Initial commit:

PhysX 3.4.0 Update @ 21294896
APEX 1.4.0 Update @ 21275617

[CL 21300167]

1 files changed, 162 insertions, 0 deletions

diff --git a/PhysX_3.4/Source/LowLevelParticles/src/PtSpatialHashHelper.h b/PhysX_3.4/Source/LowLevelParticles/src/PtSpatialHashHelper.h
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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) 2008-2016 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 PT_SPATIAL_HASH_HELPER_H
+#define PT_SPATIAL_HASH_HELPER_H
+
+#include "PxPhysXConfig.h"
+#if PX_USE_PARTICLE_SYSTEM_API
+
+#include "PtParticleCell.h"
+
+namespace physx
+{
+
+namespace Pt
+{
+
+PX_FORCE_INLINE PxU32 hashFunction(const GridCellVector& coord, PxU32 numHashBuckets)
+{
+	PX_ASSERT((((numHashBuckets - 1) ^ numHashBuckets) + 1) == (2 * numHashBuckets));
+
+	return ((static_cast<PxU32>(coord.x) + 101 * static_cast<PxU32>(coord.y) + 7919 * static_cast<PxU32>(coord.z)) &
+	        (numHashBuckets - 1));
+	// sschirm: weird! The version that spreads all the coordinates is slower! Is the reason the additional
+	// multiplication?
+	// return ( (101*static_cast<PxU32>(coord.x) + 7919*static_cast<PxU32>(coord.y) +
+	// 73856093*static_cast<PxU32>(coord.z)) & (numHashBuckets - 1) );
+}
+
+PX_FORCE_INLINE PxU32 getCellIndex(const GridCellVector& coord, const ParticleCell* cells, PxU32 numHashBuckets)
+{
+#if PX_DEBUG
+	PxU32 tries = 0;
+#endif
+
+	PxU32 key = hashFunction(coord, numHashBuckets);
+	const ParticleCell* cell = &cells[key];
+
+	while((cell->numParticles != PX_INVALID_U32) && (coord != cell->coords))
+	{
+		key = (key + 1) & (numHashBuckets - 1);
+		cell = &cells[key];
+
+#if PX_DEBUG
+		tries++;
+#endif
+		PX_ASSERT(tries < numHashBuckets);
+	}
+
+	return key;
+}
+
+/*
+Compute packet section index for given cell coordinate. The packet sections are indexed as follows.
+
+Left packet boundary      Front packet boundary      Top packet boundary
+__________________        __________________         __________________
+| 3 |   5    | 4 |        | 4 |   22   |13 |         | 3 |   21   |12 |
+|___|________|___|        |___|________|___|         |___|________|___|
+|   |        |   |        |   |        |   |         |   |        |   |
+| 6 |   8    | 7 |        | 7 |   25   |16 |         | 5 |   23   |14 |
+|   |        |   |        |   |        |   |         |   |        |   |
+|___|________|___|        |___|________|___|         |___|________|___|
+| 0 |   2    | 1 |        | 1 |   19   |10 |         | 4 |   22   |13 |
+|___|________|___|        |___|________|___|         |___|________|___|
+
+Right packet boundary     Rear packet boundary       Bottom packet boundary
+__________________        __________________         __________________
+|13 |   14   |12 |        |12 |   21   | 3 |         | 1 |   19   |10 |
+|___|________|___|        |___|________|___|         |___|________|___|
+|   |        |   |        |   |        |   |         |   |        |   |
+|16 |   17   |15 |        |15 |   24   | 6 |         | 2 |   20   |11 |
+|   |        |   |        |   |        |   |         |   |        |   |
+|___|________|___|        |___|________|___|         |___|________|___|
+|10 |   11   | 9 |        |9  |   18   | 0 |         | 0 |   18   | 9 |
+|___|________|___|        |___|________|___|         |___|________|___|
+
+Note: One section is missing in this illustration. Section 26 is in the middle of the packet and
+      enclosed by the other sections. For particles in section 26 we know for sure that no interaction
+      with particles of neighboring packets occur.
+*/
+PX_FORCE_INLINE PxU32
+getPacketSectionIndex(const GridCellVector& cellCoords, const GridCellVector& packetMinCellCoords, PxU32 packetMult)
+{
+	PxU32 sectionIndex = 0;
+
+	// Translate cell coordinates such that the minimal cell coordinate of the packet is at the origin (0,0,0)
+	GridCellVector coord(cellCoords);
+	coord -= packetMinCellCoords;
+
+	// Find section the particle cell belongs to.
+
+	if(PxU32(coord.x + 1) == packetMult)
+	{
+		// Right side boundary of packet
+		sectionIndex = 9;
+	}
+	else if(coord.x != 0)
+	{
+		sectionIndex = 18;
+	}
+	// else: Left side boundary of packet
+
+	//-----------
+
+	if(PxU32(coord.y + 1) == packetMult)
+	{
+		// Top boundary of packet
+		sectionIndex += 3;
+	}
+	else if(coord.y != 0)
+	{
+		sectionIndex += 6;
+	}
+	// else: Bottom boundary of packet
+
+	//-----------
+
+	if(PxU32(coord.z + 1) == packetMult)
+	{
+		// Front boundary of packet
+		sectionIndex += 1;
+	}
+	else if(coord.z != 0)
+	{
+		sectionIndex += 2;
+	}
+	// else: Rear boundary of packet
+
+	return sectionIndex;
+}
+
+} // namespace Pt
+} // namespace physx
+
+#endif // PX_USE_PARTICLE_SYSTEM_API
+#endif // PT_SPATIAL_HASH_HELPER_H