how to observe openVG drawing process?

hi all:
if only using double buffer and glutswapbuffer, i cant observe the drawing process.

so, does any one know how to observe the OpenVG drawing process??

single buffer?? how to do that?

Sounds like you want a pixmap surface. You can create one with the egl call:

I don’t think all egl configurations support pixmap surfaces, though (as sometimes/often single buffering is simply not possible).