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include/engine/core/geometry_kdtree.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NGEOMETRYKDTREE__
+#define	__NGEOMETRYKDTREE__
+
+
+		#include "core/geometry_tree.h"
+		#include "container/narray.h"
+		#include "container/nlist.h"
+
+
+namespace GS {
+	namespace Core {
+		class Geometry;
+
+/*!
+	@short	Geometry polygon KD-tree.
+	@author	Thomas Simonnet (thomas@movida-mail.com)
+*/
+class	GeometryKDTree : public IGeometryTree
+{
+private:
+
+	Array <sMaterial> material_table;
+	Array <uint> pol_index;
+
+	struct KDTreeNode
+	{
+		char	m_KDTREE_NODE_TYPE_SPLIT;
+		int		m_KDTREE_NODE_ID_ROPE[6];
+		float	m_KDTREE_NODE_AABB[6];
+		float	m_KDTREE_NODE_VALUE_SPLIT;
+		int		m_KDTREE_NODE_ID;
+		int		m_KDTREE_NODE_ID_CHILD_LEFT;
+		int		m_KDTREE_NODE_ID_CHILD_RIGHT;
+		bool	m_KDTREE_NODE_IS_LEAF;
+		int		m_KDTREE_NODE_COUNT_POLY;
+		int*	m_KDTREE_NODE_ID_VTX;
+		int*	m_KDTREE_NODE_ID_POLY;
+
+		KDTreeNode();
+		~KDTreeNode(){delete []m_KDTREE_NODE_ID_POLY; delete []m_KDTREE_NODE_ID_VTX;};
+	};
+ 	/*#define KDTREE_NODE_TYPE_SPLIT			0
+ 	#define KDTREE_NODE_ID_ROPE				1
+ 	#define KDTREE_NODE_AABB				25
+ 	#define KDTREE_NODE_VALUE_SPLIT			49
+ 	#define KDTREE_NODE_ID					53
+ 	#define KDTREE_NODE_ID_CHILD_LEFT		57
+ 	#define KDTREE_NODE_ID_CHILD_RIGHT		61
+ 	#define KDTREE_NODE_IS_LEAF				65
+ 	#define KDTREE_NODE_COUNT_POLY			66
+ 	#define KDTREE_NODE_ID_POLY				70
+*/
+	#define KDTREE_X_AXIS					0
+	#define KDTREE_Y_AXIS					1
+	#define KDTREE_Z_AXIS					2
+
+	#define KDTREE_SIDE_LEFT				0
+	#define KDTREE_SIDE_RIGHT				1
+	#define KDTREE_SIDE_BOTTOM				2
+	#define KDTREE_SIDE_TOP					3
+	#define KDTREE_SIDE_BACK				4
+	#define KDTREE_SIDE_FRONT				5
+
+	int m_count_bih;
+	float * m_TempFloatBih;
+
+	List <int> m_ArrayCountPoly;
+	List <Geometry*> m_PointerGeo;
+
+	KDTreeNode*	m_NodeTree;
+	int		m_SizeTree;
+
+	int* m_RealIdPoly;
+
+	float* m_Vtx;
+	Vector4* m_OptimizeEdgePoly;
+
+protected:
+
+		int					planeBoxOverlap(float normal[3], float vert[3], float maxbox[3]);
+		int					triBoxOverlap(float boxcenter[3],float boxhalfsize[3],float Verts1[3],float Verts2[3],float Verts3[3]);
+		int					GetKDtreeSideAABB(float* _AABB, Vector4 &_EntryPoint, int &_LastEntrySide);
+		bool				IntersectTriangle(const Vector4 &s, const Vector4 &d, float* Vtx1, float* Vtx2, float* Vtx3, Vector4* _Edge1, Vector4* _Edge2, float &l_Dist, float &u, float &v, bool& _Backface);
+		bool				AABBIntersectRay(float* _AABB, const Vector4 &o, const Vector4 &d, float &tmin, float &tmax);
+		void				CreateRope(int &_CurrentNode, int *_RopeArray);
+		void				IncreaseSizeNodeKdtreeBuffer(int _IncreaseSize);
+		void				CreateNodeKdtree(int &_CurrentNode, int *_IdPoly, int *_IdVtx, int _CountPoly, float *_Vtx, int _CountVtx, int _CurrentDepth);
+
+public:
+
+/*!
+	@name	KD-Tree specific functions.
+	@{
+*/
+		/// Retrieve the index of the closest KD-tree node to a given location in world space.
+		int					InsideKdTreeNode(const Vector4 &p, bool CheckInside=false);
+/// @}
+
+/*!
+	@name	Interface core functions.
+	@{
+*/
+		/// Raytrace the geometry tree.
+virtual	void				RaytraceGeometry(GeometryTrace &trace, const Vector4 &s, const Vector4 &d, float l = -1.f);
+		/// Build tree from a geometry.
+virtual	bool				BuildFromGeometry(ResourceFactory &gf, Geometry *geo);
+		/// Free all internal structures.
+virtual	void				Free();
+/// @}
+
+		GeometryKDTree();
+		~GeometryKDTree()
+		{	Free();	}
+};
+
+	} // Core
+} // GS
+
+
+#endif	// __NGEOMETRYKDTREE__