mirror of
https://github.com/a2-4am/4cade.git
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149 lines
3.0 KiB
Plaintext
149 lines
3.0 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/DIAMOND",plain
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*=$6000
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y = $fc
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row = $fd
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col = $fe
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counter = $ff
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!source "src/fx/macros.a"
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lda #32
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sta counter
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lda #39
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sta col
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@colloop
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lda #23
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sta row
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ldy col
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sty y
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jsr WaitForVBL
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@rowloop
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; check if this column is visible
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ldy y
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bpl +
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- jmp @skip1
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+ cpy #40
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bcs -
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; do corner 1
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+SWITCH_TO_MASKS copymasks1
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lda row
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jsr HGRBlockCopyWithMask
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; do corner 2 (same row, opposing col)
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+SWITCH_TO_MASKS copymasks2
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lda #39
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sec
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sbc y
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tay
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lda row
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jsr HGRBlockCopyWithMask
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; do corner 3 (opposing row, opposing col)
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+SWITCH_TO_MASKS copymasks3
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lda #39
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sec
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sbc y
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tay
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lda #23
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sec
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sbc row
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jsr HGRBlockCopyWithMask
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; do corner 4 (opposing row, same col)
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+SWITCH_TO_MASKS copymasks4
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ldy y
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lda #23
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sec
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sbc row
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jsr HGRBlockCopyWithMask
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; reset y for looping
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ldy y
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@skip1
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iny
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sty y
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; now check if *this* column is visible
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bpl +
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- jmp @skip2
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+ cpy #40
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bcs -
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; do corner 1
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lda row
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jsr HGRBlockCopy
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; do corner 2
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lda #39
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sec
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sbc y
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tay
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lda #23
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sec
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sbc row
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jsr HGRBlockCopy
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; do corner 3
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lda #39
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sec
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sbc y
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tay
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lda row
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jsr HGRBlockCopy
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; do corner 4
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ldy y
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lda #23
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sec
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sbc row
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jsr HGRBlockCopy
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@skip2
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dec row
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bmi +
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jmp @rowloop
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+ lda $c000
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bmi @exit
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dec col
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dec counter
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beq @exit
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jmp @colloop
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@exit rts
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copymasks1
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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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!byte %10000000
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copymasks2
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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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!byte %10000000
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copymasks3
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!byte %10000000
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!byte %10000001
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!byte %10000011
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!byte %10000111
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!byte %10001111
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!byte %10011111
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!byte %10111111
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!byte %11111111
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copymasks4
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!byte %10000000
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!byte %11000000
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!byte %11100000
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!byte %11110000
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!byte %11111000
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!byte %11111100
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!byte %11111110
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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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