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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*
* OPCODE - Optimized Collision Detection
* Copyright (C) 2001 Pierre Terdiman
* Homepage: http://www.codercorner.com/Opcode.htm
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* Contains code for a versatile AABB tree.
* \file OPC_AABBTree.h
* \author Pierre Terdiman
* \date March, 20, 2001
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Include Guard
#ifndef __OPC_AABBTREE_H__
#define __OPC_AABBTREE_H__
#ifdef OPC_NO_NEG_VANILLA_TREE
//! TO BE DOCUMENTED
#define IMPLEMENT_TREE(base_class, volume) \
public: \
/* Constructor / Destructor */ \
base_class(); \
~base_class(); \
/* Data access */ \
inline_ const volume* Get##volume() const { return &mBV; } \
/* Clear the last bit */ \
inline_ const base_class* GetPos() const { return (const base_class*)(mPos&~1); } \
inline_ const base_class* GetNeg() const { const base_class* P = GetPos(); return P ? P+1 : null;} \
\
/* We don't need to test both nodes since we can't have one without the other */ \
inline_ bool IsLeaf() const { return !GetPos(); } \
\
/* Stats */ \
inline_ udword GetNodeSize() const { return SIZEOFOBJECT; } \
protected: \
/* Tree-independent data */ \
/* Following data always belong to the BV-tree, regardless of what the tree actually contains.*/ \
/* Whatever happens we need the two children and the enclosing volume.*/ \
volume mBV; /* Global bounding-volume enclosing all the node-related primitives */ \
size_t mPos; /* "Positive" & "Negative" children */
#else
//! TO BE DOCUMENTED
#define IMPLEMENT_TREE(base_class, volume) \
public: \
/* Constructor / Destructor */ \
base_class(); \
~base_class(); \
/* Data access */ \
inline_ const volume* Get##volume() const { return &mBV; } \
/* Clear the last bit */ \
inline_ const base_class* GetPos() const { return (const base_class*)(mPos&~1); } \
inline_ const base_class* GetNeg() const { return (const base_class*)(mNeg&~1); } \
\
/* inline_ bool IsLeaf() const { return (!GetPos() && !GetNeg()); } */ \
/* We don't need to test both nodes since we can't have one without the other */ \
inline_ bool IsLeaf() const { return !GetPos(); } \
\
/* Stats */ \
inline_ udword GetNodeSize() const { return SIZEOFOBJECT; } \
protected: \
/* Tree-independent data */ \
/* Following data always belong to the BV-tree, regardless of what the tree actually contains.*/ \
/* Whatever happens we need the two children and the enclosing volume.*/ \
volume mBV; /* Global bounding-volume enclosing all the node-related primitives */ \
size_t mPos; /* "Positive" child */ \
size_t mNeg; /* "Negative" child */
#endif
typedef void (*CullingCallback) (udword nb_primitives, udword* node_primitives, BOOL need_clipping, void* user_data);
class OPCODE_API AABBTreeNode
{
IMPLEMENT_TREE(AABBTreeNode, AABB)
public:
// Data access
inline_ const udword* GetPrimitives() const { return mNodePrimitives; }
inline_ udword GetNbPrimitives() const { return mNbPrimitives; }
protected:
// Tree-dependent data
udword* mNodePrimitives; //!< Node-related primitives (shortcut to a position in mIndices below)
udword mNbPrimitives; //!< Number of primitives for this node
// Internal methods
udword Split(udword axis, AABBTreeBuilder* builder);
bool Subdivide(AABBTreeBuilder* builder);
void _BuildHierarchy(AABBTreeBuilder* builder);
void _Refit(AABBTreeBuilder* builder);
};
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* User-callback, called for each node by the walking code.
* \param current [in] current node
* \param depth [in] current node's depth
* \param user_data [in] user-defined data
* \return true to recurse through children, else false to bypass them
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
typedef bool (*WalkingCallback) (const AABBTreeNode* current, udword depth, void* user_data);
class OPCODE_API AABBTree : public AABBTreeNode
{
public:
// Constructor / Destructor
AABBTree();
~AABBTree();
// Build
bool Build(AABBTreeBuilder* builder);
void Release();
// Data access
inline_ const udword* GetIndices() const { return mIndices; } //!< Catch the indices
inline_ udword GetNbNodes() const { return mTotalNbNodes; } //!< Catch the number of nodes
// Infos
bool IsComplete() const;
// Stats
udword ComputeDepth() const;
udword GetUsedBytes() const;
udword Walk(WalkingCallback callback, void* user_data) const;
bool Refit(AABBTreeBuilder* builder);
bool Refit2(AABBTreeBuilder* builder);
private:
udword* mIndices; //!< Indices in the app list. Indices are reorganized during build (permutation).
AABBTreeNode* mPool; //!< Linear pool of nodes for complete trees. Null otherwise. [Opcode 1.3]
// Stats
udword mTotalNbNodes; //!< Number of nodes in the tree.
};
#endif // __OPC_AABBTREE_H__
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