Buffer Damage

[Vlad Zahorodnii]

On 1/4/21 2:48 PM, Simon Ser wrote:
> OK, this still doesn't explain which/how/why existing clients would
> benefit from the optimization, and how much performance will really
> improve in practice.
> 

This will benefit only the compositor.

If buffer data is being uploaded to a texture asynchronously, you can't
use the texture since you are most likely going to see junk. Every 
buffer must be attached to a separate texture.

On the other hand, the surface damage cannot be used to decide what 
parts of the texture must be updated because it doesn't include the area 
of the buffer that got repaired. Either the client has to indicate the 
buffer damage or the compositor has to determine it by itself, e.g. by 
accumulating surface damages.

Hope this clarifies the things.