mirror of https://github.com/a2-4am/4cade.git
99 lines
1.8 KiB
Plaintext
99 lines
1.8 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/MEETINTHEMIDDLE",plain
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*=$6000
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maskindex = $fc
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row = $fd
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col1 = $fe
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col2 = $ff
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!source "src/fx/macros.a"
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!source "src/constants.a"
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lda #0
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sta col1
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lda #39
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sta col2
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@colloop
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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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ldx maskindex
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lda copymasks1,x
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sta @copymask1
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lda copymasks2,x
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sta @copymask2
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lda #23
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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 #8
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@blockloop
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ldy col1
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lda ($26),y
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eor ($3c),y
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@copymask1=*+1
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and #0 ; SMC
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eor ($26),y
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sta ($26),y
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ldy col2
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lda ($26),y
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eor ($3c),y
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@copymask2=*+1
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and #0 ; SMC
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eor ($26),y
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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 #1
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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 col1
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dec col2
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lda col1
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cmp #20
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bne @colloop
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@exit jmp UnwaitForVBL
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copymasks1
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!byte %11111111
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!byte %10111111
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!byte %10011111
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!byte %10001111
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!byte %10000111
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!byte %10000011
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!byte %10000001
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copymasks2
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!byte %11111111
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!byte %11111110
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!byte %11111100
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!byte %11111000
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!byte %11110000
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!byte %11100000
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!byte %11000000
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!source "src/wait.a"
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+HGR_CALC_ROUTINES
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