Qt下使用OpenGL（6）-根据NeHe的教程改写的

#ifndef NEHEWIDGET_H
#define NEHEWIDGET_H

#include <QtOpenGL>
//#include "ui_nehewidget.h"

#include <qgl.h>

class nehewidget : public QGLWidget
{
Q_OBJECT

public:
nehewidget(QWidget *parent = 0,bool fs=false);
~nehewidget();

protected:
void initializeGL();
void paintGL();
void resizeGL(int w,int h);
void loadGLTextures();

void keyPressEvent(QKeyEvent *e);

bool fullscreen;
GLfloat xrot,yrot,zrot;
GLuint texture[1];
};

#endif // NEHEWIDGET_H

#include "nehewidget.h"

#include <gl/GL.h>
#include <gl/GLU.h>

#include <QKeyEvent>
#include <QImage>
#include <QColor>

nehewidget::nehewidget(QWidget *parent,bool fs)
: QGLWidget(parent)
{
fullscreen=fs;
setGeometry(100,100,640,480);
//	setCaption("OpenGL window"); //这个函数，不支持了吧？
setWindowTitle("OpenGL Window");
if(fullscreen) showFullScreen();
}

nehewidget::~nehewidget()
{

}

void nehewidget::initializeGL()
{
loadGLTextures();
glEnable(GL_TEXTURE_2D);

glShadeModel(GL_SMOOTH);
glClearColor(0,0,0,0);
glClearDepth(1.0);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
}

void nehewidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();

glTranslatef(0.0,0.0,0.0);
glRotatef(xrot,1.0,0.0,0.0);
glRotatef(yrot,0.0,1.0,0.0);
glRotatef(zrot,0.0,0.0,1.0);
glBindTexture(GL_TEXTURE_2D,texture[0]);
glBegin(GL_QUADS);
glTexCoord2f(0.0,0.0);glVertex3f(-0.2,-0.2,0.2);
glTexCoord2f(1.0,0.0);glVertex3f(0.2,-0.2,0.2);
glTexCoord2f(1.0,1.0);glVertex3f(0.2,0.2,0.2);
glTexCoord2f(0.0,1.0);glVertex3f(-0.2,0.2,0.2);

glTexCoord2f(1.0,0.0);glVertex3f(-0.2,-0.2,-0.2);
glTexCoord2f(1.0,1.0);glVertex3f(-0.2,0.2,-0.2);
glTexCoord2f(0.0,1.0);glVertex3f(0.2,0.2,-0.2);
glTexCoord2f(0.0,0.0);glVertex3f(0.2,-0.2,-0.2);

glTexCoord2f(0.0,1.0);glVertex3f(-0.2,0.2,-0.2);
glTexCoord2f(0.0,0.0);glVertex3f(-0.2,0.2,0.2);
glTexCoord2f(1.0,0.0);glVertex3f(0.2,0.2,0.2);
glTexCoord2f(1.0,1.0);glVertex3f(0.2,0.2,-0.2);

glTexCoord2f(1.0,1.0);glVertex3f(-0.2,-0.2,-0.2);
glTexCoord2f(0.0,1.0);glVertex3f(0.2,-0.2,-0.2);
glTexCoord2f(0.0,0.0);glVertex3f(0.2,-0.2,-0.2);
glTexCoord2f(1.0,0.0);glVertex3f(-0.2,-0.2,0.2);

glTexCoord2f(1.0,0.0);glVertex3f(0.2,-0.2,-0.2);
glTexCoord2f(1.0,1.0);glVertex3f(0.2,0.2,-0.2);
glTexCoord2f(0.0,1.0);glVertex3f(0.2,0.2,0.2);
glTexCoord2f(0.0,0.0);glVertex3f(0.2,-0.2,0.2);

glTexCoord2f(0.0,0.0);glVertex3f(-0.2,-0.2,-0.2);
glTexCoord2f(1.0,0.0);glVertex3f(-0.2,-0.2,0.2);
glTexCoord2f(1.0,1.0);glVertex3f(-0.2,0.2,0.2);
glTexCoord2f(0.0,1.0);glVertex3f(-0.2,0.2,-0.2);
glEnd();
xrot+=3;
yrot+=4;
zrot+=2;
}

void nehewidget::resizeGL(int w,int h)
{
if(h==0) h=1;
glViewport(0,0,(GLint)w,(GLint)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//下面这个函数在Qt和OpenGL新版本中都不支持了！先注释掉吧，以后不得不用时再想办法
//	gluPerspective(45.0,(GLfloat)w/(GLfloat)h,0.1,100.0);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

void nehewidget::keyPressEvent(QKeyEvent *e)
{
switch(e->key()) {
case Qt::Key_F2:
fullscreen=!fullscreen;
if(fullscreen) showFullScreen();
else {
showNormal();
setGeometry(0,0,640,480);
}
updateGL();
break;
case Qt::Key_Escape:
close();
}
}

void nehewidget::loadGLTextures()
{
QImage tex,buf;
if(!buf.load("texture.bmp")) {
qWarning("Please use single-color instead");
QImage dummy(128,128,QImage::Format_RGB32);
dummy.fill(Qt::red);
buf=dummy;
}
tex=QGLWidget::convertToGLFormat(buf);
glGenTextures(1,&texture[0]);
glBindTexture(GL_TEXTURE_2D,texture[0]);
glTexImage2D(GL_TEXTURE_2D,0,3,tex.width(),tex.height(),0,GL_RGB,GL_UNSIGNED_BYTE,tex.bits());
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
}