diff options
Diffstat (limited to 'src/opengl/doc/snippets')
6 files changed, 432 insertions, 0 deletions
diff --git a/src/opengl/doc/snippets/code/doc_src_qtopengl.cpp b/src/opengl/doc/snippets/code/doc_src_qtopengl.cpp new file mode 100644 index 0000000000..d14a1ede1a --- /dev/null +++ b/src/opengl/doc/snippets/code/doc_src_qtopengl.cpp @@ -0,0 +1,43 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** 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] +#include <QtOpenGL> +//! [0] diff --git a/src/opengl/doc/snippets/code/doc_src_qtopengl.pro b/src/opengl/doc/snippets/code/doc_src_qtopengl.pro new file mode 100644 index 0000000000..72adc2140b --- /dev/null +++ b/src/opengl/doc/snippets/code/doc_src_qtopengl.pro @@ -0,0 +1,3 @@ +#! [1] +QT += opengl +#! [1] diff --git a/src/opengl/doc/snippets/code/src_opengl_qgl.cpp b/src/opengl/doc/snippets/code/src_opengl_qgl.cpp new file mode 100644 index 0000000000..4adc126159 --- /dev/null +++ b/src/opengl/doc/snippets/code/src_opengl_qgl.cpp @@ -0,0 +1,172 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** 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] diff --git a/src/opengl/doc/snippets/code/src_opengl_qglcolormap.cpp b/src/opengl/doc/snippets/code/src_opengl_qglcolormap.cpp new file mode 100644 index 0000000000..04384c1af8 --- /dev/null +++ b/src/opengl/doc/snippets/code/src_opengl_qglcolormap.cpp @@ -0,0 +1,61 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** 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] +#include <QApplication> +#include <QGLColormap> + +int main() +{ + QApplication app(argc, argv); + + MySuperGLWidget widget; // a QGLWidget in color-index mode + QGLColormap colormap; + + // This will fill the colormap with colors ranging from + // black to white. + for (int i = 0; i < colormap.size(); i++) + colormap.setEntry(i, qRgb(i, i, i)); + + widget.setColormap(colormap); + widget.show(); + return app.exec(); +} +//! [0] diff --git a/src/opengl/doc/snippets/code/src_opengl_qglpixelbuffer.cpp b/src/opengl/doc/snippets/code/src_opengl_qglpixelbuffer.cpp new file mode 100644 index 0000000000..e44ac23d1a --- /dev/null +++ b/src/opengl/doc/snippets/code/src_opengl_qglpixelbuffer.cpp @@ -0,0 +1,59 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** 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] +QGLPixelBuffer pbuffer(...); +... +pbuffer.makeCurrent(); +GLuint dynamicTexture = pbuffer.generateDynamicTexture(); +pbuffer.bindToDynamicTexture(dynamicTexture); +... +pbuffer.releaseFromDynamicTexture(); +//! [0] + + +//! [1] +QGLPixelBuffer pbuffer(...); +... +pbuffer.makeCurrent(); +GLuint dynamicTexture = pbuffer.generateDynamicTexture(); +... +pbuffer.updateDynamicTexture(dynamicTexture); +//! [1] diff --git a/src/opengl/doc/snippets/code/src_opengl_qglshaderprogram.cpp b/src/opengl/doc/snippets/code/src_opengl_qglshaderprogram.cpp new file mode 100644 index 0000000000..d0474c1899 --- /dev/null +++ b/src/opengl/doc/snippets/code/src_opengl_qglshaderprogram.cpp @@ -0,0 +1,94 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** 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] +QGLShader shader(QGLShader::Vertex); +shader.compileSourceCode(code); + +QGLShaderProgram program(context); +program.addShader(shader); +program.link(); + +program.bind(); +//! [0] + +//! [1] +program.addShaderFromSourceCode(QGLShader::Vertex, + "attribute highp vec4 vertex;\n" + "uniform highp mat4 matrix;\n" + "void main(void)\n" + "{\n" + " gl_Position = matrix * vertex;\n" + "}"); +program.addShaderFromSourceCode(QGLShader::Fragment, + "uniform mediump vec4 color;\n" + "void main(void)\n" + "{\n" + " gl_FragColor = color;\n" + "}"); +program.link(); +program.bind(); + +int vertexLocation = program.attributeLocation("vertex"); +int matrixLocation = program.uniformLocation("matrix"); +int colorLocation = program.uniformLocation("color"); +//! [1] + +//! [2] +static GLfloat const triangleVertices[] = { + 60.0f, 10.0f, 0.0f, + 110.0f, 110.0f, 0.0f, + 10.0f, 110.0f, 0.0f +}; + +QColor color(0, 255, 0, 255); + +QMatrix4x4 pmvMatrix; +pmvMatrix.ortho(rect()); + +program.enableAttributeArray(vertexLocation); +program.setAttributeArray(vertexLocation, triangleVertices, 3); +program.setUniformValue(matrixLocation, pmvMatrix); +program.setUniformValue(colorLocation, color); + +glDrawArrays(GL_TRIANGLES, 0, 3); + +program.disableAttributeArray(vertexLocation); +//! [2] |