commit c3c06a13e69b90d4cc1d543853504072d363ae8b
author wasim.abbas <wasim.abbas@arm.com> Thu May 14 08:24:52 2015 -0700
committer Commit bot <commit-bot@chromium.org> Thu May 14 08:24:52 2015 -0700
tree 40f46a5515eeb30b15225046b7584334ca75ebeb
parent 7ae68a8f8d5b26cb945dbf8147eb343a59c22b40

Defer glClear to just before draw call

Remove some DO_DEFERRED_CLEAR call to avoid call glClear separately, like this:
glBindFramebuffer(1)
glClear
glBindFramebuffer(2)
glClear
glBindFramebuffer(1)
glDrawXXX
glBindFramebuffer(2)
glDrawXXX

These call sequences may need read and write memory back and forth.

If we call DO_DEFERRED_CLEAR just before draw call, we can bind, clear and draw in one go.
e.g.
glBindFramebuffer(1)
glClear
glDrawXXX
glBindFramebuffer(2)
glClear
glDrawXXX

BUG=skia:

Review URL: https://codereview.chromium.org/1113003005