mirror of https://github.com/a2-4am/4cade.git
84 lines
2.1 KiB
Plaintext
84 lines
2.1 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/FLICK",plain
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*=$6000
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rowcount = $FF ; [byte]
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hgrlo = $200 ; [$C0 bytes]
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startrows_by_column = $2C0 ; [$28 bytes]
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hgrhi = $300 ; [$C0 bytes]
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rowcounts_by_column = $3C0 ; [$28 bytes]
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!source "src/fx/macros.a"
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+BUILD_HGR_LOOKUP_TABLES hgrlo, hgrhi
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ldy #$27
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- lda #$00
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sta startrows_by_column, y
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lda initial_rowcounts, y
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sta rowcounts_by_column, y
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dey
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bpl -
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frameloop
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ldy #$27
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columnloop
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lda rowcounts_by_column, y
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beq nextcolumn
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bmi nextcolumn
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sta rowcount
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ldx startrows_by_column, y
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cpx #$C0
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bcs nextcolumn
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rowloop lda hgrlo, x
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sta $3c
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sta $26
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lda hgrhi, x
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sta $27
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eor #$60
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sta $3d
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lda ($3c), y
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sta ($26), y
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inx
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dec rowcount
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bne rowloop
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nextcolumn
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dey
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bpl columnloop
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ldy #$27
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- lda rowcounts_by_column, y
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bmi +
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beq +
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tax
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clc
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adc startrows_by_column, y
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sta startrows_by_column, y
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lda next_rowcount, x
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sta rowcounts_by_column, y
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bne ++ ; always branches
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+ clc
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adc #1
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sta rowcounts_by_column, y
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++ dey
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bpl -
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lda #$48
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jsr WaitForKeyWithTimeout
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bmi exit
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lda rowcounts_by_column+$27
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cmp #$80
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bne frameloop
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exit rts
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!source "src/wait.a"
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initial_rowcounts
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!byte $01,$01,$00,$00,$FF,$FF,$FE,$FE,$FD,$FD
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!byte $FC,$FC,$FB,$FB,$FA,$FA,$F9,$F9,$F8,$F8
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!byte $F7,$F7,$F6,$F6,$F5,$F5,$F4,$F4,$F3,$F3
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!byte $F2,$F2,$F1,$F1,$F0,$F0,$EF,$EF,$EE,$EE
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next_rowcount
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!byte $01,$03,$80,$05,$02,$07,$04,$09,$06,$0B,$08,$0D,$0A,$0F,$0C,$11,$0E,$15,$10,$FD,$FD,$12
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