Hello Marcus,
Marcus Lindblom wrote:
> I just compiled r2042 and something has broken, as I got a crash when
> trying to call addUniformVariable() on a SimpleSHLVariableChunk. This
> has worked before (r1874).
>
> I can't really find anything wrong with my code (which worked before),
> but you never know. Here it goes:
>
> OSGDicomVolume::OSGDicomVolume() :
> m_shader_mode(SM_FLUORO_SIM),
> m_16bit_size_threshold(450e6),
> m_material(ChunkMaterial::create()),
> m_parameters(OSG::SimpleSHLVariableChunk::create())
> {
> m_parameters->addUniformVariable("volume", 0); <--- crash
>
> m_parameters is a SimpleSHLVariableChunkRefPtr.
I assume OSGDicomVolume is not an OpenSG FieldContainer and instances of
it are only created after osgInit on threads OpenSG knows about?
> Here's how the callstack looks:
>
> OSGSystemD.dll!OSG::ShaderProgramVariables::addUniformVariable(const
> char * name=0x5019718c, int value=0,
> OSG::MField<int,0,std::allocator<int> > * pVarLoc=0x047c34fc,
> OSG::MField<int,0,std::allocator<int> > * pProcVarLoc=0x00000000) Line
> 361 + 0x13 bytes C++
>
> OrzDicomD.dll!OSG::SimpleSHLVariableChunk::addUniformVariable<int>(const
> char * name=0x5019718c, const int & value=0) Line 95 C++
>
> OrzDicomD.dll!orz::OSGDicomVolume::OSGDicomVolume() Line 29 C++
>
> The culprit for the crash is the _sfVariables member in
> SimpleSHLVariableChunk which is 0xcdcdcdcd, i.e. newly allocated memory
> that hasn't been written to yet.
> (http://www.nobugs.org/developer/win32/debug_crt_heap.html)
hm, _sfVariables is of type SFUnrecChildShaderProgramVariablesPtr, i.e.
it is a SField that stores a pointer to a ShaderProgramVariables object.
Is the value stored in the field 0xcdcdcdcd or the pointed-to memory, i.e.
is _sfVariables.getValue() == 0xcdcdcdcd
or is *reinterpret_cast<UInt32>(_sfVariables.getValue()) == 0xcdcdcdcd ?
SimpleSHLVariableChunk::addUniformVariable() creates the
ShaderProgramVariables objects if the pointer stored in the field is NULL.
It looks like creation of that object fails for some reason, but offhand
I don't have a good idea why that may be the case.
Cheers,
Carsten
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