[英]Rotate texture openGL c++
当我从openCV图像制作纹理时,总是将其旋转180度,为什么? 我的代码绑定了纹理并将其显示在屏幕上。 如果采用代码规范,建议我如何正确旋转纹理,我无法理解。
glBindTexture( GL_TEXTURE_2D, slice.texture);
glLoadIdentity();
glEnable(GL_TEXTURE_2D); //enable 2D texturing
glBegin (GL_QUADS);
float nullX = slObj->rect.x/400.0;
float nullY = slObj->rect.y/300.0;
float sliceWidth = slObj->rect.width/400.0;
float sliceHeight = slObj->rect.height/300.0;
//with our vertices we have to assign a texcoord
//so that our texture has some points to draw to
glTexCoord2d(0.0,0.0); glVertex2f(nullX, nullY);
glTexCoord2d(1.0,0.0); glVertex2f(nullX + sliceWidth, nullY);
glTexCoord2d(1.0,1.0); glVertex2f(nullX + sliceWidth, nullY + sliceHeight);
glTexCoord2d(0.0,1.0); glVertex2f(nullX, nullY + sliceHeight);
glEnd();
glFlush();
更新:
// initialize
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
glutInitWindowSize(screenWidth, screenHeight);
glClearColor(0.3,0.3,0.3,0.0);
glMatrixMode(GL_PROJECTION);
glOrtho(-400.0 ,400.0 ,-300.0 ,300.0 ,0 ,1.0);
因为我使用openCV加载和切片图像,所以我只是翻转图像。
IplImage *source = cvLoadImage("space.png",1);
if(source == NULL) source = cvLoadImage("C://space.png",1);
cvFlip(source, source, 0);
感谢你的帮助!
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