mirror of
https://github.com/deater/dos33fsprogs.git
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292 lines
6.4 KiB
ArmAsm
292 lines
6.4 KiB
ArmAsm
; bubble universe -- Apple II Hires
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; by Vince `deater` Weaver
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; based roughly on the BASIC code posted on the pouet forum
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; original effect by yuruyrau on twitter
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; this version based on fast c64 code
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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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HPLOTYL = $92
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RXL = $96
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RXH = $97
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STEMP1L = $98
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STEMP1H = $99
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STEMP2L = $9A
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IC = $D0
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J = $D1
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XL = $D2
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XH = $D3
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;VL = $D4
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;VH = $D5
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;TL = $D6
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T = $D7
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U = $D8
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V = $D9
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HGR_PAGE = $E6
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; const
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;NUM = 32
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NUM = 24
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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 HGR
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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 U
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sta V
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sta T
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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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.include "hgr_clear_part.s"
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lda T
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sta IT1
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sta IT2
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lda #0
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sta IS1
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sta IS2
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lda #24 ; 40
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sta IC
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ldx U
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ldy V
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i_loop:
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lda #24 ; 200
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sta J
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j_loop:
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clc ; 2
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IS1 = *+1
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lda sin_t,Y ; 4+
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IT1 = *+1
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adc sin_t,X ; 4+
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sta U ; 3
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IS2 = *+1
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lda cos_t,Y ; 4+
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IT2 = *+1
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adc cos_t,X ; 4+
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tay ; 2 = 23-27 cycles
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sty V
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;===========================================================
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; HPLOT 32*U+140,32*V+96
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lda U
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clc ; 2
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adc #140 ; 2
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tax ; 2
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; calculate Ypos
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lda V
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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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; Apple II hi-res is more-or-less 280x192
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; two consecutive pixels on are white
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; single pixels are colored based on palette
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; we treat things as a monochrome display, on a color
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; display odd/even pixels will have different colors
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; The Y memory offset is a horrible interleaved mess, so we use
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; a lookup table we generated at start. We also add in
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; the proper value for page-flipping
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; Apple II hi-res is 7 pixels/byte, so we also pre-generate
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; div and mod by 7 tables at start and use those
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; instead of dividing by 7
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; We cheat and don't worry about the X positions larger
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; than 256 because our algorithm only goes up to 208
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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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; get current 7-bit pixel range, OR in to set new pixel
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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
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bne j_loop
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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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lda IS1
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clc
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adc #41
