I've been messing around for a while now with some
playfield stuff, but I haven't gotten to doing players
yet. My question concerns the method I was thinking
of for doing the player sprite lookup, since I'm as
yet not fully enlightened on the subject. :)
For the thing I'm working on, the kernel time is
pretty tight already because I'm drawing a dynamic,
asymmetrical playfield (a la Maze Craze). Because of
the lack of time, I was thinking of just using a load
with an 'Indirect Y' addressing mode to fetch, first,
the ROM index address from RAM, and then, using the Y
(scan line) offset, fetch the actual data. If I do
this for 192 lines, though, I think that's going to
mean that I have to have quite a bit of wasted (blank)
ROM space both before and after the actual player
graphic. Also the blank space + graphic would stretch
over multiple pages. But, by just changing the lookup
value in RAM, I guess I could change where the player
would appear vertically on the screen, right? Kind of
like positioning a foosball soccer man with the metal
stick. :)
Anyway, like I said, I don't really know what the
standard player graphic-loading methods are. Right
now I'm just wondering if this is a viable (albeit
wasteful) method. I think it is, but I need some
insight...
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