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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) 2008-2017 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 PARTICLE_EMITTER_H
#define PARTICLE_EMITTER_H
#include "ParticleFactory.h"
#include "PxTkRandom.h"
using namespace PxToolkit;
//----------------------------------------------------------------------------//
#define PARTICLE_EMITTER_RANDOMIZE_EMISSION 1
//----------------------------------------------------------------------------//
class ParticleEmitter : public SampleAllocateable
{
public:
struct Shape
{
enum Enum
{
eELLIPSE = 0,
eRECTANGLE = 1,
};
};
ParticleEmitter(Shape::Enum shape, PxReal extentX, PxReal extentY, PxReal spacing);
virtual ~ParticleEmitter();
// Relative to mFrameBody, or relative to global frame, if mFrameBody == NULL
void setLocalPose(const PxTransform& pose) { mLocalPose = pose; }
PxTransform getLocalPose() const { return mLocalPose; }
void setFrameRigidBody(PxRigidDynamic* rigidBody){ mFrameBody = rigidBody; }
PxRigidDynamic* getFrameRigidBody() const { return mFrameBody; }
void setRandomPos(PxVec3 t) { mRandomPos = t; }
PxVec3 getRandomPos() const { return mRandomPos; }
void setRandomAngle(PxReal t) { mRandomAngle = t; }
PxReal getRandomAngle() const { return mRandomAngle; }
void setVelocity(PxReal t) { mVelocity = t; }
PxReal getVelocity() const { return mVelocity; }
// Used for two way interaction, zero meaning, there is none
void setParticleMass(PxReal m) { mParticleMass = m; }
PxReal getParticleMass() const { return mParticleMass; }
void step(ParticleData& particles, PxReal dt, const PxVec3& externalAcceleration, PxReal maxParticleVelocity);
protected:
virtual void stepInternal(ParticleData& particles, PxReal dt, const PxVec3& externalAcceleration, PxReal maxParticleVelocity) = 0;
void initStep(ParticleData& particles, PxReal dt);
void finalizeStep();
PX_INLINE void computePositionNoise(PxVec3& posNoise);
void computeSiteVelocity(PxVec3& siteVel, const PxVec3& sitePos);
PX_INLINE bool isOutsideShape(PxU32 x, PxU32 y, PxReal offset) { return mShape == Shape::eELLIPSE && outsideEllipse(x, y, offset); }
static bool spawnParticle(
ParticleData& data,
PxU32& num,
const PxU32 max,
const PxVec3& position,
const PxVec3& velocity);
static PX_INLINE PxReal randInRange(PxReal a,PxReal b);
static PX_INLINE PxU32 randInRange(PxU32 range);
#if PARTICLE_EMITTER_RANDOMIZE_EMISSION
static PxToolkit::BasicRandom mRandom;
#endif
protected:
PxVec3 mRandomPos;
PxReal mRandomAngle;
PxReal mVelocity;
PxReal mParticleMass;
//derived quantities
PxU32 mNumSites;
PxU32 mNumX;
PxU32 mNumY;
PxReal mSpacingX;
PxReal mSpacingY;
PxReal mSpacingZ;
//only needed during step computations.
PxVec3 mAxisX;
PxVec3 mAxisY;
PxVec3 mAxisZ;
PxVec3 mBasePos;
private:
PX_INLINE bool outsideEllipse(PxU32 x, PxU32 y, PxReal offset);
void updateDerivedBase();
private:
PxTransform mLocalPose;
PxRigidDynamic* mFrameBody;
PxReal mExtentX;
PxReal mExtentY;
Shape::Enum mShape;
//state derived quantities
PxReal mEllipseRadius2;
PxReal mEllipseConstX0;
PxReal mEllipseConstX1;
PxReal mEllipseConstY0;
PxReal mEllipseConstY1;
//only needed during step computations.
PxVec3 mBodyAngVel;
PxVec3 mBodyLinVel;
PxVec3 mBodyCenter;
PxTransform mGlobalPose;
PxVec3 mLinMomentum;
PxVec3 mAngMomentum;
};
//----------------------------------------------------------------------------//
PX_INLINE bool ParticleEmitter::outsideEllipse(PxU32 x, PxU32 y, PxReal offset)
{
PxReal cX = (x + offset - mEllipseConstX0)*mEllipseConstX1;
PxReal cY = (y - mEllipseConstY0)*mEllipseConstY1;
return ( cX*cX + cY*cY >= mEllipseRadius2);
}
//----------------------------------------------------------------------------//
PX_INLINE void ParticleEmitter::computePositionNoise(PxVec3& posRand)
{
posRand.x = randInRange(-mRandomPos.x, mRandomPos.x);
posRand.y = randInRange(-mRandomPos.y, mRandomPos.y);
posRand.z = randInRange(-mRandomPos.z, mRandomPos.z);
}
//----------------------------------------------------------------------------//
PX_INLINE PxReal ParticleEmitter::randInRange(PxReal a, PxReal b)
{
#if PARTICLE_EMITTER_RANDOMIZE_EMISSION
return Rand(a, b);
#else
return a + (b-a)/2.0f;
#endif
}
//----------------------------------------------------------------------------//
PX_INLINE PxU32 ParticleEmitter::randInRange(PxU32 range)
{
#if PARTICLE_EMITTER_RANDOMIZE_EMISSION
PxU32 retval = Rand();
if(range > 0x7fff)
{
retval = (retval << 15) | Rand();
retval = (retval << 15) | Rand();
}
return retval % range;
#else
static PxU32 noRandomVal = 0;
return noRandomVal++;
#endif
}
//----------------------------------------------------------------------------//
#endif // PARTICLE_EMITTER_H
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