mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-01 01:06:33 +00:00
366 lines
5.2 KiB
ArmAsm
366 lines
5.2 KiB
ArmAsm
; bubble universe tiny -- Apple II Lores
|
|
|
|
; what if you zoom into a bubble universe and it's full of
|
|
; angry bees
|
|
|
|
; 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
|
|
|
|
; 578 bytes = original color
|
|
; 531 bytes = remove keyboard code
|
|
; 527 bytes = inline sine gen
|
|
; 523 bytes = optimize init a bit
|
|
; 301 bytes = generate color lookup table
|
|
; 297 bytes = optimize color lookup table
|
|
; 282 bytes = optimize color shift
|
|
; 266 bytes = reduce resolution of sine table x2
|
|
; 260 bytes = shave off some bytes with unneeded compares
|
|
; 255 bytes = reoptimize the sine doubler
|
|
; 264 bytes = add sound (urgh)
|
|
; 265 bytes = fix colors
|
|
; 263 bytes = waste a lot of time optimizing color lookup table
|
|
|
|
; soft-switches
|
|
|
|
SPEAKER = $C030
|
|
FULLGR = $C052
|
|
|
|
; ROM routines
|
|
|
|
PLOT = $F800 ;; PLOT AT Y,A
|
|
SETGR = $FB40
|
|
|
|
; zero page
|
|
|
|
COLOR = $30
|
|
|
|
SINES_BASE = $C0
|
|
|
|
I = $D0
|
|
J = $D1
|
|
T = $D7
|
|
U = $D8
|
|
V = $D9
|
|
IT = $DA
|
|
IS = $DB
|
|
|
|
INL = $FC
|
|
INH = $FD
|
|
|
|
sines = $6c00
|
|
sines2 = $6d00
|
|
|
|
; must be page aligned :(
|
|
cosines = $6e00
|
|
cosines2= $6f00
|
|
|
|
color_map = $1000
|
|
|
|
bubble_gr:
|
|
|
|
;=======================
|
|
; init graphics
|
|
;=======================
|
|
|
|
jsr SETGR
|
|
|
|
; can't rely on registers after this as different on IIe
|
|
; with 80 col card
|
|
|
|
bit FULLGR
|
|
|
|
;========================
|
|
; setup lookup tables
|
|
;========================
|
|
|
|
;========================
|
|
; color lookup
|
|
;========================
|
|
; 34 original
|
|
; 30 updated
|
|
; 31 fixed
|
|
; 29 improved
|
|
|
|
|
|
;================
|
|
; current best
|
|
|
|
ldx #0 ; init output pointer ; 2
|
|
first_loop:
|
|
ldy #$ff ; reset current value ; 2
|
|
loop1:
|
|
yloop:
|
|
iny ; 1
|
|
yloop2:
|
|
tya ; 1
|
|
sta color_map,X ; values[y]=a; ; 3
|
|
|
|
iny ; 1
|
|
inx ; 1
|
|
beq done ; 2
|
|
cpx #16 ; 2
|
|
beq first_loop ; 2
|
|
|
|
txa ; 1
|
|
and #$f ; 2
|
|
|
|
beq yloop ; if nextcol==0, skip f->0 ; 2
|
|
|
|
lsr ; 1
|
|
|
|
bne yloop2 ; if nextcol!=1, y=y+1 ; 2
|
|
|
|
dey ; if nextcol==1, repeat y ; 1
|
|
jmp yloop2 ; 3
|
|
|
|
done:
|
|
|
|
; X=0 here
|
|
|
|
;==========================
|
|
; make sine/cosine tables
|
|
;==========================
|
|
|
|
; floor(s*sin((x-96)*PI*2/256.0)+48.5);
|
|
|
|
;===================================
|
|
;
|
|
;
|
|
; 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:
|
|
|
|
; spread sine table
|
|
|
|
; load from sines_base,Y/2
|
|
; store to SINES_BASE,Y
|
|
|
|
; ldx #0 ; set previously
|
|
spread_loop:
|
|
txa
|
|
lsr
|
|
tay
|
|
|
|
lda sines_base,Y
|
|
|
|
sta SINES_BASE,X ; double the output
|
|
inx
|
|
cpx #64
|
|
bne spread_loop
|
|
|
|
|
|
|
|
|
|
; ldx #64
|
|
ldy #64
|
|
setup_sine_loop:
|
|
|
|
lda SINES_BASE,X
|
|
|
|
sta sines,X
|
|
sta sines2,X
|
|
sta sines,Y
|
|
sta sines2,Y
|
|
|
|
lda #$60
|
|
sec
|
|
sbc SINES_BASE,X
|
|
|
|
sta sines+128,X
|
|
sta sines2+128,X
|
|
sta sines+128,Y
|
|
sta sines2+128,Y
|
|
|
|
iny
|
|
dex
|
|
bpl setup_sine_loop
|
|
|
|
; X is $FF here?
