kc3-lang/angle

2020-04-24T13:13:18

Vulkan: Defer framebuffer clears. This works by storing the deferred clears in the ImageHelper's staging buffers. We apply the deferred clears onto the RenderPass right before we begin to draw. Storing the clears in the ImageHelper solves problems where we clear GL Textures in a Framebuffer and then unbind the Textures and sample from them. Or do other commands like CopyTexImage. Note that because the staging buffer clears only handle full-image clears we need to immediately apply some scissored clears where before we would use the RP. This should be a pretty rare occurrence and it is possible to optimize that in the future. Reduces the RenderPass count in the Manhattan "frame 10" trace from max 22 to max 20. May improve perf slightly on Android or may have effects too small to measure. Should not regress performance. Bug: angleproject:4517 Change-Id: I02150d531022afb903f1058f070937ec6337bd88 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2142711 Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>