Hi everybody,
If you see this question duplicated I'm sorry, it is because I have
written in the forum 4 days ago but my post is not approved yet, so I
will try here :P
I am developing an osg application in Windows that uses OpenCL
computation in some VBOs using the OpenGL/CL interop. For achieve
this, OpenCL has to be initialized with some info about OpenGL
contexts: the device context and the rendering context.
The first version of my application was implemented in OpenGL, so I
got the contexts using the functions wglGetCurrentDC() and
wglGetCurrentContext().
But now, I am passing it to OSG and I have errors in the OpenCL init.
I have been reading about this question and I discovered the getHDC()
and getWGLContext() of the GraphicsHandleWin32 class. But I think that
I am not doing a correct use of the class.
The way that I use this class is the next:
1- I declare a GraphicOperation derived class that will be executed in
the viewer->realize() method:
class WindowsContextInfo : public osg::GraphicsOperation
{
public:
WindowsContextInfo():
osg::GraphicsOperation("WindowsContextInfo", false) {}
virtual void operator() (osg::GraphicsContext* gc) {
osgViewer::GraphicsHandleWin32* windowsGraphicContext =
dynamic_cast<osgViewer::GraphicsHandleWin32*> (gc);
hdc = windowsGraphicContext->getHDC();
wglContext = windowsGraphicContext->getWGLContext();
}
HDC hdc;
HGLRC wglContext;
};
2- I attach an object of this class to the viewer and I call the
viewer->realize() method:
osg::ref_ptr<WindowsContextInfo> wci = new WindowsContextInfo;
viewer->setRealizeOperation(wci.get());
viewer->realize();
3- In the init properties of OpenCL I use the wci object for get the
HDC and the wlgContext:
cl_context_properties props[] = {
CL_CONTEXT_PLATFORM,
(cl_context_properties) platform, //This is not important
CL_GL_CONTEXT_KHR,
(cl_context_properties) wci->wglContext,
CL_WGL_HDC_KHR,
(cl_context_properties) wci->hdc,
0
};
This is all I have tried, but doesn't work. If someone knows what I
have done wrong I will pray for him to the Flying Spaghetti Monster.
Thanks!
--
--------------------------------------
Carlos Reig Matut
LSyM - Instituto IRTIC
Universidad de Valencia
Ph. +34 96 354 3639 -- ext. 43639
http://irtic.uv.es/lsym
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