opengl es - Open GL ES creating Off-screen -

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i stuck following while creating off-screen surface using opengl es 2.0 :

1. how create off-screen surface using eglcreatepixmapsurface()?
2. eglcreatepixmapsurface() api takes eglnativepixmaptype parameter, eglnativepixmaptype? how find structure definiton? can make on own? ( in code base declare void * )
3.once drawing done on native pixmap surface, how access native pixmap data?

i have searched in internet alot find relevant informative examples.any appreciated.


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