Thomas Jentzsch wrote:
> Well, the most compact way is (as always) to count down (8 bytes):
>
> dec FrameCounter
> bpl .skipReset
> lda #2
> sta FrameCounter
> .skipReset
Hehe, you'd need another 2 Bytes to actually load the counter.
At the moment, I use the table Andrew suggested:
LDX bulletCounter
LDY bulletcountertab,X
STY bulletCounter
Now Y is already indexing with 0/1/2.
10 bytes too, but faster.
But very interesting to see so many variations on such a simple theme
:-)
> But I don't know an EOR trick for this too.
The mighty EOR then works only with powers of two, or was that even
numbers?
> > Just for the record, can someone come up with an elegant 'division by 3'
> > solution?
> I guess, what you need is a framecounter that allows you to do
> something every 2nd, 3rd or maybe 6th frame. I had the same problem
> with Thrust too. My solution was to combine both counters into one byte.
> I used the upper two bits for counting to 3 and the lower 6
> bits for counting up to 64.
I have three fields of bullet data and have to continously replace
replace them every frame, so that the three sets of bullets are
displayed evenly. With a power of two, one would just
INC FrameCounter
LDA FrameCounter
AND $XX
TAX
This would leave the frame counter intact for other use.
Greetings,
Manuel
-
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
