Qt+OpenGL在立方体表面显示视频流

#include "qtshowvideo.h" #include <QtGui/QApplication> #include <QtGui/QMainWindow> #include <QtGui/QWidget> #include <QtGui/QImage.h> #include <QtGui/qevent.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 }; QImage * IplImageToQImageRGB(const IplImage * iplImage) { int width = iplImage->width; int widthStep = iplImage->widthStep; int height = iplImage->height; uchar *qImageBuffer = (uchar *) malloc(width*height*4*sizeof(uchar)); uchar *QImagePtr = qImageBuffer; const uchar *iplImagePtr = (const uchar *) iplImage->imageData; for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { QImagePtr[0] = iplImagePtr[0]; QImagePtr[1] = iplImagePtr[1]; QImagePtr[2] = iplImagePtr[2]; QImagePtr[3] = 0; QImagePtr += 4; iplImagePtr += 3; } iplImagePtr += widthStep-3*width; } QImage *qImage = new QImage(qImageBuffer, width, height, QImage::Format_RGB32); return qImage; } QtShowVideo::QtShowVideo( 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 ); if ( fullscreen ) showFullScreen(); } QtShowVideo::~QtShowVideo() { cvReleaseCapture(&pCapture); } void QtShowVideo::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] ); glBindTexture( GL_TEXTURE_2D, texName ); QImage tex, *buf; IplImage* pFrame = cvQueryFrame(pCapture); if (!pFrame) { return; } buf = IplImageToQImageRGB(pFrame); tex = convertToGLFormat(*buf); glTexImage2D( GL_TEXTURE_2D, 0, 3, tex.width(), tex.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, tex.bits() ); 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 QtShowVideo::initializeGL() { pCapture = cvCreateCameraCapture(-1); 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 ); //新建一个QTimer对象 timer = new QTimer(); //设置定时器每个多少毫秒发送一个timeout()信号 timer->setInterval(30); //启动定时器 timer->start(); //信号和槽 connect(timer, SIGNAL(timeout()), this, SLOT(onTimerOut())); } void QtShowVideo::onTimerOut() { updateGL(); } void QtShowVideo::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 QtShowVideo::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; xRot -= 1; updateGL(); break; case Qt::Key_Down: //xSpeed += 0.01; xRot += 1; updateGL(); break; case Qt::Key_Right: //ySpeed += 0.01; yRot += 1; updateGL(); break; case Qt::Key_Left: //ySpeed -= 0.01; yRot -= 1; 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(); default: updateGL(); } } void QtShowVideo::loadGLTextures() { QImage tex, *buf; /*qWarning( "Could not read image file, using single-color instead." ); if ( !buf.load( "Nash.jpg" ) ) //if ( !buf.load( "bird.bmp" ) ) { qWarning( "Could not read image file, using single-color instead." ); QImage dummy( 512, 512, / *32* /QImage::Format_Indexed8); dummy.fill( Qt::green ); buf = dummy; } */ IplImage* srcImg = cvLoadImage("Nash.jpg"); buf = IplImageToQImageRGB(srcImg); tex = QGLWidget::convertToGLFormat( *buf ); glGenTextures(1,&texName); glBindTexture( GL_TEXTURE_2D, texName ); 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() ); 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_TEXTUR