Posted by Wade Walker on Feb 25, 2017; 6:09pm
URL: https://forum.jogamp.org/How-to-queue-in-a-multidevice-environment-tp4037674p4037675.html

Hi Arnold,

For these kind of questions, the ultimate resource is probably the OpenCL spec (https://www.khronos.org/registry/OpenCL/specs/opencl-2.1.pdf) and the official OpenCL docs (https://www.khronos.org/registry/OpenCL/sdk/2.1/docs/man/xhtml/). They go into far more detail than I could in a forum post :)

For examples of using JOCL's object-oriented features, the tests at https://github.com/WadeWalker/jocl/tree/master/test/com/jogamp/opencl and the demos at https://github.com/WadeWalker/jocl-demos are the best resource. Or, if you want to program OpenCL in a way similar to how it's used from C/C++, you can do it like in the "low-level bindings" test (https://github.com/WadeWalker/jocl/blob/master/test/com/jogamp/opencl/LowLevelBindingTest.java).

The JOCL low-level bindings are just a thin wrapper around the C functions, so they should work just as explained in the official OpenCL docs, except for the use of ByteBuffers in place of array and pointer arguments. This way of programming is a little more painful than using JOCL's object-oriented features, but since it's more like the non-Java use of OpenCL, it's easier to find help for it on places like StackOverflow and to compare it to the official Khronos docs.

Lastly, don't be discouraged if OpenCL programming seems difficult to understand at first. It's like that for everyone :) It just takes practice and exposure to get used to.