+++ This bug was initially created as a clone of Bug #999694 +++ Bug 999694 add EGL fence support to SharedSurface_Gralloc. But we can not use this in ICS devices like hamachi. It can not do correct syncing. WebGL rendeirng tearing could be observed by the following STR. - [1] start crystalskull - [2] touch screen and keep the skull rotating This problem was already mentioned in Bug 843599 Comment 15 :-(

Nominate to b2g-v1.4 It is a serious regression for ICS devices.

During [2] the problem seems more difficult to reproduce than before. It might be an effect from Bug 1006957. Just after start up the crystalskull app, the problem seems easier to observe.

Is this applicable to KK or JB devices?

(In reply to Preeti Raghunath(:Preeti) from comment #3) > Is this applicable to KK or JB devices? This problem happens only on qcom ICS device.

Confirmed the patch works on hamachi.

Comment on attachment 8443937 [details] [diff] [review] patch - disable sync fence on AdrenoTM200 Review of attachment 8443937 [details] [diff] [review]: ----------------------------------------------------------------- ::: gfx/gl/SharedSurfaceGralloc.cpp @@ +179,5 @@ > // When Android native fences are available, try > // them first since they're more likely to work. > // Android native fences are also likely to perform better. > + if (!disableSyncFence && > + mEGL->IsExtensionSupported(GLLibraryEGL::ANDROID_native_fence_sync)) { Drop { to next line for multi-line conditionals. @@ +204,5 @@ > } > } > > + if (!disableSyncFence && > + mEGL->IsExtensionSupported(GLLibraryEGL::KHR_fence_sync)) { Drop { to next line for multi-line conditionals.