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sta IS1
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sta IS2
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dec IC
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bne i_loop
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; inc I ; 5
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; lda I ; 3
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; cmp #NUM ; 2
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; beq done_i ; 2/3
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; jmp outer_loop ; 3
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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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; carry always set here as we got here from a BEQ
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; (bcs=bge, bcc=blt)
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; lda tl_smc+1 ; 4
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; adc #$7 ; really 8, carry always set ; 2
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; sta tl_smc+1 ; 4
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; lda #0 ; 2
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; adc th_smc+1 ; 4
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; sta th_smc+1 ; 4
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sty V
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inc T
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; jmp new_frame
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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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.include "hgr_table.s"
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; we could calculate these, or else build them from
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; a 0..pi/2 table to save a lot of space
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; the alignment was there to potentially save cycles on page
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; crossing. Maybe not as useful that the cosine
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; goes off the page
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; which of 7 pixels to draw
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; note high bit is set to pick blue/orange palette
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; clear to get purple/green instead
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log_lookup:
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.byte $81,$82,$84,$88,$90,$A0,$C0,$80
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sin_t:
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.byte $0F,$0E,$0D,$0D,$0C,$0C,$0B,$0B,$0A,$0A,$09,$09,$08,$08,$08,$07
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.byte $07,$07,$06,$06,$06,$06,$06,$06,$05,$05,$05,$05,$05,$05,$05,$05
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.byte $05,$06,$06,$06,$06,$06,$06,$07,$07,$07,$08,$08,$08,$09,$09,$0A
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.byte $0A,$0B,$0B,$0C,$0C,$0D,$0D,$0E,$0F,$0F,$10,$10,$11,$12,$13,$13
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.byte $14,$15,$16,$17,$17,$18,$19,$1A,$1B,$1C,$1D,$1D,$1E,$1F,$20,$21
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.byte $22,$23,$24,$25,$26,$27,$28,$29,$2A,$2B,$2C,$2D,$2E,$2F,$30,$31
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.byte $32,$33,$34,$35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$3F,$3F,$40
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.byte $41,$42,$43,$44,$45,$45,$46,$47,$48,$49,$49,$4A,$4B,$4C,$4C,$4D
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.byte $4D,$4E,$4F,$4F,$50,$50,$51,$51,$52,$52,$53,$53,$54,$54,$54,$55
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.byte $55,$55,$56,$56,$56,$56,$56,$56,$57,$57,$57,$57,$57,$57,$57,$57
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.byte $57,$56,$56,$56,$56,$56,$56,$55,$55,$55,$54,$54,$54,$53,$53,$52
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.byte $52,$51,$51,$50,$50,$4F,$4F,$4E,$4D,$4D,$4C,$4C,$4B,$4A,$49,$49
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.byte $48,$47,$46,$45,$45,$44,$43,$42,$41,$40,$3F,$3F,$3E,$3D,$3C,$3B
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.byte $3A,$39,$38,$37,$36,$35,$34,$33,$32,$31,$30,$2F,$2E,$2D,$2C,$2B
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.byte $2A,$29,$28,$27,$26,$25,$24,$23,$22,$21,$20,$1F,$1E,$1D,$1D,$1C
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.byte $1B,$1A,$19,$18,$17,$17,$16,$15,$14,$13,$13,$12,$11,$10,$10,$0F
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cos_t:
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.byte $14,$15,$16,$17,$17,$18,$19,$1A,$1B,$1C,$1D,$1D,$1E,$1F,$20,$21
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.byte $22,$23,$24,$25,$26,$27,$28,$29,$2A,$2B,$2C,$2D,$2E,$2F,$30,$31
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.byte $32,$33,$34,$35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$3F,$3F,$40
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.byte $41,$42,$43,$44,$45,$45,$46,$47,$48,$49,$49,$4A,$4B,$4C,$4C,$4D
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.byte $4D,$4E,$4F,$4F,$50,$50,$51,$51,$52,$52,$53,$53,$54,$54,$54,$55
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.byte $55,$55,$56,$56,$56,$56,$56,$56,$57,$57,$57,$57,$57,$57,$57,$57
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.byte $57,$56,$56,$56,$56,$56,$56,$55,$55,$55,$54,$54,$54,$53,$53,$52
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.byte $52,$51,$51,$50,$50,$4F,$4F,$4E,$4D,$4D,$4C,$4C,$4B,$4A,$49,$49
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.byte $48,$47,$46,$45,$45,$44,$43,$42,$41,$40,$3F,$3F,$3E,$3D,$3C,$3B
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.byte $3A,$39,$38,$37,$36,$35,$34,$33,$32,$31,$30,$2F,$2E,$2D,$2C,$2B
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.byte $2A,$29,$28,$27,$26,$25,$24,$23,$22,$21,$20,$1F,$1E,$1D,$1D,$1C
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.byte $1B,$1A,$19,$18,$17,$17,$16,$15,$14,$13,$13,$12,$11,$10,$10,$0F
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.byte $0F,$0E,$0D,$0D,$0C,$0C,$0B,$0B,$0A,$0A,$09,$09,$08,$08,$08,$07
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.byte $07,$07,$06,$06,$06,$06,$06,$06,$05,$05,$05,$05,$05,$05,$05,$05
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.byte $05,$06,$06,$06,$06,$06,$06,$07,$07,$07,$08,$08,$08,$09,$09,$0A
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.byte $0A,$0B,$0B,$0C,$0C,$0D,$0D,$0E,$0F,$0F,$10,$10,$11,$12,$13,$13
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