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bubble_gr: try moving back to 64 sine table
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Vince Weaver
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350
graphics/gr/bubble_universe/bubble_tiny64.s
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350
graphics/gr/bubble_universe/bubble_tiny64.s
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; bubble universe tiny -- Apple II Lores
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; what if you zoom into a bubble universe and it's full of
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; angry bees
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; by Vince `deater` Weaver
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; this version based on fast c64 code by serato_fig
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; as posted to the sizecoding discord
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; based on his TIC-80 variant
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; originally was working off the BASIC code posted on the pouet forum
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; original effect by yuruyrau on twitter
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; 578 bytes = original color
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; 531 bytes = remove keyboard code
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; 527 bytes = inline sine gen
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; 523 bytes = optimize init a bit
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; 301 bytes = generate color lookup table
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; 297 bytes = optimize color lookup table
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; 282 bytes = optimize color shift
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; 266 bytes = reduce resolution of sine table x2
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; 260 bytes = shave off some bytes with unneeded compares
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; 255 bytes = reoptimize the sine doubler
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; 264 bytes = add sound (urgh)
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; 265 bytes = fix colors
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; 263 bytes = waste a lot of time optimizing color lookup table
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; 259 bytes = undo self modifying code
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; 247 bytes = remove extra cosine table
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; 245 bytes = minor fixes
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; 268 bytes = back to 64 byte lookup
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; 264 bytes = optimize sine/cosine init
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; 262 bytes = optimize var init
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; soft-switches
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SPEAKER = $C030
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FULLGR = $C052
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; ROM routines
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PLOT = $F800 ;; PLOT AT Y,A
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SETGR = $FB40
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; zero page
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COLOR = $30
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SINES_BASE = $C0
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I = $D0
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J = $D1
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T = $D7
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U = $D8
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V = $D9
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IS = $DA
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IT = $DB
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INL = $FC
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INH = $FD
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sines = $6c00
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sines2 = $6d00
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cosines = $6cc0
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;cosines2= $6f00
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color_map = $1000
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bubble_gr:
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;=======================
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; init graphics
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;=======================
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jsr SETGR
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; can't rely on registers after this as different on IIe
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; with 80 col card
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bit FULLGR
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;========================
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; setup lookup tables
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;========================
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;========================
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; color lookup
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;========================
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; 34 original
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; 30 updated
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; 31 fixed
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; 29 improved
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;================
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; current best
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ldx #0 ; init output pointer ; 2
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first_loop:
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ldy #$ff ; reset current value ; 2
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loop1:
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yloop:
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iny ; 1
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yloop2:
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tya ; 1
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sta color_map,X ; values[y]=a; ; 3
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iny ; 1
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inx ; 1
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beq done ; 2
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cpx #16 ; 2
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beq first_loop ; 2
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txa ; 1
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and #$f ; 2
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beq yloop ; if nextcol==0, skip f->0 ; 2
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lsr ; 1
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bne yloop2 ; if nextcol!=1, y=y+1 ; 2
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dey ; if nextcol==1, repeat y ; 1
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jmp yloop2 ; 3
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done:
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; X=0 here
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;=======================
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; init variables
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;=======================
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; actually clear all of $D0-$1D0
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; (clearing bottom of stack should be harmless?)
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; only saves a byte
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txa
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; ldx #$30
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init_loop:
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; sta a:$D0,X ; force 16-bit so doesn't wrap
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; because I guess it's bad to wipe zero page?
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; maybe it isn't?
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sta $D0,X
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dex
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bne init_loop
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; lda #0
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; stx U
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; stx V
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; stx T
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; stx INL
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; X = 0 here
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;==========================
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; make sine/cosine tables
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;==========================
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; floor(s*sin((x-96)*PI*2/256.0)+48.5);
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;===================================
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;
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;
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; final_sine[i]=quarter_sine[i]; // 0..64
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; final_sine[128-i]=quarter_sine[i]; // 64..128
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; final_sine[128+i]=0x60-quarter_sine[i]; // 128..192
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; final_sine[256-i]=0x60-quarter_sine[i]; // 192..256
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setup_sine_table:
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ldx #64
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ldy #64
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setup_sine_loop:
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lda sines_base,X
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sta sines,X
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; sta sines2,X
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sta sines,Y
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; sta sines2,Y
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lda #$60
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sec
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sbc sines_base,X
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sta sines+128,X
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; sta sines2+128,X
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sta sines+128,Y
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; sta sines2+128,Y
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iny
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dex
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bpl setup_sine_loop
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; X is $FF here?
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stx COLOR ; $FF (color white)
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;=======================
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; double the sine table
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; used for cosine
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; ldx #0
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looper:
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lda sines,X
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sta sines2,X
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dex
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bne looper
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; X is 0 here?
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;=========================
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;=========================
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; main loop
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;=========================
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;=========================
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; in theory Y=0 from previous loop, but not init above?
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next_frame:
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; reset I*T
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lda T
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sta IT
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; reset I*S
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lda #0
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sta IS
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lda #13 ; 13
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sta I
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i_loop:
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lda #$18 ; 24
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sta J
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j_loop:
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bit SPEAKER ; click speaker
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; where S=41 (approximately 1/6.28)
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; calc: a=i*s+v;
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; calc: b=i+t+u;
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; u=sines[a]+sines[b];
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; v=cosines[a]+cosines[b];
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clc ; 2
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lda IS
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adc V
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tay
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clc
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lda IT
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adc U
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tax
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clc
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lda cosines,Y ; 4+
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adc cosines,X ; 4+
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sta V
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lda sines,Y ; 4+
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adc sines,X ; 4+
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sta U ; 3
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bit SPEAKER ; click speaker
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;===========================================================
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; original code is centered at 96,96 (on hypothetical 192x192 screen)
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; we adjust to be 40x48 window centered at 48,48
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; PLOT U-48,V-48
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; U already in A
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; sec
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sbc #48
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tay ; 2
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cpy #40
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bcs no_plot
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; calculate Ypos
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lda V
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; sec
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sbc #48
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cmp #48
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bcs no_plot
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bit SPEAKER ; click speaker
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jsr PLOT ; PLOT AT Y,A
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no_plot:
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dec J
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bne j_loop
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done_j:
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clc
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lda IS
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adc #41 ; 1/6.28 = 0.16 = 0 0 1 0 1 0 0 0 = 0x28
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sta IS
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dec I
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bne i_loop
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done_i:
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inc T
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end:
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;=================
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; cycle colors
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ldy #$0 ; 2
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lda #4 ; 2
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sta INH ; 2
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cycle_color_loop:
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lda (INL),Y ; 2
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tax ; 1
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lda color_map,X ; 3
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sta (INL),Y ; 2
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iny ; 1
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bne cycle_color_loop ; 2
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; need to do this for pages 4-7
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inc INH ; 2
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lda INH ; 2
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cmp #$8 ; 2
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bne cycle_color_loop ; 2
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beq next_frame ; bra ; 2
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; jmp next_frame
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sines_base:
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.byte $30,$31,$32,$33,$34,$35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$3F
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.byte $40,$41,$42,$42,$43,$44,$45,$46,$47,$48,$48,$49,$4A,$4B,$4C,$4C
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.byte $4D,$4E,$4E,$4F,$50,$50,$51,$52,$52,$53,$53,$54,$54,$55,$55,$55
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.byte $56,$56,$57,$57,$57,$58,$58,$58,$58,$58,$59,$59,$59,$59,$59,$59
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.byte $59
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; floor(s*cos((x-96)*PI*2/256.0)+48.5);
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