Olivier Fourdan 34b5a07d58 renderer-native: Separate offscreen and shadowfb
Create the intermediate shadow framebuffer for use exclusively when a
shadowfb is required.

Keep the previous offscreen framebuffer is as an intermediate
framebuffer for transformations only.

This way, we can apply transformations between in-memory framebuffers
prior to blit the result to screen, and achieve acceptable performance
even with software rendering on discrete GPU.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/917

(cherry picked from commit 551641c74822ca2e3c685e49603836ebf5397df2)
2019-11-04 11:08:02 +01:00
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