Framebuffer Texture behavior in OpenGL/OpenGLES?

The problem is not so much the possibility of feedback loops (technically this would not result in a loop, but an undefined order in which pixels are read/written causing an undefineable behaviour), but the limitations of the access modes GPUs implement: A buffer can either only be read from or written to at any given time (gather vs. scatter access). And the GPU always sees a buffer as a whole. This is the main reason for that limitation.

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