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125 lines
2.2 KiB
Plaintext
125 lines
2.2 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/SPLIT.UD.INTRO",plain
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*=$6000
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!source "src/fx/macros.a"
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col1 = $FE
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col2 = $FF
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lda #$00
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sta col1
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lda #$27
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sta col2
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@introloop
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lda #$17
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ldy col1
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jsr HGRHalfBlockToWhite
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lda #$18
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ldy col2
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jsr HGRHalfBlockToWhite
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lda #$40
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jsr WaitForKeyWithTimeout
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bpl +
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jmp @exit
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+
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inc col1
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dec col2
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bpl @introloop
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row1 = $FE
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row2 = $FF
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lda #$16
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sta row1
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lda #$19
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sta row2
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@outerloop
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lda row1
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bmi @skiptopwhite
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asl
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asl
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jsr HGRCalc
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ldx #$04
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@topwhite
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ldy #$27
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lda #$7F
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- sta ($26),y
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dey
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bpl -
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+HGR_INC_WITHIN_BLOCK
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dex
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bne @topwhite
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@skiptopwhite
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inc row1
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lda row1
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asl
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asl
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jsr HGRCalc
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ldx #$04
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@topcopy
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ldy #$27
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- lda ($3c),y
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sta ($26),y
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dey
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bpl -
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+HGR_INC_WITHIN_BLOCK
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dex
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bne @topcopy
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lda row2
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cmp #$30
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bcs @skipbottomwhite
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lda row2
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asl
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asl
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jsr HGRCalc
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ldx #$04
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@bottomwhite
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ldy #$27
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- lda #$7F
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sta ($26),y
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dey
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bpl -
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+HGR_INC_WITHIN_BLOCK
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dex
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bne @bottomwhite
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@skipbottomwhite
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dec row2
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lda row2
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asl
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asl
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jsr HGRCalc
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ldx #$04
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@bottomcopy
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ldy #$27
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- lda ($3c),y
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sta ($26),y
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dey
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bpl -
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+HGR_INC_WITHIN_BLOCK
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dex
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bne @bottomcopy
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lda #$28
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jsr WaitForKeyWithTimeout
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bmi @exit
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dec row1
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dec row1
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inc row2
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inc row2
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lda row1
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cmp #$FE
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beq @exit
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jmp @outerloop
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@exit rts
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!source "src/wait.a"
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!source "src/fx/fx.hgr.common.a"
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