Carsten Neumann wrote:
> 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?
Yup.
>> 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 ?
The first, i.e. the value there. In the crashing function, on top, the
this ptr is 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.
Ok. I'll see if I can dig at it a bit more.
Thanks!
Cheers,
/Marcus
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