as know far, surfaceflinger providers surfaces app render , composite surfaces final screen. (if mistake, please point out thx).
first question: surface created surfaceflinger global available can used processes. (is memory of surface in gpu memory?)
while googled not possible share opengl context between processes(here mean app process , surfaceflinger process). i'm not sure if gpu memory used surface?
if answer first question yes, there opengl resource sharing surfaceflinger when app render surface? , how these shard things including memory of surface worked?
there difference between android surface , egl surface. closely related not same thing.
egl surfaces, created methods eglcreatewindowsurface(), can associated egl context , used targets rendering. cannot shared between processes.
android surfaces wrappers bufferqueue objects, provide way move graphics buffers around system. buffer app rendering can passed between app , surfaceflinger, none of egl state passed along. surfaceflinger gets finished product.
the system described in detail in graphics architecture document.
