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Campbell Barton 48da8c4040 Fix T98462: Save Screenshot (glReadPixels) fails under Wayland ...

Use an off-screen buffer for the screen-shot operator.

Reading from the front-buffer immediately after calling swap-buffers
failed for GHOST/Wayland in some cases.
While EGL can request to preserve the front-buffer while drawing,
this isn't always supported. So workaround the problem by avoiding
use of the front-buffer entirely.

2022-08-17 12:58:17 +10:00

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