As a part of my GSoC project I'm working on adding OMX_UseEGLImage
support in gallium/st/omx.
I have an egl_display (OMX_NATIVE_WINDOWTYPE) and the EGLImage in the
H.264 decoder component. I'm looking some sort of method to get mesa pipe
screen pointer (or some other pipe structure) from the egl_display and from
which I can get struct pipe_surface and eglimage pointer/id.
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