The header-only DAGR library provides a DSL closer to OpenCL for users of Khronos SYCL. This is used by the SYCL port of the KFusion component of the EPRSC Pamela SLAMBench project. Further details on DAGR are available here and in the following workshop paper:
Keir, P 2016, 'DAGR: A DSL for Legacy OpenCL Codes: Porting SLAMBench KFusion to SYCL' Paper presented at SYCL 2016 - The 1st SYCL Programming Workshop, Balcelona, Spain, 13/03/16