|
|
|
|
inx
|
|
|
|
; ldx #0
|
|
|
|
cosine_loop:
|
|
lda sines+192,X
|
|
sta cosines,X
|
|
sta cosines2,X
|
|
inx
|
|
bne cosine_loop
|
|
|
|
; X is 0 here?
|
|
|
|
;=======================
|
|
; init variables
|
|
;=======================
|
|
;
|
|
|
|
; lda #0
|
|
stx U
|
|
stx V
|
|
stx T
|
|
|
|
dex ; Y=$FF (color white)
|
|
stx COLOR
|
|
|
|
;=========================
|
|
;=========================
|
|
; main loop
|
|
;=========================
|
|
;=========================
|
|
|
|
next_frame:
|
|
|
|
; reset I*T
|
|
|
|
lda T
|
|
sta it1_smc+1
|
|
sta IT
|
|
; sta it2_smc+1
|
|
|
|
; reset I*S
|
|
|
|
lda #0
|
|
sta is1_smc+1
|
|
sta IS
|
|
; sta is2_smc+1
|
|
|
|
num1_smc:
|
|
lda #13 ; 13
|
|
sta I
|
|
|
|
i_loop:
|
|
num2_smc:
|
|
lda #$18 ; 24
|
|
|
|
sta J
|
|
j_loop:
|
|
ldx U
|
|
ldy V
|
|
|
|
; where S=41 (approximately 1/6.28)
|
|
|
|
bit SPEAKER ; click speaker
|
|
|
|
clc ; 2
|
|
|
|
; calc: b=i+t+u;
|
|
; u=cosines[a]+cosines[b];
|
|
|
|
lda IS
|
|
adc V
|
|
tay
|
|
lda IT
|
|
adc U
|
|
tax
|
|
;is2_smc:
|
|
lda cosines,Y ; 4+
|
|
|
|
;it2_smc:
|
|
adc cosines,Y ; 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
|
|
|
|
bit SPEAKER ; click speaker
|
|
|
|
;===========================================================
|
|
; original code is centered at 96,96 (on hypothetical 192x192 screen)
|
|
|
|
; we adjust to be 40x48 window centered at 48,48
|
|
|
|
; PLOT U-48,V-48
|
|
|
|
; U already in A
|
|
; sec
|
|
sbc #48
|
|
tay ; 2
|
|
cpy #40
|
|
bcs no_plot
|
|
|
|
; calculate Ypos
|
|
lda V
|
|
; sec
|
|
sbc #48
|
|
cmp #48
|
|
bcs no_plot
|
|
|
|
|
|
bit SPEAKER ; click speaker
|
|
|
|
jsr PLOT ; PLOT AT Y,A
|
|
|
|
no_plot:
|
|
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
|
|
sta IS
|
|
dec I
|
|
bne i_loop
|
|
done_i:
|
|
|
|
; sty V
|
|
inc T
|
|
|
|
end:
|
|
|
|
;=================
|
|
; cycle colors
|
|
|
|
ldy #$0 ; 2
|
|
sty INL ; 2
|
|
lda #4 ; 2
|
|
sta INH ; 2
|
|
cycle_color_loop:
|
|
lda (INL),Y ; 2
|
|
tax ; 1
|
|
lda color_map,X ; 3
|
|
sta (INL),Y ; 2
|
|
|
|
iny ; 1
|
|
bne cycle_color_loop ; 2
|
|
|
|
; need to do this for pages 4-7
|
|
|
|
inc INH ; 2
|
|
lda INH ; 2
|
|
cmp #$8 ; 2
|
|
bne cycle_color_loop ; 2
|
|
; beq next_frame ; bra ; 2
|
|
jmp next_frame
|
|
|
|
|
|
; half as many points
|
|
|
|
sines_base:
|
|
.byte $30,$32,$34,$36,$38,$3A,$3C,$3E
|
|
.byte $40,$42,$43,$45,$47,$48,$4A,$4C
|
|
.byte $4D,$4E,$50,$51,$52,$53,$54,$55
|
|
.byte $56,$57,$57,$58,$58,$59,$59,$59
|
|
.byte $59
|
|
|
|
; floor(s*cos((x-96)*PI*2/256.0)+48.5);
|
|
|