secondlife / secondlife/viewer

[ExtraFPS] OpenJPEG 2.5.2 makes textures taste the rainbow

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Dominant language
C++
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Merged PRs (30d)
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Description

Previously without Kakadu JPEG2000 and only OpenJPEG (2.5.0), some textures at lower level of detail would simply turn grey until DeltaFPS appeared to (mostly) resolve the issue. Now building a viewer with OpenJPEG 2.5.2 appears to cause various textures at lower level of detail to take on varying spotted rainbow patterns.

https://secondlife.canny.io/admin/board/bug-reports/p/extrafps-openjpeg-252-makes-textures-taste-the-rainbow

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the texture rendering problem in a viewer built with OpenJPEG 2.5.2, then compare the same lower-level-of-detail textures with OpenJPEG 2.5.0 and without Kakadu JPEG2000. Done means the affected textures no longer display spotted rainbow patterns.

Written by the indexing model from the issue text.

Assessment

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

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