dos33fsprogs/hellmood_memories/sier.s

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; Sierpinski, based on the code in Hellmood's Memories
; by deater (Vince Weaver) <vince@deater.net>
; Zero Page
GBASL = $26
GBASH = $27
H2 = $2C
MASK = $2F
COLOR = $30
BH = $EF
Y1 = $F0
Y2 = $F1
NUM1L = $F2
NUM1H = $F3
NUM2L = $F4
NUM2H = $F5
RESULT0 = $F6
RESULT1 = $F7
RESULT2 = $F8
RESULT3 = $F9
TEMP = $FA
TEMPY = $FB
FRAMEL = $FC
FRAMEH = $FD
TEMPX = $FE
SCALED = $FF
; Soft Switches
KEYPRESS= $C000
KEYRESET= $C010
SET_GR = $C050 ; Enable graphics
FULLGR = $C052 ; Full screen, no text
PAGE0 = $C054 ; Page0
PAGE1 = $C055 ; Page1
LORES = $C056 ; Enable LORES graphics
; ROM routines
PLOT = $F800 ; plot, horiz=y, vert=A (A trashed, XY Saved)
SETCOL = $F864
TEXT = $FB36 ;; Set text mode
BASCALC = $FBC1
SETGR = $FB40
HOME = $FC58 ;; Clear the text screen
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
HLINE = $F819
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sierpx = $3000
sierpy = $3100
scaledx = $3200
scaledy = $3300
sierpinksi:
;===================
; init screen
jsr SETGR ; 3
bit FULLGR ; 3
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; lda #>(2048)
lda #0
sta FRAMEH
lda #0
sta FRAMEL
jsr init_multiply_tables
sierpinski_forever:
inc FRAMEL ; 2
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bne done_frame_inc
inc FRAMEH
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done_frame_inc:
; pre-generate the multiplications
jsr sierpinski_generate
ldx #47 ; yy ; 2
yloop:
ldy #39 ; xx ; 2
xloop:
; t=frame-2048 (assuming we are effect #4?)
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; lda FRAMEL
; sta NUM1L
; sec
; lda FRAMEH
; sbc #>(2048)
; rol NUM1L ; time<<=3, speed up by factor of 8
; rol
; rol NUM1L
; rol
; rol NUM1L
; rol
; sta NUM1H
; txa ; yy*=4
; asl
; asl
; sta NUM2L
; sta Y1
; lda #0
; sta NUM2H
; jsr multiply_u16x16 ; result = Y*T
; tya
; asl
; asl
; sta NUM2L
; lda #0
; rol NUM2L
; rol
; sta NUM2H ; NUM2 = X*8
; sign extend X
; xsext=xprime*8; // get X into DL
; if (xsext&0x80*8) xsext|=0xff00*8;
; else xsext&=0x00ff*8;
clc
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lda sierpy,X ; RESULT1
adc scaledx,Y ; NUM2L
sta BH ; bh=((y*t)/256)+X
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; jsr multiply_u16x16_same_num1 ; result = X*T
; dh=RESULT1
; dh=(temp>>8)&0xff; // dh=(X*T/256)
; color=(yy-dh)&bh; // color=(Y-(X*T/256))&(Y*T/256+X)
sec
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txa
lda scaledy,X ; Y1
sbc sierpx,Y ; RESULT1
and BH
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and #$f8 ; thicker sierpinksi
; if zero, color=9. Otherwise, 0
bne color_black ; leave black if not sierpinksi
lda #$99 ; otherwise: a nice orange
bne color_done
color_black:
lda #$00
color_done:
sta COLOR
txa ; A==Y1 ; 1
; jsr PLOT ; (X2,Y1) ; 3
jsr fast_plot
dey ; 1
bpl xloop ; 2
dex ; 1
bpl yloop ; 2
bmi sierpinski_forever ; 2
; for grabbing screenshot
;check_key:
; bit KEYPRESS
; bpl check_key
; jmp sierpinski_forever ; 2
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sierpinski_generate:
; t=frame-2048 (assuming we are effect #4?)
lda FRAMEL
sta NUM1L
; sec
lda FRAMEH
; sbc #>(2048)
rol NUM1L ; time<<=3, speed up by factor of 8
rol
rol NUM1L
rol
rol NUM1L
rol
sta NUM1H
jsr multiply_u16x16 ; setup NUM1H/NUM1L
;========================
ldx #47 ; yy ; 2
genyloop:
txa ; yy*=4
asl
asl
sta NUM2L
sta scaledy,X
lda #0
sta NUM2H
jsr multiply_u16x16_same_num1 ; result = Y*T
lda RESULT1
sta sierpy,X
dex ; 1
bpl genyloop ; 2
;====================
;====================
;====================
ldy #39 ; xx ; 2
genxloop:
tya
asl
asl
sta NUM2L
lda #0
rol NUM2L
rol
sta NUM2H ; NUM2 = X*8
lda NUM2L
sta scaledx,Y
; sign extend X
; xsext=xprime*8; // get X into DL
; if (xsext&0x80*8) xsext|=0xff00*8;
; else xsext&=0x00ff*8;
jsr multiply_u16x16_same_num1 ; result = X*T
lda RESULT1
sta sierpx,Y
dey ; 1
bpl genxloop ; 2
rts
.include "fast_plot.s"
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.include "multiply_tables.s"
;.include "multiply_s16x16.s"
.include "multiply_u16x16_mod.s"
; original
; + plot is $5d cycles (93), so 178560 to draw screen
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; + $169 (361) to calculate
; + 693120+178560 = 872k to draw screen (~1fps)
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; with lookup table:
; + plot is $5d cycles (93), so 178560 to draw screen
; + $3a (58) to calculate
; + $2e5c (11,868) to setup tables
; + 111360+178560+11868=290k (~3fps)
; with lookup table+inline fast_plot
; + plot is $31 cycles (49), so 94080 to draw screen
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; + $3a (58) to calculate
; + $2e5c (11,868) to setup tables
; + 111360+94080+11868=217k (~4fps)