dos33fsprogs/graphics/hgr/bubble_universe/bubble_slow.s
2024-02-16 01:15:15 -05:00

355 lines
4.9 KiB
ArmAsm

; bubble universe -- Apple II Hires
; soft-switches
KEYPRESS = $C000
KEYRESET = $C010
PAGE1 = $C054
PAGE2 = $C055
; ROM routines
BKGND0 = $F3F4 ; clear current page to A
HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
HPLOT0 = $F457 ; plot at (Y,X), (A)
HLINRL = $F530 ; line to (X,A), (Y)
HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
COLORTBL = $F6F6
WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
; zero page
HPLOTXL = $90
HPLOTXH = $91
HPLOTYL = $92
HPLOTYH = $93
IVL = $94
IVH = $95
RXL = $96
RXH = $97
OUT1L = $98
OUT1H = $99
OUT2L = $9A
OUT2H = $9B
STEMP1L = $9C
STEMP1H = $9D
STEMP2L = $9E
STEMP2H = $9F
I = $D0
J = $D1
XL = $D4
XH = $D5
VL = $D6
VH = $D7
TL = $DA
TH = $DB
UL = $DC
UH = $DD
HGR_PAGE = $E6
; const
NUM = 32
bubble:
jsr HGR2
ldx #7
jsr HCOLOR1
lda #0
sta XL
sta XH
sta VL
sta VH
sta TL
sta TH
next_frame:
lda #0
jsr BKGND0
main_loop:
ldx #0
stx I
outer_loop:
ldx #0
stx J
inner_loop:
; fixed_add(rh[i],rl[i],xh,xl,&rxh,&rxl);
; note: rh is always 0
ldx I ; 3
clc ; 2
lda rl,X
adc XL ; 3
sta RXL ; 3
lda #0 ; 2
adc XH ; 3
sta RXH ; 3
; fixed_add(i,0,vh,vl,&ivh,&ivl);
clc
lda #0
adc VL
sta IVL
lda I
adc VH
sta IVH
; U=SIN(I+V)+SIN(RR+X)
; float_to_fixed(sin(ivh,ivl) + sin(rxh,rxl), &uh,&ul);
ldy #0
jsr sin
ldy #2
jsr sin
clc
lda OUT1L
adc OUT2L
sta UL
lda OUT1H
adc OUT2H
sta UH
; V=COS(I+V)+COS(RR+X)
; float_to_fixed(cos(ivh,ivl) + cos(rxh,rxl), &vh,&vl);
ldy #0
jsr cos
ldy #2
jsr cos
clc
lda OUT1L
adc OUT2L
sta VL
lda OUT1H
adc OUT2H
sta VH
; X=U+T
; fixed_add(uh,ul,th,tl,&xh,&xl);
clc
lda UL
adc TL
sta XL
lda UH
adc TH
sta XH
; HPLOT 32*U+140,32*V+96
; hplot(48*fixed_to_float(uh,ul)+140,
; 48*fixed_to_float(vh,vl)+96);
; HPLOT0 plot at (Y,X), (A)
lda UL
sta HPLOTYL
lda UH
asl HPLOTYL
rol
asl HPLOTYL
rol
asl HPLOTYL
rol
asl HPLOTYL
rol
asl HPLOTYL
rol
clc
adc #140
tax
lda VL
sta HPLOTYL
lda VH
asl HPLOTYL
rol
asl HPLOTYL
rol
asl HPLOTYL
rol
asl HPLOTYL
rol
asl HPLOTYL
rol
clc
adc #96
ldy #0 ; never bigger than 140+48 = 188
; ldx #140
; lda #96
jsr HPLOT0
inc J
lda J
cmp #NUM
beq done_j
jmp inner_loop
done_j:
inc I
lda I
cmp #NUM
beq done_i
jmp outer_loop
done_i:
; t=t+(1.0/32.0);
; 1/2 1/4 1/8 1/16 | 1/32 1/64 1/128 1/256
; $0x08
clc
lda TL
adc #$8
sta TL
lda #0
