CODEWITHSUNDEEP
openglcudaogredepth-buffer
Ashwin Nanjappa
Ashwin Nanjappa

Reputation: 78538

How to pass depth buffer from OGRE to CUDA?

I am using OGRE for rendering some objects. At every frame, I would like to pass the resulting depth buffer to CUDA for running some kernels on it and computing a result.

How can I achieve this? How do I get access to the depth buffer in OGRE? How do I pass this to CUDA for processing? I do not need to write to the depth buffer in the CUDA kernels, it can be read-only.

Upvotes: 1

Views: 719

Answers (1)

c_k
c_k

Reputation: 1766

Passing buffers from Ogre to CUDA is possible like this:

LPDIRECT3DDEVICE9 mDevice;
renderWindow->getCustomAttribute("D3DDEVICE", (void*) &mDevice);

Ogre::HardwareVertexBufferSharedPtr vbuf =
    renderOp.vertexData->vertexBufferBinding->getBuffer(0); // or where your vertexData is stored.

Direct3DVertexBuffer9*  mD3D9VertexBuffer_1 =
static_cast<Ogre::D3D9HardwareVertexBuffer*>(vbuf.get())->getD3D9VertexBuffer();

Now you can do a cudaMemcopy(). More info: http://www.ogre3d.org/forums/viewtopic.php?f=5&t=47003&sid=a0b22c741f015e2fdf0a5862d12d2020&start=25

I have this working for the vertex buffer. I am not sure if this works correctly with a DepthBuffer, but at least you can try: IDirect3DSurface9* Ogre::D3D9Device::getDepthBuffer ( D3D9RenderWindow * renderWindow ). However I cannot find Information if this works or not (see http://www.ogre3d.org/docs/api/html/classOgre_1_1D3D9Device.html#a8e195a845ed22e0215d42abbc75d744e)

Upvotes: 2

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