[PATCH] present: Send GLX_BufferSwapComplete events from present extension

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> This allows GL to support the GLX_INTEL_swap_event extension
>
> Signed-off-by: Keith Packard <keithp at keithp.com>

There's a minor behavior change that the event now gets sent to the
drawable owner rather than the caller of DRI2SwapBuffers.

I don't expect it to matter in practice (I expect that the
swap-requesting client using this GLX extension is also the
drawable-creating one), and either choice seems wrong compared to "send
the event to everyone listening for the event on this drawable".  That
would be a separate change, anyway.

Reviewed-by: Eric Anholt <eric at anholt.net>
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