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hiscore.asm
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hiscore.asm
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;********************************************************************
;* *
;* HISCORE.Z80 *
;* *
;* Version 1 *
;* *
;* Copyright H. Mulder, 1999 *
;* *
;* *
;* This unit was made to give a ready-to-use solution for Hiscores. *
;* *
;* HiScores (ie: the number of points a player has scored) have a *
;* tendency to be quite large, making calculations and displaying *
;* not easy when operating in a 8-bit environment. On the other *
;* hand, not much is done with a Hiscore: points are added to it, *
;* it needs to be displayed, and some ranking is needed, but that's *
;* about it. *
;* *
;* This unit introduces a special data-type, called a HiScore: *
;* *
;* A HiScore is a set of bytes, whereby each byte represents one *
;* digit in the decimal number, with the highest digit on the *
;* left. If the contained number is smaller than the allocated *
;* space, it is filled up with $80 on the left side. *
;* *
;* Some examples (the size of a HiScore is 8): *
;* *
;* 100 = 80 80 80 80 80 01 00 00 *
;* 30510 = 80 80 80 03 00 05 01 00 *
;* 99999999 = 09 09 09 09 09 09 09 09 *
;* *
;* *
;* Notes: *
;* *
;* The default size of a Hiscore is 8, but this can be changed by *
;* changing the value of HISCORE_LENGTH in HISCORE.INC. It's value *
;* can be between 6 and 255. Note that ALL Hiscores in your program *
;* use this size, and this size alone. *
;* *
;* If a HiScore overflows, it will keep on counting, ignoring the *
;* overflow. so, adding 4 to 99999999 will result in 00000003. *
;* *
;* *
;* Functions: *
;* *
;* ResetHiScore *
;* *
;* Use this function to reset a Hiscore to 0. Always reset a *
;* Hiscore before using it. *
;* *
;* *
;* AddHiScore *
;* *
;* This function will add one Hiscore to another. *
;* *
;* *
;* AddBCHiScore *
;* *
;* This function will add the value of BC to a Hiscore. *
;* *
;* *
;* CpHiScore *
;* *
;* Use this function to compare two Hiscores. *
;* *
;* *
;* Extra info: *
;* *
;* This unit is Public Domain; you can use it in any way you want. *
;* Use this unit at your own peril; I cannot be blamed for any *
;* damage resulting in it's use. *
;* You are free to redistribute it, as long as you do so using the *
;* original package. *
;* *
;* I can be contacted via [email protected]. Goto my site at *
;* http://www.casema.net/~hpmulder for more info about Gameboy *
;* programming. *
;* *
;* *
;* History: *
;* *
;* 7 March 1999 Initial release *
;* *
;********************************************************************
INCLUDE "hiscore.inc"
SECTION "HiScore Code", ROM0
ResetHiScore:
;********************************************************
;* *
;* Resets the Hiscore at location HL to 0. Always reset *
;* a HiScore before usage. *
;* *
;* Parameters: *
;* *
;* [hl] = Destination (should be RAM) *
;* *
;* Destroys: *
;* af, bc, hl *
;* *
;********************************************************
;push hl
;push bc
ld c,HISCORE_LENGTH-1
ld a, $80 ; Set to empty
.L1:ld [hl+],a
dec c
jr nz, .L1
xor a ; last should be "0"
ld [hli],a
; Don't protect HL, since in InitStatus we initialize a variable
; trailing a call to ResetHiScore.
;pop bc
;pop hl
ret
AddHiScore:
;***********************************************************
;* *
;* Adds HiScore at location DE to HiScore at location HL. *
;* *
;* Parameters: *
;* *
;* [hl] = Destination (should be RAM) *
;* [de] = Source *
;* *
;* Destroys: *
;* af *
;* *
;***********************************************************
push hl
push de
push bc
ld bc, HISCORE_LENGTH-1
add hl,bc ; set to right-most number
push hl
ld h,d
ld l,e
add hl,bc ; set to right-most number
ld e,l
ld d,h
pop hl
inc c ; c = HISCORE_LENGTH
; b = 0 = no residue
.L1:ld a,[de] ; addition
and $7F ; set empty to 0
call IntHiScore
dec de
dec c
jr nz, .L1
pop bc
pop de
pop hl
ret
AddBCHiScore:
;***********************************************************
;* *
;* Adds value of BC to HiScore at location HL. *
;* *
;* Parameters: *
;* *
;* [hl] = Destination (should be RAM) *
;* bc = Value to add *
;* *
;* Destroys: *
;* af *
;* *
;***********************************************************
push hl
push de
push bc
ld de, HISCORE_LENGTH-1
add hl,de ; set to right-most number
ld de,IntHiScoreTable ; internal bin2dec table
.L1:srl b
rr c ; bc >> 1
jr nc, .L5
; bit is set; add value from table
push hl
push bc
ld bc,$0005 ; b = no addition, c = table-entry length
.L3: ld a,[de]
inc de
call IntHiScore ; add table-entry
dec c
jr nz, .L3
ld c,HISCORE_LENGTH-5
.L4: xor a
call IntHiScore ; add possible residue
dec c
jr nz, .L4
pop bc
pop hl
jr .L2
.L5: ; bit not set, next table entry
inc de
inc de
inc de
inc de
inc de
.L2:ld a,c
or b ; bc = 0 ?
jr nz, .L1
pop bc
pop de
pop hl
ret
CpHiScore:
;*************************************************
;* *
;* Compares HiScore at location DE with HiScore *
;* at location HL. *
;* *
;* Parameters: *
;* *
;* [hl] = Destination *
;* [de] = Source *
;* *
;* Returns: *
;* *
;* CF = [hl] is lower than [de] *
;* NCF = [hl] is equal or higher than [de] *
;* *
;* Destroys: *
;* af *
;* *
;*************************************************
push hl
push de
push bc
ld c, HISCORE_LENGTH
.L1:ld a,[de]
and $7F
inc de
ld b,a ; b = number in Source
ld a,[hl+]
and $7F ; a = number in dest
cp b
;jr c, .L2 ; a < b => [hl] < [de]
jr nz,.L2 ; at least one non-zero, highest 10s place w/ diff #'s is the deciding place
dec c
jr nz, .L1
.L2:
pop bc
pop de
pop hl
ret
;********** INTERNAL SUPPORT ************
IntHiScore:
; [Internal function]
; a = number to add
; b = residue from previous call
; [hl] = number to add to
add b ; add residue
ld b,a
ld a,[hl] ; base
and $7F ; set empty to 0
add b ; add total addition
ld b,0 ; clear residue
jr nz, .L3 ; jump if number <> "0"
ld a,[hl] ; current number empty ?
and $80 ; Yes/No
jr .L2
.L3:cp 10
jr c, .L2 ; jump if number < 10
sub 10 ; correct number
inc b ; setup residue
.L2:ld [hl-],a ; write number
ret
SECTION "HiScore Lookup Table", ROMX
IntHiScoreTable:
; bin2dec lookup table
db 1,0,0,0,0
db 2,0,0,0,0
db 4,0,0,0,0
db 8,0,0,0,0
db 6,1,0,0,0
db 2,3,0,0,0
db 4,6,0,0,0
db 8,2,1,0,0
db 6,5,2,0,0
db 2,1,5,0,0
db 4,2,0,1,0
db 8,4,0,2,0
db 6,9,0,4,0
db 2,9,1,8,0
db 4,8,3,6,1
db 8,6,7,2,3
;* End of HISCORE.Z80 *