This implies that the WebGL implementation maintains a copy of allOn Tue, Mar 6, 2012 at 4:01 PM, Florian Bösch <firstname.lastname@example.org> wrote:
> On Wed, Mar 7, 2012 at 12:57 AM, John Bauman <email@example.com> 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.
vertex data that's been uploaded. As I mentioned above I think this is
impractical on mobile devices.