mirror of https://github.com/a2-4am/4cade.git
125 lines
2.2 KiB
Plaintext
125 lines
2.2 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/CENTER.BY.PIXEL",plain
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*=$6000
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copymask1 = $f2
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copymask2 = $f3
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skipcounter = $f7
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top = $f9
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bottom = $fa
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counter = $fb
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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 #44
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sta skipcounter
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lda #$5F
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sta counter
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lda #0
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sta top
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lda #$BF
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sta bottom
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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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+HGR_ROW_CALC
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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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and copymask1
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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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and copymask2
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eor ($26),y
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sta ($26),y
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clc
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+HGR_INC_WITHIN_BLOCK
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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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dec skipcounter
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+LBPL SkipTopAndBottom
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lda top
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+HGR_CALC
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ldy #39
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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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inc top
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lda bottom
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+HGR_CALC
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ldy #39
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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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dec bottom
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dec counter
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bmi Exit
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SkipTopAndBottom
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lda $c000
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bmi Exit
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dec maskindex
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+LBPL MaskLoop
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inc col1
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dec col2
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+LBNE 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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