Commit c7b0cf2a28f7a433368442fb9350d083a6feae96
2017-11-22T16:34:09
D3D11: Remove "fast path" check in DrawElements. This was a bit of an anti-pattern. Many draw calls were being handled in the "slow" path, so the repeated checks were slowing the draw calls down more than the fast path was speeding things up. The new code tries to do all the checking for index ranges and restart index once only, and lazily when possible. The 'start' vertex is a bit of a special case - we known when the primitive restart index is not enabled, this will be always the same as the 'base' vertex (zero if the base vertex is not enabled - only currently available through draw indirect commands). In future work we can look at implementing a lazy evaluation for draw indirect commands so we don't need to do a check there either. Reduces overhead in the D3D11 indexed rendering perf test such that it leads to an increased score of about 5%. BUG=angleproject:2229 Change-Id: I6330f30b66d1810624d03f4e7a012bf2391a3bf3 Reviewed-on: https://chromium-review.googlesource.com/764677 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>