Compression artifacts for BC7_UNORM when compressing on CPU (GPU is fine)

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
computer-graphics

Research direction

Start by reproducing the issue with the two texconv.exe commands in the report, comparing BC7_UNORM output with and without -nogpu. Trace the CPU BC7_UNORM compression path and compare its output with the GPU path. Done means the CPU-generated texture no longer shows the reported compression artifacts.

Written by the indexing model from the issue text.

Description

question

I was having issues with the library and thought it was because of my own code; but i noticed that the texconv tool shows the exact same problem.

texconv.exe -y BC7_UNORM texture.png

gives a different output than
texconv.exe -y BC7_UNORM -nogpu texture.png

Notice the artifacts in the CPU version:
image

This is with the GPU:
image

Dominant language
C++
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Merged PRs (30d)
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