We have constructed a framework in OpenGL and can render primitives and textures. We have full postscript output capability for anything constructed from primitives but have run into trouble when trying to extract texture information.
To try to understand this better, I made a quad and mapped a texture to it and then captured the GL_FEEDBACK buffer. The feedback buffer was only 46 floats long and was simply the two triangles (polygons) that made up the quad. There was no texture information.
If I can get the pixel per pixel color information of the screen rendering of the texture I can write the postscript output. I just need the color in each pixel and the coords of the corners.
Am I missing something, is the texture data stored somewhere else.
Thanks in advance,