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// This code contains NVIDIA Confidential Information and is disclosed to you
// under a form of NVIDIA software license agreement provided separately to you.
//
// Notice
// NVIDIA Corporation and its licensors retain all intellectual property and
// proprietary rights in and to this software and related documentation and
// any modifications thereto. Any use, reproduction, disclosure, or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA Corporation is strictly prohibited.
//
// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
//
// Information and code furnished is believed to be accurate and reliable.
// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// Copyright (c) 2008-2018 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
#ifndef SQ_AABBTREE_BUILD_H
#define SQ_AABBTREE_BUILD_H
#include "foundation/PxMemory.h"
#include "foundation/PxBounds3.h"
#include "PsUserAllocated.h"
#include "PsVecMath.h"
#include "SqTypedef.h"
#include "PsArray.h"
namespace physx
{
using namespace shdfnd::aos;
namespace Sq
{
//! Contains AABB-tree build statistics
struct BuildStats
{
BuildStats() : mCount(0), mTotalPrims(0) {}
PxU32 mCount; //!< Number of nodes created
PxU32 mTotalPrims; //!< Total accumulated number of primitives. Should be much higher than the source
//!< number of prims, since it accumulates all prims covered by each node (i.e. internal
//!< nodes too, not just leaf ones)
PX_FORCE_INLINE void reset() { mCount = mTotalPrims = 0; }
PX_FORCE_INLINE void setCount(PxU32 nb) { mCount = nb; }
PX_FORCE_INLINE void increaseCount(PxU32 nb) { mCount += nb; }
PX_FORCE_INLINE PxU32 getCount() const { return mCount; }
};
//! Contains AABB-tree build parameters
class AABBTreeBuildParams : public Ps::UserAllocated
{
public:
AABBTreeBuildParams(PxU32 limit = 1, PxU32 nb_prims = 0, const PxBounds3* boxes = NULL) :
mLimit(limit), mNbPrimitives(nb_prims), mAABBArray(boxes), mCache(NULL) {}
~AABBTreeBuildParams()
{
reset();
}
PX_FORCE_INLINE void reset()
{
mLimit = mNbPrimitives = 0;
mAABBArray = NULL;
PX_FREE_AND_RESET(mCache);
}
PxU32 mLimit; //!< Limit number of primitives / node. If limit is 1, build a complete tree (2*N-1 nodes)
PxU32 mNbPrimitives; //!< Number of (source) primitives.
const PxBounds3* mAABBArray; //!< Shortcut to an app-controlled array of AABBs.
PxVec3* mCache; //!< Cache for AABB centers - managed by build code.
};
class NodeAllocator;
//! AABB tree node used for building
class AABBTreeBuildNode : public Ps::UserAllocated
{
public:
PX_FORCE_INLINE AABBTreeBuildNode() {}
PX_FORCE_INLINE ~AABBTreeBuildNode() {}
PX_FORCE_INLINE const PxBounds3& getAABB() const { return mBV; }
PX_FORCE_INLINE const AABBTreeBuildNode* getPos() const { return mPos; }
PX_FORCE_INLINE const AABBTreeBuildNode* getNeg() const { const AABBTreeBuildNode* P = mPos; return P ? P + 1 : NULL; }
PX_FORCE_INLINE bool isLeaf() const { return !getPos(); }
PxBounds3 mBV; //!< Global bounding-volume enclosing all the node-related primitives
const AABBTreeBuildNode* mPos; //!< "Positive" & "Negative" children
PxU32 mNodeIndex; //!< Index of node-related primitives (in the tree's mIndices array)
PxU32 mNbPrimitives; //!< Number of primitives for this node
// Data access
PX_FORCE_INLINE PxU32 getNbPrimitives() const { return mNbPrimitives; }
PX_FORCE_INLINE PxU32 getNbRuntimePrimitives() const { return mNbPrimitives; }
PX_FORCE_INLINE void setNbRunTimePrimitives(PxU32 val) { mNbPrimitives = val; }
PX_FORCE_INLINE const PxU32* getPrimitives(const PxU32* base) const { return base + mNodeIndex; }
PX_FORCE_INLINE PxU32* getPrimitives(PxU32* base) { return base + mNodeIndex; }
// Internal methods
void subdivide(const AABBTreeBuildParams& params, BuildStats& stats, NodeAllocator& allocator, PxU32* const indices);
void _buildHierarchy(AABBTreeBuildParams& params, BuildStats& stats, NodeAllocator& allocator, PxU32* const indices);
};
// Progressive building
class FIFOStack;
//~Progressive building
//! For complete trees we can predict the final number of nodes and preallocate them. For incomplete trees we can't.
//! But we don't want to allocate nodes one by one (which would be quite slow), so we use this helper class to
//! allocate N nodes at once, while minimizing the amount of nodes allocated for nothing. An initial amount of
//! nodes is estimated using the max number for a complete tree, and the user-defined number of primitives per leaf.
//! In ideal cases this estimated number will be quite close to the final number of nodes. When that number is not
//! enough though, slabs of N=1024 extra nodes are allocated until the build is complete.
class NodeAllocator : public Ps::UserAllocated
{
public:
NodeAllocator();
~NodeAllocator();
void release();
void init(PxU32 nbPrimitives, PxU32 limit);
AABBTreeBuildNode* getBiNode();
AABBTreeBuildNode* mPool;
struct Slab
{
PX_FORCE_INLINE Slab() {}
PX_FORCE_INLINE Slab(AABBTreeBuildNode* pool, PxU32 nbUsedNodes, PxU32 maxNbNodes) : mPool(pool), mNbUsedNodes(nbUsedNodes), mMaxNbNodes(maxNbNodes) {}
AABBTreeBuildNode* mPool;
PxU32 mNbUsedNodes;
PxU32 mMaxNbNodes;
};
Ps::Array<Slab> mSlabs;
PxU32 mCurrentSlabIndex;
PxU32 mTotalNbNodes;
};
} // namespace Sq
}
#endif // SQ_AABBTREE_H
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