using DCompute

[James Dean via Digitalmars-d-learn]

I'm interested in trying it out, says it's just for ldc. Can we 
simply compile it using ldc then import it and use dmd, ldc, or 
gdc afterwards?

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a SPIRV capable LLVM (available here to build ldc to to support 
SPIRV (required for OpenCL)).
or LDC built with any LLVM 3.9.1 or greater that has the NVPTX 
backend enabled, to support CUDA.
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Is the LDC from the download pages have these enabled?

Also, can DCompute or any GPU stuff efficiently render stuff 
because it is already on the GPU or does one sort of have to jump 
through hoops to, say, render a buffer?

e.g., suppose I want to compute a 3D mathematical function and 
visualize it's volume. Do I go in to the GPU, do the compute, 
back out to cpu, then to the graphics system(opengl/directX) or 
can I just essentially do it all from the gpu?