I have a texture in RGBA mode, but instead of color values, I''ve got 32 bit directions on it. I need to draw it on the frame buffer exactly as is, without any filter nor clamping. I use glReadPixels to read the frame buffer but when I do it, I don''t obtain the same pixels (32 bit directions), and that''s very bad, I think I''ve disabled everything that modifies the pixels: glDisable(GL_LIGHTING); glShadeModel(GL_FLAT); glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_DECAL); glTexImage2D(...,GL_NEAREST); // MIN and MAG filters But I''ve read that glReadPixels does some pixel operations before storing the data to the client memory. Is there any way to prevent OpenGL to do such operations?

The textures are in 32 bpp (RGBA) 8 bit per component.

I''m sure my application is running at 32 bpp. I''m using a PBuffer to render the scene, but I''ve configured it also at 32 bpp. Anybody knows if it''s possible to store 32 bit directions in a texture using OpenGL, drawing it, and then obtain the actual values?