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diff --git a/examples/quick/scenegraph/openglunderqml/doc/openglunderqml.rst b/examples/quick/scenegraph/openglunderqml/doc/openglunderqml.rst new file mode 100644 index 000000000..6a89a99d9 --- /dev/null +++ b/examples/quick/scenegraph/openglunderqml/doc/openglunderqml.rst @@ -0,0 +1,21 @@ +OpenGL under QML Squircle +========================= + +The OpenGL under QML example shows how an application can make use of the +QQuickWindow::beforeRendering() signal to draw custom OpenGL content under a Qt +Quick scene. This signal is emitted at the start of every frame, before the +scene graph starts its rendering, thus any OpenGL draw calls that are made as +a response to this signal, will stack under the Qt Quick items. + +As an alternative, applications that wish to render OpenGL content on top of +the Qt Quick scene, can do so by connecting to the +QQuickWindow::afterRendering() signal. + +In this example, we will also see how it is possible to have values that are +exposed to QML which affect the OpenGL rendering. We animate the threshold +value using a NumberAnimation in the QML file and this value is used by the +OpenGL shader program that draws the squircles. + +.. image:: squircle.png + :width: 400 + :alt: Squircle Screenshot |