summaryrefslogtreecommitdiffstats
path: root/doc/src/snippets/code/src_opengl_qgl.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'doc/src/snippets/code/src_opengl_qgl.cpp')
-rw-r--r--doc/src/snippets/code/src_opengl_qgl.cpp172
1 files changed, 172 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_opengl_qgl.cpp b/doc/src/snippets/code/src_opengl_qgl.cpp
new file mode 100644
index 0000000000..6ef049ac90
--- /dev/null
+++ b/doc/src/snippets/code/src_opengl_qgl.cpp
@@ -0,0 +1,172 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** 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 Nokia Corporation 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]
+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()
+ {
+ // 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)
+ {
+ // setup viewport, projection etc.:
+ glViewport(0, 0, (GLint)w, (GLint)h);
+ ...
+ glFrustum(...);
+ ...
+ }
+
+ void paintGL()
+ {
+ // draw the scene:
+ ...
+ glRotatef(...);
+ glMaterialfv(...);
+ glBegin(GL_QUADS);
+ glVertex3f(...);
+ glVertex3f(...);
+ ...
+ glEnd();
+ ...
+ }
+
+};
+//! [8]