449 lines
29 KiB
HTML
449 lines
29 KiB
HTML
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<h1 class="title">glwidget.cpp Example File</h1>
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<span class="small-subtitle">opengl/pbuffers/glwidget.cpp</span>
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<!-- $$$opengl/pbuffers/glwidget.cpp-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/</span>
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<span class="preprocessor">#include "glwidget.h"</span>
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<span class="preprocessor">#include <math.h></span>
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<span class="preprocessor">#include "cube.h"</span>
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<span class="preprocessor">#include <QGLPixelBuffer></span>
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<span class="preprocessor">#ifndef GL_MULTISAMPLE</span>
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<span class="preprocessor">#define GL_MULTISAMPLE 0x809D</span>
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<span class="preprocessor">#endif</span>
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<span class="keyword">static</span> GLfloat colorArray<span class="operator">[</span><span class="operator">]</span><span class="operator">[</span><span class="number">4</span><span class="operator">]</span> <span class="operator">=</span> {
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{<span class="number">0.243f</span><span class="operator">,</span> <span class="number">0.423f</span><span class="operator">,</span> <span class="number">0.125f</span><span class="operator">,</span> <span class="number">1.0f</span>}<span class="operator">,</span>
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{<span class="number">0.176f</span><span class="operator">,</span> <span class="number">0.31f</span><span class="operator">,</span> <span class="number">0.09f</span><span class="operator">,</span> <span class="number">1.0f</span>}<span class="operator">,</span>
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{<span class="number">0.4f</span><span class="operator">,</span> <span class="number">0.69f</span><span class="operator">,</span> <span class="number">0.212f</span><span class="operator">,</span> <span class="number">1.0f</span>}<span class="operator">,</span>
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{<span class="number">0.317f</span><span class="operator">,</span> <span class="number">0.553f</span><span class="operator">,</span> <span class="number">0.161f</span><span class="operator">,</span> <span class="number">1.0f</span>}
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};
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GLWidget<span class="operator">::</span>GLWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
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: <span class="type"><a href="qglwidget.html">QGLWidget</a></span>(<span class="type"><a href="qglformat.html">QGLFormat</a></span>(QGL<span class="operator">::</span>SampleBuffers)<span class="operator">,</span> parent)
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<span class="operator">,</span> geom(<span class="number">0</span>)
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<span class="operator">,</span> cube(<span class="number">0</span>)
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{
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<span class="comment">// create the pbuffer</span>
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<span class="type"><a href="qglformat.html">QGLFormat</a></span> pbufferFormat <span class="operator">=</span> format();
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pbufferFormat<span class="operator">.</span>setSampleBuffers(<span class="keyword">false</span>);
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pbuffer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qglpixelbuffer.html">QGLPixelBuffer</a></span>(<span class="type"><a href="qsize.html">QSize</a></span>(<span class="number">512</span><span class="operator">,</span> <span class="number">512</span>)<span class="operator">,</span> pbufferFormat<span class="operator">,</span> <span class="keyword">this</span>);
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setWindowTitle(tr(<span class="string">"OpenGL pbuffers"</span>));
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initializeGeometry();
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}
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GLWidget<span class="operator">::</span><span class="operator">~</span>GLWidget()
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{
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pbuffer<span class="operator">-</span><span class="operator">></span>releaseFromDynamicTexture();
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glDeleteTextures(<span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>dynamicTexture);
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<span class="keyword">delete</span> pbuffer;
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<a href="qtalgorithms.html#qDeleteAll">qDeleteAll</a>(cubes);
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<a href="qtalgorithms.html#qDeleteAll">qDeleteAll</a>(tiles);
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<span class="keyword">delete</span> cube;
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}
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<span class="type">void</span> GLWidget<span class="operator">::</span>initializeGL()
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{
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initCommon();
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glShadeModel(GL_SMOOTH);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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<span class="keyword">static</span> GLfloat lightPosition<span class="operator">[</span><span class="number">4</span><span class="operator">]</span> <span class="operator">=</span> { <span class="number">0.5</span><span class="operator">,</span> <span class="number">5.0</span><span class="operator">,</span> <span class="number">7.0</span><span class="operator">,</span> <span class="number">1.0</span> };
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glLightfv(GL_LIGHT0<span class="operator">,</span> GL_POSITION<span class="operator">,</span> lightPosition);
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initPbuffer();
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cube<span class="operator">-</span><span class="operator">></span>startAnimation();
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connect(cube<span class="operator">,</span> SIGNAL(changed())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(update()));
