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physx/samples/pxtoolkit/include/PxTkRandom.h

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+//
+// 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 NVIDIA CORPORATION 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 ''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.
+//
+// Copyright (c) 2008-2021 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 PX_TOOLKIT_RANDOM_H
+#define PX_TOOLKIT_RANDOM_H
+
+#include "common/PxPhysXCommonConfig.h"
+#define TEST_MAX_RAND 0xffff
+
+namespace PxToolkit
+{
+	using namespace physx;
+
+	class BasicRandom
+	{
+		public:
+									BasicRandom(PxU32 seed=0)	: mRnd(seed)	{}
+									~BasicRandom()								{}
+
+		PX_FORCE_INLINE	void		setSeed(PxU32 seed)			{ mRnd = seed;											}
+		PX_FORCE_INLINE	PxU32		getCurrentValue()	const	{ return mRnd;											}
+						PxU32		randomize()					{ mRnd = mRnd * 2147001325 + 715136305; return mRnd;	}
+
+		PX_FORCE_INLINE	PxU32		rand()						{ return randomize() & 0xffff;							}
+		PX_FORCE_INLINE	PxU32		rand32()					{ return randomize() & 0xffffffff;						}
+
+						PxF32		rand(PxF32 a, PxF32 b)
+									{
+										const PxF32 r = rand32()/(static_cast<PxF32>(0xffffffff));
+										return r*(b-a) + a;
+									}
+
+						PxI32		rand(PxI32 a, PxI32 b)
+									{
+										return a + static_cast<PxI32>(rand32()%(b-a));
+									}
+
+						PxF32		randomFloat()
+									{
+										return rand()/(static_cast<PxF32>(0xffff)) - 0.5f;
+									}									
+						PxF32		randomFloat32()
+									{
+										return rand32()/(static_cast<PxF32>(0xffffffff)) - 0.5f;
+									}
+
+						PxF32		randomFloat32(PxReal a, PxReal b) { return rand32()/PxF32(0xffffffff)*(b-a)+a; }
+						void		unitRandomPt(physx::PxVec3& v);	
+						void		unitRandomQuat(physx::PxQuat& v);
+
+						PxVec3		unitRandomPt();
+						PxQuat		unitRandomQuat();
+
+	private:
+						PxU32		mRnd;
+	};
+
+	//--------------------------------------
+	// Fast, very good random numbers
+	//
+	// Period = 2^249
+	//
+	// Kirkpatrick, S., and E. Stoll, 1981; A Very Fast Shift-Register
+	//       Sequence Random Number Generator, Journal of Computational Physics,
+	// V. 40.
+	//
+	// Maier, W.L., 1991; A Fast Pseudo Random Number Generator,
+	// Dr. Dobb's Journal, May, pp. 152 - 157
+
+	class RandomR250
+	{
+	public:
+		RandomR250(PxI32 s); 
+
+		void	setSeed(PxI32 s);
+		PxU32	randI();
+		PxReal	randUnit();
+
+		PxReal rand(PxReal lower, PxReal upper)
+		{
+			return lower + randUnit() * (upper - lower);
+		}
+
+	private:
+		PxU32	mBuffer[250];
+		PxI32	mIndex;
+	};
+
+	void SetSeed(PxU32 seed);
+	PxU32 Rand();
+
+	PX_INLINE PxF32 Rand(PxF32 a,PxF32 b)
+	{
+		const PxF32 r = static_cast<PxF32>(Rand())/(static_cast<PxF32>(TEST_MAX_RAND));
+		return r*(b-a) + a;
+	}
+
+	PX_INLINE PxF32 RandLegacy(PxF32 a,PxF32 b)
+	{
+		const PxF32 r = static_cast<PxF32>(Rand())/(static_cast<PxF32>(0x7fff)+1.0f);
+		return r*(b-a) + a;
+	} 
+
+	//returns numbers from [a, b-1] 
+	PX_INLINE PxI32 Rand(PxI32 a,PxI32 b)
+	{
+		return a + static_cast<PxI32>(Rand()%(b-a));
+	}
+}
+
+#endif