mirror of
https://github.com/a2-4am/4cade.git
synced 2024-11-15 07:07:04 +00:00
65 lines
1.9 KiB
Plaintext
65 lines
1.9 KiB
Plaintext
|
+BUILD_HGR_LOOKUP_TABLES hgrlo, hgr1hi
|
||
|
|
+BUILD_HGR_MIRROR_LOOKUP_TABLES hgrlomirror, hgr1himirror
|
||
|
|
+BUILD_MIRROR_COLS mirror_cols
|
||
|
|
+BUILD_SPARSE_BITMASKS copymasks, mirror_copymasks
|
||
|
|
+LDADDR Coordinates
|
||
|
|
+STAY input
|
||
|
|
+LDADDR EndCoordinates-2
|
||
|
|
+STAY reverse_input
|
||
|
|
jmp Loop
|
||
|
|
Exit rts
|
||
|
|
Loop ldy #0
|
||
|
|
lda (input),y
|
||
|
|
bmi Exit
|
||
|
|
tax
|
||
|
|
+ROW_X_TO_BASE_ADDRESSES
|
||
|
|
+ROW_X_TO_MIRROR_ADDRESSES
|
||
|
|
inc input
|
||
|
|
lda (input),y
|
||
|
|
+HIGH_3_LOW_5 input
|
||
|
|
|
||
|
|
; top-left quadrant (original row, original column, original input order)
|
||
|
|
+COPY_BIT src1, dest1, copymasks
|
||
|
|
+COPY_BIT src2, dest2, copymasks
|
||
|
|
|
||
|
|
; bottom-right quadrant (opposite row, opposite column, original input order)
|
||
|
|
lda mirror_cols,y
|
||
|
|
tay
|
||
|
|
+COPY_BIT mirror_src1, mirror_dest1, mirror_copymasks
|
||
|
|
+COPY_BIT mirror_src2, mirror_dest2, mirror_copymasks
|
||
|
|
|
||
|
|
ldy #0
|
||
|
|
lda (reverse_input),y
|
||
|
|
tax
|
||
|
|
+ROW_X_TO_BASE_ADDRESSES
|
||
|
|
+ROW_X_TO_MIRROR_ADDRESSES
|
||
|
|
iny
|
||
|
|
lda (reverse_input),y
|
||
|
|
+HIGH_3_LOW_5 reverse_input
|
||
|
|
|
||
|
|
; bottom-left quadrant (opposite row, original column, reverse input order)
|
||
|
|
+COPY_BIT mirror_src1, mirror_dest1, copymasks
|
||
|
|
+COPY_BIT mirror_src2, mirror_dest2, copymasks
|
||
|
|
|
||
|
|
; top-right quadrant (same row, opposite column, reverse input order)
|
||
|
|
lda mirror_cols,y
|
||
|
|
tay
|
||
|
|
+COPY_BIT src1, dest1, mirror_copymasks
|
||
|
|
+COPY_BIT src2, dest2, mirror_copymasks
|
||
|
|
|
||
|
|
inc input
|
||
|
|
bne +
|
||
|
|
inc input+1
|
||
|
|
+ lda reverse_input
|
||
|
|
beq +
|
||
|
|
dec reverse_input
|
||
|
|
dec reverse_input
|
||
|
|
jmp Loop
|
||
|
|
+ dec reverse_input
|
||
|
|
dec reverse_input
|
||
|
|
dec reverse_input+1
|
||
|
|
bit $c000
|
||
|
|
bmi +
|
||
|
|
jmp Loop
|
||
|
|
+ rts
|