Glenn wrote:
> You have verified that there is no tearing for all position combinations?
Yup. :-)
> If that's the case then if you add in the simplified ball code I'd consider
> the main kernel done (save for the score section of course).
Just one single ball with different color that will be enabled once,
right?
Ok, I'll compile some source and post it tomorrow.
> Speaking of which, how different is the driving controller code you
> used for Thrust+ DC and Asteroids+ DC vs. what I employed in the last
> build of DD? I'm guessing yours is more compact.
Yes. It's basically quite exactly like the version Eckhard and I had
posted here. But it got a bit more complicated when I had to share a
register with other code (lots of masking operations).
Here is the Asteroids DC code:
lda lastDir
and #%11100111
tay
eor lastDir
sty lastDir
lsr
lsr
lsr
tay
lda SWCHA
and #%11
asl
asl
asl
ora lastDir
sta lastDir
lda SWCHA
and #%11
eor NextDCTab,y ; works like cmp for beq
beq .leftTurn
eor #%11
beq .rightTurn
bne .noTurn
.leftTurn:
dec dir
.byte $2c ; BIT_W
.rightTurn:
inc dir
.noTurn:
NextDCTab:
.byte %01, %11, %00, %10
You can see that I'm only using the bits 3 + 4 in lastDir. If you have a
complete register the first part of the code gets *much* easier:
ldy lastDir
lda SWCHA
and #%11
sta lastDir
lda SWCHA
...
> Also, your current kernel is loading the car sprites the same way I
> was doing it before so I can just plug the controller/rotation code
> back in, right?
Depends on the coordinate system you where using. Mine starts at the
left and top of the screen. For vertical wrapping you should define the
top of the screen to start at CAR_HEIGHT-1.
Have fun!
Thomas
_______________________________________________________
Thomas Jentzsch | *** Every bit is sacred ! ***
tjentzsch at web dot de |
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