1 files changed, 177 insertions, 0 deletions
diff --git a/examples/opengl/openglwindow/main.cpp b/examples/opengl/openglwindow/main.cpp
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+++ b/examples/opengl/openglwindow/main.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation 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 "openglwindow.h"
+
+#include <QGuiApplication>
+#include <QMatrix4x4>
+#include <QOpenGLShaderProgram>
+#include <QScreen>
+#include <QtMath>
+
+
+//! [1]
+class TriangleWindow : public OpenGLWindow
+{
+public:
+    using OpenGLWindow::OpenGLWindow;
+
+    void initialize() override;
+    void render() override;
+
+private:
+    GLint m_posAttr = 0;
+    GLint m_colAttr = 0;
+    GLint m_matrixUniform = 0;
+
+    QOpenGLShaderProgram *m_program = nullptr;
+    int m_frame = 0;
+};
+//! [1]
+
+//! [2]
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    QSurfaceFormat format;
+    format.setSamples(16);
+
+    TriangleWindow window;
+    window.setFormat(format);
+    window.resize(640, 480);
+    window.show();
+
+    window.setAnimating(true);
+
+    return app.exec();
+}
+//! [2]
+
+
+//! [3]
+static const char *vertexShaderSource =
+    "attribute highp vec4 posAttr;\n"
+    "attribute lowp vec4 colAttr;\n"
+    "varying lowp vec4 col;\n"
+    "uniform highp mat4 matrix;\n"
+    "void main() {\n"
+    "   col = colAttr;\n"
+    "   gl_Position = matrix * posAttr;\n"
+    "}\n";
+
+static const char *fragmentShaderSource =
+    "varying lowp vec4 col;\n"
+    "void main() {\n"
+    "   gl_FragColor = col;\n"
+    "}\n";
+//! [3]
+
+//! [4]
+void TriangleWindow::initialize()
+{
+    m_program = new QOpenGLShaderProgram(this);
+    m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource);
+    m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource);
+    m_program->link();
+    m_posAttr = m_program->attributeLocation("posAttr");
+    Q_ASSERT(m_posAttr != -1);
+    m_colAttr = m_program->attributeLocation("colAttr");
+    Q_ASSERT(m_colAttr != -1);
+    m_matrixUniform = m_program->uniformLocation("matrix");
+    Q_ASSERT(m_matrixUniform != -1);
+}
+//! [4]
+
+//! [5]
+void TriangleWindow::render()
+{
+    const qreal retinaScale = devicePixelRatio();
+    glViewport(0, 0, width() * retinaScale, height() * retinaScale);
+
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    m_program->bind();
+
+    QMatrix4x4 matrix;
+    matrix.perspective(60.0f, 4.0f / 3.0f, 0.1f, 100.0f);
+    matrix.translate(0, 0, -2);
+    matrix.rotate(100.0f * m_frame / screen()->refreshRate(), 0, 1, 0);
+
+    m_program->setUniformValue(m_matrixUniform, matrix);
+
+    static const GLfloat vertices[] = {
+         0.0f,  0.707f,
+        -0.5f, -0.5f,
+         0.5f, -0.5f
+    };
+
+    static const GLfloat colors[] = {
+        1.0f, 0.0f, 0.0f,
+        0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 1.0f
+    };
+
+    glVertexAttribPointer(m_posAttr, 2, GL_FLOAT, GL_FALSE, 0, vertices);
+    glVertexAttribPointer(m_colAttr, 3, GL_FLOAT, GL_FALSE, 0, colors);
+
+    glEnableVertexAttribArray(m_posAttr);
+    glEnableVertexAttribArray(m_colAttr);
+
+    glDrawArrays(GL_TRIANGLES, 0, 3);
+
+    glDisableVertexAttribArray(m_colAttr);
+    glDisableVertexAttribArray(m_posAttr);
+
+    m_program->release();
+
+    ++m_frame;
+}
+//! [5]