adc TH
sta TH
end:
; flip pages
; if $20 (draw PAGE1) draw PAGE2, SHOW page1
; if $40 (draw PAGE2) draw PAGE1, SHOW page2
lda HGR_PAGE
eor #$60
sta HGR_PAGE
cmp #$40
bne flip2
flip1:
bit PAGE1
jmp next_frame
flip2:
bit PAGE2
jmp next_frame
;=======================
sin:
; / 6.28 is roughly the same as *0.16
; = .5 .25 .125 .0625 .03125
; 1/6.28 = 0.16 = 0 0 1 0 1 0 0 0 = 0x28
; i=(i*0x28)>>8;
lda IVL,Y
sta STEMP1L
lda IVH,Y
sta STEMP1H
already_loaded:
; i2=i<<3;
asl STEMP1L
rol STEMP1H
asl STEMP1L
rol STEMP1H
asl STEMP1L
rol STEMP1H
; i1=i<<5;
lda STEMP1L
sta STEMP2L
lda STEMP1H
sta STEMP2H
asl STEMP2L
rol STEMP2H
asl STEMP2L
rol STEMP2H
; i=(i1+i2)>>8;
clc
lda STEMP1L
adc STEMP2L
sta STEMP1L
lda STEMP1H
adc STEMP2H
sta STEMP1H
ldx STEMP1H
; sl=fsinh[i];
lda sin_lookup,X
asl
sta OUT1L,Y
bcs sin_negative
sin_positive:
lda #$0
beq set_sin_sign
sin_negative:
lda #$FF
set_sin_sign:
sta OUT1H,Y
rts
;=============================
cos:
; 1.57 is roughly 0x0192 in 8.8
clc
lda IVL,Y
adc #$92
sta STEMP1L
lda IVH,Y
adc #1
sta STEMP1H
jmp already_loaded
rl:
.byte $00,$06,$0C,$12,$19,$1F,$25,$2B
.byte $32,$38,$3E,$45,$4B,$51,$57,$5E
.byte $64,$6A,$71,$77,$7D,$83,$8A,$90
.byte $96,$9D,$A3,$A9,$AF,$B6,$BC,$C2
sin_lookup:
.byte $00,$03,$06,$09,$0C,$0F,$12,$15,$18,$1C,$1F,$22,$25,$28,$2B,$2E
.byte $30,$33,$36,$39,$3C,$3F,$41,$44,$47,$49,$4C,$4E,$51,$53,$55,$58
.byte $5A,$5C,$5E,$60,$62,$64,$66,$68,$6A,$6C,$6D,$6F,$70,$72,$73,$74
.byte $76,$77,$78,$79,$7A,$7B,$7C,$7C,$7D,$7E,$7E,$7F,$7F,$7F,$7F,$7F
.byte $7F,$7F,$7F,$7F,$7F,$7F,$7E,$7E,$7D,$7C,$7C,$7B,$7A,$79,$78,$77
.byte $76,$75,$73,$72,$70,$6F,$6D,$6C,$6A,$68,$66,$64,$63,$61,$5E,$5C
.byte $5A,$58,$56,$53,$51,$4E,$4C,$49,$47,$44,$41,$3F,$3C,$39,$36,$34
.byte $31,$2E,$2B,$28,$25,$22,$1F,$1C,$19,$16,$12,$0F,$0C,$09,$06,$03
.byte $00,$FE,$FA,$F7,$F4,$F1,$EE,$EB,$E8,$E5,$E2,$DF,$DC,$D9,$D6,$D3
.byte $D0,$CD,$CA,$C7,$C4,$C2,$BF,$BC,$BA,$B7,$B4,$B2,$AF,$AD,$AB,$A8
.byte $A6,$A4,$A2,$A0,$9E,$9C,$9A,$98,$96,$95,$93,$91,$90,$8E,$8D,$8C
.byte $8A,$89,$88,$87,$86,$85,$84,$84,$83,$82,$82,$81,$81,$81,$81,$81
.byte $81,$81,$81,$81,$81,$81,$82,$82,$83,$84,$84,$85,$86,$87,$88,$89
.byte $8A,$8B,$8D,$8E,$8F,$91,$93,$94,$96,$98,$99,$9B,$9D,$9F,$A1,$A4
.byte $A6,$A8,$AA,$AD,$AF,$B1,$B4,$B6,$B9,$BC,$BE,$C1,$C4,$C7,$C9,$CC
.byte $CF,$D2,$D5,$D8,$DB,$DE,$E1,$E4,$E7,$EA,$ED,$F0,$F4,$F7,$FA,$FD