Commit 9158436e1e73d4c440329c4c289e5b4c14b9a3f0
2021-07-31T18:26:16
Vulkan: glMapBuffer(): Create new buffer (Buffer Ghosting) When glMapBuffer() is called, if the buffer is in use but not being written to by the GPU: 1.) Create a new buffer. 2.) Copy the contents of the old buffer into the new buffer. 3.) Map the new buffer and return the pointer. Creating a new buffer prevents ending the renderpass and flushing the commands to allow the in-use buffer to be mapped. This change increases Idle Heroes performance from 40FPS to 125FPS. Bug: angleproject:5971 Test: VulkanPerformanceCounterTest.MappingGpuReadOnlyBufferGhostsBuffer Test: BufferDataTest.MapWriteArrayBufferDataDrawQuad Test: BufferDataTest.MapWriteArrayBufferDataDrawArrays Change-Id: I1d433d179f9f5110a948f191c5aedda5397acac8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3065799 Commit-Queue: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com>