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76 lines
1.5 KiB
Plaintext
76 lines
1.5 KiB
Plaintext
;license:MIT
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;(c) 2018 by 4am
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;
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!cpu 6502
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!to "build/FX/ONESQUARE",plain
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*=$6000
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lda #<@coords
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sta $FE
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lda #>@coords
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sta $FF
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ldy #$00
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@loop1
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lda ($FE),y
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bpl @copy
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lda #$18
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jsr WaitForKeyWithTimeout
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bmi @exit
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bpl @next ; always branches
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@copy
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tax
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iny
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lda ($fe),y
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tay
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txa
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jsr HGRBlockToWhite
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@next
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inc $FE
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bne +
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inc $FF
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+ inc $FE
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bne +
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inc $FF
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+ ldy #$00
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lda ($FE),y
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cmp #$80
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bne @loop1
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@loop2
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dec $FE
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lda $FE
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cmp #$FF
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bne +
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dec $FF
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+ dec $FE
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lda $FE
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cmp #$FF
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bne +
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dec $FF
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+ ldy #$00
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lda ($FE),y
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cmp #$80
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beq @exit
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lda ($FE),y
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bpl @copy2
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lda #$18
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jsr WaitForKeyWithTimeout
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bmi @exit
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bpl @loop2 ; always branches
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@copy2
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tax
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iny
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lda ($fe),y
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tay
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txa
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jsr HGRBlockCopy
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beq @loop2 ; always branches
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@exit rts
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!byte $80,$80
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@coords
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!source "src/fx/fx.hgr.onesquare.data.a"
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!byte $80
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!source "src/wait.a"
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!source "src/fx/fx.hgr.common.a"
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