/
GRAFIX.S
executable file
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GRAFIX.S
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* grafix
CopyProtect = 1
EditorDisk = 0
org = $400
tr on
lst off
lstdo off
*-------------------------------
*
* PRINCE OF PERSIA
* Copyright 1989 Jordan Mechner
*
*-------------------------------
org org
jmp GR
jmp DRAWALL
jmp CONTROLLER
jmp dispversion
jmp SAVEBLUE
jmp RELOADBLUE
jmp MOVEMEM
jmp BUTTONS ;ed
jmp GTONE
jmp SETCENTER
jmp DIMCHAR
jmp CVTX
jmp ZEROPEEL
jmp ZEROPEELS
jmp PREAD
jmp ADDPEEL
jmp COPYSCRN
jmp SNGPEEL
jmp RND
jmp CLS
jmp LAY
jmp FASTLAY
jmp LAYRSAVE
jmp LRCLS
jmp FASTMASK
jmp FASTBLACK
jmp PEEL
jmp GETWIDTH
jmp COPY2000
jmp COPY2000MA
jmp SETFASTAUX
jmp SETFASTMAIN
jmp LOADLEVEL
jmp ATTRACTMODE
jmp XMINIT
jmp XMPLAY
jmp CUTPRINCESS
jmp XTITLE
jmp COPY2000AM
jmp RELOAD
jmp LOADSTAGE2
jmp RELOAD
jmp GETSELECT
jmp GETDESEL
jmp EDREBOOT ;ed
jmp GOBUILD ;ed
jmp GOGAME ;ed
jmp WRITEDIR ;ed
jmp READDIR ;ed
jmp SAVELEVEL ;ed
jmp SAVELEVELG ;ed
jmp ADDBACK
jmp ADDFORE
jmp ADDMID
jmp ADDMIDEZ
jmp ADDWIPE
jmp ADDMSG
jmp SAVEGAME
jmp LOADGAME
jmp ZEROLSTS
jmp SCREENDUMP
jmp MINIT
jmp MPLAY
jmp SAVEBINFO
jmp RELOADBINFO
jmp INVERTY
jmp NORMSPEED
jmp ADDMIDEZO
jmp CALCBLUE
jmp ZERORED
jmp XPLAYCUT
jmp CHECKIIGS
jmp FASTSPEED
jmp MUSICKEYS
jmp DOSTARTGAME
jmp EPILOG
jmp LOADALTSET
jmp XMOVEMUSIC
jmp WHOOP
VBLvect jmp VBLANK ;changed by InitVBLANK if IIc
jmp VBLI ;VBL interrupt
*-------------------------------
lst
put eq
lst
put gameeq
lst
put soundnames
lst off
*-------------------------------
dum locals
]temp
]dest ds 2
]source ds 2
]endsourc ds 2
index ds 1
dend
*-------------------------------
* Apple soft switches
IOUDISoff = $c07f
IOUDISon = $c07e
DHIRESoff = $c05f
DHIRESon = $c05e
HIRESon = $c057
HIRESoff = $c056
PAGE2on = $c055
PAGE2off = $c054
MIXEDon = $c053
MIXEDoff = $c052
TEXTon = $c051
TEXToff = $c050
ALTCHARon = $c00f
ALTCHARoff = $c00e
ADCOLon = $c00d
ADCOLoff = $c00c
ALTZPon = $c009
ALTZPoff = $c008
RAMWRTaux = $c005
RAMWRTmain = $c004
RAMRDaux = $c003
RAMRDmain = $c002
ADSTOREon = $c001
ADSTOREoff = $c000
RWBANK2 = $c083
RWBANK1 = $c08b
USEROM = $c082
*-------------------------------
* Key equates
CTRL = $60
ESC = $9b
DELETE = $7f
SHIFT = $20
ksound = "s"-CTRL
kmusic = "n"-CTRL
*-------------------------------
* Joystick "center" width (increase for bigger center)
cwidthx = 10 ;15
cwidthy = 15 ;21
*-------------------------------
* Addresses of character image tables
* (Bank: 2 = main, 3 = aux)
chtabbank db 2,2,2,3,2,3,3
chtablist db #>chtable1,#>chtable2,#>chtable3,#>chtable4
db #>chtable5,#>chtable6,#>chtable7
dummy db maxpeel,maxpeel
*-------------------------------
*
* A D D B A C K
*
* Add an image to BACKGROUND image list
*
* In: XCO, YCO, IMAGE (coded), OPACITY
*
* IMAGE bit 7 specifies image table (0 = bgtable1,
* 1 = bgtable2); low 6 bits = image # within table
*
*-------------------------------
ADDBACK ldx bgX ;# images already in list
inx
cpx #maxback
bcs :rts ;list full (shouldn't happen)
lda XCO
sta bgX,x
lda YCO
cmp #192
bcs :rts
sta bgY,X
lda IMAGE
sta bgIMG,X
lda OPACITY
sta bgOP,X
stx bgX
:rts
]rts rts
*-------------------------------
*
