tree c0fa18c650fec7c91401e30b4b5cbd8b60089125
parent dbd74a098ec3f8f05e396d03dff483f1a7104f86
author Jamie Madill <jmadill@chromium.org> 1408989496 -0400
committer Jamie Madill <jmadill@chromium.org> 1408992706 +0000

Optimize dynamic buffers.

In D3D11, we would previously always use a staging buffer to proxy
data to the GPU. This change allows users which specify DYNAMIC_DRAW
to skip the staging buffer as long as they only write to index or
vertex buffers.

This improves performance on all tested GPU vendors, but in D3D11
on AMD and Intel our SubData calls are still significantly slower
than in D3D9.

BUG=angle:705
BUG=365078

Change-Id: I4f83164176d67ff00119bdd0a6a80d7c84fd0f03
Reviewed-on: https://chromium-review.googlesource.com/213813
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>