304 lines
5.3 KiB
ArmAsm
304 lines
5.3 KiB
ArmAsm
|
|
HGR_SHAPE = $1A
|
|
HGR_SHAPE_H = $1B
|
|
HGR_BITS = $1C
|
|
HGR_COUNT = $1D
|
|
|
|
HMASK = $30
|
|
|
|
DSCTMP = $9D
|
|
|
|
HGR_DX = $D0
|
|
HGR_DX_H = $D1
|
|
HGR_DY = $D2
|
|
HGR_QUADRANT = $D3
|
|
HGR_E = $D4
|
|
HGR_E_H = $D5
|
|
HGR_X = $E0
|
|
HGR_X_H = $E1
|
|
HGR_Y = $E2
|
|
;HGR_COLOR = $E4
|
|
HGR_HORIZ = $E5
|
|
HGR_PAGE = $E6
|
|
|
|
|
|
TXTCLR = $C050
|
|
MIXSET = $C053
|
|
LOWSCR = $C054
|
|
MIXCLR = $C052
|
|
HISCR = $C055
|
|
|
|
|
|
;.align $100
|
|
|
|
.assert >hgr = >hgr_after, error, "hgr crosses page"
|
|
|
|
;==========================
|
|
; HGR
|
|
;==========================
|
|
hgr:
|
|
; F3E2
|
|
lda #$20 ; HIRES Page 1 at $2000
|
|
bit LOWSCR ; BIT SW.LOWSCR Use PAGE1 ($C054)
|
|
; bit MIXSET ; BIT SW.MIXSET (Mixed text)
|
|
sethpg:
|
|
; F3EA
|
|
sta HGR_PAGE
|
|
; lda HIRES
|
|
; lda TXTCLR
|
|
hclr:
|
|
lda #0 ; black background
|
|
sta HGR_BITS
|
|
bkgnd:
|
|
; F3F6
|
|
lda HGR_PAGE
|
|
sta HGR_SHAPE+1
|
|
ldy #0
|
|
sty HGR_SHAPE
|
|
bkgnd_loop:
|
|
lda HGR_BITS
|
|
|
|
sta (HGR_SHAPE),y
|
|
|
|
jsr color_shift
|
|
|
|
iny
|
|
bne bkgnd_loop
|
|
|
|
inc HGR_SHAPE+1
|
|
lda HGR_SHAPE+1
|
|
and #$1f ; see if $40 or $60
|
|
bne bkgnd_loop
|
|
rts
|
|
hgr_after:
|
|
|
|
|
|
.assert >msktbl = >msktbl_after, error, "msktbl crosses page"
|
|
|
|
msktbl: .byte $81,$82,$84,$88,$90,$A0,$C0 ; original
|
|
msktbl_after:
|
|
|
|
.align $100
|
|
|
|
|
|
.assert >hposn = >hposn_after, error, "hposn crosses page"
|
|
|
|
;====================================================
|
|
; HPOSN
|
|
; time = 9 + 61 + 31 + 22 + 42 + 22 + 23 = 210
|
|
|
|
hposn:
|
|
; F411: move values into expected zp locations
|
|
sta HGR_Y ; 3
|
|
stx HGR_X ; 3
|
|
sty HGR_X+1 ; 3
|
|
;===========
|
|
; 9
|
|
|
|
; calc y-position addr. no lookup table?
|
|
pha ; 3
|
|
and #$C0 ; 2
|
|
sta GBASL ; 3
|
|
lsr ; 2
|
|
lsr ; 2
|
|
ora GBASL ; 3
|
|
sta GBASL ; 3
|
|
pla ; 4
|
|
sta GBASH ; 3
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
rol GBASH ; 5
|
|
asl ; 2
|
|
rol GBASH ; 5
|
|
asl ; 2
|
|
ror GBASL ; 5
|
|
lda GBASH ; 3
|
|
and #$1f ; 2
|
|
ora HGR_PAGE ; 3
|
|
sta GBASH ; 3
|
|
;============
|
|
; 61
|
|
; F438
|
|
; divide/mod 16-bit x poisition by 7
|
|
; incoming, X=(y,x)
|
|
; outgoing y=q, a=r
|
|
|
|
; Divide by 7 (From December '84 Apple Assembly Line)
|
|
|
|
txa ; 2
|
|
clc ; 2
|
|
sta HGR_HORIZ ; 3
|
|
lsr ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
adc HGR_HORIZ ; 3
|
|
ror ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
adc HGR_HORIZ ; 3
|
|
ror ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
; x/7 is in A
|
|
;============
|
|
; 31
|
|
; calculate remainder
|
|
clc ; 2
|
|
sta HGR_HORIZ ; 3
|
|
asl ; 2
|
|
adc HGR_HORIZ ; 3
|
|
asl ; 2
|
|
adc HGR_HORIZ ; 3
|
|
