Clutter EGLX Backend doesn't work correctly

Recently, our team work hard on ARM platform which is TI OMAP 3530, and also it makes us crazy actually. As you know that source code of TI PowerVR driver and SGX is not publicly available, there is no open source solution cause it's difficult to debug graphical stuffs.

If you have tried to use Clutter with EGLX Backend, you might get only the blank stage and nothing works correctly. It happened due to X server might still have things in its buffer to render when swap buffers.

Here is a patch to solve this problem:

http://people.linux.org.tw/~fred/patches/clutter-1.0_1.0.8-wait-for-vsync-before-SwapBuffers.patch

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