When there is sound, when there is a GUI, and when GB/GBC functionality is integrated. I'm not touching sound until many of the graphical issues are sorted out. The screenshots look fine (why would I post broken stuff? 
) but there are still many unemulated components (sprite scaling/rotation, special effects like blending, brightness adjustments). It can play games well enough, but you'll notice stuff is missing eventually.
) but there are still many unemulated components (sprite scaling/rotation, special effects like blending, brightness adjustments). It can play games well enough, but you'll notice stuff is missing eventually.