; HGR_HORIZ=x/7, A=HGR_HORIZ*7
|
|
; calculate remainder by X-(Q*7)
|
|
sec ; 2
|
|
eor #$ff ; 2
|
|
adc HGR_X ; 3
|
|
; A = remainder ;===========
|
|
; 22
|
|
;============================================================================
|
|
|
|
cpy #0 ; 2
|
|
beq done_mod_nop_23 ; 3
|
|
;==========
|
|
; 5
|
|
theres_high:
|
|
; -1
|
|
clc ; 2
|
|
adc #4 ; make remainder match ; 2
|
|
pha ; 3
|
|
lda HGR_HORIZ ; 3
|
|
adc #36 ; 2
|
|
sta HGR_HORIZ ; 3
|
|
pla ; 4
|
|
|
|
cmp #7 ; 2
|
|
bcc done_mod_nop14 ; blt ; 3
|
|
;============
|
|
; 23
|
|
|
|
|
|
; -1
|
|
sec ; 2
|
|
sbc #7 ; 2
|
|
inc HGR_HORIZ ; 5
|
|
ldy HGR_HORIZ ; nop ; 3
|
|
jmp done_mod ; 3
|
|
;============
|
|
; 14
|
|
;===========================
|
|
; Y=HIGH,bcc = 5+23+ 14 = 42
|
|
; Y=HIGH,bcs = 5+23+ 14 = 42
|
|
; Y=LOW = 5 + 14+23 = 42
|
|
|
|
done_mod_nop_23:
|
|
inc HGR_HORIZ,X ; (nop) ; 6
|
|
dec HGR_HORIZ,X ; (nop) ; 6
|
|
ldy HGR_HORIZ ; (nop) ; 3
|
|
ldy HGR_HORIZ ; (nop) ; 3
|
|
ldy HGR_HORIZ ; (nop) ; 3
|
|
nop ; 2
|
|
done_mod_nop14:
|
|
inc HGR_HORIZ,X ; (nop) ; 6
|
|
dec HGR_HORIZ,X ; (nop) ; 6
|
|
nop ; 2
|
|
|
|
done_mod:
|
|
ldy HGR_HORIZ ; 3
|
|
tax ; 2
|
|
lda msktbl,x ; 4+
|
|
|
|
sta HMASK ; 3
|
|
tya ; 2
|
|
lsr ; 2
|
|
lda HGR_COLOR ; 3
|
|
sta HGR_BITS ; 3
|
|
;===========
|
|
; 22
|
|
|
|
bcs color_shift ; 3
|
|
; cs = 3+20
|
|
;-1
|
|
|
|
; need 23 = 2+6+X = 15
|
|
inc HMASK,X ; nop ; 6
|
|
dec HMASK,X ; nop ; 6
|
|
lda HMASK ; nop ; 3
|
|
|
|
|
|
rts ; 6
|
|
;===========
|
|
; 23
|
|
|
|
|
|
;===================================
|
|
; COLOR_SHIFT
|
|
;===================================
|
|
; positive = 7+(7)+6 = 20
|
|
; negative = 7+ 7 +6 = 20
|
|
|
|
color_shift: ; F47E
|
|
asl ; 2
|
|
cmp #$c0 ; 2
|
|
|
|
bpl done_color_shift ; 3
|
|
; -1
|
|
lda HGR_BITS ; 3
|
|
eor #$7f ; 2
|
|
sta HGR_BITS ; 3
|
|
rts ; 6
|
|
done_color_shift:
|
|
lda HGR_BITS ; nop ; 3
|
|
nop ; 2
|
|
nop ; 2
|
|
rts ; 6
|
|
|
|
hposn_after:
|
|
|
|
;.align $100
|
|
|
|
.assert >hplot0 = >hplot0_after, error, "hplot0 crosses page"
|
|
|
|
;=====================================
|
|
; HPLOT0
|
|
;=====================================
|
|
; point in (YX),A
|
|
; 244 cycles
|
|
hplot0:
|
|
; F457
|
|
jsr hposn ; 6+210
|
|
lda HGR_BITS ; 3
|
|
eor (GBASL),y ; 5+
|
|
and HMASK ; 3
|
|
eor (GBASL),y ; 5+
|
|
sta (GBASL),y ; 6
|
|
rts ; 6
|
|
;============
|
|
; 244
|
|
|
|
|
|
|
|
hplot0_after:
|
|
|
|
.assert >hcolor_equals = >hcolor_equals_after, error, "hce crosses page"
|
|
|
|
;=============================
|
|
; HCOLOR_EQUALS
|
|
;=============================
|
|
; Color in X
|
|
; 13 cycles
|
|
hcolor_equals:
|
|
|
|
; F6E9
|
|
; TODO: mask to be less than 8
|
|
|
|
lda colortbl,x ; 4+
|
|
sta HGR_COLOR ; 3
|
|
rts ; 6
|
|
|
|
colortbl:
|
|
.byte $00,$2A,$55,$7F,$80,$AA,$D5,$FF
|
|
|
|
hcolor_equals_after:
|