How to enable WebGL in QWebEngineView?

8Observer8

PyQt Version: 6.6.1
PySide Version: 6.6.1

Hi,

I try to enable WebGL in QWebEngineView:

view.settings().setAttribute(QWebEngineSettings.WebAttribute.WebGLEnabled, True)
view.setUrl(QUrl("https://get.webgl.org/"))

but it doesn't work:

main.py

import sys

from PySide6.QtCore import QUrl
from PySide6.QtWebEngineCore import QWebEngineSettings
from PySide6.QtWebEngineWidgets import QWebEngineView
from PySide6.QtWidgets import QApplication, QVBoxLayout, QWidget


class Widget(QWidget):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("QWebEngineView, PySide6, Python")
        self.resize(650, 400)

        layout = QVBoxLayout()
        view = QWebEngineView()
        layout.addWidget(view)
        self.setLayout(layout)

        # view.load(QUrl("file:///web-project/index.html"))
        view.settings().setAttribute(QWebEngineSettings.WebAttribute.WebGLEnabled, True)
        print("----------------------")
        print(view.settings().testAttribute(QWebEngineSettings.WebAttribute.WebGLEnabled))
        view.setUrl(QUrl("https://get.webgl.org/"))

if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec())

Console output:

D3D11 smoke test failed (failed to create vertex shader)
----------------------
True
doh set to ""  --  SystemOnly
D3D11 smoke test failed (failed to create vertex shader)
js: Unrecognized Content-Security-Policy directive 'image-src'.

8Observer8

PyQt 6.6.1 behaves exactly the same way:

Console output:

D3D11 smoke test failed (failed to create vertex shader)
----------------------
True
doh set to ""  --  SystemOnly
D3D11 smoke test failed (failed to create vertex shader)
js: Unrecognized Content-Security-Policy directive 'image-src'.

main.py

import sys

from PyQt6.QtCore import QUrl
from PyQt6.QtWebEngineCore import QWebEngineSettings
from PyQt6.QtWebEngineWidgets import QWebEngineView
from PyQt6.QtWidgets import QApplication, QVBoxLayout, QWidget


class Widget(QWidget):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("QWebEngineView, PyQt6, Python")
        self.resize(650, 400)

        layout = QVBoxLayout()
        view = QWebEngineView()
        layout.addWidget(view)
        self.setLayout(layout)

        # view.load(QUrl("file:///web-project/index.html"))
        view.settings().setAttribute(QWebEngineSettings.WebAttribute.WebGLEnabled, True)
        print("----------------------")
        print(view.settings().testAttribute(QWebEngineSettings.WebAttribute.WebGLEnabled))
        view.setUrl(QUrl("https://get.webgl.org/"))

if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec())

PySide 6.1.1 includes WebEngine. For PyQt 6.1.1 the WebEngine must be installed using this command: pip install PyQt6-WebEngine

8Observer8

I created a question on StackOverflow and added there some additional information: https://stackoverflow.com/questions/77690410/how-to-enable-webgl-in-qwebengineview

8Observer8

This is an answer of @ekhumoro from StackOverflow:

QTBUG-42182 is quite old, but the last comment there states: "The current status in Qt 5.5 is this: WebGL and accelerated Canvas work with OpenGL and are blacklisted unfortunately for ANGLE and software renderers due to thread synchronization issues with the former and performance issues with the latter.". This would seem to match your setup, but it's unclear whether it affects Qt6 or only applies to Qt5. Another issue is that none of the WebGL tests you did seems able to identify your GPU at all, which doesn't look promising...