Commit 5e5b7537d091c4d14785209a045c79971478c0d1
2020-08-10T21:02:50
Vulkan: Optimize resource tracking in CommandBufferHelper. Introduces a FastUnorderedMap class that uses FastVector. This type uses static storage for up to a small fixed number of elements and uses dynamic storage for anything larger. Local testing shows this almost fully solves the regression from using unordered_map. It's still slightly slower than using no tracking (<5%). Very degenerate cases which track dozens or more buffers will still have significant overhead. For almost all applications that use only a few buffers per RenderPass this will be very fast. Test: angle_perftests, *vulkan_null_index_buffer_changed_ushort Bug: angleproject:4950 Bug: angleproject:4429 Change-Id: I39edeaaa159124167f1ea23ad2e6eac5e9220d0b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2348108 Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>