Sega Genesis Spriting

[Chilly Willy]

Shadow/hilite is really stupidly complicated on the Genesis.

First case: if no sprites are overlapping, scroll layer A can shadow B (or the background G color if B is transparent) if the priority of both is 0.

Second case: if overlapping sprite with sprite pixel NOT color palette 3, index 14 or 15, the sprite will shadow A/B/G if all the priorities are 0, or A will shadow B/G if the sprite priority is 1 and A and B are 0.

Third case: if overlapping sprite whose pixel is palette 3, index 14, the sprite pixel will hilite any layer beneath it as long as the priority bit for A and/or B are set. The sprite pixel acts as transparent since it's used as a flag, not an actual pixel.

Fourth case: if overlapping sprite whose pixel is palette 3, index 15, the sprite pixel will shadow the overlapping pixel unless the priority for A and B are both 1 and the priority for S is 0, in which case it only shadows G. Again, the sprite pixel is transparent since it's used as a flag, not an actual pixel.

[Jony]

[letoulousain]

When making MD graphics, how can i know which colors are supported and which ones aren't?

freeware PalAdjust.exe (for win) color Mode 3Bits

http://www.yaronet.com/posts.php?s=136586

[KanedaFr]

great one....
my old GOP also did this