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Re: [Public WebGL] ANGLE_instanced_arrays extension proposal

On Wed, Mar 7, 2012 at 12:57 AM, John Bauman <jbauman@chromium.org> wrote:
If you want you could do that only on the first instanced draw from a buffer, and keep a shadow copy afterwards, but it might be difficult to make that perform well.
No nead for readbacks, if you intercept bufferData calls and create a shadow copy then which you manage, you can do the right thing once before draw.