text: //
  // Copyright 2016 Pixar
  //
  // Licensed under the Apache License, Version 2.0 (the "Apache License")
  // with the following modification; you may not use this file except in
  // compliance with the Apache License and the following modification to it:
  // Section 6. Trademarks. is deleted and replaced with:
  //
  // 6. Trademarks. This License does not grant permission to use the trade
  //    names, trademarks, service marks, or product names of the Licensor
  //    and its affiliates, except as required to comply with Section 4(c) of
  //    the License and to reproduce the content of the NOTICE file.
  //
  // You may obtain a copy of the Apache License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the Apache License with the above modification is
  // distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied. See the Apache License for the specific
  // language governing permissions and limitations under the Apache License.
  //
  #ifndef HDEMBREE_CONTEXT_H
  #define HDEMBREE_CONTEXT_H
  
  #include "pxr/pxr.h"
  
  #include "pxr/imaging/hdEmbree/sampler.h"
  
  #include "pxr/base/gf/matrix4f.h"
  #include "pxr/base/vt/array.h"
  
  #include <embree2/rtcore.h>
  
  PXR_NAMESPACE_OPEN_SCOPE
  
  class HdRprim;
  
  /// \class HdEmbreePrototypeContext
  ///
  /// A small bit of state attached to each bit of prototype geometry in embree,
  /// for the benefit of HdEmbreeRenderPass::_TraceRay.
  ///
  struct HdEmbreePrototypeContext
  {
      /// A pointer back to the owning HdEmbree rprim.
      HdRprim *rprim;
      /// A name-indexed map of primvar samplers.
      TfHashMap<TfToken, HdEmbreePrimvarSampler*, TfToken::HashFunctor>
          primvarMap;
      /// A copy of the primitive params for this rprim.
      VtIntArray primitiveParams;
  };
  
  ///
  /// \class HdEmbreeInstanceContext
  ///
  /// A small bit of state attached to each bit of instanced geometry in embree,
  /// for the benefit of HdEmbreeRenderPass::_TraceRay.
  ///
  struct HdEmbreeInstanceContext
  {
      /// The object-to-world transform, for transforming normals to worldspace.
      GfMatrix4f objectToWorldMatrix;
      /// The scene the prototype geometry lives in, for passing to
      /// rtcInterpolate.
      RTCScene rootScene;
      /// The instance id of this instance.
      int32_t instanceId;
  };
  
  
  PXR_NAMESPACE_CLOSE_SCOPE
  
  #endif // HDEMBREE_CONTEXT_H
  