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Hash : ea580484
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Date : 2021-10-05T13:40:01
Vulkan: Add feature flag to prefer CPU copy instead of staged update For ARM GPU, use GPU to do buffer to buffer copy has performance penalty due to potential bubble in the vertex pipeline. This CL adds a feature flag preferCPUForBufferDataSubData so that we can enable this behavior for ARM GPUs. This CL also tracks if GPU has referenced this BufferVk's storage since it got new storage. Due to sub-allocation, we may get a new sub-range of the same BufferHelper object when allocating new storage. But we currently do not have a way to track GPU progress of the sub-range of a buffer. So we will end up using BufferHelper's queueSerial to decide if it is still GPU busy or not. This CL adds mHasBeenReferencedByGPU boolean variable that will set to false when we got a new allocation and set to true as soon as buffer is been referenced by any GPU command. We use this to avoid checking queueSerial if it never been referenced by GPU. This is a temporary workaround for the bug, the full fix is tracked by https://issuetracker.google.com/201826021 Bug: b/200067929 Change-Id: I231fb0a678b0165a2ce1775d0aa4dbe7512fb4a8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3183398 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>
