Surface locks (was Re: Re: When will there be blitting support when using OpenGL)

vining at wrote:

Unfortunately, not true. We have no way of guaranteeing that an
SDL_Surface has not changed since the last upload (since we can
access the surface’s pixels directly without going through another
API), therefore we would need to constantly re-upload. A cruel world.
As for necessity, you’re right, but if you wanted to do something
like rewrite SDL’s video aspect to do 2D blits on top of OpenGL you
would have to. Sucky.

Actually, I already suggested to Sam that forcing people to use a
Lock/Unlock kind of operation would be a nice idea and would enable some
drivers to accelerate cases like these (for exemple, in raw Xlib,
Pixmaps can be faster than shared memory with XF86 4.0, and just as fast
with pre-4.0).

… not a bad idea (a pain in the ass for users, but not a bad idea…) however
I doubt you could do this without breaking applications which used an older
SDL. Sam?