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<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="number">3</span>; <span class="operator">+</span><span class="operator">+</span>i)
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{
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cubes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>startAnimation();
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connect(cubes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">,</span> SIGNAL(changed())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(update()));
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}
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}
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<span class="type">void</span> GLWidget<span class="operator">::</span>paintGL()
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{
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pbuffer<span class="operator">-</span><span class="operator">></span>makeCurrent();
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drawPbuffer();
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<span class="comment">// On direct render platforms, drawing onto the pbuffer context above</span>
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<span class="comment">// automatically updates the dynamic texture. For cases where rendering</span>
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<span class="comment">// directly to a texture is not supported, explicitly copy.</span>
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<span class="keyword">if</span> (<span class="operator">!</span>hasDynamicTextureUpdate)
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pbuffer<span class="operator">-</span><span class="operator">></span>updateDynamicTexture(dynamicTexture);
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makeCurrent();
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<span class="comment">// Use the pbuffer as a texture to render the scene</span>
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glBindTexture(GL_TEXTURE_2D<span class="operator">,</span> dynamicTexture);
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|
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<span class="comment">// set up to render the scene</span>
|
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glClear(GL_COLOR_BUFFER_BIT <span class="operator">|</span> GL_DEPTH_BUFFER_BIT);
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glLoadIdentity();
|
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glTranslatef(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">10.0f</span>);
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|
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<span class="comment">// draw the background</span>
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glPushMatrix();
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glScalef(aspect<span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
|
|
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> tiles<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i)
|
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tiles<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>draw();
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glPopMatrix();
|
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|
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<span class="comment">// draw the bouncing cubes</span>
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<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> cubes<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i)
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cubes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>draw();
|
|
}
|
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|
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<span class="type">void</span> GLWidget<span class="operator">::</span>initializeGeometry()
|
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{
|
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geom <span class="operator">=</span> <span class="keyword">new</span> Geometry();
|
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CubeBuilder cBuilder(geom<span class="operator">,</span> <span class="number">0.5</span>);
|
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cBuilder<span class="operator">.</span>setColor(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">212</span>));
|
|
<span class="comment">// build the 3 bouncing, spinning cubes</span>
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|
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">3</span>; i <span class="operator">></span> <span class="number">0</span>; <span class="operator">-</span><span class="operator">-</span>i)
|
|
cubes<span class="operator">.</span>append(cBuilder<span class="operator">.</span>newCube(QVector3D((<span class="type">float</span>)(i<span class="operator">-</span><span class="number">1</span>)<span class="operator">,</span> <span class="operator">-</span><span class="number">1.5f</span><span class="operator">,</span> <span class="number">5</span> <span class="operator">-</span> i)));
|
|
|
|
<span class="comment">// build the spinning cube which goes in the dynamic texture</span>
|
|
cube <span class="operator">=</span> cBuilder<span class="operator">.</span>newCube();
|
|
cube<span class="operator">-</span><span class="operator">></span>removeBounce();
|
|
|
|
<span class="comment">// build the background tiles</span>
|
|
TileBuilder tBuilder(geom);
|
|
tBuilder<span class="operator">.</span>setColor(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white));
|
|
<span class="keyword">for</span> (<span class="type">int</span> c <span class="operator">=</span> <span class="operator">-</span><span class="number">2</span>; c <span class="operator"><</span><span class="operator">=</span> <span class="operator">+</span><span class="number">2</span>; <span class="operator">+</span><span class="operator">+</span>c)
|
|
<span class="keyword">for</span> (<span class="type">int</span> r <span class="operator">=</span> <span class="operator">-</span><span class="number">2</span>; r <span class="operator"><</span><span class="operator">=</span> <span class="operator">+</span><span class="number">2</span>; <span class="operator">+</span><span class="operator">+</span>r)
|
|
tiles<span class="operator">.</span>append(tBuilder<span class="operator">.</span>newTile(QVector3D(c<span class="operator">,</span> r<span class="operator">,</span> <span class="number">0</span>)));
|
|
|
|
<span class="comment">// graded backdrop for the pbuffer scene</span>
|
|
TileBuilder bBuilder(geom<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">2.0f</span>);
|
|
