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POOpenGL texture inverted
 

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    <p>I'm trying to map the input from my webcam to a plane in OpenGL. I'm using OpenCV to get the images from the webcam. </p> <p>The problem I have is that the texture is vertically inverted, if my texture is "v", the current result is "^". </p> <p>I want to fit the image taken from the webcam to my plane (2x2). Its lower left corner is -1, -1 and the upper right corner is 1,1. </p> <p>The code is: </p> <pre><code>const int VIEWPORT_WIDTH = 640; const int VIEWPORT_HEIGHT = 480; const int KEY_ESCAPE = 27; CvCapture* g_Capture; IplImage* image; GLint g_hWindow; GLvoid InitGL(); GLvoid OnDisplay(); GLvoid OnReshape(GLint w, GLint h); GLvoid OnKeyPress (unsigned char key, GLint x, GLint y); int main(int argc, char* argv[]) { glutInit(&amp;argc, argv); glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH); glutInitWindowPosition(100, 100); glutInitWindowSize(VIEWPORT_WIDTH, VIEWPORT_HEIGHT); g_hWindow = glutCreateWindow("Image"); image = cvLoadImage("average.jpg", 1); gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, image-&gt;width, image-&gt;height, GL_RGB, GL_UNSIGNED_BYTE, image-&gt;imageData); InitGL(); glutMainLoop(); return 0; } GLvoid InitGL() { glClearColor (0.0, 0.0, 0.0, 0.0); glutDisplayFunc(OnDisplay); glutReshapeFunc(OnReshape); glutKeyboardFunc(OnKeyPress); } GLvoid OnDisplay(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_TEXTURE_2D); glPushMatrix(); glTranslatef(0.0f, 0.0f, -2.5f); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f, 1.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f, 1.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); glEnd(); glPopMatrix(); glutSwapBuffers(); } GLvoid OnReshape(GLint width, GLint height) { if (height==0) height=1; glMatrixMode(GL_PROJECTION); glLoadIdentity(); glViewport(0, 0, width, height); gluPerspective(45.0f,(GLfloat)width/(GLfloat)height, 1.0f, 10.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt( 0.0, 0.0, 0.0, 0.0, 0.0, -6.0, 0.0f, 1.0f, 0.0f); } GLvoid OnKeyPress(unsigned char key, int x, int y) { switch (key) { case KEY_ESCAPE: cvReleaseImage(&amp;image); glutDestroyWindow(g_hWindow); exit(0); break; } glutPostRedisplay(); } </code></pre> <p>BTW. In this code I'm loading an image instead of getting from the webcam.</p> <p>Any suggestion?</p>
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    1. COSwap the last parameters of your glTexCoord2f-calls (0.0f->1.0f and vice versa)
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