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Atari mouse routines -- original version from F.Offenga

git-svn-id: svn://svn.cc65.org/cc65/trunk@441 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cpg 2000-11-17 01:23:44 +00:00
parent df52e29196
commit 2326ca6274

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libsrc/atari/mouse.s Normal file
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;--------------------------------------------------------------------
; Atari 8-bit mouse routines -- 05/07/2000 Freddy Offenga
;
; The following devices are supported:
; - Atari trak-ball
; - ST mouse
; - Amiga mouse
;
; Mouse checks are done in the timer 1 IRQ and the mouse arrow is
; drawn in player 0 during the vertical blank
;--------------------------------------------------------------------
.export _mouse_init, _mouse_done, _mouse_box
.export _mouse_show, _mouse_hide, _mouse_move
.export _mouse_down
.import popa
.include "atari.inc"
TRAK_BALL = 0 ; device Atari trak-ball
ST_MOUSE = 1 ; device ST mouse
AMIGA_MOUSE = 2 ; device Amiga mouse
MAX_TYPE = 3 ; first illegal device type
defxmin = 48 ; default x minimum
defymin = 32 ; default y minimum
defxmax = 204 ; default x maximum
defymax = 211 ; default y maximum
pmsize = 16 ; size pm shape
xinit = 100 ; init. x pos.
yinit = 100 ; init. y pos.
pmb = $2800 ; pm base memory
pm0 = pmb+$400 ; pm 0 memory
;--------------------------------------------------------------------
; Initialize mouse routines
; int mouse_init(unsigned char type, unsigned char port)
_mouse_init:
ldy #0
sta (SAVMSC),y
sta port_nr
jsr popa
ldy #1
sta (SAVMSC),y
sta mouse_type
ldx mouse_type
cpx #MAX_TYPE
bcc setup
ifail:
lda #0 ; init. failed
tax
rts
setup:
lda lvectab,x
sta mouse_vec+1
lda hvectab,x
sta mouse_vec+2
lda #defxmin
sta xmin
lda #defymin
sta ymin
lda #defxmax
sta xmax
lda #defymax
sta ymax
lda #xinit
sta mousex
lda #yinit
sta mousey
jsr pminit
lda VTIMR1
sta old_t1
lda VTIMR1+1
sta old_t1+1
lda #<t1_vec
sta VTIMR1
lda #>t1_vec
sta VTIMR1+1
lda #%00000001
sta AUDCTL
lda #0
sta AUDC1
lda #15
sta AUDF1
sta STIMER
sei
lda POKMSK
ora #%00000001 ; timer 1 enable
sta POKMSK
sta IRQEN
cli
lda VVBLKI
sta vbi_jmp+1
lda VVBLKI+1
sta vbi_jmp+2
lda #6
ldy #<vbi
ldx #>vbi
jsr SETVBV
lda #$C0
sta NMIEN
ldx #0
lda #1
sta mouse_on
rts
;--------------------------------------------------------------------
; Finish mouse routines
; void mouse_done(void)
_mouse_done:
sei
lda POKMSK
and #%11111110 ; timer 1 disable
sta IRQEN
sta POKMSK
cli
lda old_t1
sta VTIMR1
lda old_t1+1
sta VTIMR1+1
lda #$40
sta NMIEN
lda #6
ldy vbi_jmp+1
ldx vbi_jmp+2
jsr SETVBV
lda #0
sta GRACTL
sta HPOSP0
sta mouse_on
rts
;--------------------------------------------------------------------
; Set mouse limits
; void mouse_box(char xmin, char ymin, char xmax, char ymax)
_mouse_box:
sta ymax
jsr popa
sta xmax
jsr popa
sta ymin
jsr popa
sta xmin
rts
;--------------------------------------------------------------------
; Set mouse position
; void mouse_move(char xpos, char ypos)
_mouse_move:
sta mousey
jsr popa
sta mousex
rts
;--------------------------------------------------------------------
; Show mouse arrow
; void mouse_show(void)
_mouse_show:
lda #1
sta mouse_on
rts
;--------------------------------------------------------------------
; Hide mouse arrow
; void mouse_hide(void)
_mouse_hide:
lda #0
sta mouse_on
rts
;--------------------------------------------------------------------
; Ask mouse button
; int mouse_down(void)
_mouse_down:
ldx port_nr
lda STRIG0,x
bne nobut
lda #14
sta COLOR1
ldx #0
lda #1
rts
nobut: ldx #0
txa
rts
;--------------------------------------------------------------------
