Hi all,
I am trying to use compute shaders in OpenSG but can't make them work.
The compute shader should modify the texture of a plane, but it never
gets activated.
My current setup is as follows: I load the OSGContribComputeBase Library
using OSG::preloadSharedObject("OSGContribComputeBase") Snippet before I
call osgInit(argc, argv). Then I set up my scene. The root has two
children: a node with a geometry core which consists of a plane with a
texture (ChunkMaterial with MaterialChunk, TextureObjectChunk and
TextureEnvChunk) and node with an AlgorithmComputeElement core which
holds the compute shader. The compute shader setup looks as follows
Snippet
NodeRecPtr computeNode = Node::create();
AlgorithmComputeElementRecPtr computeElement =
AlgorithmComputeElement::create();
ComputeShaderAlgorithmRecPtr computeAlgorithm =
ComputeShaderAlgorithm::create();
_comp = OSG::ComputeShaderChunk::create();
SnippetSnippet _comp->addUniformVariable("destTex", (int)
bottom_tex->getGLId());
_comp->addUniformVariable("roll", 0.0f);
_comp->setComputeProgram(_compute_program);
TextureImageChunkRecPtr tiChunk =
TextureImageChunk::create();
tiChunk->setTexture(bottom_tex);
tiChunk->setAccess(GL_WRITE_ONLY);
tiChunk->setFormat(GL_RGBA32F);
MFUnrecTextureImageChunkPtr * tiChunks =
computeAlgorithm->editMFTextureImages();
tiChunks->push_back(tiChunk);
computeAlgorithm->setDispatchConfig(OSG::Vec3i(64, 64, 1));
computeAlgorithm->setComputeShader(_comp);
computeElement->setAlgorithm(computeAlgorithm);
computeNode->setCore(computeElement);
_scene->addChild(computeNode);
The ComputeShaderChunk _comp is declared as global variable so that I
can change its uniform variables easily, and bottom_tex is the
TextureObejctChunk of the plane's material.
Is this setup correct or are there any other things I need to consider
when using compute shaders?
Kind regards,
Marcel
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