Page 1 of 1
[TI Asm] Tron Project
Posted: Tue 16 Dec, 2008 9:26 pm
by waeV
Well, I started getting back into assembly (but I'm still too lazy to spend the full 28 days taking the tutorial). I started by making a tron clone in basic, then refining it to make it run as fast as possible. I've reached the limits of Ti-basic, however, and anything with a halfway decent AI is pretty dang slow. Naturally, I turned to assembly.
Here's the pseudocode for what i did in Ti-Basic:
Code: Select all
Lbl A
pxl-on(x1,y1)
pxl-on(x2,y2)
prgmAISUB
getkey
determine direction based on input
inc / dec x and y variables according to direction
check if the pixel about to be turned on is already on, if so goto B
goto A
Lbl B
determine winner/loser
The first problem I see is that I don't know how to display the 1 pixel lightcycle. Can a sprite be defined as one pixel? Ideally there would be a pixel-on and pixel-text command that I could use.
Re: [TI Asm] Tron Project
Posted: Tue 16 Dec, 2008 10:01 pm
by King Harold
Well with asm, you don't have to use commands. You can just test/set the pixels directly, making it faster. Day 24 of the 28 days tells you most of what you should know about testing/setting pixels. If the pixel-coordinate is a constant (not likely, but who knows?) you could just use the bit/set instructions. Theoretically it's also possible for non-constant coordinates, but not usually a good plan (smc or a large switch block for something so simple?)
Now that I think about it, maybe smc
would be viable alternative..
Maybe something like this?
Code: Select all
CheckPixel:
;returns Z if white, NZ if black
;A = x coordinate
;L = y coordinate
;coordinates must be inside the valid range for the result to make sense
ld h,0
ld d,h
ld e,l
add hl,hl
add hl,de
add hl,hl
add hl,hl
ld e,a
srl e
srl e
srl e
add hl,de
ld de,PlotScreen
add hl,de
and 7
add a,a
add a,a
add a,a
or $46
ld (bit+1),a
bit:
bit 0,(hl)
ret
Ok maybe not such a good plan after all, this is huge, and mostly a copy of GetPixel.. But no loop (which can only be up to 7 iterations long anyway..)
Re: [TI Asm] Tron Project
Posted: Tue 16 Dec, 2008 10:34 pm
by waeV
Oh, ok I don't know why I didn't think to look in day 24, I was milling about in the sprite section. Thanks.
Re: [TI Asm] Tron Project
Posted: Wed 17 Dec, 2008 3:14 am
by cjgone
Ah... I remember learning sprites in 28 days and being utterly confused for like an extremely long time.
Have fun with that I guess.
