mirror of https://github.com/a2-4am/4cade.git
95 lines
2.8 KiB
Plaintext
95 lines
2.8 KiB
Plaintext
;license:MIT
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;(c) 2019-2022 by 4am
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;
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evenrow_ptr = $E4 ; word
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oddrow_ptr = $E6 ; word
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mirror_src1 = $E8 ; word
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mirror_dest1 = $EA ; word
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mirror_src2 = $EC ; word
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mirror_dest2 = $EE ; word
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src1 = $F0 ; word
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dest1 = $F2 ; word
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src2 = $F4 ; word
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dest2 = $F6 ; word
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reverse_input = $FC ; word
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input = $FE ; word
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+BUILD_DITHER_MASKS dithermasks
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+BUILD_MIRROR_COLS mirror_cols
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+BUILD_HGR_LOOKUP_TABLES hgrlo, hgr1hi
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+BUILD_HGR_MIRROR_LOOKUP_TABLES hgrlomirror, hgr1himirror
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+BUILD_SPARSE_BITMASKS_1BIT
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+LDADDR evenrow_masks
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+ST16 evenrow_ptr
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+LDADDR oddrow_masks
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+ST16 oddrow_ptr
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jsr FullRadial
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bit KBD
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bmi Exit
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lda #<no_masks
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sta <evenrow_ptr
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sta <oddrow_ptr
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; /!\ execution falls through here
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FullRadial
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+LDADDR Coordinates
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+ST16 input
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+LDADDR EndCoordinates-2
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+ST16 reverse_input
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+HIDE_NEXT_BYTE
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Exit rts
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Loop ldy #0
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lda (input),y
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bmi Exit
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tax
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+ROW_X_TO_BASE_ADDRESSES
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+ROW_X_TO_MIRROR_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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; top-left quadrant (original row, original column, original input order)
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+COPY_BIT_DITHER src1, dest1, copymasks, evenrow_ptr
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+COPY_BIT_DITHER src2, dest2, copymasks, oddrow_ptr
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; bottom-right quadrant (opposite row, opposite column, original input order)
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lda mirror_cols,y
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tay
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+COPY_BIT_DITHER mirror_src1, mirror_dest1, mirror_copymasks, oddrow_ptr
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+COPY_BIT_DITHER mirror_src2, mirror_dest2, mirror_copymasks, evenrow_ptr
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ldy #0
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lda (reverse_input),y
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tax
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+ROW_X_TO_BASE_ADDRESSES
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+ROW_X_TO_MIRROR_ADDRESSES
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iny
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lda (reverse_input),y
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+HIGH_3_LOW_5 reverse_input
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; bottom-left quadrant (opposite row, original column, reverse input order)
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+COPY_BIT_DITHER mirror_src1, mirror_dest1, copymasks, oddrow_ptr
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+COPY_BIT_DITHER mirror_src2, mirror_dest2, copymasks, evenrow_ptr
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; top-right quadrant (same row, opposite column, reverse input order)
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lda mirror_cols,y
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tay
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+COPY_BIT_DITHER src1, dest1, mirror_copymasks, evenrow_ptr
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+COPY_BIT_DITHER src2, dest2, mirror_copymasks, oddrow_ptr
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inc input
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bne +
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inc input+1
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+ lda reverse_input
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php
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dec reverse_input
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dec reverse_input
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plp
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bne +
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dec reverse_input+1
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bit $c000
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bmi ++
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+ jmp Loop
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++ rts
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