;license:MIT
;(c) 2019 by 4am
;
!cpu 6502
!to "build/FX/LATTICE",plain
*=$6000

maskindex = $fc
rowcount = $fd
row = $fe
col = $ff

         !source "src/fx/macros.a"

         lda   #5
         sta   maskindex
MaskLoop
         ldx   maskindex
         lda   even_maskslo,x
         sta   EvenMask
         lda   even_maskshi,x
         sta   EvenMask+1
         lda   odd_maskslo,x
         sta   OddMask
         lda   odd_maskshi,x
         sta   OddMask+1
         lda   #0
         sta   row
         lda   #23
         sta   rowcount
         jsr   WaitForVBL
RowLoop
         lda   row
         +HGR_ROW_CALC
         lda   #39
         sta   col
ColLoop
         ldy   col
         tya
         eor   row
         and   #1
         bne   Odd
         clc
         ldx   #7
-        lda   ($3c),y
         eor   ($26),y
EvenMask=*+1
         and   $FDFD,x
         eor   ($26),y
         sta   ($26),y
         +HGR_INC_WITHIN_BLOCK
         dex
         bpl   -
         bmi   NextCol
Odd
         clc
         ldx   #7
-        lda   ($3c),y
         eor   ($26),y
OddMask=*+1
         and   $FDFD,x
         eor   ($26),y
         sta   ($26),y
         +HGR_INC_WITHIN_BLOCK
         dex
         bpl   -
NextCol
         +RESET_HGR_CALC
         dec   col
         +LBPL ColLoop
         inc   row
         dec   rowcount
         +LBPL RowLoop
         bit   $c000
         bmi   Exit
         dec   maskindex
         +LBPL MaskLoop
Exit     jmp   UnwaitForVBL

even_maskslo
         !byte <copymask_even6
         !byte <copymask_even5
         !byte <copymask_even4
         !byte <copymask_even3
         !byte <copymask_even2
         !byte <copymask_even1
even_maskshi
         !byte >copymask_even6
         !byte >copymask_even5
         !byte >copymask_even4
         !byte >copymask_even3
         !byte >copymask_even2
         !byte >copymask_even1

odd_maskslo
         !byte <copymask_odd6
         !byte <copymask_odd5
         !byte <copymask_odd4
         !byte <copymask_odd3
         !byte <copymask_odd2
         !byte <copymask_odd1
odd_maskshi
         !byte >copymask_odd6
         !byte >copymask_odd5
         !byte >copymask_odd4
         !byte >copymask_odd3
         !byte >copymask_odd2
         !byte >copymask_odd1

copymask_even1
         !byte %11100000
         !byte %10110000
         !byte %10011000
         !byte %10011000
         !byte %10001100
         !byte %10000110
         !byte %10000011
         !byte %10000001
copymask_odd1
         !byte %10000001
         !byte %10000011
         !byte %10000110
         !byte %10001100
         !byte %10011000
         !byte %10011000
         !byte %10110000
         !byte %11100000
copymask_even2
         !byte %11110000
         !byte %10111000
         !byte %10011100
         !byte %10011100
         !byte %10001110
         !byte %10000111
         !byte %11000011
         !byte %11100001
copymask_odd2
         !byte %11100001
         !byte %11000011
         !byte %10000111
         !byte %10001110
         !byte %10011100
         !byte %10011100
         !byte %10111000
         !byte %11110000
copymask_even3
         !byte %11110001
         !byte %11111000
         !byte %10111100
         !byte %10111100
         !byte %10011110
         !byte %10001111
         !byte %11000111
         !byte %11100011
copymask_odd3
         !byte %11100011
         !byte %11000111
         !byte %10001111
         !byte %10011110
         !byte %10111100
         !byte %10111100
         !byte %11111000
         !byte %11110001
copymask_even4
         !byte %11111001
         !byte %11111100
         !byte %10111110
         !byte %10111110
         !byte %10011111
         !byte %11001111
         !byte %11100111
         !byte %11110011
copymask_odd4
         !byte %11110011
         !byte %11100111
         !byte %11001111
         !byte %10011111
         !byte %10111110
         !byte %10111110
         !byte %11111100
         !byte %11111001
copymask_even5
         !byte %11111011
         !byte %11111101
         !byte %11111110
         !byte %11111110
         !byte %10111111
         !byte %11011111
         !byte %11101111
         !byte %11110111
copymask_odd5
         !byte %11110111
         !byte %11101111
         !byte %11011111
         !byte %10111111
         !byte %11111110
         !byte %11111110
         !byte %11111101
         !byte %11111011
copymask_even6
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
copymask_odd6
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111
         !byte %11111111

         !source "src/wait.a"
         !source "src/fx/fx.hgr.common.a"
         !source "src/fx/hw.vbl.a"