147 lines
1.9 KiB
ArmAsm
147 lines
1.9 KiB
ArmAsm
; Parallax Sierpinski/xor boxes HGR
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; by deater (Vince Weaver) <vince@deater.net>
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; Zero Page
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GBASL = $26
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GBASH = $27
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HGR_X = $E0
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HGR_Y = $E2
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HGR_COLOR = $E4
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HGR_HORIZ = $E5
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HGR_PAGE = $E6
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XX = $FF
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; Soft Switches
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SET_GR = $C050
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SET_TEXT = $C051
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FULLGR = $C052
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TEXTGR = $C053
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PAGE1 = $C054 ; Page1
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PAGE2 = $C055 ; Page2
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LORES = $C056 ; Enable LORES graphics
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HIRES = $C057 ; Enable HIRES graphics
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; ROM routines
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HGR = $F3E2
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HGR2 = $F3D8
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HCLR = $F3F2
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HPLOT0 = $F457 ; plot at (Y,X), (A)
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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HPOSN = $F411 ; (Y,X),(A) (valued stores in HGRX,XH,Y)
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PLOT = $F800 ;; PLOT AT Y,A
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SETCOL = $F864 ;; COLOR=A
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hgr_lookup_h = $1000
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hgr_lookup_l = $1100
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div4_lookup = $90
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parallax:
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;===================
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; init screen
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jsr HGR ; clear PAGE1
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bit FULLGR
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;===================
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; int tables
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ldx #191
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init_loop:
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txa
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pha
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jsr HPOSN
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pla
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tax
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lda GBASL
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sta hgr_lookup_l,X
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lda GBASH
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; and #$1F ; 20 30 001X 40 50 010X
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sta hgr_lookup_h,X
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dex
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cpx #$ff
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bne init_loop
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draw_sier:
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ldx #47
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sier_outer:
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lda hgr_lookup_l,X
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sta GBASL
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lda hgr_lookup_h,X
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sta GBASH
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stx XX
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ldy #39
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sier_inner:
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tya
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and XX
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beq not_zero
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lda #00
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beq zero
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not_zero:
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lda #$7f
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zero:
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sta (GBASL),Y
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dey
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bpl sier_inner
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dex
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cpx #$ff
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bne sier_outer
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;===============================
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; copy to lores
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bit LORES
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ldx #47
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lsier_outer:
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lda hgr_lookup_l,X
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sta hgr_scrn_smc+1
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lda hgr_lookup_h,X
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sta hgr_scrn_smc+2
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stx XX
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ldy #39
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lsier_inner:
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hgr_scrn_smc:
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lda $2000,Y
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jsr SETCOL ; color is A
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tya
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pha
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txa
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jsr PLOT ; plot at Y,A
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pla
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tay
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dey
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bpl lsier_inner
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dex
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cpx #$ff
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bne lsier_outer
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end:
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jmp end
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