Improving DirectDraw OpenGL renderer for SoC?

Scott Ritchie scott at
Wed Mar 21 16:15:34 CDT 2007

On Wed, 2007-03-21 at 20:32 +0100, Stefan Dösinger wrote:
> The other issue is render target locking. This is essentially something that 
> is not well supported by OpenGL. There are 2 extensions which can help to 
> improve that, one is the pixel buffer objects extension, the other one is a 
> nvidia only extension which does exactly the same as 
> IDirectDrawSurface7::Lock. If neither of those extensions is available, or if 
> pbos turn out to be slow too, we can only play tricks like watching the 
> application's behavior and predict the area it will modify. I have started 
> toying with that, the most important fragment is this: 

If it's the most efficient way to make it work, I see nothing wrong with
using an nvidia-only extension and then letting it be known we'd like
that extension as part of the OpenGL specification.

We'd likely want to catalog the various vendor-specific extensions we
use somewhere, though.

Scott Ritchie

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