mirror of https://github.com/a2-4am/4cade.git
170 lines
3.1 KiB
Plaintext
170 lines
3.1 KiB
Plaintext
;license:MIT
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;(c) 2018-2020 by 4am/qkumba
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;
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!cpu 6502
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!to "build/FX.INDEXED/FOURSQUARE",plain
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*=$6000
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!source "src/fx/macros.a"
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lda #23
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sta $FD
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lda #<Coordinates
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sta $FE
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lda #>Coordinates
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sta $FF
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ldy #0
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sty $F7
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ldx #11
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stx $F8
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txa
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inx
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stx $F9
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ldx #19
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stx $FA
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inx
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stx $FB
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ldx #39
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stx $FC
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- lda $F7
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ldx $F8
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jsr @box2
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lda $F9
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ldx $FD
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jsr @box2
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lda #$FF
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jsr stainc
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jsr stainc
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dec $F8
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inc $F9
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dec $FA
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inc $FB
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dec $FC
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dec $FD
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inc $F7
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lda $F7
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cmp #6
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bne -
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lda #$80
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sta Coordinates+$798
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lda #<Coordinates
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sta $FE
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lda #>Coordinates
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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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@box2 sta $F4
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stx $F5
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jsr @box1
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ldx $F4
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- inx
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cpx $F5
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bcs +
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jsr txasta
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lda $F7
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jsr statxa
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lda $FA
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jsr statxa
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lda $FB
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jsr statxa
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lda $FC
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jsr stainc
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bne - ; always branches
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+ txa
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; fall through
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@box1 ldx $FA
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stx $F6
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ldx $F7
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jsr +
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ldx $FC
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stx $F6
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ldx $FB
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+
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- jsr stainc
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pha
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txa
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jsr stainc
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pla
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cpx $F6
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inx
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bcc -
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rts
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statxa jsr stainc
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txasta txa
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stainc sta ($FE), y
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iny
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bne +
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inc $FF
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+ rts
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!source "src/wait.a"
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+HGR_WHITE_ROUTINES
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+HGR_BLOCK_COPY_ROUTINES
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!byte $80,$80
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!if * and 1 {
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!byte 0
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}
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Coordinates
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