+    m_vao = new QOpenGLVertexArrayObject;
+    if (m_vao->create())
+        m_vao->bind();
+
+    m_program->bind();
+    delete m_vbo;
+    m_vbo = new QOpenGLBuffer;
+    m_vbo->create();
+    m_vbo->bind();
+    m_vbo->allocate(m_logo.constData(), m_logo.count() * sizeof(GLfloat));
+    f->glEnableVertexAttribArray(0);
+    f->glEnableVertexAttribArray(1);
+    f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat),
+                             nullptr);
+    f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat),
+                             reinterpret_cast<void *>(3 * sizeof(GLfloat)));
+    m_vbo->release();
+
+    f->glEnable(GL_DEPTH_TEST);
+    f->glEnable(GL_CULL_FACE);
+}
+
+void GLWindow::resizeGL(int w, int h)
+{
+    m_proj.setToIdentity();
+    m_proj.perspective(45.0f, GLfloat(w) / h, 0.01f, 100.0f);
+    m_uniformsDirty = true;
+}
+
+void GLWindow::paintGL()
+{
+    // Now use QOpenGLExtraFunctions instead of QOpenGLFunctions as we want to
+    // do more than what GL(ES) 2.0 offers.
+    QOpenGLExtraFunctions *f = QOpenGLContext::currentContext()->extraFunctions();
+
+    f->glClearColor(0, 0, 0, 1);
+    f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    m_program->bind();
+    m_texture->bind();
+
+    if (m_uniformsDirty) {
+        m_uniformsDirty = false;
+        QMatrix4x4 camera;
+        camera.lookAt(m_eye, m_eye + m_target, QVector3D(0, 1, 0));
+        m_program->setUniformValue(m_projMatrixLoc, m_proj);
+        m_program->setUniformValue(m_camMatrixLoc, camera);
+        QMatrix4x4 wm = m_world;
+        wm.rotate(m_r, 1, 1, 0);
+        m_program->setUniformValue(m_worldMatrixLoc, wm);
+        QMatrix4x4 mm;
+        mm.setToIdentity();
+        mm.rotate(-m_r2, 1, 0, 0);
+        m_program->setUniformValue(m_myMatrixLoc, mm);
+        m_program->setUniformValue(m_lightPosLoc, QVector3D(0, 0, 70));
+    }
+
+    // Now call a function introduced in OpenGL 3.1 / OpenGL ES 3.0. We
+    // requested a 3.3 or ES 3.0 context, so we know this will work.
+    f->glDrawArraysInstanced(GL_TRIANGLES, 0, m_logo.vertexCount(), 32 * 36);
+}

examples/opengl/hellogles3/glwindow.h

@@ -0,0 +1,65 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QOpenGLWindow>
+#include <QMatrix4x4>
+#include <QVector3D>
+#include "../hellogl2/logo.h"
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGLTexture;
+class QOpenGLShaderProgram;
+class QOpenGLBuffer;
+class QOpenGLVertexArrayObject;
+
+QT_END_NAMESPACE
+
+class GLWindow : public QOpenGLWindow
+{
+    Q_OBJECT
+    Q_PROPERTY(float z READ z WRITE setZ)
+    Q_PROPERTY(float r READ r WRITE setR)
+    Q_PROPERTY(float r2 READ r2 WRITE setR2)
+
+public:
+    GLWindow();
+    ~GLWindow();
+
+    void initializeGL();
+    void resizeGL(int w, int h);
+    void paintGL();
+
+    float z() const { return m_eye.z(); }
+    void setZ(float v);
+
+    float r() const { return m_r; }
+    void setR(float v);
+    float r2() const { return m_r2; }
+    void setR2(float v);
+private slots:
+    void startSecondStage();
+private:
+    QOpenGLTexture *m_texture = nullptr;
+    QOpenGLShaderProgram *m_program = nullptr;
+    QOpenGLBuffer *m_vbo = nullptr;
+    QOpenGLVertexArrayObject *m_vao = nullptr;
+    Logo m_logo;
+    int m_projMatrixLoc = 0;
+    int m_camMatrixLoc = 0;
+    int m_worldMatrixLoc = 0;
+    int m_myMatrixLoc = 0;
+    int m_lightPosLoc = 0;
+    QMatrix4x4 m_proj;
+    QMatrix4x4 m_world;
+    QVector3D m_eye;
+    QVector3D m_target = {0, 0, -1};
+    bool m_uniformsDirty = true;
+    float m_r = 0;
+    float m_r2 = 0;
+};
+
+#endif

examples/opengl/hellogles3/hellogles3.pro

@@ -0,0 +1,13 @@
+QT += opengl
+
+HEADERS = $$PWD/glwindow.h \
+          $$PWD/../hellogl2/logo.h
+
+SOURCES = $$PWD/glwindow.cpp \
+          $$PWD/main.cpp \
+          $$PWD/../hellogl2/logo.cpp
+
+RESOURCES += hellogles3.qrc
+
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/hellogles3
+INSTALLS += target

examples/opengl/hellogles3/hellogles3.qrc

@@ -0,0 +1,5 @@
+<RCC>
+  <qresource>
+    <file>qtlogo.png</file>
+  </qresource>
+</RCC>

examples/opengl/hellogles3/main.cpp

@@ -0,0 +1,41 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QGuiApplication>
+#include <QSurfaceFormat>
+#include <QOpenGLContext>
+
+#include "glwindow.h"
+
+// This example demonstrates easy, cross-platform usage of OpenGL ES 3.0 functions via
+// QOpenGLExtraFunctions in an application that works identically on desktop platforms
+// with OpenGL 3.3 and mobile/embedded devices with OpenGL ES 3.0.
+
+// The code is always the same, with the exception of two places: (1) the OpenGL context
+// creation has to have a sufficiently high version number for the features that are in
+// use, and (2) the shader code's version directive is different.
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    QSurfaceFormat fmt;
+    fmt.setDepthBufferSize(24);
+
+    // Request OpenGL 3.3 core or OpenGL ES 3.0.
+    if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
+        qDebug("Requesting 3.3 core context");
+        fmt.setVersion(3, 3);
+        fmt.setProfile(QSurfaceFormat::CoreProfile);
+    } else {
+        qDebug("Requesting 3.0 context");
+        fmt.setVersion(3, 0);
+    }
+
+    QSurfaceFormat::setDefaultFormat(fmt);
+
+    GLWindow glWindow;
+    glWindow.showMaximized();
+
+    return app.exec();
+}