OpenGL FrameBuffer Object 201
by Rob 'phantom' Jones

Contents   Introduction   Selecting The Destination   The first example   Multiple Render Targets   The Draw Buffers Extension   MRT with FBO and GLSL   The Second Example   Final Thoughts   Source code   Printable version   Discuss this article The Series   OpenGL Frame Buffer Object 101   OpenGL Frame Buffer Object 201

Multiple Render Targets

Now we know how to attach multiple textures to an FBO, however we are still only drawing to one texture at a time by switching the draw target and, as helpful as that might be, at the start of the article it was mentioned that we would be covering how to render to multiple textures at the same time.

Well, it turns out that once you understand how to attach multiple textures at once the rest is pretty simple and all you need comes from the Draw Buffers extension and the OpenGL Shading Language (GLSL), both of which are core features of OpenGL 2.0.

The Draw Buffers Extension