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Diffstat (limited to 'examples/opengl/pbuffers/glwidget.cpp')
| -rw-r--r-- | examples/opengl/pbuffers/glwidget.cpp | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/examples/opengl/pbuffers/glwidget.cpp b/examples/opengl/pbuffers/glwidget.cpp new file mode 100644 index 0000000..4dfbcf4 --- /dev/null +++ b/examples/opengl/pbuffers/glwidget.cpp @@ -0,0 +1,260 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "glwidget.h" +#include <QtGui/QImage> + +#include <math.h> + +static GLint cubeArray[][3] = { + {0, 0, 0}, {0, 1, 0}, {1, 1, 0}, {1, 0, 0}, + {0, 0, 1}, {1, 0, 1}, {1, 1, 1}, {0, 1, 1}, + {0, 0, 0}, {1, 0, 0}, {1, 0, 1}, {0, 0, 1}, + {0, 1, 0}, {0, 1, 1}, {1, 1, 1}, {1, 1, 0}, + {0, 1, 0}, {0, 0, 0}, {0, 0, 1}, {0, 1, 1}, + {1, 0, 0}, {1, 1, 0}, {1, 1, 1}, {1, 0, 1} +}; + +static GLint cubeTextureArray[][2] = { + {0, 0}, {1, 0}, {1, 1}, {0, 1}, + {0, 0}, {0, 1}, {1, 1}, {1, 0}, + {0, 0}, {1, 0}, {1, 1}, {0, 1}, + {1, 0}, {0, 0}, {0, 1}, {1, 1}, + {0, 0}, {1, 0}, {1, 1}, {0, 1}, + {1, 0}, {0, 0}, {0, 1}, {1, 1} +}; + +static GLint faceArray[][2] = { + {1, -1}, {1, 1}, {-1, 1}, {-1, -1} +}; + +static GLubyte colorArray[][4] = { + {102, 176, 54, 255}, + {81, 141, 41, 255}, + {62, 108, 32, 255}, + {45, 79, 23, 255} +}; + +GLWidget::GLWidget(QWidget *parent) + : QGLWidget(QGLFormat(QGL::SampleBuffers), parent) +{ + // create the pbuffer + pbuffer = new QGLPixelBuffer(QSize(512, 512), format(), this); + timerId = startTimer(20); + setWindowTitle(tr("OpenGL pbuffers")); +} + +GLWidget::~GLWidget() +{ + pbuffer->releaseFromDynamicTexture(); + glDeleteTextures(1, &dynamicTexture); + glDeleteLists(pbufferList, 1); + delete pbuffer; +} + +void GLWidget::initializeGL() +{ + glMatrixMode(GL_MODELVIEW); + + glEnable(GL_CULL_FACE); + initCommon(); + initPbuffer(); + + for (int i = 0; i < 3; ++i) { + yOffs[i] = 0.0f; + xInc[i] = 0.005f; + rot[i] = 0.0f; + } + xOffs[0]= 0.0f; + xOffs[1]= 0.5f; + xOffs[2]= 1.0f; + + cubeTexture = bindTexture(QImage(":res/cubelogo.png")); +} + +void GLWidget::resizeGL(int w, int h) +{ + glViewport(0, 0, w, h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + float aspect = w/(float)(h ? h : 1); + glFrustum(-aspect, aspect, -1, 1, 10, 100); + glTranslatef(-0.5f, -0.5f, -0.5f); + glTranslatef(0.0f, 0.0f, -15.0f); +} + +void GLWidget::paintGL() +{ + // draw a spinning cube into the pbuffer.. + pbuffer->makeCurrent(); + glBindTexture(GL_TEXTURE_2D, cubeTexture); + glCallList(pbufferList); + glFlush(); + + // rendering directly to a texture is not supported on X11 and + // some Windows implementations, unfortunately + if (!hasDynamicTextureUpdate) + pbuffer->updateDynamicTexture(dynamicTexture); + + // ..and use the pbuffer contents as a texture when rendering the + // background and the bouncing cubes + makeCurrent(); + glBindTexture(GL_TEXTURE_2D, dynamicTexture); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + // draw the background + glMatrixMode(GL_MODELVIEW); + glPushMatrix(); + glLoadIdentity(); + glMatrixMode(GL_PROJECTION); + glPushMatrix(); + glLoadIdentity(); + + glVertexPointer(2, GL_INT, 0, faceArray); + glTranslatef(-1.2f, -0.8f, 0.0f); + glScalef(0.2f, 0.2f, 0.2f); + for (int y = 0; y < 5; ++y) { + for (int x = 0; x < 5; ++x) { + glTranslatef(2.0f, 0, 0); + glColor4f(0.8, 0.8, 0.8, 1.0); + glDrawArrays(GL_QUADS, 0, 4); + } + glTranslatef(-10.0f, 2.0f, 0); + } + glVertexPointer(3, GL_INT, 0, cubeArray); + + glPopMatrix(); + glMatrixMode(GL_MODELVIEW); + glPopMatrix(); + + // draw the bouncing cubes + drawCube(0, 0.0f, 1.5f, 2.5f, 1.5f); + drawCube(1, 1.0f, 2.0f, 2.5f, 2.0f); + drawCube(2, 2.0f, 3.5f, 2.5f, 2.5f); +} + +void GLWidget::drawCube(int i, GLfloat z, GLfloat rotation, GLfloat jmp, GLfloat amp) +{ + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(xOffs[i], yOffs[i], z); + glTranslatef(0.5f, 0.5f, 0.5f); + GLfloat scale = 0.75 + i*(0.25f/2); + glScalef(scale, scale, scale); + glRotatef(rot[i], 1.0f, 1.0f, 1.0f); + glTranslatef(-0.5f, -0.5f, -0.5f); + + glColor4f(1.0f, 1.0f, 1.0f, 0.8f); + glDrawArrays(GL_QUADS, 0, 24); + + if (xOffs[i] > 1.0f || xOffs[i] < -1.0f) { + xInc[i] = -xInc[i]; + xOffs[i] = xOffs[i] > 1.0f ? 1.0f : -1.0f; + } + xOffs[i] += xInc[i]; + yOffs[i] = qAbs(cos((-3.141592f * jmp) * xOffs[i]) * amp) - 1; + rot[i] += rotation; +} + +void GLWidget::initCommon() +{ + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + glVertexPointer(3, GL_INT, 0, cubeArray); + glTexCoordPointer(2, GL_INT, 0, cubeTextureArray); + glColorPointer(4, GL_UNSIGNED_BYTE, 0, colorArray); + + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable(GL_BLEND); + glEnable(GL_TEXTURE_2D); + glEnable(GL_DEPTH_TEST); + + glClearColor(1.0f, 1.0f, 1.0f, 1.0f); +} + +void GLWidget::initPbuffer() +{ + // set up the pbuffer context + pbuffer->makeCurrent(); + initCommon(); + + glViewport(0, 0, pbuffer->size().width(), pbuffer->size().height()); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1, 1, -1, 1, -99, 99); + glTranslatef(-0.5f, -0.5f, 0.0f); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + + pbufferList = glGenLists(1); + glNewList(pbufferList, GL_COMPILE); + { + glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); + + // draw cube background + glPushMatrix(); + glLoadIdentity(); + glTranslatef(0.5f, 0.5f, -2.0f); + glDisable(GL_TEXTURE_2D); + glEnableClientState(GL_COLOR_ARRAY); + glVertexPointer(2, GL_INT, 0, faceArray); + glDrawArrays(GL_QUADS, 0, 4); + glVertexPointer(3, GL_INT, 0, cubeArray); + glDisableClientState(GL_COLOR_ARRAY); + glEnable(GL_TEXTURE_2D); + glPopMatrix(); + + // draw cube + glTranslatef(0.5f, 0.5f, 0.5f); + glRotatef(3.0f, 1.0f, 1.0f, 1.0f); + glTranslatef(-0.5f, -0.5f, -0.5f); + glColor4f(0.9f, 0.9f, 0.9f, 1.0f); + glDrawArrays(GL_QUADS, 0, 24); + } + glEndList(); + // 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(); +} + |