I think in theory anyone (2D, 3D, CPU) can write to any BD it as long
as it is selected as the destination of that operation. you can even
set one BD as a source and another as a destination I think. Perhaps
Tim can clarify this.
I would think you would have to be able to do that. That way you could render to an offscreen buffer in either tiled or lineary mode (i.e., pbuffer) and copy to a linear framebuffer, tiled texture, etc. I suspect that may be what the "extra" BD is for.
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