{ "version": "https://jsonfeed.org/version/1", "title": "LiteHell's blog", "home_page_url": "https://blog-en.litehell.info", "feed_url": "https://blog-en.litehell.info/feed/json", "description": "LiteHell's personal blog with articles related to my life, software engineers, and computers", "icon": "https://gravatar.com/avatar/837266b567b50fd59e72428220bf69b1", "author": { "name": "Yeonjin Shin", "url": "https://litehell.info" }, "items": [ { "id": "how_to_fix_libgl_error_on_64bit_fedora", "content_html": "

Problem

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You may encounter this error when you try to run Windows game with umu-launcher or wine, on 64bit Fedora.

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libGL error: MESA-LOADER: failed to open iris: /usr/lib/pressure-vessel/overrides/lib/x86_64-linux-gnu/dri/iris_dri.so: wrong ELF class: ELFCLASS64 (search paths /usr/lib/pressure-vessel/overrides/lib/x86_64-linux-gnu/dri)\nlibGL error: failed to load driver: iris\nlibGL error: MESA-LOADER: failed to open swrast: /usr/lib/pressure-vessel/overrides/lib/x86_64-linux-gnu/dri/swrast_dri.so: wrong ELF class: ELFCLASS64 (search paths /usr/lib/pressure-vessel/overrides/lib/x86_64-linux-gnu/dri)\nlibGL error: failed to load driver: swrast\nX Error of failed request:  GLXBadContext\n  Major opcode of failed request:  150 (GLX)\n  Minor opcode of failed request:  6 (X_GLXIsDirect)\n  Serial number of failed request:  537\n  Current serial number in output stream:  536\n\n
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Solution

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Solution is very simple. Just install 32bit library.

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sudo dnf install mesa-libGL.i686\n
", "url": "https://blog-en.litehell.info/post/how_to_fix_libgl_error_on_64bit_fedora", "title": "How to fix libGL (MESA-LOADER) error on 64-bit Fedora", "summary": "Error due to missing 32bit library", "image": "https://gravatar.com/avatar/837266b567b50fd59e72428220bf69b1", "date_modified": "2025-11-25T13:11:43.828Z" }, { "id": "wivrn_for_non_steam_windows_games", "content_html": "

Introduction

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I use Linux for laptop. I installed WiVRn and OpenComposite1 for VR gaming on Linux, as recommended by perillamint.

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It works well for Linux native VR programs (e.g. xrgears) and Steam games.

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However, it had a problem that non-Steam Windows games don't work.

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First try

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Steam games works well for VR. Steam uses Proton. Then, How about using Proton for non-Steam games?

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umu-launcher

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I tried umu-launcher, a program to run Proton for games not in Steam. (Actually, It uses Proton GE, not Proton by Valve. But, it doesn't matter in this post.)

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Proton includes OpenXR/VR support. So I expected that it will work well if I set environment variables following SteamVR documentation of WinVR. But it didn't work.

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PRESSURE_VESSEL_FILESYSTEMS_RW=/run/user/1000/wivrn/comp_ipc\nXR_RUNTIME_JSON=/run/host/usr/share/openxr/1/openxr_wivrn.json\n
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Why?

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Reason

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After some googling, I found that It needs Steam to be launched to use OpenVR/XR on Proton, and umu launcher doesn't launch Steam by default.

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How can I resolve it with minimum efforts?

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Solution: Then run Steam :D

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Simple. Just run Steam.

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Firstly, Let's check where the Proton is. Check debug log by running this command (Type /tmp/2q3ef32t part randomly. It doesn't matter)

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UMU_LOG=debug umu-run /tmp/2q3ef32t\n
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Then, you can see the location of proton from the console log. (e.g. /home/foo/.local/share/Steam/compatibilitytools.d/UMU-Proton-9.0-4e/proton) The below is example part of console log.

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[umu.umu_run:887] DEBUG: (PosixPath('/home/foo/.local/share/umu/steamrt3/umu'), '--verb', 'waitforexitandrun', '--', PosixPath('/home/foo/.local/share/umu/steamrt3/umu-shim'), PosixPath('/home/foo/.local/share/Steam/compatibilitytools.d/UMU-Proton-9.0-4e/proton'), 'waitforexitandrun', './asdf')\n
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Find this code from the proton file with editor

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        # CoD: Black Ops 3 workaround\n        if os.environ.get(\"SteamGameId\", 0) in [\n                    \"311210\",   # CoD: Black Ops 3\n                    \"1549250\",  # Undecember\n                ]:\n            argv = [g_proton.wine_bin, \"c:\\\\Program Files (x86)\\\\Steam\\\\steam.exe\"]\n
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Replace above code to below.

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        if os.environ.get(\"UMU_RUN_STEAM\", 0) == \"1\":\n            argv = [g_proton.wine64_bin, \"c:\\\\windows\\\\system32\\\\steam.exe\"]\n        # CoD: Black Ops 3 workaround\n        elif os.environ.get(\"SteamGameId\", 0) in [\n                    \"311210\",   # CoD: Black Ops 3\n                    \"1549250\",  # Undecember\n                ]:\n            argv = [g_proton.wine_bin, \"c:\\\\Program Files (x86)\\\\Steam\\\\steam.exe\"]\n
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Finally, Run game UMU_RUN_STEAM environment variable and WiVRn-related environment variables. Check this script for details.

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#!/bin/sh\nexport UMU_RUN_STEAM=1 \nexport PRESSURE_VESSEL_FILESYSTEMS_RW=/run/user/1000/wivrn/comp_ipc\nexport XR_RUNTIME_JSON=/run/host/usr/share/openxr/1/openxr_wivrn.json\nexport PRESSURE_VESSEL_IMPORT_OPENXR_1_RUNTIMES=1\numu-run ./Game.exe\n
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Then It works.

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Final words

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It's not fundamental solution but simple solution. I wish it could help...

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Footnotes

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    \n
  1. \n

    The program that makes games using OpenVR be able to run with OpenXR API. ↩

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    2. \n
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", "url": "https://blog-en.litehell.info/post/wivrn_for_non_steam_windows_games", "title": "How to run non-Steam Windows game on Linux with WiVRn", "summary": "Troubleshooting with umu-launcher", "image": "https://gravatar.com/avatar/837266b567b50fd59e72428220bf69b1", "date_modified": "2025-10-19T17:28:23.271Z" }, { "id": "how_to_run_rpg_maker_mv_on_linux", "content_html": "

Introduction

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I tried to run games made with RPG Maker MV, but it stucks at loading.

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Solution

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I thought installing Windows on VM, but I found nwjs.dll file. The structure of package.json in the www directory of the game is also similar with the one of nwjs applications.

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What if I just use nwjs binary for Linux? I tried it, and it actually worked.

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  1. Download Linux binaries from nwjs homepage (No need to use SDK versions)
    2. \n
  2. Find a directory having package.json (Usually www directory)
    3. \n
  3. Run the nwjs binary, downloading in the Step 1, with the directory found in the Step 2 as parameter. (e.g. ~/nwjs-binary/nwjs ~/game/www)
    4. \n
  4. If it didn't work, the package.json file might have empty name. Update the name property of package.json file to arbitary random value.
    5. \n
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If you follow this guide, it should work. It might not work for some games, but... it works for me.

", "url": "https://blog-en.litehell.info/post/how_to_run_rpg_maker_mv_on_linux", "title": "How to run RPG Maker MV games on Linux", "summary": "when it does not work well with wine", "image": "https://gravatar.com/avatar/837266b567b50fd59e72428220bf69b1", "date_modified": "2025-10-19T16:52:05.437Z" } ] }