1 files changed, 122 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/bssrdf.cpp b/intern/cycles/kernel/osl/bssrdf.cpp
new file mode 100644
index 00000000000..7c7f1ce157f
--- /dev/null
+++ b/intern/cycles/kernel/osl/bssrdf.cpp
@@ -0,0 +1,122 @@
+/*
+ * Adapted from Open Shading Language with this license:
+ *
+ * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
+ * All Rights Reserved.
+ *
+ * Modifications Copyright 2011, Blender Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * * Neither the name of Sony Pictures Imageworks nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <OSL/genclosure.h>
+
+#include "kernel/device/cpu/compat.h"
+#include "kernel/osl/closures.h"
+
+// clang-format off
+#include "kernel/types.h"
+
+#include "kernel/closure/alloc.h"
+#include "kernel/closure/bsdf_util.h"
+#include "kernel/closure/bsdf_diffuse.h"
+#include "kernel/closure/bsdf_principled_diffuse.h"
+#include "kernel/closure/bssrdf.h"
+// clang-format on
+
+CCL_NAMESPACE_BEGIN
+
+using namespace OSL;
+
+static ustring u_burley("burley");
+static ustring u_random_walk_fixed_radius("random_walk_fixed_radius");
+static ustring u_random_walk("random_walk");
+
+class CBSSRDFClosure : public CClosurePrimitive {
+ public:
+  Bssrdf params;
+  float ior;
+  ustring method;
+
+  CBSSRDFClosure()
+  {
+    params.roughness = FLT_MAX;
+    params.anisotropy = 1.0f;
+    ior = 1.4f;
+  }
+
+  void setup(ShaderData *sd, uint32_t path_flag, float3 weight)
+  {
+    if (method == u_burley) {
+      alloc(sd, path_flag, weight, CLOSURE_BSSRDF_BURLEY_ID);
+    }
+    else if (method == u_random_walk_fixed_radius) {
+      alloc(sd, path_flag, weight, CLOSURE_BSSRDF_RANDOM_WALK_FIXED_RADIUS_ID);
+    }
+    else if (method == u_random_walk) {
+      alloc(sd, path_flag, weight, CLOSURE_BSSRDF_RANDOM_WALK_ID);
+    }
+  }
+
+  void alloc(ShaderData *sd, uint32_t path_flag, float3 weight, ClosureType type)
+  {
+    Bssrdf *bssrdf = bssrdf_alloc(sd, weight);
+
+    if (bssrdf) {
+      /* disable in case of diffuse ancestor, can't see it well then and
+       * adds considerably noise due to probabilities of continuing path
+       * getting lower and lower */
+      if (path_flag & PATH_RAY_DIFFUSE_ANCESTOR) {
+        params.radius = make_float3(0.0f, 0.0f, 0.0f);
+      }
+
+      /* create one closure per color channel */
+      bssrdf->radius = params.radius;
+      bssrdf->albedo = params.albedo;
+      bssrdf->N = params.N;
+      bssrdf->roughness = params.roughness;
+      bssrdf->anisotropy = clamp(params.anisotropy, 0.0f, 0.9f);
+      sd->flag |= bssrdf_setup(sd, bssrdf, (ClosureType)type, clamp(ior, 1.01f, 3.8f));
+    }
+  }
+};
+
+ClosureParam *closure_bssrdf_params()
+{
+  static ClosureParam params[] = {
+      CLOSURE_STRING_PARAM(CBSSRDFClosure, method),
+      CLOSURE_FLOAT3_PARAM(CBSSRDFClosure, params.N),
+      CLOSURE_FLOAT3_PARAM(CBSSRDFClosure, params.radius),
+      CLOSURE_FLOAT3_PARAM(CBSSRDFClosure, params.albedo),
+      CLOSURE_FLOAT_KEYPARAM(CBSSRDFClosure, params.roughness, "roughness"),
+      CLOSURE_FLOAT_KEYPARAM(CBSSRDFClosure, ior, "ior"),
+      CLOSURE_FLOAT_KEYPARAM(CBSSRDFClosure, params.anisotropy, "anisotropy"),
+      CLOSURE_STRING_KEYPARAM(CBSSRDFClosure, label, "label"),
+      CLOSURE_FINISH_PARAM(CBSSRDFClosure)};
+  return params;
+}
+
+CCLOSURE_PREPARE(closure_bssrdf_prepare, CBSSRDFClosure)
+
+CCL_NAMESPACE_END