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  1. Qt
  2. QTBUG-96789

Shader cache not able to write out compiled shaders

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Done
    • Affects Version/s: 5.12.9
    • Fix Version/s: 6.2.1, 6.3.0 Alpha
    • Component/s: GUI: OpenGL
    • Labels:
      None
    • Environment:
      Ubuntu Touch on arm64 and armhf devices
    • Platform/s:
      Linux/Other display system
    • Commits:
      46e6a9a759ae89f905107ccad191ca5ddf442e53 (qt/qtbase/dev) 2fc4a1b53042b69bdb745e2e69c861eecf945b3c (qt/qtbase/6.1) 9a156b4e84867f89f2e9082a883276a1a165e063 (qt/qtbase/6.2)

      Description

      Currently the Ubuntu Touch OS is very restrictive about what paths can be accesed by each application.

      src/gui/opengl/qopenglprogrambinarycache.cpp tries to write to the general cache folder on the users home dir level, but that is blocked: https://github.com/qt/qtbase/blob/823ed71e220ebde07970dd61c04bb47b01dd06c4/src/gui/opengl/qopenglprogrambinarycache.cpp#L416-L423 fails. QStandardPaths::GenericCacheLocation is write-protected unless an exemption is made for an app or for all apps.
      We are instead offering the applications to write to QStandardPaths::CacheLocation but this is not used by the shader cache code. And we believe this is a bug actually.

       

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            Assignee:
            lagocs Laszlo Agocs
            Reporter:
            flohack Florian Leeber
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              Dates

              Created:
              Updated:
              Resolved:

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