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162 Capítulo D. Código fuente833 gboolean createAdquisitionVideo(GtkWidget *widget){834835 GdkGLContext *glcontext;836 GdkGLDrawable *gldrawable;837838 if (img != NULL) {839 glcontext = gtk_widget_get_gl_context (widget);840 gldrawable = gtk_widget_get_gl_drawable (widget);841842843 if( !imageAdquisition) {844 imageAdquisition = cvCreateImage( cvSize(img->width,845 img->height),846 IPL_DEPTH_8U, img->nChannels );847 }848849 cvResize(img, imageAdquisition, CV_INTER_LINEAR );850 cvFlip( imageAdquisition, imageAdquisition, 0 );851852 if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext)){853 g_print ("*** ERROR: Problem in dibujar\n");854 }855856 glClear( GL_COLOR_BUFFER_BIT );857 glLoadIdentity();858 glTranslatef(0.0f, 0.0f,-1.0f);859860 GLenum format = IsBGR(imageAdquisition->channelSeq)861 ? GL_BGR_EXT : GL_RGBA;862863 if (!init) {864 glGenTextures(1, &imageID1);865 glBindTexture(GL_TEXTURE_2D, imageID1);866 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);867 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);868 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);869 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageAdquisition->width,870 imageAdquisition->height, 0,871 format, GL_UNSIGNED_BYTE, imageAdquisition->imageData);872 init= 1; // init is over873 }874 else {875 glBindTexture(GL_TEXTURE_2D, imageID1);876 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, imageAdquisition->width,877 imageAdquisition->height, format, GL_UNSIGNED_BYTE,878 imageAdquisition->imageData);879 }880 glPushMatrix();881 glEnable(GL_TEXTURE_2D);882883 glBegin(GL_QUADS);{884 glTexCoord2f(0, 0); glVertex3f(-1, -1, 0);885 glTexCoord2f(0, 1); glVertex3f(-1, 1, 0);886 glTexCoord2f(1, 1); glVertex3f(1, 1, 0);887 glTexCoord2f(1, 0); glVertex3f(1, -1, 0);888889 }glEnd();890 glPopMatrix();891892 if (gdk_gl_drawable_is_double_buffered (gldrawable)){