[cairo] add glClear

Henry (Yu) Song - SISA hsong at sisa.samsung.com
Wed Feb 20 12:19:05 PST 2013

Hi, Chris

Do you think it is a good idea to add glClear right after glXSwapBuffers/eglSwapBuffers in cairo.  The reason is I know some (might be all?) drivers use glClear as an indicator to start a new frame and thus reset some buffers, for example, buffers in glDraw().  


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