tree c94ed241a4e3ba37e3e411e6b6d605915365b461
parent af875527dd30df822016ff90307de938195176c3
author Geoff Lang <geofflang@chromium.org> 1410968537 -0400
committer Geoff Lang <geofflang@chromium.org> 1411064177 +0000

Don't skip draw calls on zero-sized viewports.

If transform feedback is active, primitives still need to be rendered even
if no pixels are written to the framebuffer.

Instead of checking for active transform feedback, simply remove the draw
call skipping optimization since it is most likely an application mistake to
draw with a zero sized viewport and we shouldn't optimize for this case.

This change doesn't affect the clear calls because the viewport is set to the
framebuffer size which is non-zero.

BUG=angle:743

Change-Id: I04af9d6de5aad3040e3c6b3c24990e107e21ad36
Reviewed-on: https://chromium-review.googlesource.com/218508
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>