Selecting Color Buffers for Writing and Reading
The results of a drawing or reading operation can go into or come from any of the color buffers:
• front, back, front-left, back-left, front-right, or back-right for the default framebuffer, or
• front, or any renderbuffer attachment for a user-defined framebuffer object.
You can choose an individual buffer to be the drawing or reading target. For drawing, you can also set the target to draw into more than one buffer at the same time. You use glDrawBuffer(), or glDrawBuffers() to select the buffers to be written and glReadBuffer() to select the buffer as the source for glReadPixels(), glCopyTexImage*(), and glCopyTexSubImage*().
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