[Interest] How to share QOpenGLContext between multiple QQuickRenderControl?

[黃柏鈞]

Hi,

I'm trying to use QQuickRenderControl to render QML offscreen and generate
texture. I started with the QQuickRenderControl example, everything works
fine until I try to add more QQuickRenderControl to render different QML.
The exception happened when I initialize the second QQuickRenderControl:


*ASSERT: "!context->property(QSG_RENDERCONTEXT_PROPERTY).isValid()" in file
scenegraph\qsgcontext.cpp, line 648*

After some search on web, I found the code in *qsgcontext.cpp*:




*if (m_attachToGLContext) {
Q_ASSERT(!context->property(QSG_RENDERCONTEXT_PROPERTY).isValid());
context->setProperty(QSG_RENDERCONTEXT_PROPERTY,
QVariant::fromValue(this)); }*
Is there a way to share QOpenGLContext between multiple
QQuickRenderControl? Although I could create a QOpenGLContext for each
QQuickRenderControl and it works, but creating that many contexts on same
thread doesn't make sense.

Regards,
Jarvis
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