/*    Qt OpenGL Tutorial - Lesson 06    nehewidget.cpp    v 1.00    2002/12/18    Copyright (C) 2002 Cavendish                       cavendish@qiliang.net                       http://www.qiliang.net/nehe_qt    This program is free software; you can redistribute it and/or modify    it under the terms of the GNU General Public License as published by    the Free Software Foundation; either version 2 of the License, or    (at your option) any later version.*/#include <qimage.h>#include "nehewidget.h"NeHeWidget::NeHeWidget( QWidget* parent, const char* name, bool fs )    : QGLWidget( parent, name ){  xRot = yRot = zRot = 0.0;  fullscreen = fs;  setGeometry( 0, 0, 640, 480 );  setCaption( "NeHe's Texture Mapping Tutorial" );  if ( fullscreen )    showFullScreen();}NeHeWidget::~NeHeWidget(){}void NeHeWidget::paintGL(){  glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );  glLoadIdentity();  glTranslatef(  0.0,  0.0, -5.0 );    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( -1.0, -1.0,  1.0 );    glTexCoord2f( 1.0, 0.0 ); glVertex3f(  1.0, -1.0,  1.0 );    glTexCoord2f( 1.0, 1.0 ); glVertex3f(  1.0,  1.0,  1.0 );    glTexCoord2f( 0.0, 1.0 ); glVertex3f( -1.0,  1.0,  1.0 );      glTexCoord2f( 1.0, 0.0 ); glVertex3f( -1.0, -1.0, -1.0 );    glTexCoord2f( 1.0, 1.0 ); glVertex3f( -1.0,  1.0, -1.0 );    glTexCoord2f( 0.0, 1.0 ); glVertex3f(  1.0,  1.0, -1.0 );    glTexCoord2f( 0.0, 0.0 ); glVertex3f(  1.0, -1.0, -1.0 );    glTexCoord2f( 0.0, 1.0 ); glVertex3f( -1.0,  1.0, -1.0 );    glTexCoord2f( 0.0, 0.0 ); glVertex3f( -1.0,  1.0,  1.0 );    glTexCoord2f( 1.0, 0.0 ); glVertex3f(  1.0,  1.0,  1.0 );    glTexCoord2f( 1.0, 1.0 ); glVertex3f(  1.0,  1.0, -1.0 );    glTexCoord2f( 1.0, 1.0 ); glVertex3f( -1.0, -1.0, -1.0 );    glTexCoord2f( 0.0, 1.0 ); glVertex3f(  1.0, -1.0, -1.0 );    glTexCoord2f( 0.0, 0.0 ); glVertex3f(  1.0, -1.0,  1.0 );    glTexCoord2f( 1.0, 0.0 ); glVertex3f( -1.0, -1.0,  1.0 );    glTexCoord2f( 1.0, 0.0 ); glVertex3f(  1.0, -1.0, -1.0 );    glTexCoord2f( 1.0, 1.0 ); glVertex3f(  1.0,  1.0, -1.0 );    glTexCoord2f( 0.0, 1.0 ); glVertex3f(  1.0,  1.0,  1.0 );    glTexCoord2f( 0.0, 0.0 ); glVertex3f(  1.0, -1.0,  1.0 );    glTexCoord2f( 0.0, 0.0 ); glVertex3f( -1.0, -1.0, -1.0 );    glTexCoord2f( 1.0, 0.0 ); glVertex3f( -1.0, -1.0,  1.0 );    glTexCoord2f( 1.0, 1.0 ); glVertex3f( -1.0,  1.0,  1.0 );    glTexCoord2f( 0.0, 1.0 ); glVertex3f( -1.0,  1.0, -1.0 );  glEnd();    xRot += 0.3;  yRot += 0.2;  zRot += 0.4;}void NeHeWidget::initializeGL(){  loadGLTextures();  glEnable( GL_TEXTURE_2D );  glShadeModel( GL_SMOOTH );  glClearColor( 0.0, 0.0, 0.0, 0.5 );  glClearDepth( 1.0 );  glEnable( GL_DEPTH_TEST );  glDepthFunc( GL_LEQUAL );  glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );}void NeHeWidget::resizeGL( int width, int height ){  if ( height == 0 )  {    height = 1;  }  glViewport( 0, 0, (GLint)width, (GLint)height );  glMatrixMode( GL_PROJECTION );  glLoadIdentity();  gluPerspective( 45.0, (GLfloat)width/(GLfloat)height, 0.1, 100.0 );  glMatrixMode( GL_MODELVIEW );  glLoadIdentity();}void NeHeWidget::loadGLTextures(){  QImage tex, buf;  if ( !buf.load( "./data/NeHe.bmp" ) )  {    qWarning( "Could not read image file, using single-color instead." );    QImage dummy( 128, 128, 32 );    dummy.fill( Qt::green.rgb() );    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_RGBA, GL_UNSIGNED_BYTE, tex.bits() );        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );  glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );}void NeHeWidget::keyPressEvent( QKeyEvent *e ){  switch ( e->key() )  {  case Qt::Key_F2:    fullscreen = !fullscreen;    if ( fullscreen )    {      showFullScreen();    }    else    {      showNormal();      setGeometry( 0, 0, 640, 480 );    }    update();    break;  case Qt::Key_Escape:    close();  }}