515 lines
8.0 KiB
ArmAsm
515 lines
8.0 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 $100
|
|
;==========================
|
|
; HGR2
|
|
;==========================
|
|
hgr2:
|
|
; F3D8
|
|
bit HISCR ; BIT SW.HISCR Use PAGE2 ($C055)
|
|
bit MIXCLR ; BIT SW.MIXCLR
|
|
lda #$40 ; HIRES Page 2 at $4000
|
|
bne sethpg
|
|
;==========================
|
|
; 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
|
|
|
|
|
|
msktbl: .byte $81,$82,$84,$88,$90,$A0,$C0 ; original
|
|
|
|
;====================================================
|
|
; HPOSN
|
|
; time = 9 + 61 + 31 + 22 + 42 + 22 + 23 = 210
|
|
|
|
hposn:
|
|
; F411: move values into expected zp locations
|
|
sta HGR_Y ; 3
|
|
stx HGR_X ; 3
|
|
sty HGR_X+1 ; 3
|
|
;===========
|
|
; 9
|
|
|
|
; calc y-position addr. no lookup table?
|
|
pha ; 3
|
|
and #$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
|
|
|
|
;=====================================
|
|
; 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
|
|
|
|
move_left_or_right:
|
|
; F465
|
|
bpl move_right
|
|
|
|
lda HMASK ; 3
|
|
lsr ; 2
|
|
bcs lr_2
|
|
eor #$c0 ; 2
|
|
lr_1:
|
|
sta HMASK ; 3
|
|
rts ; 6
|
|
|
|
lr_2:
|
|
dey
|
|
bpl lr_3
|
|
ldy #39
|
|
lr_3:
|
|
lda #$c0
|
|
lr_4:
|
|
sta HMASK
|
|
sty HGR_HORIZ
|
|
lda HGR_BITS
|
|
|
|
|
|
;===================================
|
|
; 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
|
|
|
|
|
|
;==============================================================
|
|
|
|
move_right:
|
|
lda HMASK
|
|
asl
|
|
eor #$80
|
|
bmi lr_1
|
|
lda #$81
|
|
iny
|
|
cpy #40
|
|
bcc lr_4
|
|
ldy #0
|
|
bcs lr_4
|
|
|
|
|
|
con_1c: .byte $1c
|
|
con_03: .byte $03
|
|
con_04: .byte $04
|
|
|
|
move_up_or_down:
|
|
; F4D3
|
|
bmi move_down
|
|
|
|
clc
|
|
lda GBASH
|
|
bit con_1c ; CON.1C
|
|
bne mu_5
|
|
asl GBASL
|
|
bcs mu_3
|
|
bit con_03 ; CON.03
|
|
beq mu_1
|
|
adc #$1f
|
|
sec
|
|
bcs mu_4
|
|
; F4Eb
|
|
mu_1:
|
|
adc #$23
|
|
pha ; 3
|
|
lda GBASL
|
|
adc #$b0
|
|
bcs mu_2
|
|
adc #$f0
|
|
; f4f6
|
|
mu_2:
|
|
sta GBASL
|
|
pla
|
|
bcs mu_4
|
|
mu_3:
|
|
adc #$1f
|
|
mu_4:
|
|
ror GBASL
|
|
mu_5:
|
|
adc #$fc
|
|
ud_1:
|
|
sta GBASH
|
|
rts
|
|
|
|
; f505
|
|
move_down:
|
|
lda GBASH
|
|
adc #$4
|
|
bit con_1c
|
|
bne ud_1
|
|
asl GBASL