* A D D F O R E
*
* Add an image to FOREGROUND image list
*
* In: same as ADDBACK
*
*-------------------------------
ADDFORE ldx fgX
inx
cpx #maxfore
bcs ]rts
lda XCO
sta fgX,X
lda YCO
cmp #192
bcs ]rts
sta fgY,X
lda IMAGE
sta fgIMG,X
lda OPACITY
sta fgOP,X
stx fgX
]rts rts
*-------------------------------
*
* A D D M S G
*
* Add an image to MESSAGE image list (uses bg tables)
*
* In: XCO, OFFSET, YCO, IMAGE (coded), OPACITY (bit 6 coded)
*
*-------------------------------
ADDMSG ldx msgX
inx
cpx #maxmsg
bcs ]rts
lda XCO
sta msgX,X
lda OFFSET
sta msgOFF,X
lda YCO
sta msgY,X
lda IMAGE
sta msgIMG,X
lda OPACITY
sta msgOP,X
stx msgX
]rts rts
*-------------------------------
*
* A D D W I P E
*
* Add image to wipe list
*
* In: XCO, YCO, height, width; A = color
*
*-------------------------------
ADDWIPE ldx wipeX
inx
cpx #maxwipe
bcs ]rts
sta wipeCOL,x
lda blackflag ;TEMP
beq :1 ;
lda #$ff ;
sta wipeCOL,x ;
:1
lda XCO
sta wipeX,x
lda YCO
sta wipeY,x
lda height
sta wipeH,x
lda width
sta wipeW,x
stx wipeX
]rts rts
*-------------------------------
*
* A D D M I D
*
* Add an image to mid table
*
* In: XCO, OFFSET, YCO, IMAGE, TABLE, OPACITY
* FCharFace, FCharCU-CD-CL-CR
* A = midTYP
*
* midTYP bit 7: 1 = char tables, 0 = bg tables
* midTYP bits 0-6:
* 0 = use fastlay (normal for floorpieces)
* 1 = use lay alone
* 2 = use lay with layrsave (normal for characters)
*
* For char tables: IMAGE = image #, TABLE = table #
* For bg tables: IMAGE bits 0-6 = image #, bit 7 = table #
*
*-------------------------------
ADDMID ldx midX
inx
cpx #maxmid
bcs ]rts
sta midTYP,x
lda XCO
sta midX,x
lda OFFSET
sta midOFF,x
lda YCO
sta midY,x
lda IMAGE
sta midIMG,x
lda TABLE
sta midTAB,x
lda FCharFace ;- left, + right
eor #$ff ;+ normal, - mirror
and #$80
ora OPACITY
sta midOP,x
lda FCharCU
sta midCU,x
lda FCharCD
sta midCD,x
lda FCharCL
sta midCL,x
lda FCharCR
sta midCR,x
stx midX
]rts rts
*-------------------------------
*
* ADDMID "E-Z" version
*
* No offset, no mirroring, no cropping
*
* In: XCO, YCO, IMAGE, TABLE, OPACITY
* A = midTYP
*
*-------------------------------
ADDMIDEZ lda #0
sta OFFSET
ADDMIDEZO
ldx midX
inx
cpx #maxmid
bcs ]rts
sta midTYP,x
lda XCO
sta midX,x
lda OFFSET
sta midOFF,x
lda YCO
sta midY,x
lda IMAGE
sta midIMG,x
lda TABLE
sta midTAB,x
lda OPACITY
sta midOP,x
lda #0
sta midCU,x
sta midCL,x
lda #40
sta midCR,x
lda #192
sta midCD,x
stx midX
]rts rts
*-------------------------------
*
* A D D P E E L
*
* (Call immediately after layrsave)
* Add newly generated image to peel list
*
*-------------------------------
ADDPEEL lda PEELIMG+1
beq ]rts ;0 is layersave's signal to skip it
lda PAGE
beq :1
do CopyProtect
ldx purpleflag ;should be 1!
lda dummy,x
else
lda #maxpeel
fin
:1 sta :sm+1 ;self-mod
tax
lda peelX,x ;# of images in peel list
clc
adc #1
cmp #maxpeel
bcs ]rts
sta peelX,x
clc
:sm adc #0 ;0/maxpeel
tax
lda PEELXCO
sta peelX,x
lda PEELYCO
sta peelY,x ;x & y coords of saved image
lda PEELIMG
sta peelIMGL,x
lda PEELIMG+1
sta peelIMGH,x ;2-byte image address (in peel buffer)
]rts rts
*-------------------------------
*
* D R A W A L L
*
* Draw everything in image lists
*
* This is the only routine that calls HIRES routines.
