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Re: How to best get smooth scrolling in X?

Mads Bondo Dydensborg wrote:
> On Wed, 27 Nov 2002, Stephen J Baker wrote:
>>On Wed, 27 Nov 2002, Mads Bondo Dydensborg wrote:
>>>Yes, this seems in line with most other stuff I have read. It is the same
>>>thing for stuff like DGA, right?
>>>DGA & SDL gives true doublebuffering, but only in fullscreen mode it
>>>seems. Sigh.
>>OpenGL hardware typically provides for two modes:
> Thanks. Would it be your impression that the OpenGL drivers typically wait 
> for the vertial retrace before swapping?

For the few I've played with - under Linux they generally require
you to set up a shell variable to select between 'swap immediately'
and 'swap on next vertical retrace' modes.

On nVidia hardware (using their closed-source drivers), you say:

   export __GL_SYNC_TO_VBLANK=1

...to enable the vblank sync.

I recall Mesa has something similar - but I don't remember what it is
or what cards it works with.

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