Re: OpenGL states and performances

zyend <karim.atiki@[EMAIL PROTECTED]
> writes:

> Hi fungus,
> 
> > Yes, any simple test which eliminates an OpenGL function
> > is good.
> Ok, I'm using the following function:
> 
> glGetIntegerv(GL_TEXTURE_BINDING_2D, &currentID);
> 
> At first, I was using a static variable to store the current texID.
> But in my tile and sprite editor, I have different OpenGL context and
> therefore I experienced some issues with
> my static variable.
> But in my game engine, I expect to have only one OpenGL context and
> then maybe I could re-use this mechanism instead of glGetIntegerv().
> Is glGetIntegerv() such a pain to call ?

Yes, it forces the command pipeline to be flushed/synchronized/whatever
and probably waits until all commands up to your glGetIntergerv are done.

So you are stalling your CPU until the GPU is done.

-- 
folays