Mother2GbaTranslation/m2-notes.txt

General notes
=============

Font palette:
- Standard text windows:     0x4 = background, 0xF = foreground
- File select/setup windows: 0x1 = background, 0x9 = foreground

Hard-coded characters:
- 0xFD: bullet (tile 0x1DD)
- 0xFE: equip (tile 0x1DE)
- Null (tile 0x1DF)
- Background (tile 0x1FF)

0x3000A00: Current PSI list when displaying a PSI window?
0x3000AA2: number of party members
0x3001D54: Ness items (16 bits each)
0x3001D70: Ness EXP
0x3001D80: Ness level
0x3001D84: Ness max HP
0x3001D86: Ness current HP
0x3001D8C: Ness max PP
0x3001D8E: Ness current PP
0x3001D94: Ailment?
           00: conscious
           01: unconscious
           02: diamondized
           03: paralyzed
           04: nauseous
           05: poisoned
           06: sunstroke
           07: sniffling
           08: mashroomized
           09: possessed
           0A: homesick
0x3001D95: Mashroomized flag?
0x3001D96: Sleep flag?
0x3001D97: Strange flag?
0x3001D98: Can't concentrate flag?
0x3001D99: Homesick flag?
0x3001DA3: Ness offense
0x3001DA4: Ness defense
0x3001DA5: Ness speed
0x3001DA6: Ness guts
0x3001DA7: Ness luck
0x3001DA8: Ness vitality
0x3001DA9: Ness IQ
0x3001F0C: Active party member flags
0x3001F6A: Ness PSI flags?
           0x01: Teleport alpha
           0x08: Teleport beta
0x3002500: buttons being pressed
0x30051EC: tile offset (usually 0x100)
0x3005224: menu depth
0x3005228: current text palette, << 0xC
0x3005230: addresses of all 11 windows
           [00]: A menu
           [01]: Money
           [02]: ?
           [03]: Action subject ("Who?", etc.)
           [04]: New equipment selection
           [05]: Offense/Defense
           [06]: Equip
           [07]: PSI list
           [08]: PSI classes
           [09]: PSI target/PP cost
           [0A]: PSI help
0x3005264: active window party member
0x3005270: address of tilemap start in WRAM, can use this to figure out X and Y

LDRB Rx,[Ry,#n]: n has range 0-31 (0x0-0x1F)
LDRH Rx,[Ry,#n]: n has range 0-62 (0x0-0x3E)
LDR Rx,[Ry,#n]: n has range 0-124 (0x0-0x7C) (0-1020 for SP- and PC-relative)

Custom WRAM: 2027FC0

Code sequences
--------------

80BAB64: draw and render PSI party target window
80C4C24: equip window renders four (None)s in a row
80C4F80: going left in equip window
80C4F84: going right in equip window

Subroutines
-----------

8001720: play sound effect r0
80B8AE0: draw PSI target/PP cost window with PSI index r0
80BD7AC: copy window buffer (primary/secondary)
         r0 = 0: copy from primary (2028A58) to secondary (2030A40)
         r0 = 1: copy from secondary to primary
80BD7AC: copy window buffer (primary/tertiary)
         r0 = 0: copy from primary (2028A58) to tertiary (2031248)
         r0 = 1: copy from tertiary to primary
80BE260: compute string pointer
         r0: pointer table
         r1: text base
         r2: index
80BE458: initialize window. If text pointer == 0, also draw window borders.
         r0: window pointer
         r1: text pointer
         r2: mystery halfword that gets copied to +0x2E
80BE4C8: initialize window. If text pointer == 0, also draw window borders.
         r0: window pointer
         r1: text pointer
         r2: mystery byte that gets copied to +0x42
         r3: mystery halfword that gets copied to +0x3E
         sp+0: mystery halfword that gets copied to +0x34 and +0x40 if the window enable flag is unset
80C0A5C: render numbers on status window
80C1FBC: draw PSI window for character r0
80C438C: check for cursor movements in PSI window
80C87D0: draw blank window and border (r0: window pointer)
80C8BE4: render main menu string to window r0
80C8FFC: render string to window r0
80C9634: render string (r1) to window (r0) at (x,y) (r2,r3)
80C96F0: render string (r1) to window (r0) at (x,2y) (r2,r3) using highlight [sp]
         (does not modify any window values)
80C980C: print next character (r0: window pointer)
80CA4BC: scroll text upwards (r0: window pointer)
80D2E94: print party character name
80D7154: count party members and store to 3000AA2
         then do some other stuff to the windows -- possibly drawing the HP/PP boxes?

Windows
-------

Window structure:
  0x00 - 0x03:  bitfield
    0x00000001: enable
    0x00000020: signals to redraw the window and borders (cleared by C87D0)
    0x0000FFDE: ?
    0xFFFF0000: we're stealing these for our hacks
      0x0007:   pixel X value
      0xFFF8:   unused
  0x04 - 0x07:  start address of text being displayed
  0x08 - 0x0B:  same as above?
  0x0C - 0x13:  unused?
  0x14 - 0x17:  text address offset
  0x18 - 0x1B:  ?
  0x1C - 0x1F:  ? (some kind of offset; used when printing nameable things?)
  0x20 - 0x21:  area (width*height)
  0x22 - 0x23:  window X (text area, not including border)
  0x24 - 0x25:  window Y
  0x26 - 0x27:  window width (tiles, not including border)
  0x28 - 0x29:  window height
  0x2A - 0x2B:  relative text X
  0x2C - 0x2D:  relative text Y
  0x2E - 0x33:  ?
  0x34 - 0x35:  cursor X
  0x36 - 0x37:  cursor Y
  0x38 - 0x43:  ?
  0x44:         ?
  0x45 - 0x4F:  ?