mirror of
https://github.com/a2-4am/4cade.git
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161 lines
3.1 KiB
Plaintext
161 lines
3.1 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/SOFT.UD",plain
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*=$6000
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tmp = $fb
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maskindex = $fc
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row = $fd
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lda #$FA
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sta row
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@rowloop
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lda #6
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sta maskindex
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jsr WaitForVBL
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@maskloop
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lda row
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bmi @skiprow
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cmp #24
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bcs @skiprow
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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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lda #<masks
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sta @basemaskaddr
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lda #>masks
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sta @basemaskaddr+1
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lda maskindex
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asl
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asl
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asl
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clc
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adc @basemaskaddr
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sta @basemaskaddr
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bcc +
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inc @basemaskaddr+1
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+
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ldx #7
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@blockloop
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@basemaskaddr=*+1
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lda $FDFD,x ; SMC
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sta @copymask
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eor #%11111111
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sta @sourcemask
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ldy #39
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@colloop
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lda ($26),y
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@sourcemask=*+1
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and #0 ; SMC
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sta tmp
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lda ($3c),y
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@copymask=*+1
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and #0 ; SMC
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ora tmp
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sta ($26),y
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dey
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bpl @colloop
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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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bpl @blockloop
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@skiprow
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inc row
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dec maskindex
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bpl @maskloop
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lda #40
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jsr WaitForKeyWithTimeout
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bmi @exit
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dec row
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dec row
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dec row
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dec row
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dec row
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dec row
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lda row
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bmi @rowloop
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cmp #24
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bcc @rowloop
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@exit rts
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masks
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10001000
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!byte %10001000
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10010100
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!byte %10001000
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!byte %10001000
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!byte %10010100
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10011100
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!byte %10011100
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!byte %10011100
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!byte %10011100
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10101010
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!byte %10011100
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!byte %10111110
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!byte %10011100
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!byte %10011100
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!byte %10101010
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!byte %10000000
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!byte %10000000
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10000000
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!byte %11010101
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!byte %10111110
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!byte %11111111
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!byte %10111110
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!byte %11111111
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!byte %10111110
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!byte %10111110
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!byte %11010101
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!byte %11111111
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!byte %11111111
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!byte %11111111
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!byte %11111111
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!byte %11111111
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!byte %11111111
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!byte %11111111
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!byte %11111111
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!source "src/wait.a"
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!source "src/fx/fx.hgr.common.a"
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!source "src/fx/hw.vbl.a"
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