SceneGraph always renders the whole scene
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Hello all!
I develop a medical application in embeded system (with eglfs, AM3517 processor based). I need to create a QML scene containing raw OpenGL Item (for displaying real-time graph).
I found this example in Qt documentation: http://qt-project.org/doc/qt-5.1/qtquick/scenegraph-textureinsgnode.html
, and modify it for my application (Change TextureNode class for render some VBO into FBO ).
I also have many other QML files that contain various elements of the interface.So.. then i run application with only openGL Item, i have 10% CPU usage:
main.qml
@
import QtQuick 2.0
import Graphics 1.0
Rectangle {
width: 800
height: 600
color: "Gray"
GraphItem{
x: 230; y: 180
width: 210
height: 160
}
}
@Then i run application with openGL Item and more other QML elements, do not overlap OpenGL item, i have 50% CPU usage!!:
main.qml
@
import QtQuick 2.0
import Graphics 1.0
Rectangle {
width: 800
height: 600
color: "Gray"
GraphItem{
x: 230; y: 180
width: 210
height: 160
}
MyOtherItems{
// this contains many rectangles, texts and other
}
}
@
I conclude that SceneGraph Renderer render All items all time.My question: What i deal whrong? How render every time ONLY OpenGL SGNode? How i may watch scenegraph for debuging render process?