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Table of Contents
Geometry Layout Commands
The geometry layout commands define how geometric shapes are drawn. Some geo layouts are contained after the Level data blocks and some are loaded with Level Command 0x17 The first byte of the geo layout command is the command type. Unlike the level commands, there is no length byte specified in the command. Most geo layout commands are constant length, however, some depend on the values set.
Drawing Layers
| Layer | Description |
|---|---|
| 00 | Unused |
| 01 | Entirely Solid |
| 02 | Unused |
| 03 | Unused |
| 04 | Transparent pixels, no semi transparency. Allows perfect layering with other transparencies around it. |
| 05 | Semi transparency enabled. Layering must be handled with the order of drawn faces. |
| 06 | Semi transparency enabled. Layering must be handled with the order of drawn faces. This layer is always drawn behind layer 05, usually for shadows. |
Geometry Layout Commands
00: Branch and Store
Branches to segmented address and stores 2 return addresses. This command is not used in the ROM.
00 00 00 00 [SS SS SS SS]
| S | Segmented address to branch to |
/* Geo Layout 0x00 Rough translation. */ // 0x8038BD80 = Pointer to current Geo layout command // 0x8038BCB8 = Pointer to array/table to where branch return pointers are stored. // 0x8038BD7A = Branch depth value. *(0x8038BCB8 + (0x8038BD7A * 4)) = *0x8038BD80 + 8; // Stores the pointer to the next geo command *0x8038BD7A += 1; // Increment branch value *(0x8038BCB8 + (0x8038BD7A * 4)) = (*0x8038BD78 << 16) + *0x8038BD7E; // Store another address *0x8038BD7A += 1; // Increment branch value *0x8038BD7E = *0x8038BD7A; 0x8038BD80 = SegmentedToVirtual(0x8038BD80 + 4); // Go to the segmented address.
Length: 8
01: Terminate Geometry Layout
The ending command to close.
01 00 00 00
Length: 4
02: Branch Geometry Layout
Branches the current geo layout to another area within a RAM bank.
02 [AA] 00 00 [SS SS SS SS]
| A | 0 = Jump, 1 = Jump and store return address |
| S | Segmented address to branch to |
Length: 8
03: Return From Branch
Ends the current geometry layout branch and returns to the area following the 0x02 command.
03 00 00 00
Length: 4
04: Open Node
If you don't understand nodes, this is basically like a sub-folder.
04 00 00 00
Length: 4
05: Close Node
Used at the end of the data within the opened node.
05 00 00 00
Length: 4
06: Unused
07: Unused
08: Set Screen Render Area
Only used in geo layout of levels.
08 00 00 [AA] [XX XX] [YY YY] [WW WW] [HH HH]
| A | Either 00 (mario face) or 0A (all other levels) |
| X | X position |
| Y | Y position |
| W | Width of screen |
| H | Height of screen |
Length: C
09: ??
Only used in geo layout of levels.
09 00 00 [AA]
| A | Always 0x64 |
Length: 4
0A: Set Camera Frustum
Set camera frustum properties. Only used in geo layout of levels.
0A [AA] [BB BB] [NN NN] [FF FF] {EE EE EE EE}
| A | Use ASM code defined by E |
| B | Camera FOV (0x2D = 45) |
| N | Camera Near |
| F | Camera Far |
| E | optional ASM function if A is non-zero (always 8029AA3C) |
Length: 8-C (variable)
0B: Start Geo Layout
Starts geometry layout with no parameters whatsoever. Seems to use a pre-set render area.
0B 00 00 00
Length: 4
0C: ??
Used mostly in levels
0C [AA] 00 00
| A | Either 00 or 01, passed to A2 of 8037B4AC |
Length: 4
0D: ??
Used in WF, CCM, TTM, SSL levels and some geo layouts.
0D 00 00 00 [AA AA] [BB BB]
| A | s16?, passed through A2 to 8037B530 |
| B | s16? passed through A3 to 8037B530 |
Length: 8
0E: Switch Case
Loads ASM in RAM that switches between the receding display lists within the node.
0E 00 00 [NN] [AA AA AA AA]
| N | Number of cases/display lists, starting at 01 |
| A | ASM Function |
Length: 8
0F: ??
0F 00 [TT TT] [XX XX] [YY YY] [ZZ ZZ] [UU UU] [VV VV] [WW WW] [AA AA AA AA]
| T | ?? |
| X | ?? (s16) |
| Y | ?? (s16) |
| Z | ?? (s16) |
| U | ?? (s16) |
| V | ?? (s16) |
| W | ?? (s16) |
| A | ASM function. Always 80287D30 (levels) or 00 (menus) |
Length: 0x14
10: Translate and Rotate
Applies translation & rotation to the following node.
10 [AA] [BB BB] [XX XX] [YY YY] [ZZ ZZ] [RX RX] [RY RY] [RZ RZ]
| A | Branching flag |
| B | Used if A != 0 |
| X | X translation offset (s16) |
| Y | Y translation offset (s16) |
| Z | Z translation offset (s16) |
| RX | X rotation (s16) |
| RY | Y rotation (s16) |
| RZ | Z rotation (s16) |
Length: 0x10
13: Load Display List
Loads display list with drawing layer and offsets the model on X/Y/Z axis.
13 [LL] [XX XX] [YY YY] [ZZ ZZ] [AA AA AA AA]
| L | Drawing layer |
| X | Offset on X axis (s16) |
| Y | Offset on Y axis (s16) |
| Z | Offset on Z axis (s16) |
| A |
