mirror of https://github.com/a2-4am/4cade.git
116 lines
2.3 KiB
Plaintext
116 lines
2.3 KiB
Plaintext
;license:MIT
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;(c) 2019 by 4am
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;
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!cpu 6502
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!to "build/FX.INDEXED/LR.BY.PIXEL",plain
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*=$6000
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maskindex = $fd
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row = $fe
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col = $ff
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!source "src/fx/macros.a"
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!source "src/constants.a"
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@jump
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jmp @copy ; skip clear the first time
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;clear
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lda #$27
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sta col
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@clearcolloop
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lda #$06
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sta maskindex
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jsr WaitForVBL
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@clearmaskloop
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ldx maskindex
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lda clearmasks,x
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sta @clearmask
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lda #$17
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sta row
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@clearrowloop
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lda row
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asl
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asl
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asl
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jsr HGRCalc
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clc
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ldx #$08
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ldy col
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@clearblockloop
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lda ($26),y
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@clearmask=*+1
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and #$FD ; SMC
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sta ($26),y
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lda $27
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adc #4
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sta $27
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dex
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bne @clearblockloop
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dec row
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bpl @clearrowloop
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lda #8
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jsr WaitForKeyWithTimeout
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bmi @exit
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dec maskindex
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bpl @clearmaskloop
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dec col
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bpl @clearcolloop
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@copy
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lda #$2C ; BIT opcode
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sta @jump ; don't skip clear after first time
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; copy
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lda #$00
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sta col
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@colloop
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lda #$06
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sta maskindex
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jsr WaitForVBL
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@maskloop
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ldx maskindex
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lda copymasks,x
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sta @mask
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lda #$17
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sta row
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@rowloop
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lda row
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asl
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asl
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asl
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jsr HGRCalc
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clc
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ldx #$08
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ldy col
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@blockloop
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lda ($3c),y
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@mask=*+1
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and #$FD ; SMC
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sta ($26),y
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lda $27
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adc #4
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sta $27
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eor #$60
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sta $3d
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dex
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bne @blockloop
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dec row
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bpl @rowloop
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lda #8
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jsr WaitForKeyWithTimeout
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bmi @exit
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dec maskindex
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bpl @maskloop
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inc col
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lda col
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cmp #40
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bne @colloop
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@exit jmp UnwaitForVBL
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clearmasks
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!byte $80,$81,$83,$87,$8F,$9F,$BF
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copymasks
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!byte $FF,$BF,$9F,$8F,$87,$83,$81
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!source "src/wait.a"
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+HGR_CALC_ROUTINES
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