mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-31 21:41:32 +00:00
433 lines
6.5 KiB
ArmAsm
433 lines
6.5 KiB
ArmAsm
; bubble universe -- Apple II Hires
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; original = 612 bytes
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; clear screen:
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; bkgnd0 = $44198 = 278936 cycles = max ~4fps
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; new: $A616 = 42518 = max ~22fps
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; hplot
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; hplot0 = ($14E-$15C) $14E = 334 * 1024 = 342016 = max ~3fps
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; lookup = 46 * 1024 = 47104 = max ~21fps
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; after fast graphics
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; D7E77 = 884343 = 1.1fps
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; DD06E = ?? (made J countdown, why longer?)
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; DB584 = destructive U when plotting
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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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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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HLINRL = $F530 ; line to (X,A), (Y)
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HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
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COLORTBL = $F6F6
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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; zero page
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GBASL = $26
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GBASH = $27
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HPLOTXL = $90
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HPLOTXH = $91
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HPLOTYL = $92
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HPLOTYH = $93
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IVL = $94
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IVH = $95
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RXL = $96
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RXH = $97
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OUT1L = $98
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OUT1H = $99
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OUT2L = $9A
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OUT2H = $9B
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STEMP1L = $9C
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STEMP1H = $9D
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STEMP2L = $9E
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STEMP2H = $9F
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I = $D0
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J = $D1
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XL = $D4
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XH = $D5
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VL = $D6
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VH = $D7
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TL = $DA
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TH = $DB
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UL = $DC
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UH = $DD
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HGR_PAGE = $E6
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; const
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NUM = 32
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bubble:
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;========================
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; setup lookup tables
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jsr hgr_make_tables
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;=======================
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; init graphics
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jsr HGR2
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;=======================
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; init variables
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lda #0
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sta XL
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sta XH
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sta VL
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sta VH
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sta TL
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sta TH
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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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;===========================
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; "fast" clear screen
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; inline to save 12 cycles
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jsr hgr_clear_screen
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ldx #0 ; 2
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stx I ; 3
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outer_loop:
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; setup R*I to inner loop
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; save NUM*4 (128) cycles at expense of 11 cycles
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ldx I ; 3
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lda rl,X ; 4
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sta rl_smc+1 ; 4
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ldx #NUM ; 2
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stx J ; 3
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inner_loop:
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; fixed_add(rh[i],rl[i],xh,xl,&rxh,&rxl);
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; note: rh is always 0
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; pre-calc (R*I)+X for later use
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clc ; 2
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rl_smc:
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lda #0 ; R*I ; 2
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adc XL ; 3
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sta RXL ; 3
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lda #0 ; 2
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adc XH ; 3
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sta RXH ; 3
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; fixed_add(i,0,vh,vl,&ivh,&ivl);
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; precalc I+V for later use
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; this is 8.8 fixed point so bottom byte of I is 0
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; clc ; C should be 0 from prev ;
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lda VL ; 3
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sta IVL ; 3
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lda I ; 3
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adc VH ; 3
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sta IVH ; 3
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; U=SIN(I+V)+SIN(RR+X)
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ldy #0
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jsr sin
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ldy #2
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jsr sin
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clc
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lda OUT1L
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adc OUT2L
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sta UL
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lda OUT1H
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adc OUT2H
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sta UH
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; V=COS(I+V)+COS(RR+X)
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ldy #0
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jsr cos
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ldy #2
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jsr cos
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clc
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lda OUT1L
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adc OUT2L
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sta VL
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lda OUT1H
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adc OUT2H
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sta VH
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; X=U+T
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clc ; 2
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lda UL ; 3
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adc TL ; 3
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sta XL ; 3
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lda UH ; 3
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adc TH ; 3
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sta XH ; 3
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; HPLOT 32*U+140,32*V+96
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; U can be destroyed as we don't use it again?
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; 01234567 89ABCDEF
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; 56789ABC DEF00000
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; we want 56789ABC, rotate right by 3 is two iterations faster?
