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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
Download Patch File Download Diff File Expand all files Collapse all files

3
dDashboardServer/routes/SettingsCatalog.cpp
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@@ -498,8 +498,9 @@ namespace {
c.Add(Bool(UGC, "remove_hidden_faces", "Remove faces nobody can see", "The opaque bricks are rendered from 42 directions around the model; the triangles that show in none are removed. Faces seen only through openings or by bounced light go too.", true));
c.Add(Bool(UGC, "hsr_ground_plane", "Nothing seen from below", "Also removes what can only be seen from under the model.", false));
c.Add(Unit(Int(UGC, "hsr_resolution", "Detail of the visibility renders", "The size of each of the 42 renders; bigger keeps smaller visible faces.", "1024", 64, 4096), "pixels"));
c.Add(Labels(Choice(UGC, "ray_backend", "Ray tracer", "What traces the occlusion rays: embree (Intel Embree on the CPU) or hiprt (the GPU, when the server was built with it and has one; else embree). They give the same results but for rounding. Staff can pick another for one make when making models again.", "embree", { "embree", "hiprt" }), { "Embree (CPU)", "HIPRT (GPU)" }));
c.Add(Labels(Choice(UGC, "ray_backend", "Ray tracer", "What traces the occlusion rays: embree (Intel Embree on the CPU), hiprt (AMD or NVIDIA GPUs through HIPRT) or embree-gpu (Intel Arc or Xe GPUs through Embree's SYCL), each GPU one only when the server was built with it and has such a GPU (else embree). They give the same results but for rounding. Staff can pick another for one make when making models again.", "embree", { "embree", "hiprt", "embree-gpu" }), { "Embree (CPU)", "HIPRT (AMD or NVIDIA GPU)", "Embree (Intel GPU)" }));
c.Add(Int(UGC, "hiprt_device", "GPU for HIPRT", "Which GPU the hiprt ray tracer uses: 0 is the first HIP (AMD) or CUDA (NVIDIA) device.", "0", 0, 16, true));
c.Add(Int(UGC, "embree_gpu_device", "Intel GPU for Embree", "Which Intel GPU the embree-gpu ray tracer uses: 0 is the first Embree supports.", "0", 0, 16, true));
c.Add(Labels(Choice(UGC, "denoise", "Denoise icons", "oidn (when the server was built with Intel Open Image Denoise; else off): a model's icon is drawn from its colors before the occlusion bake, with its occlusion traced per pixel with a few rays and the noise removed by the denoiser, instead of the baked occlusion. The model itself keeps its baked occlusion (a denoiser only works on images).", "off", { "off", "oidn" }), { "Off", "Open Image Denoise" }));
c.Add(Int(UGC, "denoise_samples", "Denoised occlusion rays per pixel", "Occlusion rays traced from each pixel of a denoised icon (before it is scaled down, so 16 times as many per icon pixel); fewer is faster and noisier.", "4", 1, 256));
c.Add(Bool(UGC, "bake_ao", "Darken hidden corners", "Ambient occlusion baked into the vertex colors.", true));

2
dDashboardServer/static/js/ugc.js
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@@ -727,7 +727,7 @@
// ---- processing options: Make again's choices and the comparison of what made the models ----
var OPTION_LABELS = { embree: 'Embree (CPU)', hiprt: 'HIPRT (GPU)', off: 'Off', oidn: 'Open Image Denoise' };
var OPTION_LABELS = { embree: 'Embree (CPU)', hiprt: 'HIPRT (GPU)', 'embree-gpu': 'Embree (Intel GPU)', off: 'Off', oidn: 'Open Image Denoise' };
function loadOptions() {
return api.get('/api/ugc/options').then(function (d) {
if (!d.success) throw new Error(d.error || 'Failed');

4
dDashboardServer/templates/ugc.jinja2
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@@ -35,8 +35,8 @@
<details class="card mb-3" id="optionsCard">
<summary class="card-header py-2 small fw-semibold">Processing options compared</summary>
<div class="card-body py-2 small">
<p class="text-body-secondary mb-2">The ways of making models to compare: the ray tracer of the occlusion (Embree on the CPU, HIPRT on the
GPU) and denoising of icons. The settings pick the defaults; <b>Make again</b> can use others for a make (the options next
<p class="text-body-secondary mb-2">The ways of making models to compare: the ray tracer of the occlusion (Embree on the CPU, HIPRT on AMD or
NVIDIA GPUs, Embree on Intel GPUs) and denoising of icons. The settings pick the defaults; <b>Make again</b> can use others for a make (the options next
to it, or <code>/reprocessproperty embree oidn</code> in game).
Every make is counted under what made it: the averages per make below, each model's in the List view's Options column.</p>
<div class="table-responsive"><table class="table table-sm align-middle mb-0" id="optionsTable">