Mother 3/Map info table

Map info table
Game	MOTHER 3
Start Address	0xD2E1D8
End Address	0xD34F43
# of Entries	1000 (0x3E8)
Entry Length	28 bytes (0x1C)
Total Length	28012 bytes (0x6D6C)
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Overview

This table contains map layer dimensions and alpha values. The table has a 12-byte dummy header that can be ignored (but should be left untouched).

Field listing

• 00-03 (04) = [ A ] Bitfield
  • 0x0000003C = Alpha 1
  • 0x000003C0 = Alpha 2
  • 0xFFFFFC03 = Unclassified data
• 04-0F (0C) = Unclassified data
• 10-13 (04) = [ B ] Layer 1 info
• 14-17 (04) = [ C ] Layer 2 info
• 18-1B (04) = [ D ] Layer 3 info

Table view

       00   01   02   03   04   05   06   07   08   09   0A   0B   0C   0D   0E   0F
    +--------------------------------------------------------------------------------
00  | [        A        ] [                            ?                            ]
10  | [        B        ] [        C        ] [        D        ]

Alpha

It's unknown exactly how these values work, but they do influence how the map layers blend together; for example, the 'spotlight' layers in the Drago Plateau caves (maps 462-464) have special values.

Layer info

Each map has three layers. The 4-byte layer info includes the dimensions of each respective layer.

• 00-00 (01) = Bitfield
  • 0x07 = (Width - 1), in units of 16 tiles (units of 256 pixels)
  • 0x38 = (Height - 1), in units of 16 tiles (units of 256 pixels)
  • 0xC0 = Unclassified data
• 01-03 (03) = Unclassified data