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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) 2008-2018 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 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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