tree d0a0cc017dbfa1278cf83668476cba83a51b8813
parent 275a95c1dc64638ef4eddc8df8eab66efa516bea
author Bryan Bernhart <bryan.bernhart@intel.com> 1589844331 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1589844331 +0000

D3D12: De-duplicate sampler heap allocations.

Allows bindgroups that use the same samplers to share
a descriptor heap allocation. This is particularly important
for sampler heaps which incur expensive pipeline flushes
due to the smaller size requiring more frequent switches.

The device dolls out entries to a sampler heap allocation cache.
When the BindGroup is created, it does a lookup and refs the
allocation. This ensures the cache does not grow unbounded
or needlessly store unused entires.

This change is a follow-up of de-coupling heaps.

BUG=dawn:155

Change-Id: I3ab6f1bdb13a40905cb990cd7a2139e73da30303
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/20783
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>