tree d885e28a4f54375418d97c76ce668ffbc17cf9c0
parent 8580d51cd8cb733321978966621056fa38b7be8c
author Brian Salomon <bsalomon@google.com> 1508245864 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1508261412 +0000

Make GPU backend triangulate rects such that they are rendered as tri strips rather than tri fans.

Right now when we turn rects into quads we use a vertex order compatible with a tri fan rather than a tri strip.

I wanted it to be the case that the same code could be used to generate a non-indexed mesh for a single rect or indexed using the quad index buffer when batching. Triangle fanning is not available in all APIS (e.g. is emulated in ANGLE and not supported in Metal) so it seems better to use a triangle strip over a fan in the single rect case.


Change-Id: I31eebd794e7328f4b39e3ec3377bf2ec556360ca
Reviewed-on: https://skia-review.googlesource.com/60081
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>