Long live Qt 4.5!

1 files changed, 249 insertions, 0 deletions

diff --git a/examples/opengl/framebufferobject2/glwidget.cpp b/examples/opengl/framebufferobject2/glwidget.cpp
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+/****************************************************************************
+**
+** 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 framebuffer object - make sure to have a current
+    // context before creating it
+    makeCurrent();
+    fbo = new QGLFramebufferObject(512, 512);
+    timerId = startTimer(20);
+    setWindowTitle(tr("OpenGL framebuffer objects 2"));
+}
+
+GLWidget::~GLWidget()
+{
+    glDeleteLists(pbufferList, 1);
+    delete fbo;
+}
+
+void GLWidget::initializeGL()
+{
+    glMatrixMode(GL_MODELVIEW);
+
+    glEnable(GL_CULL_FACE);
+
+    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);
+    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);
+
+        glPushMatrix(); // this state is popped back in the paintGL() function
+    }
+    glEndList();
+
+    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"));
+
+    glPushMatrix(); // push to avoid stack underflow in the first paintGL() call
+}
+
+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()
+{
+    glPopMatrix(); // pop the matrix pushed in the pbuffer list
+
+    // push the projection matrix and the entire GL state before
+    // doing any rendering into our framebuffer object
+    glPushAttrib(GL_ALL_ATTRIB_BITS);
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+
+    glViewport(0, 0, fbo->size().width(), fbo->size().height());
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(-1, 1, -1, 1, -99, 99);
+    glTranslatef(-0.5f, -0.5f, 0.0f);
+    glMatrixMode(GL_MODELVIEW);
+
+    // render to the framebuffer object
+    fbo->bind();
+    glBindTexture(GL_TEXTURE_2D, cubeTexture);
+    glCallList(pbufferList);
+    fbo->release();
+
+    // pop the projection matrix and GL state back for rendering
+    // to the actual widget
+    glPopAttrib();
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+
+    glBindTexture(GL_TEXTURE_2D, fbo->texture());
+    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);
+
+    // 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);
+    glPopMatrix();
+}
+
+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;
+}