1 files changed, 105 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..66d7818e677
--- /dev/null
+++ b/intern/cycles/kernel/osl/bssrdf.cpp
@@ -0,0 +1,105 @@
+/*
+ * 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 <OpenImageIO/fmath.h>
+
+#include <OSL/genclosure.h>
+
+#include "osl_closures.h"
+
+CCL_NAMESPACE_BEGIN
+
+using namespace OSL;
+
+class BSSRDFCubicClosure : public BSSRDFClosure {
+public:
+    Color3 m_radius;
+    Color3 m_scale;
+    float  m_max_radius;
+
+    template <typename T>
+    static inline T pow3 (const T &x) { return x * x * x; }
+
+    template <typename T>
+    static inline T pow5 (const T &x) { T x2 = x * x; return x2 * x2 * x; }
+
+    BSSRDFCubicClosure() { }
+
+    void setup()
+    {
+        // pre-compute some terms
+        m_max_radius = 0;
+        for (int i = 0; i < 3; i++) {
+            m_scale[i] = m_radius[i] > 0 ? 4 / pow5 (m_radius[i]) : 0;
+            m_max_radius = std::max (m_max_radius, m_radius[i]);
+        }
+    }
+
+    bool mergeable (const ClosurePrimitive *other) const {
+        const BSSRDFCubicClosure *comp = (const BSSRDFCubicClosure *)other;
+        return m_radius == comp->m_radius && BSSRDFClosure::mergeable(other);
+    }
+
+    size_t memsize () const { return sizeof(*this); }
+
+    const char *name () const { return "bssrdf_cubic"; }
+
+    void print_on (std::ostream &out) const
+    {
+        out << name() << " ((" << m_radius[0] << ", " << m_radius[1] << ", " << m_radius[2] << "), ("
+            << m_scale[0] << ", " << m_scale[1] << ", " << m_scale[2] << "))";
+    }
+
+    Color3 eval (float r) const
+    {
+        return Color3 ((r < m_radius.x) ? pow3 (m_radius.x - r) * m_scale.x : 0,
+                       (r < m_radius.y) ? pow3 (m_radius.y - r) * m_scale.y : 0,
+                       (r < m_radius.z) ? pow3 (m_radius.z - r) * m_scale.z : 0);
+    }
+
+    float max_radius() const
+    {
+        return m_max_radius;
+    }
+};
+
+
+
+ClosureParam closure_bssrdf_cubic_params[] = {
+    CLOSURE_COLOR_PARAM (BSSRDFCubicClosure, m_radius),
+    CLOSURE_STRING_KEYPARAM ("label"),
+    CLOSURE_FINISH_PARAM(BSSRDFCubicClosure) };
+
+CLOSURE_PREPARE(closure_bssrdf_cubic_prepare, BSSRDFCubicClosure)
+
+CCL_NAMESPACE_END
+