Hello,
I would like to ask for some clarification about the management of
shaders in a multiple window environment.
In my application, I have the following setup, and I'm unsure if this is
the right way to do it. Additionally, I'm facing problems...
I have multiple windows which renders OpenSG scenes (handled by scene
managers one for each scene). In each scene manager, I have created a
ShaderProgramChunk for my silhouettes rendering task, which is shared by
all concerned materials in the scene. Additionally, some windows can
also render the same scene with the same ShaderProgramChunk.
Is this a valid setup? I.e. is it allowed to share ShaderProgramChunks
between multiple materials and to share one scene graph containing such
materials between different windows (i.e. OpenGL contexts)?
Now to my problems.
Imagine that I have a dialog with an embedded OpenGL window, which
renders a mini scene with some silhouettes. The dialog allows me to turn
shilhouette rendering ON and OFF globally, i.e for all windows. If I
switch the silhouette rendering OFF, the respective silhouette branch of
my scene is not rendered anymore (by means of a MultiSwitch core). The
important detail here is that the silhouette tree is still part of the
scene but not rendered by design.
On application start the following happens
1. window and opengl context creation.
2. SceneManager + silhouette ShaderProgramChunk creation
3. No geometry, therefore no shader usage
Now I open my dialog and turn silhouette rendering OFF (default is ON).
The following happens:
1. window and opengl context creation.
2. SceneManager + silhouette ShaderProgramChunk creation
3. geometry creation in the new SceneManager with sihlouette shader
material
4. Silhouettes are shown (initial state was ON)
5. Switch them Off => Silhouettes not shown
6. Close dialog
7. window get destroyed, SceneManager get deleted, geometry get deleted
and ShaderProgramChunk is released
In my main application window, I then create a geometry with silhouette
shader material silenced by the MultiSwitch. This one is shown
correctly. Then I reopen my dialog and turn silhouettes on. Until now
all is rendered correctly. But now I create an additional geometry in my
main window scene. It has the silhouette ShaderProgramChunk handled by
SceneManager from the main window. But the geometry is not rendered
anymore correctly. It should have rendered silhouettes and gourand
shaded faces but I only see a white imprint of the geometry on my
colored background.
I have then tested the following. Just before redraw I added the
following to my code:
ShaderProgramChunk* shl =
view->getSceneManager()->getSilhouetteShaderChunk();
ShaderProgram* vertShader = shl->getVertexShader(0);
ShaderProgram* geomShader = shl->getGeometryShader(0);
ShaderProgram* fragShader = shl->getFragmentShader(0);
if (_win->getGLObjectId(vertShader->getGLId()) == 0)
int test = 2354;
if (_win->getGLObjectId(geomShader->getGLId()) == 0)
int test = 2354;
if (_win->getGLObjectId(fragShader->getGLId()) == 0)
int test = 2354;
If I have silhouette rendering turned ON, I do not run into the
if-branches and the geometry with silhouettes get rendered correctly.
That is fine and expected.
If I turn silhouette rendering OFF (without the dialog), the correct
geometry is rendered without silhouettes. I do run into the if-branches.
Correct and also expected.
If, however, I turn them OFF and then ON with the dialog, like I
described above, I have no rendered silhouettes, and I run into the
if-branches. That is not expected! What could be happening here?
After that, I have added a validateAllGLObjects() call. But that leads
to a program crash with the call stack shown below
Thread::getCurrentChangeList()->fillStatistic(_action->getStatCollector(
));
Thread::getCurrentChangeList()->commitChanges();
_win->validateAllGLObjects();
_win->render(_action);
> OSGSystemD.dll!OSG::ShaderExecutableChunkBase::getGLId() Line
182 + 0x11 bytes C++
OSGSystemD.dll!OSG::ShaderExecutableChunk::handleGL(OSG::DrawEnv
* pEnv=0x0000000014365920, unsigned int id=413,
OSG::Window::GLObjectStatusE mode=needrefresh, unsigned int uiOptions=0)
Line 212 + 0xd bytes C++
OSGSystemD.dll!boost::_mfi::mf4<unsigned
int,OSG::ShaderExecutableChunk,OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned
int>::call<OSG::MTRefCountPtr<OSG::ShaderExecutableChunk,OSG::NoRefCount
Policy>,OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned
int>(OSG::MTRefCountPtr<OSG::ShaderExecutableChunk,OSG::NoRefCountPolicy
> & u={...}, const void * __formal=0x0000000000000000, OSG::DrawEnv * &
b1=0x0000000014365920, unsigned int & b2=413,
OSG::Window::GLObjectStatusE & b3=needrefresh, unsigned int & b4=0)
Line 498 C++
OSGSystemD.dll!boost::_mfi::mf4<unsigned
int,OSG::ShaderExecutableChunk,OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned
int>::operator()<OSG::MTRefCountPtr<OSG::ShaderExecutableChunk,OSG::NoRe
