Qt下使用OpenGL（16）-根据NeHe的教程改写的

第十六课：雾

在第七课的代码基础上修改。

nehewidget.h 文件：

#ifndef NEHEWIDGET_H#define NEHEWIDGET_H#include <QtOpenGL/QGLWidget>//#include "ui_nehewidget.h"#include <qgl.h>class nehewidget : public QGLWidget{Q_OBJECTpublic:nehewidget(QWidget *parent = 0,bool fs=false);~nehewidget();protected:void initializeGL();void paintGL();void resizeGL(int w,int h);void keyPressEvent(QKeyEvent *e);void loadGLTextures();bool fullscreen;GLfloat xrot,yrot,zrot;GLfloat zoom,xspeed,yspeed;GLuint texture[3],filter;bool light;GLuint fogfilter;};#endif // NEHEWIDGET_H

 

nehewidget.cpp 文件：

#include "nehewidget.h"#include <gl/GLU.h>#include <QKeyEvent>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]={0.0,0.0,0.0,1.0};GLuint fogmode[3]={GL_EXP,GL_EXP2,GL_LINEAR};GLfloat fogcolor[4]={0.5,0.5,0.5,1.0};nehewidget::nehewidget(QWidget *parent,bool fs): QGLWidget(parent){xrot=0.0;yrot=0.0;zrot=0.0;zoom=0.0;xspeed=yspeed=2.0;filter=0;light=false;fogfilter=0;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);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,0.0);glFogf(GL_FOG_END,0.0);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(-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);glNormal3f(0.0,0.0,-1.0);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);glNormal3f(0.0,1.0,0.0);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);glNormal3f(0.0,-1.0,0.0);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);glNormal3f(1.0,0.0,0.0);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);glNormal3f(-1.0,0.0,0.0);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+=xspeed;yrot+=yspeed;}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_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_PageUp:zoom-=0.2;updateGL();break;case Qt::Key_PageDown:zoom+=0.2;updateGL();break;case Qt::Key_Up:xspeed-=0.2;updateGL();break;case Qt::Key_Down:xspeed+=0.2;updateGL();break;case Qt::Key_Right:yspeed+=0.2;updateGL();break;case Qt::Key_Left:yspeed-=0.2;updateGL();break;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(3,&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_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);glBindTexture(GL_TEXTURE_2D,texture[1]);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_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);glBindTexture(GL_TEXTURE_2D,texture[2]);//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_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);gluBuild2DMipmaps(GL_TEXTURE_2D,GL_RGB,tex.width(),tex.height(),GL_RGBA,GL_UNSIGNED_BYTE,tex.bits());}