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; lda UL
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; sta HPLOTYL
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lda UL ; 3
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lsr UH ; 5
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ror ; 2
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lsr UH ; 5
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ror ; 2
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lsr UH ; 5
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ror ; 2
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.if 0
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lda UH
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asl UL
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rol
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asl UL
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rol
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asl UL
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rol
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asl UL
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rol
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asl UL
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rol
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.endif
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clc
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adc #140
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tax
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lda VL
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sta HPLOTYL
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lda VH
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asl HPLOTYL
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rol
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asl HPLOTYL
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rol
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asl HPLOTYL
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rol
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asl HPLOTYL
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rol
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asl HPLOTYL
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rol
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clc
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adc #96
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; "fast" hplot, Xpos in X, Ypos in A
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tay ; 2
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lda hposn_low,Y ; 4
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sta GBASL ; 3
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clc ; 2
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lda hposn_high,Y ; 4
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adc HGR_PAGE ; 3
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sta GBASH ; 3
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; 21
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ldy div7_table,X ; 4
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lda mod7_table,X ; 4
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tax ; 2
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; 31
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lda (GBASL),Y ; 5
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ora log_lookup,X ; 4
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sta (GBASL),Y ; 6
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; 46
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dec J ; 5
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bmi done_j ; 2/3
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jmp inner_loop ; 3
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; bpl inner_loop
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done_j:
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inc I
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lda I
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cmp #NUM
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beq done_i
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jmp outer_loop
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done_i:
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; t=t+(1.0/32.0);
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; 1/2 1/4 1/8 1/16 | 1/32 1/64 1/128 1/256
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; $0x08
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clc
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lda TL
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adc #$8
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sta TL
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lda #0
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adc TH
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sta TH
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end:
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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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bit PAGE1
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jmp next_frame
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flip2:
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bit PAGE2
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jmp next_frame
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;=======================
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sin:
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; / 6.28 is roughly the same as *0.16
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; = .5 .25 .125 .0625 .03125
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; 1/6.28 = 0.16 = 0 0 1 0 1 0 0 0 = 0x28
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; i=(i*0x28)>>8;
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lda IVL,Y
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sta STEMP1L
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lda IVH,Y
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sta STEMP1H
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already_loaded:
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; i2=i<<3;
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asl STEMP1L
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rol STEMP1H
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asl STEMP1L
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rol STEMP1H
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asl STEMP1L
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rol STEMP1H
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; i1=i<<5;
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lda STEMP1L
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sta STEMP2L
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lda STEMP1H
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sta STEMP2H
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asl STEMP2L
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rol STEMP2H
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asl STEMP2L
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rol STEMP2H
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; i=(i1+i2)>>8;
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clc
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lda STEMP1L
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adc STEMP2L
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sta STEMP1L
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lda STEMP1H
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adc STEMP2H
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sta STEMP1H
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ldx STEMP1H
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; sl=fsinh[i];
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lda sin_lookup,X
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asl
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sta OUT1L,Y
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bcs sin_negative
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sin_positive:
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lda #$0
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beq set_sin_sign
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sin_negative:
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lda #$FF
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set_sin_sign:
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sta OUT1H,Y
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rts
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;=============================
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cos:
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; 1.57 is roughly 0x0192 in 8.8
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clc
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lda IVL,Y
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adc #$92
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sta STEMP1L
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lda IVH,Y
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adc #1
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sta STEMP1H
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jmp already_loaded
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rl:
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.byte $00,$06,$0C,$12,$19,$1F,$25,$2B
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.byte $32,$38,$3E,$45,$4B,$51,$57,$5E
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.byte $64,$6A,$71,$77,$7D,$83,$8A,$90
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.byte $96,$9D,$A3,$A9,$AF,$B6,$BC,$C2
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sin_lookup:
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.byte $00,$03,$06,$09,$0C,$0F,$12,$15,$18,$1C,$1F,$22,$25,$28,$2B,$2E
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.byte $30,$33,$36,$39,$3C,$3F,$41,$44,$47,$49,$4C,$4E,$51,$53,$55,$58
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.byte $5A,$5C,$5E,$60,$62,$64,$66,$68,$6A,$6C,$6D,$6F,$70,$72,$73,$74
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.byte $76,$77,$78,$79,$7A,$7B,$7C,$7C,$7D,$7E,$7E,$7F,$7F,$7F,$7F,$7F
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.byte $7F,$7F,$7F,$7F,$7F,$7F,$7E,$7E,$7D,$7C,$7C,$7B,$7A,$79,$78,$77
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.byte $76,$75,$73,$72,$70,$6F,$6D,$6C,$6A,$68,$66,$64,$63,$61,$5E,$5C
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.byte $5A,$58,$56,$53,$51,$4E,$4C,$49,$47,$44,$41,$3F,$3C,$39,$36,$34
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.byte $31,$2E,$2B,$28,$25,$22,$1F,$1C,$19,$16,$12,$0F,$0C,$09,$06,$03
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.byte $00,$FE,$FA,$F7,$F4,$F1,$EE,$EB,$E8,$E5,$E2,$DF,$DC,$D9,$D6,$D3
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.byte $D0,$CD,$CA,$C7,$C4,$C2,$BF,$BC,$BA,$B7,$B4,$B2,$AF,$AD,$AB,$A8
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.byte $A6,$A4,$A2,$A0,$9E,$9C,$9A,$98,$96,$95,$93,$91,$90,$8E,$8D,$8C
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.byte $8A,$89,$88,$87,$86,$85,$84,$84,$83,$82,$82,$81,$81,$81,$81,$81
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.byte $81,$81,$81,$81,$81,$81,$82,$82,$83,$84,$84,$85,$86,$87,$88,$89
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.byte $8A,$8B,$8D,$8E,$8F,$91,$93,$94,$96,$98,$99,$9B,$9D,$9F,$A1,$A4
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.byte $A6,$A8,$AA,$AD,$AF,$B1,$B4,$B6,$B9,$BC,$BE,$C1,$C4,$C7,$C9,$CC
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.byte $CF,$D2,$D5,$D8,$DB,$DE,$E1,$E4,$E7,$EA,$ED,$F0,$F4,$F7,$FA,$FD
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log_lookup:
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.byte $81,$82,$84,$88,$90,$A0,$C0,$80
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.include "hgr_clear_screen.s"
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.include "hgr_table.s"
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