QT QML with OpenGL

wonderman

Hi,

I want to know wether my code use OpenGl or not? I am using QT 4.8.1 on iMAX53 board. Freescale GPU driver is loaded on BSP. I have configured QT with opengl ES option. my code is below:
@
class CApplication : public QMainWindow
{
Q_OBJECT
public:
QmlApplicationViewer m_ViewObj; /** Holds View object */
}

CApplication : CApplication ()
{
// Create GLWidget
QGLFormat format = QGLFormat::defaultFormat();
format.setAlpha(true);
QGLWidget *glWidget = new QGLWidget(format);
glWidget->setAutoFillBackground(true);
m_ViewObj.setViewport(glWidget);

m_ViewObj.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
m_ViewObj.setSource(QUrl("qml/appmain.qml"));

show();

}
@

Now, my problem is when first time show function called in consturctor, QGLShader::link: "Link was successful" debug display on console and it will take around 2-3 seconds. which leads very bad performance on boot time. If i disable OpenGL in my program this debug is not displayed on console and show function execute within second.

I had done profiling with opengl and without opengl. there is no change on CPU usage without OpenGL. currently I am using only 2D view. So, i want to know, wheter my QML is used OpenGL for rendering or not? if not, then what will be change require to use opengl gpu for performance and how can I reduce boot time by bypassing shader linking.

Thanks in advance.
Manoj

Edit: please use @ tags around code sections; Andre

sierdzio

Can you wrap your code in '@' tags? It's hard to read at the moment.

wonderman

Code:

@
class CApplication : public QMainWindow
{
Q_OBJECT
public: QmlApplicationViewer m_ViewObj; /** Holds View object */
}

CApplication : CApplication ()
{
// Create GLWidget
QGLFormat format = QGLFormat::defaultFormat();
format.setAlpha(true);
QGLWidget *glWidget = new QGLWidget(format);
glWidget->setAutoFillBackground(true);
m_ViewObj.setViewport(glWidget);
m_ViewObj.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
m_ViewObj.setSource(QUrl(“qml/appmain.qml”));
show();
} @

Edit: no need for an @ before every line, just put one before your code block and one after...; Andre

wonderman

Is there any comments?

tzander

you wrote;
[quote]
I had done profiling with opengl and without opengl. there is no change on CPU usage without OpenGL.
[/quote]

This indicates that you are not using your GPU.
Check your drivers and try some test apps from your operating system that do GL (glgears is the simplest one).

Edit: code tags are not quote tags :-) ; Andre

wonderman

I find the solution of above problem. problem is related to continous intterupt received by CPU from SD card io driver which leads to poor perfromance of whole system.