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4cade/src/fx.lib.a

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factor out some common FX routines, also move font data to D100/LC1
2024-05-26 17:41:21 +00:00
;license:MIT
;(c) 2024 by 4am
;
; common routines used by graphic effects
;
; Note: launcher code can call these routines directly. However,
; graphic effects are assembled as separate targets and must call
; these routines indirectly via the vectors defined in constants.a,
; e.g. iBuildHGRTables instead of BuildHGRTables.
;
; based on routine by John Brooks
; posted on comp.sys.apple2 on 2018-07-11
; https://groups.google.com/d/msg/comp.sys.apple2/v2HOfHOmeNQ/zD76fJg_BAAJ
BuildHGRTables
; out: populates tables at $0201 (hgrlo) and $0301 (hgrhi)
; A clobbered
; X=$C0 (important! some callers rely on this)
; Z=1
; Y preserved
ldx #0
- txa
and #$F8
bpl +
ora #5
+ asl
bpl +
ora #5
+ asl
asl
sta hgrlo, x
txa
and #7
rol
asl hgrlo, x
rol
ora #$20
sta hgrhi, x
inx
cpx #$C0
bne -
rts
WaitForKeyWithTimeout
; in: A = timeout length (like standard $FCA8 wait routine)
; out: A clobbered (not always 0 if key is pressed, but also not the key pressed)
; X/Y preserved
sec
@wait1 pha
@wait2 sbc #1
bne @wait2
pla
bit KBD
bmi @exit
sbc #1
bne @wait1
@exit rts
ReverseCoordinates1Bit
ldy #0 ; <Coordinates1Bit
sty $f0
lda #>Coordinates1Bit
sta $f1
lda #<(EndCoordinates1Bit - 2)
sta $f2
lda #>(EndCoordinates1Bit - 2)
sta $f3
clc
!byte $24
- sec
-- lda ($f0), y
pha
lda ($f2), y
sta ($f0), y
pla
sta ($f2), y
iny
bcc -
ldy #0
!byte $24
- clc
inc $f0
bne +
inc $f1
+ lda $f1
eor #>(Coordinates1Bit + $1A40)
bne +
lda $f0
eor #<(Coordinates1Bit + $1A40)
beq ++
+ lda $f2
bne +
dec $f3
+ dec $f2
bcs -
bcc -- ; always
++ rts
!zone {
RippleCoordinates1Bit4
lda #<aslmod4
+HIDE_NEXT_2_BYTES
RippleCoordinates1Bit3
lda #<aslmod3
+HIDE_NEXT_2_BYTES
RippleCoordinates1Bit2
lda #<aslmod2
+HIDE_NEXT_2_BYTES
RippleCoordinates1Bit
lda #<aslmod
sta @jsr+1
lda #2 ; <(Coordinates1Bit + 2)
sta $f0
ldy #0
sty $f1
lda #$16 ; <(Coordinates1Bit + 22)
sta $f2
sty $f3
lda #$1f
sta $ee
lda #$0d
sta $ef
lda Coordinates1Bit + 2
sta $e0
lda Coordinates1Bit + 3
sta $e1
lda Coordinates1Bit + 22
sta $e2
lda Coordinates1Bit + 23
sta $e3
--- ldx #4
-- ldy $ee, x
lda $ef, x
@jsr jsr aslmod ; SMC on entry
sty $ee, x
sta $ef, x
sty $ec
clc
adc #>Coordinates1Bit
sta $ed
ldy #0
!byte $24
- sec
lda ($ec), y
pha
lda $de, x
sta ($ec), y
pla
sta $de, x
inx
iny
bcc -
dex
dex
dex
dex
bne --
dec $ee
bne ---
dec $ef
bpl ---
bmi exit ; always branches
aslmod4 jsr aslmod
aslmod3 jsr aslmod
aslmod2 jsr aslmod
aslmod cmp #$1A
!if (>aslmod != >aslmod4) {
!serious "aslmod entry points are not on the same page"
}
bcc +
bne ++
cpy #$40
bcc +
++ iny
+ pha
tya
asl
tay
pla
rol
cmp #$34
bcc exit
bne ++
cpy #$80
bcc exit
++ pha
tya
sbc #$80
tay
pla
sbc #$34
exit rts
}
ReverseCoordinates2Bit
ldy #0 ; <Coordinates2Bit
sty $f0
lda #>Coordinates2Bit
sta $f1
