Ed,
We have since done some digging on our side, I’ll put a few more details here if you don’t mind.
There are two main issues:
- The cooker is indeed ignoring HDR textures, and thus not doing any compression. Perhaps because typically ETC2 and PVRTC are unable to compress HDR textures so somehow this was forgotten.
- A “exr_to_htga.exe” is missing from the folder where astcenc.exe is located. Even if the first issue was resolved, the current astcenc.exe would not be able to compress HDR data as the above mention executable is needed by astcenc.exe process.
Here is a link explaining this specific issue and how to fix it, in short: OpenEXR lib is needed to compile the exr_to_htga.exe.
https://community.arm.com/graphics/f/discussions/4619/mali-texture-compression-exr_to_tga-command?pi72=1&pi69=64