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Hash : e50351cb
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Date : 2022-06-10T22:28:58
Vulkan: Don't close render pass on framebuffer fetch For applications that use framebuffer fetch in the same RP as non-fetch programs, we can save some extra RenderPasses by always creating our RP objects with input attachments enabled. This works almost identically except for needing to use the images in a "GENERAL" layout instead of "COLOR_ATTACHMENT_OPTIMAL". According to partners it is possible to achieve performance parity even with GENERAL layout. To remove any potential negative impacts of using the GENERAL layout, the context enters this always-framebuffer-fetch mode only and as soon as a framebuffer fetch program is created. Applications that don't use framebuffer fetch are thus unaffected. This eliminates 20 render passes in the Genshin Impact trace (out of about 58). On a Pixel 6 the resulting benchmark score speeds up by ~25%. For Real Racing 3, the speed up is ~30%. Based on change by jmadill@chromium.org Bug: angleproject:7375 Change-Id: Ib6c73e95d06229f8545d502b388ee2a55a582323 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3697308 Reviewed-by: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
