Hi DC,
here is the link: https://github.com/nvpro-samples/gl_vk_meshlet_cadscene
This should help you with items 1) and 2)
For item 3) see my code below.
The way I assign the data structures in OSG is like that:
//----------------------//Create Meshlet primitive //----------------------
_geode->getOrCreateStateSet()->getOrCreateUniform(TASK_INVOCATIONS_PER_MESHLET,osg::Uniform::INT)->set(taskInvocationsPerMeshlet);
osg::ref_ptr<osg::Geometry>geometry=newosg::Geometry;
osg::ref_ptr<osg::ProxyPrimitive>proxyPrimitive=newosg::ProxyPrimitive;
proxyPrimitive->drawMeshTasks=newosg::DrawMeshTasks(0,workgroupsInGeometry*taskInvocationsPerMeshlet);
geometry->setUseDisplayList(false);
geometry->addPrimitiveSet(proxyPrimitive.get());
_geode->addChild(geometry);
//----------------------//Vertices
//----------------------
osg::ref_ptr<osg::Vec4Array>osgVertices=newosg::Vec4Array(toCopy);
for(autoi=0;i<toCopy;++i){ // fill array
//Fill buffer }
//Create BufferandTexture
osg::ref_ptr<osg::VertexBufferObject>verticesBufferObject=newosg::VertexBufferObject();
verticesBufferObject->setUsage(GL_DYNAMIC_READ_ARB);
osgVertices->setBufferObject(verticesBufferObject.get());
osg::ref_ptr<osg::TextureBuffer>vertexTexture=newosg::TextureBuffer(osgVertices.get());
vertexTexture->setInternalFormat(GL_RGBA32F_ARB);
vertexTexture->setInternalFormatMode(Texture::USE_USER_DEFINED_FORMAT);
stateSet->setTextureAttributeAndModes(MESH_VERTEX_ARRAY_TEXTURE_UNIT,vertexTexture.get());
//----------------------//MeshletInfos
//----------------------
osg::ref_ptr<Vec4uiArray>MeshletInfosArray=newVec4uiArray(workgroupsInGeometry);
intstartVertex=1;
intanzahl=_anzahlVertices;
for(autoi=0;i<workgroupsInGeometry;++i){
(*MeshletInfosArray)[i][0]=startVertex;
(*MeshletInfosArray)[i][1]=min(TS_WORKGROUP_SIZE,anzahl);
startVertex+=TS_WORKGROUP_STEP;
anzahl-=TS_WORKGROUP_STEP;
}
//Create BufferandTexture
osg::ref_ptr<osg::VertexBufferObject>meshInfosBufferObject=newosg::VertexBufferObject();
meshInfosBufferObject->setUsage(GL_DYNAMIC_READ_ARB);
MeshletInfosArray->setBufferObject(meshInfosBufferObject.get());
osg::ref_ptr<osg::TextureBuffer>meshInfosTexture=newosg::TextureBuffer(MeshletInfosArray.get());
meshInfosTexture->setInternalFormat(GL_RGBA32UI_EXT);
meshInfosTexture->setInternalFormatMode(Texture::USE_USER_DEFINED_FORMAT);
stateSet->setTextureAttributeAndModes(MESH_INFOS_ARRAY_TEXTURE_UNIT,meshInfosTexture.get());
//----------------------//Create and assign the Task- and Mesh shader as usual
by using the corresponding shader type
//----------------------
Am 10.05.2022 um 21:20 schrieb DC:
OK. Thank you.
On Tuesday, May 10, 2022 at 12:59:37 PM UTC-5 Werner Modenbach wrote:
Hi DC,
I think we should clarify some aspects before going into the details. If I
understand well, your problem can be split into 3 parts
1) You want to convert an existing model into meshlets. This is not related
to OSG. But I found a git repository from NVIDIA doing this job. I will lookup
the link and send
it to you tomorrow.
2) For this to work you need task/mesh shaders doing their job on the GPU.
This is also not related to OSG. Maybe you find some starting point in the
repository as well.
3) You need to know how to load your shader and how to setup the data
structures in OSG. I hope I can help you with that by providing some code
snippets.
Just let me know when you are ready for that step. But the code I provided
already should help you.
Werner
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