Hi Forum,
It has been a while and i did not get any feed-back over my last post. I
realized that i was not clear enough in my explanation. Let me try again.
I store the current graphics context and part of the code snippet shows that
the current context is stored:
Code:
void Context::operator() (osg::GraphicsContext *gc)
{
if(gc->getState() == NULL)
{
osg::notify(osg::FATAL) << __FUNCTION__ << ": "
<< "osg::GraphicsContext must have a valid
state. "
<< std::endl;
exit(EXIT_FAILURE);
}
//make this context current if not the current context
if(!gc->isCurrent())
gc->makeCurrent();
.................................
..................................
// Bind context to osgCompute::GLMemory
if( osgCompute::GLMemory::getContext() == NULL )
osgCompute::GLMemory::bindToContext( *gc );
.................................
.................................
}
As you can see that inside the realize operation i store the current context
for later reference.
Now i use this context reference id to create the buffer object as follows:
Code:
......................
......................
//get or create a vertex buffer object from the geometry
osg::VertexBufferObject *vbo =
_m_clGeomRef->getOrCreateVertexBufferObject();
//make sure that we have the vertex buffer object
//AND i checked the vbo creation is successful
if(!vbo)
return NULL;
......................................
......................................
//get the buffer object
// I HAVE THE PROBLEM WITH THE FOLLOWING STATEMENT.
// event though i get a valid pointer to glBO, i checked though the
debugger that
//glGenBuffers is generating a buffer id with 0 value
osg::GLBufferObject *glBO =
vbo->getOrCreateGLBufferObject(osgCompute::GLMemory::getContext()->getState()->getContextID());
//make sure that we have the buffer object
if(!glBO)
return NULL;
I have no idea why am i getting 0 value for the buffer id with glGenBuffers(..)
call inside the constructor of GLBufferObject() - the class that came along
with the repository.
I am using the context id that i have stored inside the realize operation.
Any hint on what might have went wrong ? Where should i look into ?
I shall be eagerly looking forward to your hint over this issue.
Thanks,
Sajjadul
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=56839#56839
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