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extreme_g:texture_banks
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Extreme-G Texture Bank Formats
Extreme-G's level GFX commands use textures from three bank types.
"Level" texture banks
This bank type contains CI8/CI4 textures that are unique to each level. Each bank of this type consists of two files referred to by the level header structures. The first file contains a table of texture meta data structures and the second file simply contains the texture data.
Texture meta data structure
| Offset | Description |
|---|---|
| 00 | 8-bit texture width |
| 01 | 8-bit texture height |
| 02 | 8-bit format ID (01 = CI8, 02 = CI4) |
| 03 | Padding byte |
| 04 | 32-bit offset of a texture's color index data |
| 08 | 32-bit offset of a texture's palette data |
Used by GFX command 02: "level_texture".
"Global" texture bank
This bank type contains CI8 textures that are shared between all levels. The global texture bank is stored LZHUF-compressed at 000C3400 in ROM.
High level structure
| Offset | Description |
|---|---|
| 00 | 32-bit offset pointing to a single palette at the end of the bank |
| 04 | 4 padding bytes |
| 08 | Texture meta data structure table |
| … | Texture color index data |
| … | 0x200 byte texture palette |
Texture meta data structure
| Offset | Description |
|---|---|
| 00 | 32-bit offset of a texture's color index data |
| 04 | 16-bit texture width |
| 06 | 16-bit texture height |
Used by GFX command 0C: "global_texture".
"Common" texture banks
This bank type contains CI8 textures that are shared between some levels. The structure of this bank type is the same as the “Global” texture bank's structure described above.
The ROM addresses of these banks are defined in LZHUF Table 00001450.
Used by GFX command 0D: "common_texture".
extreme_g/texture_banks.txt · Last modified: 2020/06/14 20:39 by shygoo