tree 2e670c818c33bf2ead5342dad73b48e000d2e94c
parent b2e2f2470693e78baed20617f989d9a166864ed4
author Romain Guy <romainguy@google.com> 1350597902 -0700
committer Romain Guy <romainguy@google.com> 1350597902 -0700

Defer layer rendering to avoid stalls
Bug #7326824

When a layer is taken out of the cache and initialized it gets cleared
to prepare it for future rendering. This triggers the following sequence
of operations:

glBindFramebuffer(layer.fbo)
attach texture storage to FBO
glClear()
glBindFramebuffer(defaultFbo)

The clear forces a resolve on tilers which stalls the CPU for a little
while, thus producing jank during animations. This change moves the
clear to the next frame when we know we will have to execute a resolve
anyway.

Change-Id: Ic1939c25df20ed65a4c48dc81ee549b2cd8b6ec3