mirror of https://github.com/a2-4am/4cade.git
163 lines
3.4 KiB
Plaintext
163 lines
3.4 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/DHGR.DIAGONAL",plain
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*=$6000
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hgrlo = $0200 ; [$C0 bytes, main memory only]
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hgr1hi = $0300 ; [$C0 bytes, main memory only]
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copymasks= $02C0 ; [$08 bytes, different values in main and auxmem]
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!source "src/fx/macros.a"
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+COPY_TO_0 start, end
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;X=0
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+BUILD_HGR_LOOKUP_TABLES_X_IS_ALREADY_0 hgrlo, hgr1hi
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ldy #8 ; copy copymask arrays into place in main and auxmem
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- lda copymasks_main-1, y
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sta copymasks-1, y
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lda copymasks_aux-1, y
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sta $C005
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sta copymasks-1, y
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sta $C004
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dey
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bne -
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jmp loop
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;1GFEDCBA ->
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;1GGFFEED (main) +
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;1DCCBBAA (aux)
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copymasks_aux ; used in reverse order
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!byte %11111111
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!byte %11111100
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!byte %11110000
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!byte %11000000
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!byte %00000000
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!byte %00000000
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!byte %00000000
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!byte %00000000
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copymasks_main ; used in reverse order
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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 %11111110
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!byte %11111000
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!byte %11100000
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!byte %00000000
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start
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!pseudopc 0 {
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loop lda #23
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sta <row
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ldy <col
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jsr WaitForVBL
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rowloop lda <row
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asl
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asl
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asl
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tax
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lda hgrlo, x
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sta <src+1
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sta <dst+1
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lda hgr1hi, x
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sta <dst+2
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eor #$60
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sta <src+2
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cpy #40
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bcs +
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jsr DHGRBlockCopyWithMask
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+ iny
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cpy #40
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bcs +
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jsr DHGRBlockCopy
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+ dec <row
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bpl 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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bne loop
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exit jmp UnwaitForVBL
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DHGRBlockCopyWithMask
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; in: A = HGR row / 8 (0x00..0x17)
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; Y = HGR column (0x00..0x27)
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; mainmem banked in
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; out: Y preserved
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; A/X clobbered
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lda #$02
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sta <pass
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-- ldx #7
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clc
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- lda (<dst+1), y
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src eor $FDFD, y
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and copymasks, x
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eor (<dst+1), y
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dst sta $FDFD, y
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lda <src+2
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adc #$04
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sta <src+2
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eor #$60
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sta <dst+2
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dex
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bpl -
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lda <src+2
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sec
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sbc #$20
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sta <src+2
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eor #$60
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sta <dst+2
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sta $C003
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sta $C005
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dec <pass
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bne --
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sta $C002
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sta $C004
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rts
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DHGRBlockCopy
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-- ldx #7
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clc
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- lda (<src+1), y
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sta (<dst+1), y
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lda <src+2
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adc #$04
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sta <src+2
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eor #$60
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sta <dst+2
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dex
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bpl -
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lda <src+2
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sec
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sbc #$20
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sta <src+2
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eor #$60
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sta <dst+2
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sta $C003
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sta $C005
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ldx #7
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clc
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- lda (<src+1), y
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sta (<dst+1), y
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lda <src+2
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adc #$04
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sta <src+2
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eor #$60
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sta <dst+2
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dex
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bpl -
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sta $C002
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sta $C004
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rts
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row !byte 23
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col !byte 39
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counter !byte 64
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pass
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}
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end
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