bubble_gr: try moving back to 64 sine table
This commit is contained in:
Vince Weaver
parent
d360e8e4d6
commit
2ba9e8d5d5
|
|
@ -0,0 +1,350 @@
|
|||
; 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
|
||||
; 259 bytes = undo self modifying code
|
||||
; 247 bytes = remove extra cosine table
|
||||
; 245 bytes = minor fixes
|
||||
; 268 bytes = back to 64 byte lookup
|
||||
; 264 bytes = optimize sine/cosine init
|
||||
; 262 bytes = optimize var init
|
||||
|
||||
; 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
|
||||
IS = $DA
|
||||
IT = $DB
|
||||
|
||||
INL = $FC
|
||||
INH = $FD
|
||||
|
||||
sines = $6c00
|
||||
sines2 = $6d00
|
||||
|
||||
cosines = $6cc0
|
||||
;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
|
||||
|
||||
;=======================
|
||||
; init variables
|
||||
;=======================
|
||||
; actually clear all of $D0-$1D0
|
||||
; (clearing bottom of stack should be harmless?)
|
||||
; only saves a byte
|
||||
|
||||
txa
|
||||
; ldx #$30
|
||||
init_loop:
|
||||
; sta a:$D0,X ; force 16-bit so doesn't wrap
|
||||
; because I guess it's bad to wipe zero page?
|
||||
; maybe it isn't?
|
||||
|
||||
sta $D0,X
|
||||
dex
|
||||
bne init_loop
|
||||
|
||||
; lda #0
|
||||
; stx U
|
||||
; stx V
|
||||
; stx T
|
||||
; stx INL
|
||||
|
||||
; 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:
|
||||
|
||||
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?
|
||||
|
||||
stx COLOR ; $FF (color white)
|
||||
|
||||
|
||||
;=======================
|
||||
; double the sine table
|
||||
; used for cosine
|
||||
|
||||
; ldx #0
|
||||
looper:
|
||||
lda sines,X
|
||||
sta sines2,X
|
||||
dex
|
||||
bne looper
|
||||
|
||||
; X is 0 here?
|
||||
|
||||
|
||||
|
||||
;=========================
|
||||
;=========================
|
||||
; main loop
|
||||
;=========================
|
||||
;=========================
|
||||
|
||||
; in theory Y=0 from previous loop, but not init above?
|
||||
|
||||
next_frame:
|
||||
|
||||
; reset I*T
|
||||
|
||||
lda T
|
||||
sta IT
|
||||
|
||||
; reset I*S
|
||||
|
||||
lda #0
|
||||
sta IS
|
||||
|
||||
lda #13 ; 13
|
||||
sta I
|
||||
|
||||
i_loop:
|
||||
lda #$18 ; 24
|
||||
sta J
|
||||
j_loop:
|
||||
|
||||
bit SPEAKER ; click speaker
|
||||
|
||||
; where S=41 (approximately 1/6.28)
|
||||
; calc: a=i*s+v;
|
||||
; calc: b=i+t+u;
|
||||
; u=sines[a]+sines[b];
|
||||
; v=cosines[a]+cosines[b];
|
||||
|
||||
clc ; 2
|
||||
lda IS
|
||||
adc V
|
||||
tay
|
||||
|
||||
clc
|
||||
lda IT
|
||||
adc U
|
||||
tax
|
||||
|
||||
clc
|
||||
lda cosines,Y ; 4+
|
||||
adc cosines,X ; 4+
|
||||
sta V
|
||||
|
||||
lda sines,Y ; 4+
|
||||
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:
|
||||
clc
|
||||
lda IS
|
||||
adc #41 ; 1/6.28 = 0.16 = 0 0 1 0 1 0 0 0 = 0x28
|
||||
sta IS
|
||||
dec I
|
||||
bne i_loop
|
||||
done_i:
|
||||
inc T
|
||||
|
||||
end:
|
||||
|
||||
;=================
|
||||
; cycle colors
|
||||
|
||||
ldy #$0 ; 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
|
||||
|
||||
|
||||
|
||||
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);
|
||||
|
||||
Loading…
Reference in New Issue