[PATCH xserver 2/2] glamor: Always purge the FBO cache in BlockHandler

[Eric Anholt]

Michel Dänzer <michel at daenzer.net> writes:

> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Or if the cache watermark is reached, whichever comes earlier.
>
> This slightly simplifies the FBO cache management, and prevents it from
> potentially holding entries for a long time, while preserving the main
> benefit of the cache for bursts of drawing operations.
>
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

For re-adding an FBO cache, I would need to see that we have
APPLE_object_purgeable used so that the FBO cache can be evicted, and
use proper timers to garbage collect the FBOs instead of waiting for N
blockhandlers, which is only vaguely related to wall time.
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