bubble_gr: undo some smc

This commit is contained in:
Vince Weaver 2024-05-03 01:51:58 -04:00
parent 5c41d53724
commit 8a39749d2f
2 changed files with 400 additions and 19 deletions

View File

@ -47,6 +47,8 @@ J = $D1
T = $D7
U = $D8
V = $D9
IS = $DA
IT = $DB
INL = $FC
INH = $FD
@ -221,14 +223,16 @@ next_frame:
; reset I*T
lda T
sta it1_smc+1
sta it2_smc+1
; sta it1_smc+1
; sta it2_smc+1
sta IT
; reset I*S
lda #0
sta is1_smc+1
sta is2_smc+1
; sta is1_smc+1
; sta is2_smc+1
sta IS
num1_smc:
lda #13 ; 13
@ -240,31 +244,41 @@ num2_smc:
sta J
j_loop:
ldx U
ldy V
; ldx U
; ldy V
; where S=41 (approximately 1/6.28)
bit SPEAKER ; click speaker
clc ; 2
; calc: a=i*s+v;
; calc: b=i+t+u;
; u=cosines[a]+cosines[b];
is2_smc:
; 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+
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
bit SPEAKER ; click speaker
;===========================================================
@ -299,11 +313,13 @@ no_plot:
done_j:
lda is1_smc+1
; lda is1_smc+1
lda IS
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 is1_smc+1
; sta is2_smc+1
sta IS
dec I
bne i_loop
done_i:
@ -335,8 +351,8 @@ cycle_color_loop:
lda INH ; 2
cmp #$8 ; 2
bne cycle_color_loop ; 2
beq next_frame ; bra ; 2
; beq next_frame ; bra ; 2
jmp next_frame
; half as many points

View File

@ -0,0 +1,365 @@
; 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);