Commit ca70b6367d657f53ff0e6509e317d25e6998589e
2021-09-09T16:34:34
Vulkan: Reformat staged buffer data using CPU When a R4G4B4A4 texture is attached to FBO, we dynamically choose a new format to fallback to R8G8B8A8 on some GPU that can't render to R4G4B4A4. During this format switch, if we already have a staged buffer update with old format, we must reformat the data to new format. Right now this is done by initImage and flush out staged update and read back and restage. This is very inefficient. This CL adds a new code path that just uses CPU to convert the staged data from old format to new format. Bug: b/198788068 Change-Id: I9b763dafdc9431d4fbbc26169c156b09ac13c815 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3153055 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>