Re: [PyCUDA] PyCuda: CUDA buffer into OpenGL texture
by Tomasz Rybak
It might be better to ask similar questions on the PyCUDA mailing list,
in CC.
Also - sorry it took so long to get to your email
On Tue, 2016-06-07 at 22:11 +1000, Lars Andersson wrote:
> Hi Tomasz,
>
> I was wondering if you could give me a quick summary of what is
> currently the best/quickest way to use some data generated by CUDA
> (via pycuda) as an OpenGL texture?
>
> I've been browsing around for a while but I'm not yet quite sure what
> the most efficient way is. I've seen examples using
> pycuda.gl.RegisterBuffer in combination with glTexSubImage2D (i.e the
> pycuda SobelFilter example) but I'm wondering if there's a better way
> to do it using pycuda.gl.RegisteredImage?
>
> Just a quick sequence of the API calls I need to use would be enough,
> and I can figure out the details myself.
>
Basically you need to create OpenGL object, then get handler (pointer)
to it and pass it to PyCUDA.
I was using something along the lines:
Preparation:
gl_object = create texture
cuda_buffer = pycuda.gl.RegisteredBuffer(long(gl_object),
GL_TEXTURE_2D)
And then in drawing:
cuda_object = cuda_buffer.map()
cuda_function.prepared_call((16, 16),
cuda_object.device_ptr_and_size()[0])
pycuda.driver.Context.synchronize()
cuda_object.unmap()
glDrawArrays()... and so on
Important thing is to synchronize between CUDA and OpenGL,
and never call CUDA kernels on currently drawn object.
Hope that helps.
Best regards.
--
Tomasz Rybak, Debian Maintainer <tomasz.rybak(a)post.pl>
GPG: A481 824E 7DD3 9C0E C40A 488E C654 FB33 2AD5 9860
http://member.acm.org/~tomaszrybak
2 years, 11 months
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