mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-01-03 18:29:53 +00:00
329 lines
5.9 KiB
ArmAsm
329 lines
5.9 KiB
ArmAsm
; bubble universe -- Apple II Hires
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; even more size optimized version
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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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; 534 bytes -- original tiny version
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; 529 bytes -- back out self modifying U/V code (allows more compact tables)
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; 492 bytes -- hook up compact sine generation
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; 445 bytes -- strip out keyboard code
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; 208 bytes -- use ROM routines
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; 200 bytes -- optimize page flip
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; 226 bytes -- don't have room to over-write with sine table
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; 240 bytes -- use custom, faster, clear screen
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; 237 bytes -- remove redundant HGR
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; 217 bytes -- update to not over-write code for sine base generation
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; soft-switches
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KEYPRESS = $C000
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KEYRESET = $C010
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PAGE1 = $C054
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PAGE2 = $C055
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; ROM routines
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BKGNDZ = $F3F2 ; clear current page to 0
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BKGND0 = $F3F4 ; clear current page to A
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HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
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HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
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HPLOT0 = $F457 ; plot at (Y,X), (A)
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HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
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; zero page
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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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IT = $DA
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IS = $DB
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HGR_PAGE = $E6
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OUTL = $FC
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OUTH = $FD
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;sines = sines_base-$1A ; overlaps some code
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;sines2 = sines+$100 ; duplicate so we can index cosine into it
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;cosines = sines+$c0
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sines = $6000
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fifty_nines = sines+58
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sines2 = sines+$100
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cosines = sines+$c0
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bubble_rom:
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;=============================
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; reconstruct sine base table
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;=============================
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; first part linear (26 bytes)
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; have to adjust once for doubled $42
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; middle part copied from sine_data (32 bytes)
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; end part all $59 (7 bytes)
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; offset counts down from 31 to 0
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; sines-6,Y = linear
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; sines+26+offset = sines_data+offset
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; sines+58+offset = $59
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ldy #$1F ; offset
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ldx #$48 ; want to write $48 downto $30
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; with $42 doubled
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looper:
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txa
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sta sines-6,Y ;
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lda sines_data,Y
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sta sines+26,Y
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lda #$59 ; also write $59 off the top
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sta fifty_nines,Y
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cpy #$19 ; we could save more bytes if we didn't
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beq skipper ; bother trying to be exact
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dex
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skipper:
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dey
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bpl looper
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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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; 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,X
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; sta sines,X
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sta sines,Y
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lda #$60
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sec
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sbc sines,X
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sta sines+128,X
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sta sines+128,Y
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iny
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dex
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bpl setup_sine_loop
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;=======================
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; init variables
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;=======================
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; wipe all of zero page but $FF
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; in theory we only need to clear/copy $00..$C0
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; but not sure how to use to our advantage
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inx ; X=0
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ldy #0 ; Y=0
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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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sty $D0,X ; clear zero page
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lda sines,X ; duplicate sine table for cosine use
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sta sines2,X
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dex
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bne init_loop
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;=======================
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; init graphics
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jsr HGR2
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ldx #7
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jsr HCOLOR1
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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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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 ; Y should be 0 here?
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sta IS
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i_smc:
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lda #1 ; 40
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sta I
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i_loop:
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j_smc:
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lda #24 ; 200
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sta J
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j_loop:
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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
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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 ; 2
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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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; max value for both $60 so carry not set
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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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;===========================================================
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; HPLOT U+44,V+96
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; U is centered at 96, to get to center of 280 screen add 44
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; U already in A
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adc #44 ; 2
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tax ; 2
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; calculate Ypos
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lda V
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; HPLOT0 -- plot at (Y,X), (A)
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ldy #0
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jsr HPLOT0
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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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flip_pages:
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; flip pages
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; if $20 (draw PAGE1) draw PAGE2, SHOW page1
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; if $40 (draw PAGE2) draw PAGE1, SHOW page2
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lda HGR_PAGE
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eor #$60
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sta HGR_PAGE
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cmp #$40
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bne flip2
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flip1:
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sta PAGE1
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beq done_flip
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flip2:
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sta PAGE2
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done_flip:
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;=======================
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; clear screen
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; note can be ~8192 cycles faster at expense of few bytes
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; if we use self-modifying code instead of indirect-Y
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; lda HGR_PAGE
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sta OUTH
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clear_loop_fix:
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lda #$00 ; set color to black
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tay
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; assume OUTL starts at 0 from clearing earlier
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clear_loop:
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sta (OUTL),Y
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iny
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bne clear_loop
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inc OUTH
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lda OUTH
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and #$1f
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bne clear_loop_fix
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beq next_frame ; bra
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;.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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;.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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; need 26 bytes of destroyable area?
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; alternately, need code to copy 26 bytes
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; 26 bytes to gen
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; 32 bytes of base
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; 7 59s
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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
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;old_sines_base:
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; .byte $42,$43,$44,$45,$46,$47,$48,
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sines_data:
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;sines_base:
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.byte $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
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;fifty_nines:
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; .byte $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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