Details
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Bug
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Resolution: Unresolved
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P1: Critical
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None
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6.2.12, 6.5.5-1, 6.7.0
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Windows 10 22H2, Intel HD Graphics 630, MSVC 2019 x64
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Windows
Description
According to https://github.com/qt/qtwebengine/commit/c7d46325e635d1fb4482b53dce866e2c55026a7e --enable-webgl-software-rendering can be used to enable WebGL when using opengl32sw.dll. And according to the comments in QTBUG-69236 it used to work in Qt 5.12.2.
However, bad things happen most of the time when attempting this on currently-supported versions.
Steps to reproduce
1. Load the WebEngine Widgets Simple Browser Example (https://doc.qt.io/qt-6/qtwebengine-webenginewidgets-simplebrowser-example.html )
2. Build and run the example using the environment variables QT_OPENGL=software and QTWEBENGINE_CHROMIUM_FLAGS=--enable-webgl-software-rendering
3. (If the app is responsive) Navigate to https://webglreport.com
4. (For Qt >=6.5 where Qt WebEngine uses the D3D11 RHI backend by deault) Repeat the test after adding a 3rd environment variable, QSG_RHI_BACKEND=opengl
Outcomes
| Qt version | QSG_RHI_BACKEND not set | QSG_RHI_BACKEND=opengl |
|---|---|---|
| 6.7.0 | App runs (WebGL enabled) | App crashes before the window opens |
| 6.5.5 | App freezes after the window opens | App runs (WebGL disabled) |
| 6.2.12 | App sometimes runs (WebGL disabled), sometimes crashes before the window opens ("Failed to initialize graphics backend for OpenGL.") | N/A |
| 5.15.16 | App is partially responsive (QWidgets work normally) but QWebEngineView displays a blank white page | N/A |
Note: For Qt 6.2.12, I can get different outcomes by closing and re-opening the app (without rebuilding)
Attachments
Issue Links
- replaces
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- Closed
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