bBuilder<span class="operator">.</span>setColor(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">102</span><span class="operator">,</span> <span class="number">176</span><span class="operator">,</span> <span class="number">54</span><span class="operator">,</span> <span class="number">210</span>));
|
|
backdrop <span class="operator">=</span> bBuilder<span class="operator">.</span>newTile(QVector3D(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.5f</span>));
|
|
backdrop<span class="operator">-</span><span class="operator">></span>setColors(colorArray);
|
|
}
|
|
|
|
<span class="type">void</span> GLWidget<span class="operator">::</span>initCommon()
|
|
{
|
|
qglClearColor(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>darkGray));
|
|
|
|
glEnable(GL_DEPTH_TEST);
|
|
glEnable(GL_CULL_FACE);
|
|
glEnable(GL_MULTISAMPLE);
|
|
|
|
glBlendFunc(GL_SRC_ALPHA<span class="operator">,</span> GL_ONE_MINUS_SRC_ALPHA);
|
|
glEnable(GL_BLEND);
|
|
|
|
glEnable(GL_TEXTURE_2D);
|
|
|
|
geom<span class="operator">-</span><span class="operator">></span>loadArrays();
|
|
}
|
|
|
|
<span class="type">void</span> GLWidget<span class="operator">::</span>perspectiveProjection()
|
|
{
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
<span class="preprocessor">#ifdef QT_OPENGL_ES</span>
|
|
glFrustumf(<span class="operator">-</span>aspect<span class="operator">,</span> <span class="operator">+</span>aspect<span class="operator">,</span> <span class="operator">-</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">1.0</span><span class="operator">,</span> <span class="number">4.0</span><span class="operator">,</span> <span class="number">15.0</span>);
|
|
<span class="preprocessor">#else</span>
|
|
glFrustum(<span class="operator">-</span>aspect<span class="operator">,</span> <span class="operator">+</span>aspect<span class="operator">,</span> <span class="operator">-</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">1.0</span><span class="operator">,</span> <span class="number">4.0</span><span class="operator">,</span> <span class="number">15.0</span>);
|
|
<span class="preprocessor">#endif</span>
|
|
glMatrixMode(GL_MODELVIEW);
|
|
}
|
|
|
|
<span class="type">void</span> GLWidget<span class="operator">::</span>orthographicProjection()
|
|
{
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
<span class="preprocessor">#ifdef QT_OPENGL_ES</span>
|
|
glOrthof(<span class="operator">-</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">90.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">90.0</span>);
|
|
<span class="preprocessor">#else</span>
|
|
glOrtho(<span class="operator">-</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">1.0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">90.0</span><span class="operator">,</span> <span class="operator">+</span><span class="number">90.0</span>);
|
|
<span class="preprocessor">#endif</span>
|
|
glMatrixMode(GL_MODELVIEW);
|
|
}
|
|
|
|
<span class="type">void</span> GLWidget<span class="operator">::</span>resizeGL(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height)
|
|
{
|
|
glViewport(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width<span class="operator">,</span> height);
|
|
aspect <span class="operator">=</span> (<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>)width <span class="operator">/</span> (<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>)(height <span class="operator">?</span> height : <span class="number">1</span>);
|
|
perspectiveProjection();
|
|
}
|
|
|
|
<span class="type">void</span> GLWidget<span class="operator">::</span>drawPbuffer()
|
|
{
|
|
orthographicProjection();
|
|
|
|
glClearColor(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
|
|
glClear(GL_COLOR_BUFFER_BIT <span class="operator">|</span> GL_DEPTH_BUFFER_BIT);
|
|
|
|
glDisable(GL_TEXTURE_2D);
|
|
backdrop<span class="operator">-</span><span class="operator">></span>draw();
|
|
glEnable(GL_TEXTURE_2D);
|
|
|
|
glBindTexture(GL_TEXTURE_2D<span class="operator">,</span> cubeTexture);
|
|
glDisable(GL_CULL_FACE);
|
|
cube<span class="operator">-</span><span class="operator">></span>draw();
|
|
glEnable(GL_CULL_FACE);
|
|
|
|
glFlush();
|
|
}
|
|
|
|
<span class="type">void</span> GLWidget<span class="operator">::</span>initPbuffer()
|
|
{
|
|
pbuffer<span class="operator">-</span><span class="operator">></span>makeCurrent();
|
|
|
|
cubeTexture <span class="operator">=</span> bindTexture(<span class="type"><a href="qimage.html">QImage</a></span>(<span class="string">":res/cubelogo.png"</span>));
|
|
|
|
initCommon();
|
|
|
|
<span class="comment">// generate a texture that has the same size/format as the pbuffer</span>
|
|
dynamicTexture <span class="operator">=</span> pbuffer<span class="operator">-</span><span class="operator">></span>generateDynamicTexture();
|
|
|
|
<span class="comment">// bind the dynamic texture to the pbuffer - this is a no-op under X11</span>
|
|
hasDynamicTextureUpdate <span class="operator">=</span> pbuffer<span class="operator">-</span><span class="operator">></span>bindToDynamicTexture(dynamicTexture);
|
|
makeCurrent();
|
|
}
|
|
|
|
<span class="type">void</span> GLWidget<span class="operator">::</span>setAnimationPaused(<span class="type">bool</span> enable)
|
|
{
|
|
cube<span class="operator">-</span><span class="operator">></span>setAnimationPaused(enable);
|
|
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="number">3</span>; <span class="operator">+</span><span class="operator">+</span>i)
|
|
cubes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setAnimationPaused(enable);
|
|
}</pre>
|
|
</div>
|
|
<!-- @@@opengl/pbuffers/glwidget.cpp -->
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="ft">
|
|
<span></span>
|
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</div>
|
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</div>
|
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<div class="footer">
|
|
<p>
|
|
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
|
|
Documentation contributions included herein are the copyrights of
|
|
their respective owners.</p>
|
|
<br />
|
|
<p>
|
|
The documentation provided herein is licensed under the terms of the
|
|
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
|
License version 1.3</a> as published by the Free Software Foundation.</p>
|
|
<p>
|
|
Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
|
www.qt-project.org</a>.</p>
|
|
<br />
|
|
<p>
|
|
Qt and respective logos are trademarks of The Qt Company Ltd
|
|
in Finland and/or other countries worldwide. All other trademarks are property
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of their respective owners. <a title="Privacy Policy"
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href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
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