Hi Carsten,
On 25.04.2012 16:44, Carsten Neumann wrote:
> Hello Christoph,
>
> On 04/25/2012 04:09 AM, "Christoph Fünfzig" wrote:
>> I am wondering if separating a ChunkMaterial into two parts might be
>> possible:
>> The first containing a SimpleSHLChunk for several childs:
>> OSG::SimpleSHLChunkUnrecPtr shl = OSG::SimpleSHLChunk::create();
>> shl->setVertexProgram (_vp_program);
>> shl->setFragmentProgram(_fp_program);
>> // common parameters:
>> shl->addUniformVariable("texScale0",
>> OSG::Vec2f(1.0f/OSG::Real32(numTiles), 1.0f/OSG::Real32(numTiles)));
>> shl->addUniformVariable("texScale1", OSG::Vec2f(1.0f, 1.0f));
>> // uniform sampler2D
>> shl->addUniformVariable("tex_alpha", 0);
>> shl->addUniformVariable("tex_ground", 1);
>> shl->addUniformVariable("tex_detail1", 2);
>> shl->addUniformVariable("tex_height", 3);
>> shl->addUniformVariable("tex_gradient", 4);
>>
>> and a second containing special variables (scalings, coords) for a specific
>> child node:
>> OSG::SimpleSHLVariableChunkUnrecPtr shlparam =
>> OSG::SimpleSHLVariableChunk::create();
>> shlparam->addUniformVariable("texOrigin0",
>> OSG::Vec2f(tx/OSG::Real32(numTiles),ty/OSG::Real32(numTiles)));
>> shlparam->addUniformVariable("tileCoord", OSG::Pnt2f(tx, ty));
>> shlparam->addUniformVariable("tileOrigin", OSG::Pnt2f(-skySize,
>> -skySize));
>> shlparam->addUniformVariable("decimate", 10.0f);
>>
>> Is this possible or intended with an ChunkOverrideGroup containing the first?
>
> the shader chunks can be composed with ChunkOverrideGroups (so they
> behave a bit odd in the sense that they are not really overridden, but
> aggregated instead). I'm not 100% sure if that works with SimpleSHLChunk
> or if you need to use ShaderProgramChunk and ShaderProgramVariableChunk.
>
> Gerrit: Can you help out here?
>
Well, I included ShaderProgramChunk and ShaderProgramVariableChunk:
1>c:\opensg2\opensg\source\system\state\shl\OSGShaderParameterChunkBase.h(105)
: error C2146: erreur de syntaxe : absence de ';' avant l'identificateur
'MFParametersType'
1>c:\opensg2\opensg\source\system\state\shl\OSGShaderParameterChunkBase.h(105)
: error C4430: spécificateur de type manquant - int est pris en compte par
défaut. Remarque : C++ ne prend pas en charge int par défaut
1>c:\opensg2\opensg\source\system\state\shl\OSGShaderParameterChunkBase.h(105)
: error C4430: spécificateur de type manquant - int est pris en compte par
défaut. Remarque : C++ ne prend pas en charge int par défaut
It seems to miss a type "MFUnrecChildShaderParameterPtr" (Windows 7, 64bit).
>> Does it have benefits to do so?
>
> Your application has to keep track of only one place to change uniform
> values for groups of objects.
>
Yes, definitely. But does it also have benefits for state sorting?
Is it on whole states or on state chunks level?
Thanks,
Christoph
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