Behaviour Documentation

########################################################
#
#BG_chk (behaviour/collisions)
#    {
#        char ?
#        char ?
#        char ?
#        char ?
#        char ?
#        char ?
#        char ?
#        char ?
#    }
#
#
#BG_unt (objects)
#    { (Tiles)
#        char bitfield (0000 0001 == X repeat, 0000 0010 == Y Repeat, 
#                       0000 0011 == Both repeat, 1000 0000 == Slope flag)
#        char tilenumber
#        char bitfield (bottom two bits are tileset number, rest is a parameter)
#    }
#    { (Slope)
#        char (bitfield. 0x1 = Swap directions X
#                        0x2 = Swap directions y (and swap slope blocks)
#                        0x4 = Unknown
#                        0x8 = Unknown
#                        0x10 = Unknown
#                        0x20 = "  "
#                        0x40 = "  "
#                        0x80 = Slope Flag
#    }
#    { (other crud)
#        char (0xFE linefeed for each tile row)
#        char (0xFF end of object)
#    }
#    
#
#    _hd (metadata)
#    {
#        short offset
#        char height
#        char width
#    }
#
########################################################




All used values of BG_chk:

Byte 0: (missing 0x1, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80)
0x0
0x2          Used for Ice Walls. Meltable?


Byte 1: (missing 0x4, 0x20, 0x40, 0x80)
0x0
0x1          Pipe Flag
0x2          Falling Block Flag (Donut Blocks)
0x8          Steep Ledges (shimmying/hanging)
0x10         Fake Block? (Pa1_obake)


Byte 2: (missing 0x1, 0x2, 0x40)
0x0
0x4          Climbing Grid Flag
0x8          Partial Solid Flag
0x10         Spike Flag
0x20         Pass-Down (Solid-on-Bottom)
0x80         Pass-Through (Solid-on-Top)


Byte 3: (missing 0x80)
0x0          
0x1          Full-Solid
0x2          Coin
0x4          Question Block
0x8          Explodable Block
0x10         Breakable
0x20         Slope
0x40         Flipped Slope


Byte 4:
0x0


Byte 5:
0x0
0x1         Icy Ground Flag A (Penguin Sliding? Slipping?)
0x2         Icy Ground Flag B (Penguin Sliding? Slipping?)
0x3         Quicksand Flag (Gets Replaced w/ Quicksand)
0x4         Conveyor Belt (Left/Right?, Fast/Slow?)
0x5         Conveyor Belt (Left/Right?, Fast/Slow?)
0x6         Horizontal Climbing Rope/Pole
0x7         Half Spike Terrain Flag (Test more)
0x8         Ledge Terrain Flag
0x9         Vertical Climbing Pole
0xa         Staircase Terrain Flag (No sliding?)
0xb         Carpet Terrain Flag
0xc         Dusty Terrain Flag
0xd         Grass Terrain Flag
0xf         Beach Sand Terrain Flag
         

Byte 6:
0x0
0x2         Green Large Pipe
0x6         Red Large Pipe
0xa         Yellow Large Pipe


Byte 7:     (No Flag - mostly Rails)
0x0         
0x1         1/1 Diagonal Rail Upslope
0x2         1/1 Diagonal Rail Downslope
0x3         90° Corner Fill
0x4         90° Rail Corner
0x5         Straight Horizontal Rail
0x6         Straight Vertical Rail
0x7         ???
0x8         2/2 Gentle Rail Upslope
0x9         1/2 Gentle Rail Upslope
0xa         2/2 Gentle Rail Downslope
0xb         1/2 Gentle Rail Downslope
0xc         2/2 Steep Rail Upslope
0xd         1/2 Steep Rail Upslope
0xe         2/2 Steep Rail Downslope
0xf         1/2 Steep Rail Downslope
0x10         1 Panel Circle
0x11         2x2 Circle UR
0x12         2x2 Circel UL
0x13         2x2 Circle LR
0x14         2x2 Circle LL
0x15         4x4 Circle 1 (UL)
0x16         4x4 Circle 2
0x17         4x4 Circle 3
0x18         4x4 Circle 4 (UR)
0x19         4x4 Circle 5 (L)
0x1a         4x4 Circle 6 (R)
0x1b         4x4 Circle 7 (L)
0x1c         4x4 Circle 8 (R)
0x1d         4x4 Circle 9 (LL)
0x1e         4x4 Circle 10
0x1f         4x4 Circle 11
0x20         4x4 Circle 12 (LR)
0x22         Rail Stops
0x23         Beanstalk Stopper
0x28         Coin Outline
0x35         Coin Battle Coin
0x36         Red Block Outline
0x37         Red Block Outline
0x38         Cave Entrance Right
0x39         Cave Entrance Left
0x3b         Unused in Game (nohara)


Byte 7:     (Climable Grid Flag)
0x1         Generic Climbing
0x2         Upper Left Corner
0x3         Upper Side
0x4         Upper Right Corner
0x5         Left Side
0x6         Center
0x7         Right Side
0x8         Lower Left Corner
0x9         Lower Side
0xa         Lower Right Corner


