CCPU_HPC Cannot process BC6H

[ProbablePrime]

In my test cases for Compressonator.NET, I try to use CMP_ProcessTexture from CMP_Framework to compute BC6H images.

When computing using CMP_ProcessTexture, CMP_Framework will automatically try to CMP_CreateComputeLibrary for you and defaults to HPC.

However due to Compressonator.NET not including plugins at the moment, CMP_ProcessTexture ends up using the Non-Plugin version of HPC.

When using Plugin_CCPU_HPC it utilizes a block of code labeled ENABLE_MAKE_COMPATIBLE_API. This converts, the incoming texture data into a compatible buffer for the Compression Option.

Particularly, BC6H needs the incoming buffers to be HALF(Float 16s).As CCPU_HPC does not do this, but passes the image data to the same compression code as Plugin_CCPU_HPC, we end up with access violations

To help with the confusion here I've created a diagram:

graph TD;
    CPT[CMP_ProcessTexture] -->CCL[CMP_CreateComputeLibrary];
    CCL --> PL;
    PL{Plugins Available?};
    PL -- Yes --> PHPC;
    PL -- No --> HPC
    HPC[HPC Compression via CCPU_HPC];
    PHPC[Plugin HPC Compression via Plugin_CCPU_HPC];

Loading

There are 2 other compression types but these are not used in the above diagram due to the path through CMP_ProcessTexture.

For added reference, here are some call stacks from the areas in question to show the differences in flow.

First, Compressonator CLI that does have plugins:

Secondly, here's the Callstack from CMP_ProcessTexture that does NOT have the plugins:

I think this can be fixed, by moving the ENABLE_MAKE_COMPATIBLE_API steps into CCPU_HPC from Plugin_CCPU_HPC. But this is too big of a change for our(Resonite's) current unit of work which is getting BC6H working via the flows Resonite uses.