diff options
Diffstat (limited to 'src/widgets/doc/snippets/code/doc_gui_widgets_qopenglwidget.cpp')
-rw-r--r-- | src/widgets/doc/snippets/code/doc_gui_widgets_qopenglwidget.cpp | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/widgets/doc/snippets/code/doc_gui_widgets_qopenglwidget.cpp b/src/widgets/doc/snippets/code/doc_gui_widgets_qopenglwidget.cpp new file mode 100644 index 0000000000..bc279e4406 --- /dev/null +++ b/src/widgets/doc/snippets/code/doc_gui_widgets_qopenglwidget.cpp @@ -0,0 +1,109 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Digia Plc and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +class MyGLWidget : public QOpenGLWidget +{ +public: + MyGLWidget(QWidget *parent) : QOpenGLWidget(parent) { } + +protected: + void initializeGL() + { + // Set up the rendering context, load shaders and other resources, etc.: + QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions(); + f->glClearColor(1.0f, 1.0f, 1.0f, 1.0f); + ... + } + + void resizeGL(int w, int h) + { + // Update projection matrix and other size related settings: + m_projection.setToIdentity(); + m_projection.perspective(45.0f, w / float(h), 0.01f, 100.0f); + ... + } + + void paintGL() + { + // Draw the scene: + QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions(); + f->glClear(GL_COLOR_BUFFER_BIT); + ... + } + +}; +//! [0] + +//! [1] +class MyGLWidget : public QOpenGLWidget, protected QOpenGLFunctions +{ + ... + void initializeGL() + { + initializeOpenGLFunctions(); + glClearColor(...); + ... + } + ... +}; +//! [1] + +//! [2] +QOpenGLWidget *widget = new QOpenGLWidget(parent); +QSurfaceFormat format; +format.setDepthBufferSize(24); +format.setStencilBufferSize(8); +format.setVersion(3, 2); +format.setProfile(QSurfaceFormat::CoreProfile); +widget->setFormat(format); // must be called before the widget or its parent window gets shown +//! [2] + +//! [3] + ... + void paintGL() + { + QOpenGLFunctions_3_2_Core *f = QOpenGLContext::currentContext()->versionFunctions<QOpenGLFunctions_3_2_Core>(); + ... + f->glDrawArraysInstanced(...); + ... + } + ... +//! [3] |