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feat(ugc): ray_backend=embree-gpu traces on Intel GPUs with Embree's SYCL (optional build)

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The third ray backend, so every machine has a library for it: Embree on x86
CPUs (embree), HIPRT on AMD and NVIDIA GPUs (hiprt), Embree through SYCL on
Intel Arc and Xe GPUs (embree-gpu).

- CMake option DLU_EMBREE_SYCL (off). dUgcServer/EmbreeSycl is a project of
  its own built by a SYCL compiler (DLU_SYCL_CXX; icpx through ONEAPI_ROOT or
  the path, or the open source DPC++'s clang++ through DPCPP_ROOT) as an
  external project: Embree 4.4 with EMBREE_SYCL_SUPPORT, linked statically and
  bound inside (-Bsymbolic, only its C functions exported, so it never meets
  the servers' own Embree), and the GPU kernels (nearest hit skipping a ray's
  triangle, any hit), into libdlu_embree_sycl next to the servers
- UgcRaysEmbreeGpu loads it the first time embree-gpu is asked for; one GPU for
  the process (embree_gpu_device picks it), the workers take turns, the
  occlusion rays in batches as for hiprt
- without the build, the library or a supported Intel GPU it falls back to
  embree and says why (the UGC server's log at start, --make-model on stderr)
- the option names, the settings page, the dashboard's picker, /reprocessproperty

Verified here: the default build and ctest; the SYCL build with the open source
DPC++ 7.1.0 (compiles, links against oneAPI's libsycl.so.9, exports only its C
functions); on this machine (no Intel GPU) it loads, finds no GPU and falls
back to embree. Not verified: tracing on an Intel GPU (none here).

Check: on a machine with an Intel Arc or Xe GPU and oneAPI, configure with
-DDLU_EMBREE_SYCL=ON and run UgcServer --make-model x.lxfml out embree-gpu;
the UGC tests then compare it with Embree.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-29 12:28:33 -05:00
parent a7defdb326
commit db63fd2919
18 changed files with 604 additions and 31 deletions
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7
resources/ugcconfig.ini
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@@ -136,11 +136,12 @@ remove_hidden_faces=1
hsr_ground_plane=0
hsr_resolution=1024
# What traces the occlusion rays: embree (Intel Embree on the CPU) or
# hiprt (the GPU, when built with DLU_HIPRT and the machine has one; else embree). hiprt_device: which GPU (0: the first
# HIP or CUDA device; restart to change).
# What traces the occlusion rays: embree (Intel Embree on the CPU), hiprt (AMD or NVIDIA GPUs, when built with
# DLU_HIPRT) or embree-gpu (Intel Arc or Xe GPUs, when built with DLU_EMBREE_SYCL); without the build or the GPU,
# embree. hiprt_device and embree_gpu_device: which GPU (0: the first; restart to change).
ray_backend=embree
hiprt_device=0
embree_gpu_device=0
# denoise: off, or oidn (when built with DLU_OIDN; else off): a model's icon is drawn from its colors before the
# occlusion bake with its occlusion traced per pixel (denoise_samples rays from each pixel of the supersampled image)