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https://github.com/a2-4am/4cade.git
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132 lines
3.0 KiB
Plaintext
132 lines
3.0 KiB
Plaintext
;license:MIT
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;(c) 2019-2020 by 4am
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;
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!source "src/fx/fx.hgr.precomputed.2bit.a"
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!source "src/fx/fx.dhgr.common.a"
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!macro BUILD_SPARSE_BITMASKS_2BIT_DHGR .copymasks, .mirror_copymasks {
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; build sparse lookup tables for bitmasks
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ldx #$00
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txa
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- sta .copymasks, x
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sta $C005
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sta .copymasks, x
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sta $C004
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inx
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bne -
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lda #%10011111
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sta .copymasks+$40
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sta .mirror_copymasks+$A0
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lda #%11100000
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sta .copymasks+$60
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sta .mirror_copymasks+$80
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lda #%10000111
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sta .copymasks+$C0
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sta .mirror_copymasks+$20
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lda #%11111000
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sta .copymasks+$E0
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sta .mirror_copymasks
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sta $C005
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lda #%10001111
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sta .copymasks
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sta .mirror_copymasks+$E0
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lda #%11110000
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sta .copymasks+$20
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sta .mirror_copymasks+$C0
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lda #%10000011
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sta .copymasks+$80
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sta .mirror_copymasks+$60
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lda #%11111100
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sta .copymasks+$A0
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sta .mirror_copymasks+$40
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sta $C004
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}
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!macro FX_PRECOMPUTED_2BIT_DHGR .coords {
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+BUILD_SPARSE_BITMASKS_2BIT_DHGR copymasks, mirror_copymasks
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+BUILD_HGR_LOOKUP_TABLES_X_IS_ALREADY_0 hgrlo, hgr1hi
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+BUILD_MIRROR_COLS mirror_cols
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+COPY_SELF_TO_AUXMEM
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+COPY_TO_0 start, end
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jmp InputLoop
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start
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!pseudopc 0 {
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Exit2Bit rts
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InputLoop
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ldy #0
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input=*+1
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ldx .coords ; first value: HGR row + 1
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beq Exit2Bit ; if 0 then we're done
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+ROW_X_TO_2BIT_BASE_ADDRESSES
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inc <input
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lda (<input), y
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+HIGH_3_LOW_5 input
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; main 2x2 block in left half
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clc
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- lda copymasks, x
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beq +
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src1=*+1
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lda $FDFD, y
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eor (<dest1), y
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and copymasks, x
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eor (<dest1), y
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dest1=*+1
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sta $FDFD, y
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src2=*+1
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lda $FDFD, y
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eor (<dest2), y
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and copymasks, x
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eor (<dest2), y
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dest2=*+1
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sta $FDFD, y
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+ bcs +
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sta $C003
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sta $C005
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sec
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bcs -
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+ sta $C002
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sta $C004
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; corresponding 2x2 block in right half (same row, opposite column)
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lda mirror_cols, y
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tay
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clc
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- lda mirror_copymasks, x
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beq +
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+COPY_BIT src1, dest1, mirror_copymasks
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+COPY_BIT src2, dest2, mirror_copymasks
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+ bcs +
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sta $C003
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sta $C005
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sec
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bcs -
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+ sta $C002
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sta $C004
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inc <input
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+LBNE InputLoop
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bit $c000
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bmi +
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inc <input+1
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jmp InputLoop
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+ rts
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}
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end
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!if * and 1 {
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!byte 0 ;align 2 but avoids the fake allocation bug if it was aligned already
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}
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}
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