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Diffstat (limited to 'examples/opengl/pbuffers/glwidget.cpp')
| -rw-r--r-- | examples/opengl/pbuffers/glwidget.cpp | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/examples/opengl/pbuffers/glwidget.cpp b/examples/opengl/pbuffers/glwidget.cpp new file mode 100644 index 0000000000..f6f89e5a0e --- /dev/null +++ b/examples/opengl/pbuffers/glwidget.cpp @@ -0,0 +1,246 @@ +/**************************************************************************** +** +** 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 examples 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." +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "glwidget.h" +#include <math.h> + +#include "cube.h" + +#include <QGLPixelBuffer> + +#ifndef GL_MULTISAMPLE +#define GL_MULTISAMPLE 0x809D +#endif + +static GLfloat colorArray[][4] = { + {0.243f, 0.423f, 0.125f, 1.0f}, + {0.176f, 0.31f, 0.09f, 1.0f}, + {0.4f, 0.69f, 0.212f, 1.0f}, + {0.317f, 0.553f, 0.161f, 1.0f} +}; + +GLWidget::GLWidget(QWidget *parent) + : QGLWidget(QGLFormat(QGL::SampleBuffers), parent) + , geom(0) + , cube(0) +{ + // create the pbuffer + QGLFormat pbufferFormat = format(); + pbufferFormat.setSampleBuffers(false); + pbuffer = new QGLPixelBuffer(QSize(512, 512), pbufferFormat, this); + setWindowTitle(tr("OpenGL pbuffers")); + initializeGeometry(); +} + +GLWidget::~GLWidget() +{ + pbuffer->releaseFromDynamicTexture(); + glDeleteTextures(1, &dynamicTexture); + delete pbuffer; + + qDeleteAll(cubes); + qDeleteAll(tiles); + delete cube; +} + +void GLWidget::initializeGL() +{ + initCommon(); + glShadeModel(GL_SMOOTH); + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 }; + glLightfv(GL_LIGHT0, GL_POSITION, lightPosition); + initPbuffer(); + cube->startAnimation(); + connect(cube, SIGNAL(changed()), this, SLOT(update())); + for (int i = 0; i < 3; ++i) + { + cubes[i]->startAnimation(); + connect(cubes[i], SIGNAL(changed()), this, SLOT(update())); + } +} + +void GLWidget::paintGL() +{ + pbuffer->makeCurrent(); + drawPbuffer(); + // On direct render platforms, drawing onto the pbuffer context above + // automatically updates the dynamic texture. For cases where rendering + // directly to a texture is not supported, explicitly copy. + if (!hasDynamicTextureUpdate) + pbuffer->updateDynamicTexture(dynamicTexture); + makeCurrent(); + + // Use the pbuffer as a texture to render the scene + glBindTexture(GL_TEXTURE_2D, dynamicTexture); + + // set up to render the scene + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glLoadIdentity(); + glTranslatef(0.0f, 0.0f, -10.0f); + + // draw the background + glPushMatrix(); + glScalef(aspect, 1.0f, 1.0f); + for (int i = 0; i < tiles.count(); ++i) + tiles[i]->draw(); + glPopMatrix(); + + // draw the bouncing cubes + for (int i = 0; i < cubes.count(); ++i) + cubes[i]->draw(); +} + +void GLWidget::initializeGeometry() +{ + geom = new Geometry(); + CubeBuilder cBuilder(geom, 0.5); + cBuilder.setColor(QColor(255, 255, 255, 212)); + // build the 3 bouncing, spinning cubes + for (int i = 3; i > 0; --i) + cubes.append(cBuilder.newCube(QVector3D((float)(i-1), -1.5f, 5 - i))); + + // build the spinning cube which goes in the dynamic texture + cube = cBuilder.newCube(); + cube->removeBounce(); + + // build the background tiles + TileBuilder tBuilder(geom); + tBuilder.setColor(QColor(Qt::white)); + for (int c = -2; c <= +2; ++c) + for (int r = -2; r <= +2; ++r) + tiles.append(tBuilder.newTile(QVector3D(c, r, 0))); + + // graded backdrop for the pbuffer scene + TileBuilder bBuilder(geom, 0.0f, 2.0f); + bBuilder.setColor(QColor(102, 176, 54, 210)); + backdrop = bBuilder.newTile(QVector3D(0.0f, 0.0f, -1.5f)); + backdrop->setColors(colorArray); +} + +void GLWidget::initCommon() +{ + qglClearColor(QColor(Qt::darkGray)); + + glEnable(GL_DEPTH_TEST); + glEnable(GL_CULL_FACE); + glEnable(GL_MULTISAMPLE); + + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable(GL_BLEND); + + glEnable(GL_TEXTURE_2D); + + geom->loadArrays(); +} + +void GLWidget::perspectiveProjection() +{ + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); +#ifdef QT_OPENGL_ES + glFrustumf(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0); +#else + glFrustum(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0); +#endif + glMatrixMode(GL_MODELVIEW); +} + +void GLWidget::orthographicProjection() +{ + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); +#ifdef QT_OPENGL_ES + glOrthof(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0); +#else + glOrtho(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0); +#endif + glMatrixMode(GL_MODELVIEW); +} + +void GLWidget::resizeGL(int width, int height) +{ + glViewport(0, 0, width, height); + aspect = (qreal)width / (qreal)(height ? height : 1); + perspectiveProjection(); +} + +void GLWidget::drawPbuffer() +{ + orthographicProjection(); + + glClearColor(0.0f, 0.0f, 0.0f, 1.0f); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glDisable(GL_TEXTURE_2D); + backdrop->draw(); + glEnable(GL_TEXTURE_2D); + + glBindTexture(GL_TEXTURE_2D, cubeTexture); + glDisable(GL_CULL_FACE); + cube->draw(); + glEnable(GL_CULL_FACE); + + glFlush(); +} + +void GLWidget::initPbuffer() +{ + pbuffer->makeCurrent(); + + cubeTexture = bindTexture(QImage(":res/cubelogo.png")); + + initCommon(); + + // generate a texture that has the same size/format as the pbuffer + dynamicTexture = pbuffer->generateDynamicTexture(); + + // bind the dynamic texture to the pbuffer - this is a no-op under X11 + hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture); + makeCurrent(); +} + +void GLWidget::setAnimationPaused(bool enable) +{ + cube->setAnimationPaused(enable); + for (int i = 0; i < 3; ++i) + cubes[i]->setAnimationPaused(enable); +} |