Hi there, I'm still with my multithreading questions :-)
I'm testing two scenarios :
1) First case: (witness case)
- I create a thread 1, create a Producer::RenderSurface, but do NOT realize
it.
- In thread 1, I start an other Thread 2.
- In thread 2, I realize the previous RenderSurface, I call the init()
function of an associated osgUtil::SceneView (this point is optional, the
automatic call for init() works in this case), then I call cull() and draw()
in a loop.
==> With this scenario, everything works well.
2) Second case: (problem)
- I create a thread 1, create a producer::RenderSurface and DO realize it in
this thread, I also call the init() function of my associated SceneView()
[otherwise it would be called in the cull() function, and would crash in my
second thread...], then I start my Thread 2.
- In thread 2, I (try to...) call cull() and draw() in a loop...
==> I solved a first crash in cull() by calling SceneView::init() in the
first thread, but now, I have a crash in the draw() function: when first
applying a LightModel attribute to the state apparently in this function:
void LightModel::apply(State&) const
{
glLightModelfv(GL_LIGHT_MODEL_AMBIENT,_ambient.ptr());
//static bool s_separateSpecularSupported = strcmp((const char
*)glGetString(GL_VERSION),"1.2")>=0;
static bool s_separateSpecularSupported = (std::string((const
char*)glGetString(GL_VERSION)) == "
1.2");
if (s_separateSpecularSupported)
{
if (_colorControl==SEPARATE_SPECULAR_COLOR)
{
glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL,GL_SEPARATE_SPECULAR_COLOR);
}
else
{
glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL,GL_SINGLE_COLOR);
}
}
glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER,_localViewer);
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,_twoSided);
}
==> the function glGetString(GL_VERSION) returns NULL :'( !!!
... I guess it has something to do with OpenGL not being aware of its
initialization in the second thread... but I really have no clue how to
solve this (if it's even possible... !).
I think using the new osgViewer implementation might help, but I'm not ready
yet to take this change, any idea how to do this another way ?
regards,
Emmanuel.
PS: using OSG 1.2, WinXP, Nvidia Geforce 7900 GS.
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