Textures (.texture)

Insomniac engineTexturesApplies toSunset

A .texture is stored as two assets with the same id. The SD asset (span 0) is a wrapper, a DAT1 with one section and the standard-definition pixels after it; the optional HD stream (span 1, Built Type stream in layout.csv) holds only the extra high-resolution mips with no wrapper or DAT1. The pixels are DDS-ordered mip chains. Observed

The 52,624 named texture assets are 42,841 span-0 textures and 9,783 span-1 HD streams; ALERT reports 42,840. 28,916 of the 42,841 are levels/.../envprobes/*.texture, leaving 13,925 other textures. Observed These figures are from a recorded census of the PC build 3373500; the install is no longer available. Observed

The only section of a span-0 texture is 4EDE3593, 36 bytes (present in 42,841 of 42,841): Observed

Texture header (section 4EDE3593)36 bytesSunset72% known

Little-endian. Layout from ALERT's Sunset Overdrive branch.

ProvenObservedSourcedInferredUnknownNot described

Offset	Size	Type	Field	Confidence	Notes
0x0	4	u32	SD length	Observed	SD pixel bytes; equals the wrapper's payload length
0x4	4	u32	HD length	Observed	HD stream bytes; 0 = no stream
0x8	4	u16[2]	HD width, height	Observed
0xC	4	u16[2]	SD width, height	Observed
0x10	2	u16	array size	Observed	1 (42,714), 4 (109), 2 (8), 8 (6), 16 (2), 32 (2)
0x12	1	u8	flags	Observed	0x40 = cube map; 0x80 = sRGB (inferred)
0x13	1	u8	planes	Unknown	4 (28,913), 0 (10,451), 1 (1,873), 18 (1,476), 2 (128)
0x14	2	u16	DXGI format	Observed
0x16	2	u16 = 0	zero	Observed
0x18	4	u32	unknown	Unknown	0 except 37 assets with float-like values, e.g. 0xBF000000 = −0.5f
0x1C	1	u8	SD mip count	Observed
0x1D	1	u8 = 0	zero	Observed
0x1E	4	u32	unknown	Unknown	0x01010001 (38,217), 0x03030001 (4,478), ...
0x22	1	u8	unknown	Unknown	1 (42,381), 3 (459), 2 (1)
0x23	1	u8	HD mip count	Observed	0 (33,058), 1 (2,643), 2 (7,140)

Pixel data

With bytes per 4 × 4 block (8 for BC1 and BC4, 16 for BC5, BC6H and BC7) or per pixel for the uncompressed formats, and each mip halving down to a minimum of one block, the size of the chain times the array size equals the SD length for 42,592 textures and six times it (cube maps) for the other 249; the HD chain times the array size equals the HD length for 9,783 of 9,783. Observed The HD mips sit above the SD ones: HD width = SD width << HD mips (7,140 textures are 4× with two HD mips, 2,643 are 2× with one). Observed The HD stream is one raw LZ4 block that decompresses to exactly the HD length (9,615 of 9,615) or, when its size equals the HD length, is stored (168 of 168). Observed

Flag 0x40 marks the cube maps exactly: it is set on the 249 textures whose SD length is six times the chain, and on no other (234 under textures/, 9 under atmospheres/). Observed

DXGI	Format	Textures (span 0)	Confidence
95	BC6H UF16	29,146 (28,911 are environment probes)	Observed
98	BC7 UNORM	11,238	Observed
83	BC5 UNORM	1,885	Observed
80	BC4 UNORM	467	Observed
28	R8G8B8A8 UNORM	92	Observed
71	BC1 UNORM	6	Observed
49	R8G8 UNORM	5	Observed
61	R8 UNORM	1	Observed
10	R16G16B16A16 float	1	Observed

No *_SRGB DXGI code appears. Observed The sRGB bit appears to be flag 0x80: it is set on 4,326 of 4,357 _c (colour) textures, 3 of 1,847 _n, and 0 of 1,601 _g. Inferred Path suffixes (_c colour BC7 with the sRGB bit, _n normal BC5, _g gloss or mask BC7 linear) come from counts of path suffixes only. Inferred The minimap ui/textures/hud/map/minimap.texture (id 0D9CD9DA) is BC7, 4688 × 3364, 1 mip, no HD stream; its SD length 15,770,432 is 1172 × 841 × 16. Observed

What is the slice order of array textures with mips, and the cube face order?

Array textures seen have one mip, which does not discriminate slice-major (DDS) from mip-major layout. The face order of the 249 cube maps is assumed to be the DDS order (+X −X +Y −Y +Z −Z) and was not checked.

What do the planes byte and the header fields at 24, 30 and 34 mean?

All are stored and counted; none has an established meaning.

Textures (.texture)

Header

Pixel data