Thanks! One question though: won't the readpixels call (with bound
VBO) start an asynchronous readback to main memory - consuming
bandwidth?
Or does this not happen with VBOs?
It depends what and where is the source of the readback, but generally
no it won't since a VBO or a PBO represent memory on the GPU. I
couldn't find a specific reference to this in ARB_vertex_buffer_object
however, so you should make sure. I would be very surprised if a
readback with any bound buffer object would incur staging through main
memory.
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