Ok, so for a game I've been making a rudimentary scripting language for making cutscenes.
http://eeems.pastebin.com/2zZJPQJV is the code for the parser and I'm running this script through it:
Code: intro_scene:
Pclearscreen
Psprite(8,8,BlackMage,P8x16)
Pupdatescreen
Pwait(1)
Prect(8,8,16,16,0)
Psprite(6,8,BlackMage,P8x16)
Pupdatescreen
Ptext(0,0,"This is a cutscene")
Pupdatescreen
Ppause
Pend
For some reason it's erroring for no reason, I believe that there might be a problem with how I setup one of the command routines, but I'm not sure. In the parser hl is the current position in the script and during the check a contains what the current token is.
If you want to know what any of the routines I use are just let me know, but they shouldn't cause any problems unless somehow they change HL, which I'm pretty sure I've protected against.
Any ideas?
Error: 
and without that second Psprite() it works
Code: _ ld a,d
push hl
push bc
call putSprite8xb
pop bc
pop hl
inc hl
ret
_ push hl
push ix
pop hl
call putmaskedSprite
pop hl
ret
Why does one get an inc hl and the other doesn't? Also, for some reason your command choice macro assumes weird flag states exiting your routines to indicate errors (or lack thereof), which I don't see you guaranteeing at all.
Oh, well the second one hasn't been called, but that was trying to figure out if it was exiting in the wrong position.
I forgot about the flags x.x I need to add a push af / pop af around the call
it isn't for errors, it's for saving time on the checks and jumping back to the start
I'll check to see if that is the problem
EDIT: thanks, that was it!
Woot, glad I could help. Please continue to use this thread to ask for help on this project, and hopefully make a project thread about it soon.
ok, this routine when I run it with this script
Code: Psprite(8,16,BlackMage,P8x16m)
it somehow goes to the game engine but quits like it's still in the parser...
here is the code in questionCode: parse_sprite:
inc hl
ld d,(hl) ;x
inc hl
ld e,(hl) ;y
inc hl
push de
ld e,(hl)
inc hl
ld d,(hl)
push de
pop ix
pop de ;pointer
inc hl
ld a,(hl) ;type
cp 2
jr z,++++_ ;8*16 masked
cp 1
jr z,_ ;8*16
ld b,8 ;8*8
jr ++_
_ ld b,16
_ ld a,d
push hl
push bc
call putSprite8xb
pop bc
pop hl
ret
_ push hl
push ix
pop hl
call putmaskedSprite
pop hl
ret
it specifically is calling the second part, where call putmaskedSprite is
And this bug doesn't happen when you don't include the sprites in the cutscene?
That bug doesn't happen when I don't use P8*16m and instead one of the other two formats.
EDIT: error was actually one too many + signs
ok, not a question about the scripting part, but I was wondering if anybody could walk me through storing data in an appvar and recalling that data
Creating an AppVar:
Code: ld hl,AppVarName
rst 20h
bcall(_chkfindsym)
jr nc,AlreadyExists
ld hl,appvarsize
bcall(_createappvar)
ret
AppVarName:
.db $15,"MYAVAR"
Accessing:
Code: ld hl,AppVarName
rst 20h
bcall(_chkfindsym)
jr c,DoesNotExist
ld hl,offsetthatwewant+2 ;+2 is for the size word
add hl,de
;now hl is offsetthatwewant bytes into the data
Thanks Kerm!
EDIT: Erm, I noticed you said something about size bytes, what are they for? I'm guessing pretty much, how would I save to an appvar correctly
Eeems wrote:
Thanks Kerm!
EDIT: Erm, I noticed you said something about size bytes, what are they for? I'm guessing pretty much, how would I save to an appvar correctly
Well, you have to define the size of the appvar. 
I'm hoping you're going to try to maintain your sanity by not trying to resize appvars on the fly with your first exploration of using them. When you call _chkfindsym, (de) and (de+1) are the LSB and MSB respectively of the size of the appvar.
Well the size is going to be constant, and I'm going to use BlackMageStats-SaveEnd to define how big that actually is. For saving over data in the appvar would I do
Code: inc de
inc de
ld bc,BlackMageStats-SaveEnd
ld hl,BlackMageStats
ldir
or would that be an issue?
Assuming that that code goes after the bcall(_chkfindsym), that would work quite well.
ok, for some reason, this code:
Code: engine_save:
call tobackbuff
homeup
ld hl,save_appvar_name
rst 20h
bcall(_chkfindsym)
jr nc,_ ;if it exists jump to saving
ld hl,BlackMageStats-SaveEnd
bcall(_createappvar)
_ inc de
inc de
ld hl,BlackMageStats
ld bc,BlackMageStats-SaveEnd
ldir
wrappedtext(saved_text)
lcdupdate
call Pausekey
call frombackbuff
jp engine_return
causes this:
I know it's the ldir that causes it, because commenting it out fixes things
Errr, I'm pretty sure you made the rookie mistake of "BlackMageStats-SaveEnd " instead of "SaveEnd-BlackMageStats"?
Hmm, and in my head I had even thought to make sure I had the right order...x.x
Eeems wrote:
Hmm, and in my head I had even thought to make sure I had the right order...x.x
Don't worry, I do that more often than I'd like to admit. Does it work now?
It works great
32 bytes so far in the appvar
EDIT: oh yeah, and to protect against the appvar being archived on load/save?
Eeems wrote:
It works great
32 bytes so far in the appvar
EDIT: oh yeah, and to protect against the appvar being archived on load/save?
Eeems wrote:
For some reason it's erroring for no reason
Wait... What?
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