We'll start by creating our buffers. We'll use a framebuffer object with a depth attachment and two color attachments. The ambient component can be stored in a renderbuffer (as opposed to a texture) because we'll blit (a fast copy) it over to the default framebuffer rather than reading from it as a texture. The diffuse + specular component will be stored in a texture.
Create the ambient buffer (ambBuf), a depth buffer (depthBuf), and a texture (diffSpecTex), then set up the FBO:
glGenFramebuffers(1, &colorDepthFBO); glBindFramebuffer(GL_FRAMEBUFFER, colorDepthFBO); glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuf); glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, ...
