mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 08:05:31 +00:00
177 lines
2.4 KiB
ArmAsm
177 lines
2.4 KiB
ArmAsm
; Sierpinski, based on the code in Hellmood's Memories
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; by deater (Vince Weaver) <vince@deater.net>
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; Zero Page
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BASL = $28
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BASH = $29
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H2 = $2C
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COLOR = $30
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BH = $EF
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Y1 = $F0
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Y2 = $F1
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NUM1L = $F2
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NUM1H = $F3
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NUM2L = $F4
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NUM2H = $F5
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RESULT0 = $F6
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RESULT1 = $F7
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RESULT2 = $F8
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RESULT3 = $F9
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TEMP = $FA
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TEMPY = $FB
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FRAMEL = $FC
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FRAMEH = $FD
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TEMPX = $FE
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SCALED = $FF
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; Soft Switches
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KEYPRESS= $C000
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KEYRESET= $C010
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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PAGE0 = $C054 ; Page0
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PAGE1 = $C055 ; Page1
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LORES = $C056 ; Enable LORES graphics
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; ROM routines
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PLOT = $F800 ; plot, horiz=y, vert=A (A trashed, XY Saved)
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SETCOL = $F864
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TEXT = $FB36 ;; Set text mode
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BASCALC = $FBC1
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SETGR = $FB40
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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HLINE = $F819
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sierpinksi:
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;===================
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; init screen
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jsr SETGR ; 3
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bit FULLGR ; 3
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; lda #>(2048)
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lda #0
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sta FRAMEH
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lda #0
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sta FRAMEL
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jsr init_multiply_tables
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sierpinski_forever:
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ldx #47 ; yy ; 2
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inc FRAMEL ; 2
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bne yloop
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inc FRAMEH
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yloop:
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ldy #39 ; xx ; 2
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xloop:
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; t=frame-2048 (assuming we are effect #4?)
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lda FRAMEL
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sta NUM1L
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; sec
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lda FRAMEH
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; sbc #>(2048)
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rol NUM1L ; time<<=3, speed up by factor of 8
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rol
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rol NUM1L
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rol
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rol NUM1L
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rol
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sta NUM1H
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txa ; yy*=4
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asl
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asl
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sta NUM2L
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sta Y1
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lda #0
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sta NUM2H
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jsr multiply_u16x16 ; result = Y*T
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tya
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asl
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asl
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sta NUM2L
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lda #0
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rol NUM2L
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rol
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sta NUM2H ; NUM2 = X*8
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; sign extend X
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; xsext=xprime*8; // get X into DL
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; if (xsext&0x80*8) xsext|=0xff00*8;
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; else xsext&=0x00ff*8;
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clc
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lda RESULT1
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adc NUM2L
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sta BH ; bh=((y*t)/256)+X
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jsr multiply_u16x16_same_num1 ; result = X*T
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; dh=RESULT1
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; dh=(temp>>8)&0xff; // dh=(X*T/256)
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; color=(yy-dh)&bh; // color=(Y-(X*T/256))&(Y*T/256+X)
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sec
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txa
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lda Y1
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sbc RESULT1
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and BH
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and #$f8 ; thicker sierpinksi
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; if zero, color=9. Otherwise, 0
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bne color_black ; leave black if not sierpinksi
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lda #$99 ; otherwise: a nice orange
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bne color_done
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color_black:
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lda #$00
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color_done:
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sta COLOR
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txa ; A==Y1 ; 1
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jsr PLOT ; (X2,Y1) ; 3
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dey ; 1
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bpl xloop ; 2
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dex ; 1
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bpl yloop ; 2
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bmi sierpinski_forever ; 2
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.include "multiply_tables.s"
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;.include "multiply_s16x16.s"
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.include "multiply_u16x16_mod.s"
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; plot is 57 cycles, so 109440 to draw screen
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; 169 to cal
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; 433k to draw screen (2fps?)
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