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<pre><span class="comment"> /****************************************************************************
**
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** This file is part of the examples of the Qt Toolkit.
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** GNU Lesser General Public License Usage
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** GNU General Public License Usage
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#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)
{
<span class="comment">// create the framebuffer object - make sure to have a current</span>
<span class="comment">// context before creating it</span>
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);
<span class="comment">// draw cube background</span>
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();
<span class="comment">// draw cube</span>
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(); <span class="comment">// this state is popped back in the paintGL() function</span>
}
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(); <span class="comment">// push to avoid stack underflow in the first paintGL() call</span>
}
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(); <span class="comment">// pop the matrix pushed in the pbuffer list</span>
<span class="comment">// push the projection matrix and the entire GL state before</span>
<span class="comment">// doing any rendering into our framebuffer object</span>
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);
<span class="comment">// render to the framebuffer object</span>
fbo->bind();
glBindTexture(GL_TEXTURE_2D, cubeTexture);
glCallList(pbufferList);
fbo->release();
<span class="comment">// pop the projection matrix and GL state back for rendering</span>
<span class="comment">// to the actual widget</span>
glPopAttrib();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glBindTexture(GL_TEXTURE_2D, fbo->texture());
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
<span class="comment">// draw the background</span>
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(0.8f, 0.8f, 0.8f, 1.0f);
glDrawArrays(GL_QUADS, 0, 4);
}
glTranslatef(-10.0f, 2.0f, 0);
}
glVertexPointer(3, GL_INT, 0, cubeArray);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
<span class="comment">// draw the bouncing cubes</span>
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;
}</pre>
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