mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-01 01:06:33 +00:00
305 lines
4.3 KiB
ArmAsm
305 lines
4.3 KiB
ArmAsm
; bubble universe -- Apple II Hires
|
|
|
|
; size optimized version, using ROM (slower)
|
|
|
|
; by Vince `deater` Weaver
|
|
|
|
; this version based on fast c64 code by serato_fig
|
|
; as posted to the sizecoding discord
|
|
; based on his TIC-80 variant
|
|
|
|
; originally was working off the BASIC code posted on the pouet forum
|
|
; original effect by yuruyrau on twitter
|
|
|
|
; 534 bytes -- tiny version
|
|
; 250 bytes -- strip out fast clear and hplot code and use ROM
|
|
|
|
; 76d03 cycles = 486659 cycles = 2fps
|
|
|
|
; 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)
|
|
HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
|
|
;COLORTBL = $F6F6
|
|
;WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
|
|
|
|
; zero page
|
|
|
|
GBASL = $26
|
|
GBASH = $27
|
|
|
|
|
|
HPLOTYL = $92
|
|
|
|
I = $D0
|
|
J = $D1
|
|
T = $D7
|
|
U = $D8
|
|
V = $D9
|
|
|
|
HGR_PAGE = $E6
|
|
|
|
INL = $FC
|
|
INH = $FD
|
|
OUTL = $FE
|
|
OUTH = $FF
|
|
|
|
; const
|
|
|
|
;NUM = 32
|
|
;NUM = 24
|
|
|
|
bubble:
|
|
|
|
;========================
|
|
; setup lookup tables
|
|
|
|
; jsr hgr_make_tables
|
|
|
|
; jsr hgr_clear_codegen
|
|
|
|
jsr setup_sine_table
|
|
|
|
;=======================
|
|
; init graphics
|
|
|
|
jsr HGR
|
|
jsr HGR2
|
|
|
|
;=======================
|
|
; init variables
|
|
|
|
; HGR leaves A at 0
|
|
|
|
; lda #0
|
|
sta U
|
|
sta V
|
|
sta T
|
|
|
|
ldx #7
|
|
jsr HCOLOR1
|
|
|
|
;=========================
|
|
;=========================
|
|
; main loop
|
|
;=========================
|
|
;=========================
|
|
|
|
next_frame:
|
|
|
|
; reset I*T
|
|
|
|
lda T
|
|
sta it1_smc+1
|
|
sta it2_smc+1
|
|
|
|
; reset I*S
|
|
|
|
lda #0
|
|
sta is1_smc+1
|
|
sta is2_smc+1
|
|
|
|
num1_smc:
|
|
lda #24 ; 40
|
|
sta I
|
|
|
|
i_loop:
|
|
num2_smc:
|
|
lda #24 ; 200
|
|
|
|
sta J
|
|
j_loop:
|
|
ldx U
|
|
ldy V
|
|
|
|
|
|
; where S=41 (approximately 1/6.28)
|
|
|
|
clc ; 2
|
|
|
|
|
|
|
|
; calc: b=i+t+u;
|
|
; u=cosines[a]+cosines[b];
|
|
is2_smc:
|
|
lda cosines,Y ; 4+
|
|
it2_smc:
|
|
adc cosines,X ; 4+
|
|
sta V
|
|
|
|
; calc: a=i*s+v;
|
|
; u=sines[a]+sines[b];
|
|
is1_smc:
|
|
lda sines,Y ; 4+
|
|
it1_smc:
|
|
adc sines,X ; 4+
|
|
sta U ; 3
|
|
|
|
;===========================================================
|
|
; HPLOT U+44,V+96
|
|
; U is centered at 96, to get to center of 280 screen add 44
|
|
|
|
; U already in A
|
|
|
|
adc #44 ; 2
|
|
tax ; 2
|
|
|
|
; calculate Ypos
|
|
lda V
|
|
|
|
;HPLOT0 = $F457 ; plot at (Y,X), (A)
|
|
|
|
ldy #0
|
|
|
|
jsr HPLOT0
|
|
|
|
|
|
dec J
|
|
bne j_loop
|
|
|
|
done_j:
|
|
|
|
lda is1_smc+1
|
|
clc
|
|
adc #41 ; 1/6.28 = 0.16 = 0 0 1 0 1 0 0 0 = 0x28
|
|
sta is1_smc+1
|
|
sta is2_smc+1
|
|
dec I
|
|
bne i_loop
|
|
done_i:
|
|
|
|
; sty V
|
|
inc T
|
|
|
|
end:
|
|
|
|
.if 0
|
|
lda KEYPRESS
|
|
bpl flip_pages
|
|
bit KEYRESET
|
|
; 0110 -> 0100
|
|
and #$5f ; to handle lowercase too...
