Hello Constantin,
Constantin Müller wrote:
> I read the mails to the topic, because I have a similar problem.
> The problem is, that I have texture on the graphics card that I don't
> want to copy back to the working memory.
> Now I want to put this texture onto an Object in the scene.
>
> I work with OpenSG 2.0 and I have to say I have not much knowledge about
> the FBOViewport, or how the stuff with the TextureChunk should work.
hm, the SimpleTextureMaterial is really only for simple cases and yours
does not quite qualify as simple any more ;)
OpenSG splits the OpenGL state into parts (called StateChunks). A
Material then often just becomes a bunch of chunks (e.g. a MaterialChunk
for the OpenGL material description, a TextureObjChunk to hold the
texture and a TextureEnvChunk to describe how the texture applies to the
geometry), so most materials you encounter are actually of type
ChunkMaterial.
For the case above where you have a texture on the GPU already and just
want to use it from OpenSG, create a ChunkMaterial and add a
TextureObjRefChunk (with the GLid field set to the id of the texture),
you may also want to add a MaterialChunk to set material properties for
lighting and a TextureEnvChunk.
> I'm trying to use the getGLID() functions one of you mentioned, but I
> got some problems with it.
> My approach is to create the OSG::Geometry with any Texture with
> OSG::Material and OSG::SimpleTexturedMaterial.
> Then I want to get the GLID() of the Texture and change this on the GPU
> with OpenGL commands.
> But how can I get access to the GLID() from the SimpleTexturedMaterial?
ok, here I'm afraid you lost me a little. Are you describing here how
you create the texture you want to change on the GPU in the first place?
My explanation above was about what to do if you have the GL id of a
texture (one that is created outside of OpenSG) and want to render some
OpenSG geometry with it.
If you want to use a texture in multiple places you can add the same
TextureObjChunk to multiple materials.
I'm not sure if this answers your question, if not could you please
provide some more details on how you create the texture (using OpenSG or
externally?), how you modify it on the GPU (do you use it as a render
target of an FBO?) and what you want to apply it to (OpenSG geometry?).
Cheers,
Carsten
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