Wait for vsync in lcd_blit calls

[Vogtinator]

Seems to work in firebird, not tested on HW yet.

[Vogtinator]

It might not be safe to call idle() inside resources code as the application might've configured the used timer weirdly. So this needs some testing first.

[KryptonicDragon]

I believe it might be useful to have two separate lcd_blit() commands, one that waits for vsync, and one that doesn't.

[gameblabla]

Used the wait_for_vsync code (separately, not within ndless) for my Picodrive port and it seemed to work fine on real hardware for the tester so far at least.

[gameblabla]

Hmm, so the vsync code seems not to work properly, even when used outside of lcd_blit and within the app itself.
At least that's the case on my CX II with Temper.

[Vogtinator]

Yeah, the CX HW-W+ LCD (so also CX II) needs some more tricks to get proper vsync.