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Webgl context lost, how to restore lost context

Discussion in 'WebGL' started by Grzegorz_Chomik, Jun 28, 2017.

  1. Grzegorz_Chomik

    Grzegorz_Chomik

    Joined:
    Jun 28, 2017
    Posts:
    1
    I'm working on an application that has to work all the time in my browser. Unfortunately after some time the application lost contex. How to restore a lost context ???
    I ask you for help.
     
    Grzegorz_Chomik, Jun 28, 2017
    #1

  2. splashdesign

    splashdesign

    Joined:
    Jul 14, 2017
    Posts:
    5
    Please help me,
    How can I restore a lost context????
     
    splashdesign, Aug 2, 2017
    #2

  3. Marco-Trivellato

    Marco-Trivellato

    Unity Technologies

    Joined:
    Jul 9, 2013
    Posts:
    1,654
    What do you mean by "lost context"?
     
    Marco-Trivellato, Aug 4, 2017
    #3

  4. kognito1

    kognito1

    Joined:
    Apr 7, 2015
    Posts:
    331
    I suspect he means his gpu (driver) went idle and lost the direct3d/opengl context. We have same error occur once in a blue moon when Windows Update just happens to update a gpu driver while we're in the middle of running some WebGL content. It's not specific to WebGL obviously, any 3D application is susceptible.

    In general (hand waving), once a context is lost it's extremely difficult to restore (essentially in practice it's impossible).
     
    kognito1, Aug 4, 2017
    #4

  5. Marco-Trivellato

    Marco-Trivellato

    Unity Technologies

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    Jul 9, 2013
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    yes, if it's the direct3d/opengl context we are talking about, I don't think there is much Unity can do about it.
     
    Marco-Trivellato, Aug 7, 2017
    #5

  6. Marco-Trivellato

    Marco-Trivellato

    Unity Technologies

    Joined:
    Jul 9, 2013
    Posts:
    1,654
    I see there is a webgl extension to simulate context lost. I'll look into it...
     
    Marco-Trivellato, Aug 7, 2017
    #6

  7. Baraphor

    Baraphor

    Joined:
    Nov 16, 2016
    Posts:
    32
    Any Update to this issue?
     
    Baraphor, Feb 5, 2018
    #7

  8. astyles_imb

    astyles_imb

    Joined:
    Nov 12, 2019
    Posts:
    5
    Any update on this?
     
    astyles_imb, Dec 19, 2019
    #8

  9. SupremacyLasse

    SupremacyLasse

    Joined:
    Sep 3, 2020
    Posts:
    3
    Any update on this? I'm getting context lost in mid-game with 2021.3
     
    SupremacyLasse, Dec 5, 2022
    #9

  10. EnigmaFactory

    EnigmaFactory

    Joined:
    Dec 10, 2011
    Posts:
    97
    Bumped. 2021.3 WebGL. Works on most PCs and most browsers excerpt some specific Windows 10 / 11 boxes with certain version of Chrome getting context lost. http://enigmafactorgames.com/parc
     
    EnigmaFactory, Aug 24, 2023
    #10

  11. unityruba

    unityruba

    Unity Technologies

    Joined:
    Nov 6, 2020
    Posts:
    233
    Hi folks. Would anyone here be willing to open a bug report for us to look into this "WebGL context lost" issue? We aren't aware of it outside of this thread and it hasn't shown up in our tests / other bug reports.

    Unfortunately there is no way to "restore" a lost WebGL context (see: https://www.khronos.org/webgl/wiki/HandlingContextLost)
    it can be re-created, but all the GPU data held by the previous context is gone.
     
    Last edited: Aug 24, 2023
    unityruba, Aug 24, 2023
    #11