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https://github.com/deater/dos33fsprogs.git
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120 lines
2.0 KiB
ArmAsm
120 lines
2.0 KiB
ArmAsm
; make pictures by drawing boxes
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; 223 -- initial
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; 220 -- update end
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; 219 -- store color already multiplied by 17
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; 215 -- load Y0 directly into X
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; 211 -- load X1 directly into H2
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; 208 -- add subroutine to read byte into A, no need to save Y
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; 205 -- optimize end loop
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; 197 -- only update color if changed
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.include "zp.inc"
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.include "hardware.inc"
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X0 = $F0
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Y1 = $F3
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;1DEFFNP(X)=PEEK(2054+I*5+X)-32:
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;GR:POKE49234,0:
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;FORI=0TO29:COLOR=FNP(0):FORY=FNP(3)TOFNP(4)
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;:HLINFNP(1),FNP(2)ATY:NEXTY,I:GETA
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;================================
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; Clear screen and setup graphics
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;================================
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boxes:
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jsr SETGR ; set lo-res 40x40 mode
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bit FULLGR ; make it 40x48
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draw_box_loop:
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; get color
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jsr load_byte
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bmi use_old_color
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cmp #$7F
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end:
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beq end ; hit end
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jsr SETCOL
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jsr load_byte ; Y0
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use_old_color:
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and #$3f
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tax
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jsr load_byte ; Y1
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sta Y1
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jsr load_byte ; X0
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sta X0
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jsr load_byte ; X1
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sta H2
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inner_loop:
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;; HLINE Y,H2 at A
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;; X left alone, carry set on exit
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;; H2 left alone
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;; Y and A trashed
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ldy X0
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txa
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jsr HLINE
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cpx Y1
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inx
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bcc inner_loop
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bcs draw_box_loop
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load_byte:
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inc load_byte_smc+1 ; assume we are always < 256 bytes
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; so no need to wrap
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load_byte_smc:
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lda box_data-1
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rts
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; 4 6 6 6 6
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box_data:
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.byte $0F,$00,$2F,$00,$27
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.byte $08,$01,$2B,$0A,$1B
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.byte $0D,$28,$29,$03,$14
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.byte $A4,$27,$03,$16
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.byte $A0,$23,$05,$17
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.byte $9C,$1F,$08,$18
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.byte $08,$23,$26,$07,$0E
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.byte $A4,$27,$08,$12
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.byte $9F,$1F,$0D,$12
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.byte $05,$2A,$2B,$03,$14
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.byte $AC,$2D,$06,$13
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.byte $08,$2C,$2D,$14,$17
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.byte $88,$16,$1C,$1C
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.byte $0D,$02,$1A,$09,$18
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.byte $08,$04,$18,$0A,$15
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.byte $00,$06,$17,$0B,$14
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.byte $08,$15,$29,$22,$22
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.byte $93,$28,$22,$24
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.byte $05,$13,$14,$1C,$23
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.byte $95,$16,$1B,$21
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.byte $0D,$17,$2B,$19,$21
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.byte $00,$18,$20,$1A,$20
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.byte $A2,$2A,$1A,$20
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.byte $05,$1C,$1C,$1B,$20
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.byte $A6,$26,$1B,$20
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.byte $03,$1F,$20,$1F,$1F
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.byte $A9,$2A,$1F,$1F
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.byte $05,$19,$1E,$1D,$1E
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.byte $A3,$28,$1D,$1E
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.byte $0C,$02,$03,$17,$17
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.byte $7F
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