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dos33fsprogs/graphics/hgr/tiny_triangles/mod9.s

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graphics: hgr: update mod9 code
2021-04-10 05:14:59 +00:00
; Sort of plotting (X^Y) % 9
; but in hires
; by Vince `deater` Weaver <vince@deater.net>
ootw: update graphics
2021-04-10 03:33:27 +00:00
GBASL = $26
GBASH = $27
HGRPAGE = $E6
HGR_BITS = $1C
HGR_X = $E0
HGR_Y = $E2
HGR_COLOR = $E4
HGR_HORIZ = $E5
graphics: hgr: update mod9 code
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OUR_MASK = $FB
YY = $FC
ootw: update graphics
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SAVEX = $FD
TEMP = $FE
OLD = $FF
graphics: hgr: update mod9 code
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PAGE0 = $C054
PAGE1 = $C055
ootw: update graphics
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graphics: hgr: update mod9 code
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COLORTBL = $F6F6
ootw: update graphics
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graphics: hgr: update mod9 code
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HGR2 = $F3D8
HGR = $F3E2
HCLR = $F3F2
HPOSN = $F411
HPLOT0 = $F457 ; plot at (Y,X), (A)
HPLOT1 = $F45A ; skip the HPOSN call
COLOR_SHIFT = $F47E ; shift color for odd/even Y (0..7 or 7..13)
MOVE_RIGHT = $F48A ; move next plot location one to the right
ootw: update graphics
2021-04-10 03:33:27 +00:00
graphics: hgr: update mod9 code
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HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
ootw: update graphics
2021-04-10 03:33:27 +00:00
mod9_lookup = $1000
graphics: hgr: update mod9 code
2021-04-10 05:14:59 +00:00
;==============================
; mod9 start
;==============================
ootw: update graphics
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mod9_start:
graphics: hgr: update mod9 code
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jsr make_mod9_lookup ; setup modulo 9 lookup table
; could inline it here
ootw: update graphics
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jsr HGR2 ; clear page1
; A is 0 after
graphics: hgr: update mod9 code
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sta OUR_MASK
ootw: update graphics
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graphics: hgr: update mod9 code
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mod9_reset:
ootw: update graphics
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ldy #0
graphics: hgr: update mod9 code
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sty YY
mod9_yloop:
ootw: update graphics
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graphics: hgr: update mod9 code
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ldy #0
ldx #0 ; XX = 0
lda YY ; Y co-ord
jsr HPOSN ; set cursor position to (Y,X), (A)
ootw: update graphics
2021-04-10 03:33:27 +00:00
ldx #0
tiny_xloop:
stx SAVEX
;===============here
txa
graphics: hgr: update mod9 code
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eor YY
ootw: update graphics
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tax
lda mod9_lookup,X
graphics: hgr: update mod9 code
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;=================
ldx OUR_MASK
bne weird_pattern
cmp #0
beq store_color
lda #3
store_color:
jmp color_ready
ootw: update graphics
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graphics: hgr: update mod9 code
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weird_pattern:
and OUR_MASK
color_ready:
ootw: update graphics
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tax
tya
lsr ; check even or odd
php
lda COLORTBL,X
sta HGR_BITS
plp
bcc no_shift
jsr COLOR_SHIFT ; if odd then color shift
no_shift:
graphics: hgr: update mod9 code
2021-04-10 05:14:59 +00:00
jsr HPLOT1 ; plot at current position
ootw: update graphics
2021-04-10 03:33:27 +00:00
graphics: hgr: update mod9 code
2021-04-10 05:14:59 +00:00
jsr MOVE_RIGHT ; move current position right (trashes A)
ootw: update graphics
2021-04-10 03:33:27 +00:00
graphics: hgr: update mod9 code
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ldx SAVEX ; restore X
ootw: update graphics
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graphics: hgr: update mod9 code
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;==================================
ootw: update graphics
2021-04-10 03:33:27 +00:00
inx
graphics: hgr: update mod9 code
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bne tiny_xloop ; repeat until X=256
ootw: update graphics
2021-04-10 03:33:27 +00:00
graphics: hgr: update mod9 code
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;==================================
inc YY ; repeat until Y=192
ldy YY
ootw: update graphics
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cpy #192
graphics: hgr: update mod9 code
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bne mod9_yloop
ootw: update graphics
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graphics: hgr: update mod9 code
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;==================================
change_pattern:
inc OUR_MASK ; change pattern
lda OUR_MASK
ootw: update graphics
2021-04-10 03:33:27 +00:00
graphics: hgr: update mod9 code
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check_4:
cmp #4
bne check_9
lda #8
sta OUR_MASK
ootw: update graphics
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graphics: hgr: update mod9 code
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check_9:
cmp #9
bne done_check
lda #0
sta OUR_MASK
ootw: update graphics
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graphics: hgr: update mod9 code
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done_check:
jmp mod9_reset
;=============================
; setup the mod9 lookup table
;=============================
ootw: update graphics
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make_mod9_lookup:
ldy #0
m9_xreset:
ldx #0
m9_loop:
txa
sta mod9_lookup,Y
graphics: hgr: update mod9 code
2021-04-10 05:14:59 +00:00
ootw: update graphics
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iny
beq m9_done
graphics: hgr: update mod9 code
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ootw: update graphics
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inx
cpx #9
beq m9_xreset
bne m9_loop
graphics: hgr: update mod9 code
2021-04-10 05:14:59 +00:00
ootw: update graphics
2021-04-10 03:33:27 +00:00
m9_done:
rts
mod9: update
2021-04-12 05:33:27 +00:00
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