Texture Resource (OTEX)

If the Resource Type is OTEX (0x4F544558), the header is immediately followed by the texture definition.

Texture Header

Offset	Size	Type	Description
0x40	4	u32	Texture Type ID
0x44	4	u32	Width
0x48	4	u32	Height
0x4C	4	u32	Data Size
0x50	...	[u8]	Raw Texture Data

Texture Types

ID	Name	Bits Per Pixel	Description
0	Error	-	Invalid / Error
1	RGBA32bpp	32	Red, Green, Blue, Alpha (8 bits each)
2	RGBA16bpp	16	RGBA 5-5-5-1
3	Palette4bpp	4	4-bit Color Index (CI4)
4	Palette8bpp	8	8-bit Color Index (CI8)
5	Grayscale4bpp	4	4-bit Intensity (I4)
6	Grayscale8bpp	8	8-bit Intensity (I8)
7	GrayscaleAlpha4bpp	4	4-bit Intensity with Alpha (IA4)
8	GrayscaleAlpha8bpp	8	8-bit Intensity with Alpha (IA8)
9	GrayscaleAlpha16bpp	16	16-bit Intensity with Alpha (IA16)
10	GrayscaleAlpha1bpp	1	1-bit Black/White (I1)
11	TLUT	-	Texture Look-Up Table (Palette)

Note: When a TLUT is exported to an OTR file, its type is converted to RGBA16bpp (ID 2).

YAML Configuration

When defining textures in the asset configuration, the following format strings are supported:

Format String	Texture Type	Bit Depth
rgba16	RGBA16bpp	16
rgba32	RGBA32bpp	32
ci4	Palette4bpp	4
ci8	Palette8bpp	8
i4	Grayscale4bpp	4
i8	Grayscale8bpp	8
ia1	GrayscaleAlpha1bpp	1
ia4	GrayscaleAlpha4bpp	4
ia8	GrayscaleAlpha8bpp	8
ia16	GrayscaleAlpha16bpp	16
tlut	TLUT	16

Paletted Textures (CI4 / CI8)

For paletted textures (ci4 or ci8), you can optionally define the accompanying TLUT within the same entry. If tlut (offset) and colors (count) are provided, Torch will automatically generate a separate TLUT asset.

You can also specify tlut_symbol to explicitly name the generated TLUT asset. If omitted, it defaults to the texture symbol with _tlut appended.

Example:

- type: TEXTURE
  format: ci8
  width: 32
  height: 32
  offset: 0x12345
  tlut: 0x12545
  colors: 256
  tlut_symbol: my_custom_tlut_name # Optional

This will create the texture asset and a separate TLUT asset.