Byte 7:     (Coin Flag)
0x0         Generic Coin
0x1         
0x2         
0x3         
0x4         Pow Block Coin
0x5         
0x6         
0x7         
0x8         
0x9         
0xa         
0xb         
0xc         
0xd         
0xe         
0xf         


Byte 7:     (Explodable Block Flag)
0x0         
0x1         Stone Block (shards?)
0x2         Wooden Block (shards?)
0x3         Red Block (shards?)
0x4         
0x5         
0x6         



Byte 7:     (pipe flag)
0x0         Vert. Top Entrance Left
0x1         Vert. Top Entrance Right
0x2         Vert. Bottom Entrance Left
0x3         Vert. Bottom Entrance Right
0x4         Vert. Center Left
0x5         Vert. Center Right
0x6         Vert. On Top Junction Left
0x7         Vert. On Top Junction Right
0x8         Horiz. Left Entrance Top
0x9         Horiz. Left Entrance Bottom
0xa         Horiz. Right Entrance Top
0xb         Horiz. Right Entrance Bottom
0xc         Horiz. Center Left
0xd         Horiz. Center Right
0xe         Horiz. On Top Junction Top
0xf         Horiz. On Top Junction Bottom
0x10         Vert. Mini Pipe Top
0x11         
0x12         Vert. Mini Pipe Bottom
0x13         
0x14         
0x15         
0x16         Vert. On Top Mini-Junction
0x17         
0x18         Horiz. Mini Pipe Left
0x19         
0x1a         Horiz. Mini Pipe Right
0x1b         
0x1c         Vert. Mini Pipe Center
0x1d         Horiz. Mini Pipe Center
0x1e         Horiz. On Top Mini-Junction
0x1f         Block Covered Corner



Byte 7:     (Question Block Flag)
0x0         FireFlower
0x1         Star
0x2         Coin Block
0x3         Vine
0x4         1-up
0x5         Mini-Mushroom
0x6         Propellor Mushroom
0x7         Penguin Suit
0x8         Ice Flower
0x9         
0xa         
0xb         
0xc         
0xd         
0xe         
0xf         


Byte 7:     (Partial Solids)
0x0         
0x1         Upper Left
0x2         Upper Right
0x3         Top Half
0x4         Lower Left
0x5         Left Half
0x6         Diagonal Upwards
0x7         Upper Left 3/4
0x8         Lower Right
0x9         Diagonal Downwards
0xa         Right Half
0xb         Upper Right 3/4
0xc         Lower Half
0xd         Lower Left 3/4
0xe         Lower Right 3/4
0xf         Full Brick



Byte 7:     (slope flag)
0x0         1/1 Upslope (Null without Byte 3 = 0x20)
0x1         1/1 Downslope
0x2         1/2 Upslope
0x3         2/2 Upslope
0x4         1/2 Downslope
0x5         2/2 Downslope
0x6         
0x7         
0x8         
0x9         
0xa         Slope Edge (Solid Slope)
0xb         1/4 Upslope
0xc         2/4 Upslope
0xd         3/4 Upslope
0xe         4/4 Upslope
0xf         1/4 Downslope
0x10         2/4 Downslope
0x11         3/4 Downslope
0x12         4/4 Downslope
0x13         
0x14         
0x15         
0x16         
0x17         
0x18         
0x19         
0x1a         
0x1b         
0x1c         
0x1d         
0x1e         
0x1f         



Byte 7:     (Spike Flag)
0x0         2/1 Spikes Left
0x1         2/1 Spikes Right
0x2         2/1 Spikes Up
0x3         2/1 Spikes Down
0x4         1/2 Spike Downwards   \/
0x5         2/2 Spike Downwards  \  /
0x6         1/1 Spike Downwards
0x7         
0x8         
0x9         
0xa         
0xb         
0xc         
0xd         
0xe         
0xf         



Byte 7:     (Conveyor Belt Flag)
0x0         ???
0x1         ???
0x2         ???
0x3         ???




All used values of BG_unt:


Upperslope:
0x0
0x90    
0x92
0x93
0x91

Possible bits - 0x80 (slope flag), 0x10, 0x02, 0x01



Lowerslope:
0x0
0x84

Possible bits - 0x80 (slope flag), 0x04



First Byte:
0x0  -  does not tile, which means it tiles fine
0x1  -  only useful for setting X stretch.
0x2  -  only useful for setting Y stretch.
0x3  -  only useful for setting X/Y stretch.
0x4  -  set for the subblock of a slope


Last Byte:
0x0
0x1
0x2
0x3
0x4
0x8
0xc
0x10
0x14
0x18
0x1c
0x20
0x24
0x28
0x2c
0x30

Possible bits - 0x01, 0x02, 0x04, 0x08, 0x10, 0x20
Bits 0x01 and 0x02 are tileset number