tree aa37e6648681d9006caf96ea6bd08c8c08f3a76e
parent 3159b2e52e0592aabc0cd6386a2536c5a74eec71
author Jamie Madill <jmadill@chromium.org> 1547663235 -0500
committer Commit Bot <commit-bot@chromium.org> 1547781700 +0000

Vulkan: Store reference to context command buffer.

This frees us from checking the FB every draw. Slightly reduces time
spent in all draw methods. Improvement seen on the draw call overhead
tests. Scores went from 28.17 ns/draw to 26.76 ns/draw on my machine.

In a future improvement we could make this command buffer a dirty bit.
Currently it's a bit slower to call a handler function due to the
dispatch table. Likely we could optimize this by reverting back to a
dirty bit switch and inlining the handler functions. That is left for
future work.

Vulkan is happy enough to run multiple RenderPasses and bind different
Pipelines in the same command buffer. But ANGLE defers RenderPass init
until we submit our work. Thus we can only support one RenderPass per
secondary buffer.

Test: angle_perftests DrawCall*/vulkan_null
Bug: angleproject:3014
Change-Id: I89fd0d9e0822400a5c5a16acb5a9c400a0e71ab5
Reviewed-on: https://chromium-review.googlesource.com/c/1393905
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>