*
*-------------------------------
DRAWALL
jsr DOGEN ;Do general stuff like cls
lda blackflag ;TEMP
bne :1 ;
jsr SNGPEEL ;"Peel off" characters
;(using the peel list we
;set up 2 frames ago)
:1 jsr ZEROPEEL ;Zero just-used peel list
jsr DRAWWIPE ;Draw wipes
jsr DRAWBACK ;Draw background plane images
jsr DRAWMID ;Draw middle plane images
;(& save underlayers to now-clear peel list)
jsr DRAWFORE ;Draw foreground plane images
jmp DRAWMSG ;Draw messages
*-------------------------------
*
* D O G E N
*
* Do general stuff like clear screen
*
*-------------------------------
DOGEN
lda genCLS
beq :1
jsr cls
* purple copy-protection
:1 ldx BGset1
cpx #1
bne ]rts
lda #0
sta dummy-1,x
]rts rts
*-------------------------------
*
* D R A W W I P E
*
* Draw wipe list (using "fastblack")
*
*-------------------------------
DRAWWIPE
lda wipeX ;# of images in list
beq ]rts ;list is empty
lda #1 ;start with image #1
:loop pha
tax
lda wipeH,x
sta IMAGE ;height
lda wipeW,x
sta IMAGE+1 ;width
lda wipeX,X
sta XCO ;x-coord
lda wipeY,X
sta YCO ;y-coord
lda wipeCOL,X
sta OPACITY ;color
jsr fastblack
pla
clc
adc #1
cmp wipeX
bcc :loop
beq :loop
]rts rts
*-------------------------------
*
* D R A W B A C K
*
* Draw b.g. list (using fastlay)
*
*-------------------------------
DRAWBACK lda bgX ;# of images in list
beq ]rts
ldx #1
:loop stx index
lda bgIMG,x
sta IMAGE ;coded image #
jsr setbgimg ;extract TABLE, BANK, IMAGE
lda bgX,x
sta XCO
lda bgY,X
sta YCO
lda bgOP,x
sta OPACITY
jsr fastlay
ldx index
inx
cpx bgX
bcc :loop
beq :loop
]rts rts
*-------------------------------
*
* D R A W F O R E
*
* Draw foreground list (using fastmask/fastlay)
*
*-------------------------------
DRAWFORE lda fgX
beq ]rts
ldx #1
:loop stx index
lda fgIMG,x
sta IMAGE
jsr setbgimg
lda fgX,x
sta XCO
lda fgY,x
sta YCO
lda fgOP,x ;opacity
cmp #mask
bne :1
jsr fastmask
jmp :cont
:1 sta OPACITY ;fastlay for everything else
jsr fastlay
:cont ldx index
inx
cpx fgX
bcc :loop
beq :loop
]rts rts
*-------------------------------
*
* S N G P E E L
*
* Draw peel list (in reverse order) using "peel" (fastlay)
*
*-------------------------------
SNGPEEL
ldx PAGE
beq :1
ldx #maxpeel
:1 stx :sm+1
lda peelX,x ;# of images in list
beq ]rts
:loop pha
clc
:sm adc #0 ;self-mod: 0 or maxpeel
tax
lda peelIMGL,x
sta IMAGE
lda peelIMGH,x
sta IMAGE+1
lda peelX,x
sta XCO
lda peelY,x
sta YCO
lda #sta
sta OPACITY
jsr peel
pla
sec
sbc #1
bne :loop
]rts rts
*-------------------------------
*
* D R A W M I D
*
* Draw middle list (floorpieces & characters)
*
*-------------------------------
DRAWMID
lda midX ;# of images in list
beq ]rts
ldx #1
:loop stx index
lda midIMG,x
sta IMAGE
lda midTAB,x
sta TABLE
lda midX,x
sta XCO
lda midY,x
sta YCO
lda midOP,x
sta OPACITY
lda midTYP,x ;+ use bg tables
bmi :UseChar ;- use char tables
jsr setbgimg ;protects A,X
jmp :GotTable
:UseChar jsr setcharimg ;protects A,X
:GotTable ;A = midTYP,x
and #$7f ;low 7 bits: 0 = fastlay, 1 = lay, 2 = layrsave
beq :fastlay
cmp #1
beq :lay
cmp #2
beq :layrsave
:Done ldx index
inx
cpx midX
bcc :loop
beq :loop
]rts rts
* midTYP values:
* 0 = use fastlay (normal for floorpieces)
* 1 = use lay alone
* 2 = use lay with layrsave (normal for characters)
:fastlay
jsr fastlay
jmp :Done
:layrsave
jsr :setaddl ;set additional params for lay
jsr layrsave ;save underlayer in peel buffer
