Re: Vblanks, CRTCs and GLX, oh my!

[Ian R. <id...@us...>]

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Michel Dänzer wrote:
> On Tue, 2007-09-25 at 13:32 -0700, Jesse Barnes wrote:
>> It seems that drivers that set their MSC routines to NULL will return 
>> GL_BAD_CONTEXT from calls like glXWaitVideoSyncSGI(), and if e.g. 
>> drmWaitVBlank() failed clients would get the same result, so 
>> compatibility would be preserved...
> 
> Isn't the presence or absence of the driver hooks used to decide whether
> or not to advertise the GLX extension(s) though?

Not currently.  The driver has to set the callback and tell libGL to
enable the extension.
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