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re-add some deleted comments

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4am 2020-11-30 22:59:26 -05:00
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src/fx/fx.dhgr.48boxes.common.a
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@ -2,6 +2,72 @@
;(c) 2020 by 4am & qkumba
;
; The screen is separated into 48 boxes.
; Boxes are laid out in a grid, left-to-right, top-down:
;
; 0 1 2 3 4 5 6 7
; 8 9 10 11 12 13 14 15
; 16 17 18 19 20 21 22 23
; 24 25 26 27 28 29 30 31
; 32 33 34 35 36 37 38 39
; 40 41 42 43 44 45 46 47
;
; Each box is 70x32 pixels, so each row of each box is 5 consecutive
; bytes in main memory and another 5 in auxiliary memory, all of which
; are easy to find once you calculate the base address for that row.
;
; |BoxInitialStages| defines the initial grid of stages for each box.
; Each stage is used an index into the |StagesHi| array
; to find the drawing routine for that stage (if any).
; Each box's stage is incremented after each iteration through the main loop.
; When the main loop iterates through all 48 boxes without drawing anything,
; the program exits.
;
; There are 16 clear routines that set certain bits to 0 (black),
; labeled clear00..clear0F. clear00 clears the inner-most box, and
; clear0F clears the outermost box (see diagram).
; There are 16 copy routines that copy certain bits from the source
; image on page 2 to the destination image on page 1, labeled copy00..copy0F.
;
; row| pixels
; ---+---------------------------------------
; 00 |FFFFFFF|FFFFFFF|FFFFFFF|FFFFFFF|FFFFFFF
; 01 |FEEEEEE|EEEEEEE|EEEEEEE|EEEEEEE|EEEEEEF
; 02 |FEDDDDD|DDDDDDD|DDDDDDD|DDDDDDD|DDDDDEF
; 03 |FEDCCCC|CCCCCCC|CCCCCCC|CCCCCCC|CCCCDEF
; 04 |FEDCBBB|BBBBBBB|BBBBBBB|BBBBBBB|BBBCDEF
; 05 |FEDCBAA|AAAAAAA|AAAAAAA|AAAAAAA|AABCDEF
; 06 |FEDCBA9|9999999|9999999|9999999|9ABCDEF
; 07 |FEDCBA9|8888888|8888888|8888888|9ABCDEF
; ---+-------+-------+-------+-------+-------
; 08 |FEDCBA9|8777777|7777777|7777778|9ABCDEF
; 09 |FEDCBA9|8766666|6666666|6666678|9ABCDEF
; 0A |FEDCBA9|8765555|5555555|5555678|9ABCDEF
; 0B |FEDCBA9|8765444|4444444|4445678|9ABCDEF
; 0C |FEDCBA9|8765433|3333333|3345678|9ABCDEF
; 0D |FEDCBA9|8765432|2222222|2345678|9ABCDEF
; 0E |FEDCBA9|8765432|1111111|2345678|9ABCDEF
; 0F |FEDCBA9|8765432|1000001|2345678|9ABCDEF
; ---+-------+-------+-------+-------+-------
; 10 |FEDCBA9|8765432|1000001|2345678|9ABCDEF
; 11 |FEDCBA9|8765432|1111111|2345678|9ABCDEF
; 12 |FEDCBA9|8765432|2222222|2345678|9ABCDEF
; 13 |FEDCBA9|8765433|3333333|3345678|9ABCDEF
; 14 |FEDCBA9|8765444|4444444|4445678|9ABCDEF
; 15 |FEDCBA9|8765555|5555555|5555678|9ABCDEF
; 16 |FEDCBA9|8766666|6666666|6666678|9ABCDEF
; 17 |FEDCBA9|8777777|7777777|7777778|9ABCDEF
; ---+-------+-------+-------+-------+-------
; 18 |FEDCBA9|8888888|8888888|8888888|9ABCDEF
; 19 |FEDCBA9|9999999|9999999|9999999|9ABCDEF
; 1A |FEDCBAA|AAAAAAA|AAAAAAA|AAAAAAA|AABCDEF
; 1B |FEDCBBB|BBBBBBB|BBBBBBB|BBBBBBB|BBBCDEF
; 1C |FEDCCCC|CCCCCCC|CCCCCCC|CCCCCCC|CCCCDEF
; 1D |FEDDDDD|DDDDDDD|DDDDDDD|DDDDDDD|DDDDDEF
; 1E |FEEEEEE|EEEEEEE|EEEEEEE|EEEEEEE|EEEEEEF
; 1F |FFFFFFF|FFFFFFF|FFFFFFF|FFFFFFF|FFFFFFF
;
!ifndef USES_CLEAR {
; if an effect doesn't use any clear stages, you can reduce code size
; by setting USES_CLEAR=0 before including this file