; Atari trak-ball check, A,Y = 4-bit port value
trak_check:
eor oldval
and #%00001000
beq horiz
tya
and #%00000100
beq mmup
inc mousey
bne horiz
mmup: dec mousey
horiz: tya
eor oldval
and #%00000010
beq mmexit
tya
and #%00000001
beq mmleft
inc mousex
bne mmexit
mmleft: dec mousex
mmexit: sty oldval
rts
;--------------------------------------------------------------------
; ST mouse check, A,Y = 4-bit port value
st_check:
and #%00000011
ora dumx
tax
lda sttab,x
bmi nxst
beq xist
dec mousex ; 1 = left
bne nxst
xist: inc mousex ; 0 = right
nxst: tya
and #%00001100
ora dumy
tax
lda sttab,x
bmi nyst
bne yst
dec mousey ; 0 = up
bne nyst
yst: inc mousey ; 1 = down
; store old readings
nyst: tya
and #%00000011
asl
asl
sta dumx
tya
and #%00001100
lsr
lsr
sta dumy
rts
;--------------------------------------------------------------------
; Amiga mouse check, A,Y = 4-bit port value
amiga_check:
lsr
and #%00000101
ora dumx
tax
lda amitab,x
bmi nxami
bne xiami
dec mousex ; 0 = left
bne nxami
xiami: inc mousex ; 1 = right
nxami: tya
and #%00000101
ora dumy
tax
lda amitab,x
bmi nyami
bne yiami
dec mousey ; 0 = up
bne nyami
yiami: inc mousey ; 1 = down
; store old readings
nyami: tya
and #%00001010
sta dumx
tya
and #%00000101
asl
sta dumy
rts
;--------------------------------------------------------------------
; timer 1 IRQ routine - check mouse
t1_vec: tya
pha
txa
pha
lda RANDOM
sta COLBK ; debug
lda port_nr
lsr ; even number 0/2
tay
lda PORTA,y
ldy port_nr
cpy #1
beq oddp
cpy #3
beq oddp
lsr
lsr
lsr
lsr
oddp: tay
mouse_vec:
jsr st_check ; will be modified
pla
tax
pla
tay
pla
rti
;--------------------------------------------------------------------
; VBI - check mouse limits and display mouse arrow
vbi: lda mousex
cmp xmin
bcs ok1 ; xmin <= mousex
lda xmin
sta mousex
ok1: lda mousey
cmp ymin
bcs ok2 ; ymin <= mousey
lda ymin
sta mousey
ok2: lda xmax
cmp mousex
bcs ok3 ; xmax >= mousex
lda xmax
sta mousex
ok3: lda ymax
cmp mousey
bcs ok4 ; ymax >= mousey
lda ymax
sta mousey
ok4: jsr clrpm
lda mouse_on
bne mon
lda #0
sta HPOSP0
beq moff
mon: jsr drwpm
lda mousey
sta omy
lda #3
moff: sta GRACTL
vbi_jmp:
jmp SYSVBV ; will be modified
;--------------------------------------------------------------------
; initialize mouse pm
pminit: ldx #0
txa
clpm: sta pm0,x
inx
bne clpm
lda #>pmb
sta PMBASE
lda #62
sta SDMCTL
lda #1
sta GPRIOR
lda #0
sta PCOLR0
sta SIZEP0
rts
;--------------------------------------------------------------------
; draw new mouse pm
drwpm: lda mousex
sta HPOSP0
lda mousey
tax
ldy #0
fmp2: lda mskpm,y
sta pm0,x
inx
iny
cpy #pmsize
bne fmp2
rts
;--------------------------------------------------------------------
; clear old mouse pm
clrpm: lda omy
tax
ldy #0
tya
fmp1: sta pm0,x
inx
iny
cpy #pmsize
bne fmp1
rts
;--------------------------------------------------------------------
.data
; mouse arrow - pm shape
mskpm: .byte %00000000
.byte %10000000
.byte %11000000
.byte %11000000
.byte %11100000
.byte %11100000
.byte %11110000
.byte %11100000
.byte %11100000
.byte %00100000
.byte %00100000
.byte %00110000
.byte %00110000
.byte %00000000
.byte %00000000
.byte %00000000
; ST mouse lookup table
sttab: .byte $FF,$01,$00,$01
.byte $00,$FF,$00,$01
.byte $01,$00,$FF,$00
.byte $01,$00,$01,$FF
; Amiga mouse lookup table
amitab: .byte $FF,$01,$00,$FF
.byte $00,$FF,$FF,$01
.byte $01,$FF,$FF,$00
.byte $FF,$00,$01,$FF
; Device vectors
lvectab:
.byte <trak_check, <st_check, <amiga_check
hvectab:
.byte >trak_check, >st_check, >amiga_check
; Misc. vars
old_t1: .res 2
dumx: .res 1
dumy: .res 1
oldval: .res 1
omy: .res 1
mousex: .res 1
mousey: .res 1
xmin: .res 1
ymin: .res 1
xmax: .res 1
ymax: .res 1
mouse_on:
.res 1
mouse_type:
.res 1
port_nr:
.res 1