From 2ba9e8d5d5a66ecedd79f7e59648a7a4925bd507 Mon Sep 17 00:00:00 2001 From: Vince Weaver Date: Fri, 3 May 2024 21:31:55 -0400 Subject: [PATCH] bubble_gr: try moving back to 64 sine table --- graphics/gr/bubble_universe/bubble_tiny64.s | 350 ++++++++++++++++++++ 1 file changed, 350 insertions(+) create mode 100644 graphics/gr/bubble_universe/bubble_tiny64.s diff --git a/graphics/gr/bubble_universe/bubble_tiny64.s b/graphics/gr/bubble_universe/bubble_tiny64.s new file mode 100644 index 00000000..494caa36 --- /dev/null +++ b/graphics/gr/bubble_universe/bubble_tiny64.s @@ -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); +