| /**************************************************************************** |
| ** |
| ** 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 |
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| ** 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: |
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| ** the documentation and/or other materials provided with the |
| ** distribution. |
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| ** contributors may be used to endorse or promote products derived |
| ** from this software without specific prior written permission. |
| ** |
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| ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
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| ****************************************************************************/ |
| |
| //! [0] |
| QGLFormat fmt; |
| fmt.setAlpha(true); |
| fmt.setStereo(true); |
| QGLFormat::setDefaultFormat(fmt); |
| //! [0] |
| |
| |
| //! [1] |
| QGLFormat fmt; |
| fmt.setDoubleBuffer(false); // single buffer |
| fmt.setDirectRendering(false); // software rendering |
| MyGLWidget* myWidget = new MyGLWidget(fmt, ...); |
| //! [1] |
| |
| |
| //! [2] |
| QGLFormat fmt; |
| fmt.setOverlay(true); |
| fmt.setStereo(true); |
| MyGLWidget* myWidget = new MyGLWidget(fmt, ...); |
| if (!myWidget->format().stereo()) { |
| // ok, goggles off |
| if (!myWidget->format().hasOverlay()) { |
| qFatal("Cool hardware required"); |
| } |
| } |
| //! [2] |
| |
| |
| //! [3] |
| // The rendering in MyGLWidget depends on using |
| // stencil buffer and alpha channel |
| MyGLWidget::MyGLWidget(QWidget* parent) |
| : QGLWidget(QGLFormat(QGL::StencilBuffer | QGL::AlphaChannel), parent) |
| { |
| if (!format().stencil()) |
| qWarning("Could not get stencil buffer; results will be suboptimal"); |
| if (!format().alpha()) |
| qWarning("Could not get alpha channel; results will be suboptimal"); |
| ... |
| } |
| //! [3] |
| |
| |
| //! [4] |
| QApplication a(argc, argv); |
| QGLFormat f; |
| f.setDoubleBuffer(false); |
| QGLFormat::setDefaultFormat(f); |
| //! [4] |
| |
| |
| //! [5] |
| QGLFormat f = QGLFormat::defaultOverlayFormat(); |
| f.setDoubleBuffer(true); |
| QGLFormat::setDefaultOverlayFormat(f); |
| //! [5] |
| |
| |
| //! [6] |
| // ...continued from above |
| MyGLWidget* myWidget = new MyGLWidget(QGLFormat(QGL::HasOverlay), ...); |
| if (myWidget->format().hasOverlay()) { |
| // Yes, we got an overlay, let's check _its_ format: |
| QGLContext* olContext = myWidget->overlayContext(); |
| if (olContext->format().doubleBuffer()) |
| ; // yes, we got a double buffered overlay |
| else |
| ; // no, only single buffered overlays are available |
| } |
| //! [6] |
| |
| |
| //! [7] |
| QGLContext *cx; |
| // ... |
| QGLFormat f; |
| f.setStereo(true); |
| cx->setFormat(f); |
| if (!cx->create()) |
| exit(); // no OpenGL support, or cannot render on the specified paintdevice |
| if (!cx->format().stereo()) |
| exit(); // could not create stereo context |
| //! [7] |
| |
| |
| //! [8] |
| class MyGLDrawer : public QGLWidget |
| { |
| Q_OBJECT // must include this if you use Qt signals/slots |
| |
| public: |
| MyGLDrawer(QWidget *parent) |
| : QGLWidget(parent) {} |
| |
| protected: |
| |
| void initializeGL() override |
| { |
| // Set up the rendering context, define display lists etc.: |
| ... |
| glClearColor(0.0, 0.0, 0.0, 0.0); |
| glEnable(GL_DEPTH_TEST); |
| ... |
| } |
| |
| void resizeGL(int w, int h) override |
| { |
| // setup viewport, projection etc.: |
| glViewport(0, 0, (GLint)w, (GLint)h); |
| ... |
| glFrustum(...); |
| ... |
| } |
| |
| void paintGL() override |
| { |
| // draw the scene: |
| ... |
| glRotatef(...); |
| glMaterialfv(...); |
| glBegin(GL_QUADS); |
| glVertex3f(...); |
| glVertex3f(...); |
| ... |
| glEnd(); |
| ... |
| } |
| |
| }; |
| //! [8] |