|
|
bcc md_2
|
|
adc #$e0
|
|
clc
|
|
bit con_04
|
|
beq md_3;
|
|
lda GBASL
|
|
adc #$50
|
|
eor #$f0
|
|
beq md_1
|
|
eor #$f0
|
|
md_1:
|
|
sta GBASL
|
|
lda HGR_PAGE
|
|
bcc md_3
|
|
md_2:
|
|
adc #$e0
|
|
md_3:
|
|
ror GBASL
|
|
bcc ud_1
|
|
|
|
;===================================
|
|
; HGLIN
|
|
;===================================
|
|
; cycles = 22+
|
|
|
|
hglin:
|
|
|
|
; F53A: calc quadrant
|
|
pha ; 3
|
|
sec ; 2
|
|
sbc HGR_X ; 3
|
|
pha ; 3
|
|
txa ; 2
|
|
sbc HGR_X+1 ; 3
|
|
sta HGR_QUADRANT ; 3
|
|
;===========
|
|
; 22
|
|
|
|
; F544
|
|
bcs hglin_1
|
|
|
|
pla ; 4
|
|
eor #$ff ; 2
|
|
adc #1 ; 2
|
|
pha ; 3
|
|
lda #0 ; 2
|
|
sbc HGR_QUADRANT ; 3
|
|
|
|
; F550
|
|
hglin_1:
|
|
sta HGR_DX+1 ; 3
|
|
sta HGR_E+1 ; 3
|
|
pla ; 4
|
|
sta HGR_DX ; 3
|
|
sta HGR_E ; 3
|
|
pla ; 4
|
|
sta HGR_X ; 3
|
|
stx HGR_X+1 ; 3
|
|
tya ; 2
|
|
clc ; 2
|
|
sbc HGR_Y ; 3
|
|
bcc hglin_2 ; 3
|
|
|
|
eor #$ff ; 2
|
|
adc #$fe ; 2
|
|
hglin_2:
|
|
; F568
|
|
sta HGR_DY ; 3
|
|
sty HGR_Y ; 3
|
|
ror HGR_QUADRANT
|
|
sec ; 2
|
|
sbc HGR_DX ; 3
|
|
tax ; 2
|
|
lda #$ff ; 3
|
|
sbc HGR_DX+1 ; 3
|
|
sta HGR_COUNT ; 3
|
|
ldy HGR_HORIZ ; 3
|
|
bcs movex2 ; always? ; 3
|
|
; f57c
|
|
movex:
|
|
asl ; 2
|
|
jsr move_left_or_right ; 6+?
|
|
sec ; 2
|
|
|
|
; f581
|
|
movex2:
|
|
lda HGR_E ; 3
|
|
adc HGR_DY ; 3
|
|
sta HGR_E ; 3
|
|
lda HGR_E+1 ; 3
|
|
sbc #0 ; 2
|
|
movex2_1:
|
|
sta HGR_E+1 ; 3
|
|
lda (GBASL),y
|
|
eor HGR_BITS ; 3
|
|
and HMASK ; 3
|
|
eor (GBASL),y
|
|
sta (GBASL),y
|
|
inx ; 2
|
|
bne movex2_2
|
|
|
|
inc HGR_COUNT
|
|
beq rts22
|
|
; F59e
|
|
movex2_2:
|
|
lda HGR_QUADRANT ; 3
|
|
bcs movex
|
|
|
|
jsr move_up_or_down ; 6+
|
|
clc ; 2
|
|
lda HGR_E ; 3
|
|
adc HGR_DX ; 3
|
|
sta HGR_E ; 3
|
|
lda HGR_E+1 ; 3
|
|
adc HGR_DX+1 ; 3
|
|
bvc movex2_1 ; 3
|
|
|
|
|
|
;===============================
|
|
; HPLOT_TO
|
|
;===============================
|
|
;
|
|
; cycles = 10 + 6 + X + 6
|
|
hplot_to:
|
|
|
|
; F712: put vars in right location
|
|
sty DSCTMP ; 3
|
|
tay ; 2
|
|
txa ; 2
|
|
ldx DSCTMP ; 3
|
|
;============
|
|
; 10
|
|
|
|
jsr hglin ;6+?
|
|
rts22:
|
|
rts ; 6
|
|
|
|
.align $100
|
|
|
|
;=============================
|
|
; 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
|
|
|