Hello Gerrit,
On 06.05.2013 12:26, Gerrit Voß wrote:
>
> unfortunately there is currently the UInt16 limit, with other
> parts reducing the number of bits further (to 12 IIRC).
>
hmm...
> Currently the id's are also not reused, so if one creates
> and deletes a lot of shaders this will be a problem.
>
this forces a design question:
what I'm doing is the following. I have a really big model with a lot of
ChunkMaterials. A material might carry a shader program which I share
between all of the materials. E.g.:
mat->addChunk(spSceneManager->getMaterialShader(COOK_TORRANCE_MATERIAL_SHADER));
Now to handle the variable state I have added a variable chunk to each
of my materials and added uniforms to them as appropriate. Neither the
variable chunks nor the materials are shared in my model.
ShaderProgramVariableChunkUnrecPtr variableChunk =
ShaderProgramVariableChunk::create();
mat->addChunk(variableChunk);
variableChunk->addUniformVariable("uMaterial.ambient",
OSG::Color3f(colAmbient[0], colAmbient[1], colAmbient[2]));
variableChunk->addUniformVariable("uMaterial.diffuse",
OSG::Color3f(colDiffuse[0], colDiffuse[1], colDiffuse[2]));
...
If I remove this code the model renders fine (without shader).
I have chosen this layout because I thought that I can't share the
variable chunks because the uniforms carry a different state of the
material.
Currently, I have no infra structure to manage all of the materials from
a global position, i.e. share them between different geometries being in
the same visual state.
Is there a simpler way to handle the material state in a shader based
layout?
How do other handle such multiple material scenarios?
> For planning how to fix this, would it help in your case to
> reuse the id's. E.g. how many shader programs / shader
> executables do you have active at one point in time.
I do not know how I could reuse the ids. Actually, in my case no id is
freed at all.
Also I do not use so many shader programs. I have 17 shader programs
that are shared between the materials. Maybe some not so obvious shader
programs are in action but I doubt that.
So, do the ShaderProgramVariable introduce extra id usage?
What is your advise to handle my problem?
Best,
Johannes
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