lda #<(EndCoordinates2Bit - 2)
sta $f2
lda #>(EndCoordinates2Bit - 2)
sta $f3
ldx #$1E ; #$3C/2
clc
!byte $24
- sec
-- lda ($f0), y
pha
lda ($f2), y
sta ($f0), y
pla
sta ($f2), y
iny
bcc -
ldy #0
!byte $24
- clc
inc $f0
bne +
inc $f1
dex
beq ++
+ lda $f2
bne +
dec $f3
+ dec $f2
bcs -
bcc -- ; always branches
++ rts
RippleCoordinates2Bit
ldy #0
ldx #$33
- lda @ptrtbl, x
sta $c0, x
dex
bpl -
lda #$9b
sta $fe
iny
sty $ff
ldx #6
- lda Coordinates2Bit + 1, x
sta $7f, x
lda Coordinates2Bit + 9, x
sta $85, x
lda Coordinates2Bit + 17, x
sta $8b, x
lda Coordinates2Bit + 65, x
sta $9b, x
dex
bne -
lda Coordinates2Bit + 28
sta $92
lda Coordinates2Bit + 29
sta $93
ldx #4
- lda Coordinates2Bit + 33, x
sta $93, x
lda Coordinates2Bit + 41, x
sta $97, x
lda Coordinates2Bit + 83, x
sta $a1, x
dex
bne -
ldx #2
- lda Coordinates2Bit + 125, x
sta $a5, x
lda Coordinates2Bit + 131, x
sta $a7, x
lda Coordinates2Bit + 139, x
sta $a9, x
lda Coordinates2Bit + 169, x
sta $ab, x
lda Coordinates2Bit + 237, x
sta $ad, x
lda Coordinates2Bit + 2193, x
sta $af, x
lda Coordinates2Bit + 6581, x
sta $b1, x
dex
bne -
--- ldx #$34
-- lda $be, x
tay
ora $bf, x
beq +
lda $bf, x
jsr @aslmod
sty $be, x
sta $bf, x
sty $fc
clc
adc #>Coordinates2Bit
sta $fd
ldy #0
!byte $24
- sec
lda ($fc), y
pha
lda $7e, x
sta ($fc), y
pla
sta $7e, x
inx
iny
bcc -
dex
dex
+ dex
dex
bne --
ldy #1
lda $fe
eor #<(411 - 2)
beq +
ldy #9
eor #<(411 - 2) xor <(411 - 136)
bne ++
+
- ldx @zerotbl, y
sta $0, x
sta $1, x
dey
bpl -
++ dec $fe
bne ---
dec $ff
bpl ---
bmi @exit ; always branches
@aslmod jsr +
+ cmp #$1E
bcc +
iny
+ pha
tya
asl
tay
pla
rol
cmp #$3C
bcc @exit
sbc #$3C
@exit rts
@ptrtbl !word 2, 4, 6, 10, 12, 14, 18, 20
!word 22, 28, 34, 36, 42, 44, 66, 68
!word 70, 84, 86, 126, 132, 140, 170, 238
!word 2194, 6582
@zerotbl !byte $f0, $f2, $ca, $d2, $d8, $e0, $e2, $e6, $ea, $ee
;!macro FX_REVERSE_3BIT {
ReverseCoordinates3Bit
ldy #0 ; <Coordinates3Bit
sty $f0
lda #>Coordinates3Bit
sta $f1
lda #<(EndCoordinates3Bit - 2)
sta $f2
lda #>(EndCoordinates3Bit - 2)
sta $f3
ldx #$28 ; #$50/2
clc
!byte $24
- sec
-- lda ($f0), y
pha
lda ($f2), y
sta ($f0), y
pla
sta ($f2), y
iny
bcc -
ldy #0
!byte $24
- clc
inc $f0
bne +
inc $f1
dex
beq ++
+ lda $f2
bne +
dec $f3
+ dec $f2
bcs -
bcc -- ; always branches
++ rts
;!macro FX_RIPPLE_3BIT {
RippleCoordinates3Bit
ldx #$1B
- lda @ripplezp, x
sta $e0, x
dex
bpl -
--- ldx #$0c
-- ldy $ee, x
lda $ef, x
jsr @aslmod
sty $ee, x
sta $ef, x
sty $ec
clc
adc #>Coordinates3Bit
sta $ed
ldy #0
!byte $24
- sec
lda ($ec), y
pha
lda $de, x
sta ($ec), y
pla
sta $de, x
inx
iny
bcc -
dex
dex
dex
dex
bne --
dec $ee
bne ---
dec $ef
bpl ---
bmi @exit ; always branches
@aslmod jsr +
+ cmp #$28
bcc +
iny
+ pha
tya
asl
tay
pla
rol
cmp #$50
bcc @exit
sbc #$50
@exit rts
@ripplezp
!byte $1F,$F3,$20,$F3,$20,$14,$20,$D3
!byte $1E,$F3,$1F,$54,$00,$00,$AA,$06
!byte $02,$00,$04,$00,$06,$00,$0C,$00
!byte $16,$00,$1A,$00
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