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Re: [Public WebGL] ANGLE_instanced_arrays extension proposal



On Tue, Mar 6, 2012 at 4:01 PM, Florian Bösch <pyalot@gmail.com> wrote:
> 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.

This implies that the WebGL implementation maintains a copy of all
vertex data that's been uploaded. As I mentioned above I think this is
impractical on mobile devices.

-Ken

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