jsr ADDPEEL ;& add to peel list
jsr lay ;then lay down image
jmp :Done
:lay jsr :setaddl
jsr lay
jmp :Done
:setaddl lda midOFF,x
sta OFFSET
lda midCL,x
sta LEFTCUT
lda midCR,x
sta RIGHTCUT
lda midCU,x
sta TOPCUT
lda midCD,x
sta BOTCUT
rts
*-------------------------------
*
* D R A W M S G
*
* Draw message list (using bg tables & lay)
*
* OPACITY bit 6: 1 = layrsave, 0 = no layrsave
*
*-------------------------------
DRAWMSG
lda msgX
beq ]rts
ldx #1
:loop stx index
lda msgIMG,x
sta IMAGE
jsr setbgimg
lda msgX,x
sta XCO
lda msgOFF,x
sta OFFSET
lda msgY,x
sta YCO
lda #0
sta LEFTCUT
sta TOPCUT
lda #40
sta RIGHTCUT
lda #192
sta BOTCUT
lda msgOP,x
sta OPACITY
and #%01000000
beq :1
lda OPACITY
and #%10111111 ;bit 6 set: use layrsave
sta OPACITY
jsr layrsave
jsr ADDPEEL
:1 jsr lay
ldx index
inx
cpx msgX
bcc :loop
beq :loop
]rts rts
*-------------------------------
*
* S E T B G I M A G E
*
* In: IMAGE = coded image #
* Out: BANK, TABLE, IMAGE set for hires call
*
* Protect A,X
*
*-------------------------------
setbgimg
tay
lda #3 ;auxmem
sta BANK
lda #0
sta TABLE
lda IMAGE ;Bit 7: 0 = bgtable1, 1 = bgtable2
bpl :bg1
and #$7f
sta IMAGE
lda #>bgtable2
bne :ok
:bg1 lda #>bgtable1
:ok sta TABLE+1
tya
rts
*-------------------------------
*
* S E T C H A R I M A G E
*
* In: TABLE = chtable # (0-7)
* Out: BANK, TABLE set for hires call
*
* Protect A,X
*
*-------------------------------
setcharimg
pha
ldy TABLE
lda chtabbank,y
sta BANK
lda #0
sta TABLE
lda chtablist,y
sta TABLE+1
pla
rts
*-------------------------------
*
* D I M C H A R
*
* Get dimensions of character
* (Misc. routine for use by CTRL)
*
* In: A = image #, X = table #
* Out: A = width, X = height
*
*-------------------------------
DIMCHAR
sta IMAGE
stx TABLE
jsr setcharimg
jmp getwidth
*-------------------------------
*
* C V T X
*
* Convert X-coord to byte & offset
* Works for both single & double hires
*
* In: XCO/OFFSET = X-coord (2 bytes)
* Out: XCO/OFFSET = byte/offset
*
* Hires scrn: X-coord range 0-279, byte range 0-39
* Dbl hires scrn: X-coord range 0-559, byte range 0-79
*
* Trashes Y-register
*
* Returns accurate results for all input (-32767 to 32767)
* but wildly offscreen values will slow it down
*
*-------------------------------
]XL = XCO
]XH = OFFSET
range = 36*7 ;largest multiple of 7 under 256
CVTX
lda #0
sta ]temp
lda ]XH
bmi :negative ;X < 0
beq :ok ;0 <= X <= 255
:loop lda ]temp
clc
adc #36
sta ]temp
lda ]XL
sec
sbc #range
sta ]XL
lda ]XH
sbc #0
sta ]XH
bne :loop
:ok ldy ]XL
lda ByteTable,y
clc
adc ]temp
sta XCO
lda OffsetTable,y
sta OFFSET
rts
:negative
lda ]temp
sec
sbc #36
sta ]temp
lda ]XL
clc
adc #range
sta ]XL
lda ]XH
adc #0
sta ]XH
bne :negative
beq :ok
]rts rts
*-------------------------------
*
* Z E R O L I S T S
*
* Zero image lists (except peel lists)
*
*-------------------------------
ZEROLSTS lda #0
sta genCLS
sta wipeX
sta bgX
sta midX
sta objX
sta fgX
sta msgX
rts
*-------------------------------
*
* Zero both peel lists
*
*-------------------------------
ZEROPEELS
lda #0
sta peelX
sta peelX+maxpeel
]rts rts
*-------------------------------
*
* Z E R O P E E L
*
* Zero peel list & buffer for whichever page we're on
*
* (Point PEELBUF to beginning of appropriate peel buffer
* & set #-of-images byte to zero)
*
*-------------------------------
ZEROPEEL
lda #0