ASTC formats are described in the “ASTC Compressed Texture Image Formats” chapter of the Khronos Data Format Specification.
Table B.3. Mapping of Vulkan ASTC formats to descriptions
VkFormat | Compressed texel block dimensions | sRGB-encoded |
---|---|---|
| $4\times 4$ | No |
| $4\times 4$ | Yes |
| $5\times 4$ | No |
| $5\times 4$ | Yes |
| $5\times 5$ | No |
| $5\times 5$ | Yes |
| $6\times 5$ | No |
| $6\times 5$ | Yes |
| $6\times 6$ | No |
| $6\times 6$ | Yes |
| $8\times 5$ | No |
| $8\times 5$ | Yes |
| $8\times 6$ | No |
| $8\times 6$ | Yes |
| $8\times 8$ | No |
| $8\times 8$ | Yes |
| $10\times 5$ | No |
| $10\times 5$ | Yes |
| $10\times 6$ | No |
| $10\times 6$ | Yes |
| $10\times 8$ | No |
| $10\times 8$ | Yes |
| $10\times 10$ | No |
| $10\times 10$ | Yes |
| $12\times 10$ | No |
| $12\times 10$ | Yes |
| $12\times 12$ | No |
| $12\times 12$ | Yes |