fCountPolicy>
>(OSG::MTRefCountPtr<OSG::ShaderExecutableChunk,OSG::NoRefCountPolicy> &
u={...}, OSG::DrawEnv * a1=0x0000000014365920, unsigned int a2=413,
OSG::Window::GLObjectStatusE a3=needrefresh, unsigned int a4=0) Line
513 C++
OSGSystemD.dll!boost::_bi::list5<boost::_bi::value<OSG::MTRefCountPtr<OS
G::ShaderExecutableChunk,OSG::NoRefCountPolicy>
>,boost::arg<1>,boost::arg<2>,boost::arg<3>,boost::arg<4>
>::operator()<unsigned int,boost::_mfi::mf4<unsigned
int,OSG::ShaderExecutableChunk,OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned
int>,boost::_bi::list4<OSG::DrawEnv * __ptr64 & __ptr64,unsigned int &
__ptr64,enum OSG::Window::GLObjectStatusE & __ptr64,unsigned int &
__ptr64> >(boost::_bi::type<unsigned int> __formal={...},
boost::_mfi::mf4<unsigned int,OSG::ShaderExecutableChunk,OSG::DrawEnv
*,unsigned int,enum OSG::Window::GLObjectStatusE,unsigned int> &
f={...}, boost::_bi::list4<OSG::DrawEnv * &,unsigned int &,enum
OSG::Window::GLObjectStatusE &,unsigned int &> & a={...},
boost::_bi::type<unsigned int> __formal={...}) Line 516 C++
OSGSystemD.dll!boost::_bi::bind_t<unsigned
int,boost::_mfi::mf4<unsigned
int,OSG::ShaderExecutableChunk,OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned
int>,boost::_bi::list5<boost::_bi::value<OSG::MTRefCountPtr<OSG::ShaderE
xecutableChunk,OSG::NoRefCountPolicy>
>,boost::arg<1>,boost::arg<2>,boost::arg<3>,boost::arg<4> >
>::operator()<OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned int>(OSG::DrawEnv * &
a1=0x0000000014365920, unsigned int & a2=413,
OSG::Window::GLObjectStatusE & a3=needrefresh, unsigned int & a4=0)
Line 146 C++
OSGSystemD.dll!boost::detail::function::function_obj_invoker4<boost::_bi
::bind_t<unsigned int,boost::_mfi::mf4<unsigned
int,OSG::ShaderExecutableChunk,OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned
int>,boost::_bi::list5<boost::_bi::value<OSG::MTRefCountPtr<OSG::ShaderE
xecutableChunk,OSG::NoRefCountPolicy>
>,boost::arg<1>,boost::arg<2>,boost::arg<3>,boost::arg<4> > >,unsigned
int,OSG::DrawEnv * __ptr64,unsigned int,enum
OSG::Window::GLObjectStatusE,unsigned
int>::invoke(boost::detail::function::function_buffer &
function_obj_ptr={...}, OSG::DrawEnv * a0=0x0000000014365920, unsigned
int a1=413, OSG::Window::GLObjectStatusE a2=needrefresh, unsigned int
a3=0) Line 133 C++
OSGSystemD.dll!boost::function4<unsigned int,OSG::DrawEnv *
__ptr64,unsigned int,enum OSG::Window::GLObjectStatusE,unsigned
int>::operator()(OSG::DrawEnv * a0=0x0000000014365920, unsigned int
a1=413, OSG::Window::GLObjectStatusE a2=needrefresh, unsigned int a3=0)
Line 761 C++
OSGSystemD.dll!OSG::Window::validateGLObject(unsigned int
osgId=413, OSG::DrawEnv * pEnv=0x0000000014365920, unsigned int
uiOptions=0) Line 700 + 0x33 bytes C++
OSGSystemD.dll!OSG::Window::validateAllGLObjects() Line 724
C++
RenderEngineD.dll!RenderEngine::graphic::CompositeViewer::redraw() Line
405 C++
- this 0x0000004000081ae2 {_mfVertexShader={...}
_mfGeometryShader={...} _mfFragmentShader={...} ...} const
OSG::ShaderExecutableChunkBase * const
+ OSG::StateChunk {...} OSG::StateChunk
+ _type {_baseType=IsAttachment
_pPrototype=0x0000000009ab9f60 _fPrototypeCreate=0x000007fee4c134b0 ...}
OSG::FieldContainerType
+ _mfVertexShader {...}
OSG::PointerMField<OSG::ShaderProgram *,OSG::NoRefCountPolicy,0>
+ _mfGeometryShader {...}
OSG::PointerMField<OSG::ShaderProgram *,OSG::NoRefCountPolicy,0>
+ _mfFragmentShader {...}
OSG::PointerMField<OSG::ShaderProgram *,OSG::NoRefCountPolicy,0>
+ _sfVariables {...}
OSG::ChildPointerSField<OSG::ShaderProgramVariables
*,OSG::UnrecordedRefCountPolicy,1>
+ _mfVariableLocations {_values={...} _uiSharedWith=???
} OSG::MField<int,0,std::allocator<int> >
+ _mfProceduralVariableLocations {_values={...}
_uiSharedWith=??? } OSG::MField<int,0,std::allocator<int> >
+ _sfGeometryVerticesOut {_fieldValue=??? }
OSG::SField<unsigned int,0>
+ _sfGeometryInputType {_fieldValue=??? }
OSG::SField<unsigned int,1>
+ _sfGeometryOutputType {_fieldValue=??? }
OSG::SField<unsigned int,1>
+ _mfAttributes {_fieldType={...} _values={...}
_uiSharedWith=??? } OSG::MField<std::pair<unsigned
short,std::basic_string<char,std::char_traits<char>,std::allocator<char>
> >,0,std::allocator<std::pair<unsigned
short,std::basic_string<char,std::char_traits<char>,std::allocator<char>
> > > >
- _sfGLId {_fieldValue=??? } OSG::SField<unsigned
int,0>
_fieldValue CXX0030: Error: expression cannot be
evaluated
+ _sfPointSize {_fieldValue=??? }
OSG::SField<bool,2>
So, I suspect, that I do something fundamentally wrong here and hope to
get some insight into a proper handling of my application scenario.
After destroying of my dialog window, should the ShaderProgramChunk
contained in my main scene and hold by my main SceneManager be valid and
functioning?
Sorry for the lengthy mail...
Best,
Johannes
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