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This commit is contained in:
Peter Ferrie 2019-10-22 17:14:30 -07:00
parent f29f5d8500
commit 68fd1c6dda
1 changed files with 38 additions and 41 deletions
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79
src/fx/fx.hgr.precomputed.1bit.a
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@ -1,6 +1,10 @@
;license:MIT
;(c) 2019 by 4am
;
src3 = $E8 ; word
dest3 = $EA ; word
src4 = $EC ; word
dest4 = $EE ; word
src1 = $F0 ; word
dest1 = $F2 ; word
src2 = $F4 ; word
@ -104,7 +108,6 @@ InputLoop
ldy #0
lda (input),y ; first value: HGR row (only 0..95 will be in input array)
bmi Exit1 ; if > 127 then we're done
pha
tax
lda hgrlo,x
sta dest1
@ -113,22 +116,37 @@ InputLoop
sta dest1+1
eor #$60
sta src1+1
inx
lda hgrlo,x
lda hgrlo+1,x
sta dest2
sta src2
lda hgr1hi,x
lda hgr1hi+1,x
sta dest2+1
eor #$60
sta src2+1
lda mirror_rows,x
tax
lda hgrlo,x
sta dest3
sta src3
lda hgr1hi,x
sta dest3+1
eor #$60
sta src3+1
lda hgrlo-1,x
sta dest4
sta src4
lda hgr1hi-1,x
sta dest4+1
eor #$60
sta src4+1
iny
lda (input),y
pha
and #%00011111 ; second value: low 5 bits = byte offset within the row
tay
pla
and #%11100000 ; second value: high 3 bits = index into tables to find bitmasks
tax
eor (input),y ; second value: low 5 bits = byte offset within the row (implicitly "and #%00011111")
tay
; main 1x2 block in top-left quadrant
@ -172,64 +190,43 @@ InputLoop
; corresponding 1x2 block in bottom-right quadrant (opposite row, opposite column)
stx $00
pla
tax
lda mirror_rows,x
tax
lda hgrlo,x
sta dest1
sta src1
lda hgr1hi,x
sta dest1+1
eor #$60
sta src1+1
dex
lda hgrlo,x
sta dest2
sta src2
lda hgr1hi,x
sta dest2+1
eor #$60
sta src2+1
ldx $00
lda (dest1),y
lda (dest3),y
and mirror_sourcemasks,x
sta $00
lda (src1),y
lda (src3),y
; lda #$FF
and mirror_copymasks,x
ora $00
sta (dest1),y
lda (dest2),y
sta (dest3),y
lda (dest4),y
and mirror_sourcemasks,x
sta $00
lda (src2),y
lda (src4),y
; lda #$FF
and mirror_copymasks,x
ora $00
sta (dest2),y
sta (dest4),y
; corresponding 1x2 block in bottom-left quadrant (opposite row, original column)
lda mirror_cols,y
tay
lda (dest1),y
lda (dest3),y
and sourcemasks,x
sta $00
lda (src1),y
lda (src3),y
; lda #$FF
and copymasks,x
ora $00
sta (dest1),y
lda (dest2),y
sta (dest3),y
lda (dest4),y
and sourcemasks,x
sta $00
lda (src2),y
lda (src4),y
; lda #$FF
and copymasks,x
ora $00
sta (dest2),y
sta (dest4),y
bit $c000
bmi Exit2