|
|
|
|
cmp #'A'
|
|
bne check_z
|
|
inc num1_smc+1
|
|
jmp done_keys
|
|
check_z:
|
|
cmp #'Z'
|
|
bne check_j
|
|
dec num1_smc+1
|
|
jmp done_keys
|
|
check_j:
|
|
cmp #'J'
|
|
bne check_m
|
|
inc num2_smc+1
|
|
jmp done_keys
|
|
check_m:
|
|
cmp #'M'
|
|
bne done_keys
|
|
dec num2_smc+1
|
|
.endif
|
|
done_keys:
|
|
|
|
flip_pages:
|
|
; 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
|
|
lda #0
|
|
jsr BKGND0
|
|
; jsr hgr_page2_clearscreen
|
|
jmp next_frame
|
|
flip2:
|
|
bit PAGE2
|
|
lda #0
|
|
jsr BKGND0
|
|
; jsr hgr_page1_clearscreen
|
|
jmp next_frame
|
|
|
|
|
|
; floor(s*sin((x-96)*PI*2/256.0)+48.5);
|
|
|
|
; note: min=7, around 32
|
|
; max=89 ($59), around 160
|
|
; subtract 7, so 0...82? halfway = 41 = $29 + 7 = $30
|
|
; halfway= 6*16 = 96
|
|
|
|
sines = $6c00
|
|
sines2 = $6d00
|
|
cosines = $6e00
|
|
cosines2= $6f00
|
|
|
|
;===================================
|
|
;
|
|
;
|
|
; final_sine[i]=quarter_sine[i]; // 0..64
|
|
; final_sine[128-i]=quarter_sine[i]; // 64..128
|
|
; final_sine[128+i]=0x60-quarter_sine[i]; // 128..192
|
|
; final_sine[256-i]=0x60-quarter_sine[i]; // 192..256
|
|
|
|
setup_sine_table:
|
|
|
|
ldy #64
|
|
ldx #64
|
|
setup_sine_loop:
|
|
|
|
lda sines_base,Y
|
|
sta sines,Y
|
|
sta sines2,Y
|
|
sta sines,X
|
|
sta sines2,X
|
|
|
|
lda #$60
|
|
sec
|
|
sbc sines_base,Y
|
|
|
|
sta sines+128,Y
|
|
sta sines2+128,Y
|
|
sta sines+128,X
|
|
sta sines2+128,X
|
|
|
|
inx
|
|
dey
|
|
bpl setup_sine_loop
|
|
|
|
|
|
ldy #0
|
|
cosine_loop:
|
|
lda sines+192,Y
|
|
sta cosines,Y
|
|
sta cosines2,Y
|
|
iny
|
|
bne cosine_loop
|
|
|
|
rts
|
|
|
|
sines_base:
|
|
.byte $30,$31,$32,$33,$34,$35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$3F
|
|
.byte $40,$41,$42,$42,$43,$44,$45,$46,$47,$48,$48,$49,$4A,$4B,$4C,$4C
|
|
.byte $4D,$4E,$4E,$4F,$50,$50,$51,$52,$52,$53,$53,$54,$54,$55,$55,$55
|
|
.byte $56,$56,$57,$57,$57,$58,$58,$58,$58,$58,$59,$59,$59,$59,$59,$59
|
|
.byte $59
|
|
|
|
; floor(s*cos((x-96)*PI*2/256.0)+48.5);
|
|
|