text: /*
  Copyright (c) 2012 Sony Pictures Imageworks Inc., et al.
  and
  All Rights Reserved.
  
  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.
  */
  
  
  // Extensions to Imath classes for use in OSL's internals.
  // 
  // The original Imath classes bear the "new BSD" license (same as
  // ours above) and this copyright:
  // Copyright (c) 2002, Industrial Light & Magic, a division of
  // Lucas Digital Ltd. LLC.  All rights reserved.
  
  
  #pragma once
  
  // Might be worth trying to use #pragma clang force_cuda_host_device_[begin/end]
  // and include the real _cuda.h.
  
  #ifndef __CUDACC__
  #include <OpenEXR/ImathVec.h>
  #include <OpenEXR/ImathMatrix.h>
  #include <OpenEXR/ImathColor.h>
  #else
  #define IMATH_HOSTDEVICE __host__ __device__
  #include <OSL/ImathLimits_cuda.h>
  #include <OSL/ImathVec_cuda.h>
  #include <OSL/ImathMatrix_cuda.h>
  #include <OSL/ImathColor_cuda.h>
  #endif
  
  
  // Extensions to Imath
  #include <OSL/matrix22.h>
  
  
  OSL_NAMESPACE_ENTER
  
  
  /// 3x3 matrix transforming a 3-vector.  This is curiously not supplied
  /// by Imath, so we define it ourselves.
  template <class S, class T>
  inline OSL_HOSTDEVICE void
  multMatrix (const Imath::Matrix33<T> &M, const Imath::Vec3<S> &src,
              Imath::Vec3<S> &dst)
  {
      S a = src[0] * M[0][0] + src[1] * M[1][0] + src[2] * M[2][0];
      S b = src[0] * M[0][1] + src[1] * M[1][1] + src[2] * M[2][1];
      S c = src[0] * M[0][2] + src[1] * M[1][2] + src[2] * M[2][2];
      dst[0] = a;
      dst[1] = b;
      dst[2] = c;
  }
  
  
  /// Express dot product as a function rather than a method.
  template<class T>
  inline OSL_HOSTDEVICE T
  dot (const Imath::Vec2<T> &a, const Imath::Vec2<T> &b)
  {
      return a.dot (b);
  }
  
  
  /// Express dot product as a function rather than a method.
  template<class T>
  inline OSL_HOSTDEVICE T
  dot (const Imath::Vec3<T> &a, const Imath::Vec3<T> &b)
  {
      return a.dot (b);
  }
  
  
  
  /// Return the determinant of a 2x2 matrix.
  template <class T>
  inline OSL_HOSTDEVICE
  T determinant (const Imathx::Matrix22<T> &m)
  {
      return m[0][0]*m[1][1] - m[0][1]*m[1][0];
  }
  
  
  OSL_NAMESPACE_EXIT
  