opengl嵌入到qt中

OpenGL嵌入到Qt中

分类： Qt 2010-05-12 09:16  211人阅读  评论(0)  收藏  举报

将OpenGL嵌入到Qt中的流程如下：

 

nehewidget.h

 

 #ifndef NEHEWIDGET_H
 #define NEHEWIDGET_H
 #include <Qt/qgl.h>

 class NeHeWidget : public QGLWidget
 {
     Q_OBJECT

 public:

   NeHeWidget( QWidget* parent = 0, const char* name = 0, bool fs = false );
   ~NeHeWidget();

 protected:

   void initializeGL();
   void paintGL();
   void resizeGL( int width, int height );

   void keyPressEvent( QKeyEvent *e );
   void loadGLTextures();

 protected:

   bool fullscreen;
   GLfloat xRot, yRot, zRot;
   GLfloat zoom;
   GLfloat xSpeed, ySpeed;
   GLuint texture[3];
   GLuint filter;

   bool light;
 };

 #endif // NEHEWIDGET_H

 

nehewidget.cpp

 

 #include <QtGui/QApplication>
 #include <QtGui/QMainWindow>
 #include <QtGui/QWidget>
 #include <QtGui/QImage.h>
 #include <QtGui/qevent.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 };

 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;

   fullscreen = fs;
   setGeometry( 100, 100, 640, 480 );
   //setCaption("NeHe's Texture, Lighting & Keyboard Tutorial");

   if ( fullscreen )
     showFullScreen();
 }

 NeHeWidget::~NeHeWidget()
 {
 }

 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::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 );

   glLightfv( GL_LIGHT1, GL_AMBIENT, lightAmbient );
   glLightfv( GL_LIGHT1, GL_DIFFUSE, lightDiffuse );
   glLightfv( GL_LIGHT1, GL_POSITION, lightPosition );

   glEnable( GL_LIGHT1 );
 }

 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_PageUp:
     zoom -= 0.2;
     updateGL();
     break;
   case Qt::Key_PageDown:
     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( 100, 100, 640, 480 );
     }
     update();
     break;
   case Qt::Key_Escape:
     close();
   }
 }

 void NeHeWidget::loadGLTextures()
 {
   QImage tex, buf;
   if ( !buf.load( ":/MyPicture/Crate.bmp" ) )
   {
     qWarning( "Could not read image file, using single-color instead." );
  QImage dummy( 128, 128, /*32*/QImage::Format_Indexed8);
  dummy.fill( Qt::green );
     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 );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST );
   gluBuild2DMipmaps( GL_TEXTURE_2D, GL_RGB, tex.width(), tex.height(),
       GL_RGBA, GL_UNSIGNED_BYTE, tex.bits() );
 }

 

 

main.cpp

 

 

 #include <QtGui/QApplication>
 #include <QtGui/QMainWindow>
 #include <QtGui/QWidget>
 #include <QtGui/QMessageBox>
 #include <Qt/qgl.h>

 #include "nehewidget.h"

 int main( int argc, char **argv )
 {
   bool fs = false;

   QApplication a(argc,argv);

   switch( QMessageBox::information( 0,
       "Start FullScreen?",
       "Would You Like To Run In Fullscreen Mode?",
       QMessageBox::Yes,
       QMessageBox::No | QMessageBox::Default ) )
   {
   case QMessageBox::Yes:
     fs = true;
     break;
   case QMessageBox::No:
     fs = false;
     break;
   }

   NeHeWidget w( 0, 0, fs );
   //a.setMainWidget( &w );//QT4.X以上版本不需要了
   //a.setActiveWindow( &w );
   w.show();

   return a.exec();
 }

 

 Qt_2.pro  这是配置文件

 

 

 INCLUDEPLAT += E:/Qt/ogl/gl
 LIBS += -L/E:/Qt/ogl /
     -lglu32
 LIBS += -L/E:/Qt/ogl /
     -lopengl32
 QT += opengl
 HEADERS += nehewidget.h
 SOURCES += nehewidget.cpp /
     main.cpp
 RESOURCES += nehe.qrc

 

 

nehe.qrc   这是资源文件

 

 <RCC>
   <qresource prefix="MyPicture" >
      <file>Crate.bmp</file>
   </qresource>
 </RCC>

Crate.bmp是个图片

 

在QtCreator中创建一个Qt空工程，

将以上几个文件加入到工程中。

就可以编译运行了。

 

环境框架：

 

 

 

 

 

我的实现结果：