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2005-10-03 18:43

Bastet

Registered: Jul 2005
Posts: 88

[gamedev] Reading level data problem

Hi Folks!

I try to code something in asm, and as i like them its going to be a simple RPG.
But now i have a little problem, how to read the map data?
I have this, hardcoded for now, testdungeon in my programm:

party: ;X first and then Y
!byte $01,$02

dungeon1: ;16x16 grid of map data
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$01,$01,$01,$00,$01,$01,$01,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$01,$00,$01,$00,$01,$00,$01,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$01,$00,$01,$01,$01,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$01,$01,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
!byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00

As i am used to do high level programming, i cant figure out how to get something from there with the party coordinates.
I hope somebody can give at least a hint how to get an address out of x and y.

... 19 posts hidden. Click here to view all posts....

2005-10-08 12:15

Ben
Account closed

Registered: Feb 2003
Posts: 163

Quote: Nah... For coding counts in the end thaT it worx and do what it should do how i look like is equal to my opinion...

There are many ways leading to rome...

If the operational specifications of 'doing' also includes executing in the minimum number of cycles then these 5 cycles being won (under equal conditions) do make a difference clearly..

2005-10-09 07:30

Bastet

Registered: Jul 2005
Posts: 88

Hey, i am coding a game, not a demo ;)
Aaaand i got an idea of manipulating the charset. Ok, i have done it the cheapest way possible, made it with cuneinform, inserted it into the source at $2000 and told the VIC where to find it.

If you want to see.
--> http://fileanchor.com/5356-d (1683 byte -ZIP)

Dev is slow but steady.
Next stop is a messaging system using the last 5 lines on the screen or so.
After that i will include the PCs and then the first NPCs, with them a battle screen.

If anyone wants to give me some GFX, be my guest ^.^

2005-10-09 12:24

Ben
Account closed

Registered: Feb 2003
Posts: 163

Looks better already :)
What kind of game is this supposed to become?

2005-10-09 14:40

Laxity

Registered: Aug 2005
Posts: 459

"lda y"?... what compiler are you guys using? Shouldn't that be "tay"?

2005-10-09 15:14

Ben
Account closed

Registered: Feb 2003
Posts: 163

Quote: "lda y"?... what compiler are you guys using? Shouldn't that be "tay"?

Hehe :)

x and y are variables of some sort..
This pseudocode would obviously become

a)
"y lda #0"
with y the label, where you would need to "sta y+1".
This would compile to something like "sta $1001"

b)
"y .byte 0
[..]
lda y"
where you would need to "sta y", which would compile to something like
"1000 0
1001 lda $1001
"
and "sta $1000"

c)
"y = $d0
[..]
lda y"
where you would need to "sta y", which would compile to
"lda $d0" and "sta $d0"

et cetera.. et cetera..

2005-10-09 16:38

Bastet

Registered: Jul 2005
Posts: 88

Quote: Looks better already :)
What kind of game is this supposed to become?

A RPG of some sort

2005-10-09 17:04

Laxity

Registered: Aug 2005
Posts: 459

Quote: Hehe :)

x and y are variables of some sort..
This pseudocode would obviously become

a)
"y lda #0"
with y the label, where you would need to "sta y+1".
This would compile to something like "sta $1001"

b)
"y .byte 0
[..]
lda y"
where you would need to "sta y", which would compile to something like
"1000 0
1001 lda $1001
"
and "sta $1000"

c)
"y = $d0
[..]
lda y"
where you would need to "sta y", which would compile to
"lda $d0" and "sta $d0"

et cetera.. et cetera..

doh! Stupid me ;)

2005-10-10 13:20

White Flame

Registered: Sep 2002
Posts: 136

Using ORA instead of ADC lets you get rid of the CLC:

lda party+1 ;y
asl
asl
asl
asl
ora party ;x
tax
lda dungeon1,x

Then again, if your party 'x' and 'y' are guaranteed to be between 0 and 15, carry would be clear at that point regardless.

2005-10-10 14:08

Oswald

Registered: Apr 2002
Posts: 5076

gah, I shouldnt at first post into this topic, I knew all smartheads will show up and tell how it could be done 1 cycle faster or 1 byte shorter :)

2005-10-10 14:28

JackAsser

Registered: Jun 2002
Posts: 2014

@Oswald: Isn't that what C64 is all about? :D

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