Tests I'd done long ago suggested this wasn't right, but we made other
timing fixes since then, and now tests are showing this is the right
order.
May improve Patapon/etc. timing, or may hurt it...
Has been used in previous Symbian releases to improve speed. Was thought to only work on Wipeout but actually works on most games?
Games that run based on internal timer will experience 60 VPS without frameskip.
Turns out it's a deadline to wake up by, which makes sense.
sceDisplayWaitVblankStartMultiCB 10
-> Callback
sceDisplayWaitVblankStartMultiCB 2
+2 vblanks
<- Thread
+8 more vblanks
Turns out it's one hell of a lot and we really should fix this by
checking both vertices and textures to deduce when we can just skip
alpha testing safely, probably quite often.
I care about this because alpha testing drawing is very expensive
on some mobile chips.
This is to get an idea if it would be beneficial to compile and cache display lists. Looks like it would be for some games, for example in GTA it's often 20k/80k/20k commands per frame - that is 100k executed commands per frame that could potentially just be executed instead of interpreted. Likewise in Wipeout. Of course, this means yet another cache with invalidation issues etc..
