text: /*  Sirikata
   *  OgreMeshRaytrace.hpp
   *
   *  Copyright (c) 2009, Patrick Horn
   *  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 Sirikata 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.
   */
  
  #ifndef _OGRE_MESH_HPP_
  #define _OGRE_MESH_HPP_
  
  #include <vector>
  #include "OgreVector3.h"
  namespace Ogre {
    class Entity;
    class SubMesh;
    class Ray;
  }
  
  namespace Sirikata { namespace Graphics {
  
  struct TriVertex {
    Ogre::Vector3 coord;
    float u;
    float v;
    TriVertex() {}
    TriVertex(const Ogre::Vector3& coord, float u, float v)
      : coord(coord), u(u), v(v) {
    }
  };
  
  struct Triangle {
    Triangle() {}
    Triangle(const TriVertex &v1, const TriVertex &v2, const TriVertex &v3) : v1(v1), v2(v2), v3(v3)
    {
    }
  
    TriVertex v1, v2, v3;
  };
  
  struct IntersectResult {
  	bool intersected;
  	double distance;
  	Vector3f normal;
  	Triangle tri;
  	float u;
  	float v;
  	IntersectResult()
  	: intersected(false),
  	  distance(std::numeric_limits<Ogre::Real>::max()),
  	  normal(Vector3f(0,0,0)),
  	  u(0),
  	  v(0) {}
  };
  
  /**
   * This class syncs Ogre::Meshes from the hardware and does ray intersection tests.
   */
  class OgreMesh {
  public:
    static Ogre::Ray transformRay(Ogre::Node *entity, const Ogre::Ray &original);
    static bool intersectTri(const Ogre::Ray &ray, IntersectResult &rtn, Triangle*itr, bool plane);
    void  intersect(Ogre::Node *node, const Ogre::Ray &ray, IntersectResult &res);
    OgreMesh(Ogre::SubMesh *submesh, bool texcoord, std::vector<TriVertex>&sharedVertices);
  protected:
    void syncFromOgreMesh(Ogre::SubMesh *mSubMesh, bool texcoord, std::vector<TriVertex>&sharedVertices);
    std::vector<Triangle> mTriangles;
  public:
    int64 size()const;
  };
  
  } }
  
  #endif
  