mirror of https://github.com/a2-4am/4cade.git
102 lines
1.8 KiB
Plaintext
102 lines
1.8 KiB
Plaintext
;license:MIT
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;(c) 2020 by 4am
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;
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!cpu 6502
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!to "build/FX.INDEXED/REDLINES",plain
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*=$6000
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row1 = $fe
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row2 = $ff
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!source "src/fx/macros.a"
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!source "src/constants.a"
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lda #$00
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sta row1
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lda #$BF
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sta row2
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@loop1
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jsr WaitForVBL
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lda row1
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jsr DrawRedLine
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lda row2
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jsr DrawRedLine
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ldx row1
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beq +
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dex
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txa
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jsr DrawBlackLine
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+ ldx row2
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inx
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cpx #$C0
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beq +
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txa
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jsr DrawBlackLine
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+
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lda #$30
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jsr WaitForKeyWithTimeout
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bmi @exit
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inc row1
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dec row2
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lda row1
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cmp #$60
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bne @loop1
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@loop2
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jsr WaitForVBL
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lda row1
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cmp #$C0
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beq +
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jsr DrawRedLine
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+ lda row2
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bmi +
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jsr DrawRedLine
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+ ldx row1
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dex
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txa
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jsr CopyLine
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ldx row2
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inx
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txa
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jsr CopyLine
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lda #$30
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jsr WaitForKeyWithTimeout
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bmi @exit
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inc row1
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dec row2
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lda row1
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cmp #$C1
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bne @loop2
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@exit jmp UnwaitForVBL
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DrawRedLine
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jsr HGRCalc
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ldy #$27
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lda #$AA
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- eor #$7F
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sta ($26), y
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dey
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bpl -
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rts
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DrawBlackLine
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jsr HGRCalc
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ldy #$27
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lda #$00
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- sta ($26), y
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dey
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bpl -
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rts
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CopyLine
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jsr HGRCalc
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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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rts
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!source "src/wait.a"
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+HGR_CALC_ROUTINES
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