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+---
+title: VTF v7.6 Format
+---
+
+# VTF Version 7.6
+
+VTF v7.6 is Strata Source's modified VTF format that adds a few new image formats, as well as optional CPU compression.
+This document goes over all additions to the format.
+
+No changes have been made to the header's fields. The header is identical to VTF v7.5.
+
+## New Texture Formats
+
+A few new texture formats are present in Strata Source. These will technically work in any VTF version loaded by a Strata Source
+game, but it is recommended to only use them in v7.6 VTFs so there isn't any confusion about why the textures will not work in
+older Source engine games.
+
+| Name   | Value | Description                                                                                                                                                              |
+| ------ | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
+| `R8`   | `69`  | Identical to `I8`, except where `I8` is treated as greyscale `R8` is purely a red channel. No practical benefit to using this format outside internal engine operations. |
+| `BC7`  | `70`  | This format is recommended as a replacement for `DXT5`. The alpha channel is optional.                                                                                   |
+| `BC6H` | `71`  | Used to store cubemaps, and recommended for HDR textures. This is the signed half-float variant.                                                                         |
+
+## New Resources
+
+There is one new resource in VTF v7.6. The "Auxiliary Compression Info" resource (`AXC` identifier) controls CPU compression
+of texture data. The first version of this resource is supported by all Strata Source games, and has the following structure,
+excluding the length integer present in every non-legacy resource:
+
+```cpp
+struct AXC_v1 {
+    uint32_t compression_strength;
+    uint32_t compressed_sizes[mip_count * frame_count * face_count];
+};
+```
+
+The only supported compression method for this version is [Deflate](https://en.wikipedia.org/wiki/Deflate). The compression
+strength can be `-1` (default compression strength), `0` (no compression was applied), or `1-9` (specific compression strength).
+If the compression strength is `0` the VTF is assumed to be uncompressed and the resource is ignored.
+
+The compressed sizes array is structured similarly to how VTF texture data is structured. In pseudocode:
+
+```
+for each mip level:
+    for each frame:
+        for each face:
+            uint32_t compressed_size
+```
+
+The array stores the compressed size of each piece of texture data. They are compressed separately to avoid having to decompress
+the entire VTF every time a different part of it is accessed. 3D textures (textures with more than one slice) are compressed as one
+unit rather than compressing each individual slice. The uncompressed size can be calculated from the texture dimensions and format.
+To calculate the offset of a texture into the image resource at a given mip, frame, and face, the size of every compressed texture
+before it must be added together.
+
+The second and most recent version of the `AXC` resource introduces a field to control the compression method, and adds support for
+[Zstandard](https://facebook.github.io/zstd/) compression. The structure of the resource is now:
+
+```cpp
+// These values match minizip defines, but keep in
+// mind they are the only ones supported right now
+uint16_t METHOD_DEFLATE = 8;
+uint16_t METHOD_ZSTD = 93;
+
+struct AXC_v2 {
+    uint16_t compression_strength;
+    uint16_t compression_method;
+    uint32_t compressed_sizes[mip_count * frame_count * face_count];
+};
+```
+
+The version of the `AXC` resource can be determined using the compression method field. If the field is less than or equal to `0`,
+the resource is the original, and the compression method is known to be Deflate. If the field is either `8` or `93` (the only supported
+values currently) then the resource is the second iteration, and the value can be relied on to determine the compression method.
+If the compression method lies outside this domain the VTF is malformed.
+
+> [!REVOLUTION]
+> The second version of this resource is unsupported in Portal: Revolution when compressing with Zstandard. Portal: Revolution is expecting
+> the original version of the resource, and cannot decode Zstandard compression. Due to the resource's forwards and backwards compatibility
+> however, as long as Deflate compression is specified when creating a compressed VTF Portal: Revolution will support that VTF, even though
+> it may be using the updated resource definition.