【Qt OpenGL教程】16：看起来很酷的雾源码

/* Qt OpenGL Tutorial - Lesson 16 nehewidget.cpp v 1.00 2002/12/20 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" GLfloat lightAmbient[4] = { 0.5, 0.5, 0.5, 1.0 }; GLfloat lightDiffuse[4] = { 1.0, 1.0, 1.0, 1.0 }; GLfloat lightPosition[4] = { 0.0, 0.0, 2.0, 1.0 }; GLuint fogMode[3] = { GL_EXP, GL_EXP2, GL_LINEAR }; GLfloat fogColor[4] = { 0.5, 0.5, 0.5, 1.0 }; NeHeWidget::NeHeWidget( QWidget* parent, const char* name, bool fs ) : QGLWidget( parent, name ) { xRot = yRot = zRot = 0.0; zoom = -5.0; xSpeed = ySpeed = 0.0; filter = 0; light = false; fogFilter = 0; fullscreen = fs; setGeometry( 0, 0, 640, 480 ); setCaption( "Chris Aliotta & NeHe's Fog Tutorial" ); if ( fullscreen ) showFullScreen(); } NeHeWidget::~NeHeWidget() { } void NeHeWidget::initializeGL() { loadGLTextures(); glEnable( GL_TEXTURE_2D ); glShadeModel( GL_SMOOTH ); glClearColor( 0.5, 0.5, 0.5, 1.0 ); glClearDepth( 1.0 ); glEnable( GL_DEPTH_TEST ); glDepthFunc( GL_LEQUAL ); glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ); glLightfv( GL_LIGHT1, GL_AMBIENT, lightAmbient ); glLightfv( GL_LIGHT1, GL_DIFFUSE, lightDiffuse ); glLightfv( GL_LIGHT1, GL_POSITION, lightPosition ); glEnable( GL_LIGHT1 ); glFogi( GL_FOG_MODE, fogMode[fogFilter] ); glFogfv( GL_FOG_COLOR, fogColor ); glFogf( GL_FOG_DENSITY, 0.35 ); glHint( GL_FOG_HINT, GL_DONT_CARE ); glFogf( GL_FOG_START, 1.0 ); glFogf( GL_FOG_END, 5.0 ); glEnable( GL_FOG ); } void NeHeWidget::paintGL() { glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glLoadIdentity(); glTranslatef( 0.0, 0.0, zoom ); glRotatef( xRot, 1.0, 0.0, 0.0 ); glRotatef( yRot, 0.0, 1.0, 0.0 ); glBindTexture( GL_TEXTURE_2D, texture[filter] ); glBegin( GL_QUADS ); glNormal3f( 0.0, 0.0, 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 ); glNormal3f( 0.0, 0.0, -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 ); glNormal3f( 0.0, 1.0, 0.0 ); 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 ); glNormal3f( 0.0, -1.0, 0.0 ); 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 ); glNormal3f( 1.0, 0.0, 0.0 ); 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 ); glNormal3f( -1.0, 0.0, 0.0 ); 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 += xSpeed; yRot += ySpeed; } 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::keyPressEvent( QKeyEvent *e ) { switch ( e->key() ) { case Qt::Key_L: light = !light; if ( !light ) { glDisable( GL_LIGHTING ); } else { glEnable( GL_LIGHTING ); } updateGL(); break; case Qt::Key_F: filter += 1;; if ( filter > 2 ) { filter = 0; } updateGL(); break; case Qt::Key_G: fogFilter += 1;; if ( fogFilter > 2 ) { fogFilter = 0; } glFogi( GL_FOG_MODE, fogMode[fogFilter] ); updateGL(); break; case Qt::Key_Prior: zoom -= 0.2; updateGL(); break; case Qt::Key_Next: zoom += 0.2; updateGL(); break; case Qt::Key_Up: xSpeed -= 0.01; updateGL(); break; case Qt::Key_Down: xSpeed += 0.01; updateGL(); break; case Qt::Key_Right: ySpeed += 0.01; updateGL(); break; case Qt::Key_Left: ySpeed -= 0.01; updateGL(); break; case Qt::Key_F2: fullscreen = !fullscreen; if ( fullscreen ) { showFullScreen(); } else { showNormal(); setGeometry( 0, 0, 640, 480 ); } update(); break; case Qt::Key_Escape: close(); } } void NeHeWidget::loadGLTextures() { QImage tex, buf; if ( !buf.load( "./data/Crate.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( 3, &texture[0] ); glBindTexture( GL_TEXTURE_2D, texture[0] ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); glTexImage2D( GL_TEXTURE_2D, 0, 3, tex.width(), tex.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, tex.bits() ); glBindTexture( GL_TEXTURE_2D, texture[1] ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); glTexImage2D( GL_TEXTURE_2D, 0, 3, tex.width(), tex.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, tex.bits() ); glBindTexture( GL_TEXTURE_2D, texture[2] ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); gluBuild2DMipmaps( GL_TEXTURE_2D, GL_RGB, tex.width(), tex.height(), GL_RGBA, GL_UNSIGNED_BYTE, tex.bits() ); }