1 files changed, 120 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/bsdf_refraction.cpp b/intern/cycles/kernel/osl/bsdf_refraction.cpp
new file mode 100644
index 00000000000..3ae7a3811b4
--- /dev/null
+++ b/intern/cycles/kernel/osl/bsdf_refraction.cpp
@@ -0,0 +1,120 @@
+/*
+ * 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 RefractionClosure : public BSDFClosure {
+public:
+    Vec3  m_N;     // shading normal
+    float m_eta;   // ratio of indices of refraction (inside / outside)
+    RefractionClosure() : BSDFClosure(Labels::SINGULAR, Back) { }
+
+    void setup() {}
+
+    bool mergeable (const ClosurePrimitive *other) const {
+        const RefractionClosure *comp = (const RefractionClosure *)other;
+        return m_N == comp->m_N && m_eta == comp->m_eta &&
+            BSDFClosure::mergeable(other);
+    }
+
+    size_t memsize () const { return sizeof(*this); }
+
+    const char *name () const { return "refraction"; }
+
+    void print_on (std::ostream &out) const {
+        out << name() << " (";
+        out << "(" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "), ";
+        out << m_eta;
+        out << ")";
+    }
+
+    Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
+    {
+        return Color3 (0, 0, 0);
+    }
+
+    Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
+    {
+        return Color3 (0, 0, 0);
+    }
+
+    float albedo (const Vec3 &omega_out) const
+    {
+		return 1.0f;
+    }
+
+    ustring sample (const Vec3 &Ng,
+                 const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
+                 float randu, float randv,
+                 Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
+                 float &pdf, Color3 &eval) const
+    {
+        Vec3 R, dRdx, dRdy;
+        Vec3 T, dTdx, dTdy;
+        bool inside;
+
+        fresnel_dielectric(m_eta, m_N,
+                           omega_out, domega_out_dx, domega_out_dy,
+                           R, dRdx, dRdy,
+                           T, dTdx, dTdy,
+                           inside);
+
+        if (!inside) {
+            pdf = 1;
+            eval.setValue(1.0f, 1.0f, 1.0f);
+            omega_in = T;
+            domega_in_dx = dTdx;
+            domega_in_dy = dTdy;
+        }
+
+        return Labels::TRANSMIT;
+    }
+};
+
+ClosureParam bsdf_refraction_params[] = {
+    CLOSURE_VECTOR_PARAM(RefractionClosure, m_N),
+    CLOSURE_FLOAT_PARAM (RefractionClosure, m_eta),
+    CLOSURE_STRING_KEYPARAM("label"),
+    CLOSURE_FINISH_PARAM(RefractionClosure) };
+
+CLOSURE_PREPARE(bsdf_refraction_prepare, RefractionClosure)
+
+CCL_NAMESPACE_END
+