genesis-3d_engine/Engine/addons/particles/affectors/particleMovementAffector.cc

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU

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#include "stdneb.h"
#include "particleMovementAffector.h"
#include "particles/particleaffector.h"
#include "particles/particlesystem.h"
#include "particles/particle.h"

namespace Particles
{
	using namespace Math;

	__ImplementClass(Particles::MovementAffector, CPFCC::AFFECTOR_MOVEMENT, Particles::ParticleAffector);

	//-----------------------------------------------------------------------
	MovementAffector::MovementAffector() : ParticleAffector()
	{
		mAffectType = AT_Movement;
		mMinMaxSpeed.SetScalar( 1.0f );
		mName = "MovementAffector";
	}
	//-----------------------------------------------------------------------
	void MovementAffector::_affect(Particle* particle)
	{		
		if(!GetEnable())
			return;
		float percent = particle->mTimeFraction;

		Math::float3	GravityPos(mMinMaxPosX.Calculate(percent,particle->mRandom0)
			, mMinMaxPosY.Calculate(percent,particle->mRandom1)
			, mMinMaxPosZ.Calculate(percent,particle->mRandom2)  );


		Math::float3 gravity = GravityPos;
		float  Gravity = mMinMaxSpeed.Calculate(percent,particle->mRandom3);
		gravity = gravity - particle->mPosition;
		gravity.normalise();
		particle->mDirection = (particle->mDirection + gravity*Gravity)/2.0f;

	}
	//-------------------------------------------------------------------------------
	void MovementAffector::InitShaderParam()
	{
		mShaderParam.x() = mMinMaxPosX.Calculate(0,Math::n_rand(0,1));
		mShaderParam.y() = mMinMaxPosY.Calculate(0,Math::n_rand(0,1));
		mShaderParam.z() = mMinMaxPosZ.Calculate(0,Math::n_rand(0,1));
		mShaderParam.w() = mMinMaxSpeed.Calculate(0,Math::n_rand(0,1));
	}
	void MovementAffector::SetShaderParam()
	{
		Graphic::GlobalMaterialParam* pGMP = Graphic::Material::GetGlobalMaterialParams();
		pGMP->SetVectorParam(Graphic::eGShaderParticleMovement,mShaderParam);
	}
	//--------------------------------------------------------------------------------
	void MovementAffector::SetShaderMask(const GPtr<ShaderProgramCompiler::ShaderMarcro>& pMarcro)
	{
		if(!GetEnable())
			return;
		pMarcro->TurnOn(ShaderProgramCompiler::ShaderMarcro::m_sParticleMovement);
	}
	//--------------------------------------------------------------------------------
	const Math::float3 MovementAffector::_getEndPos(const Math::float3& pos,const Math::float3 speed,float time)
	{
		Math::float3 endPos = pos;
		Math::float3 aimPos;
		aimPos.setFromFloat4(mShaderParam);
		Math::float3 dir = aimPos - pos;
		dir.normalise();
		dir *= mShaderParam.w();
		endPos += dir*time;

		return endPos;
	}
	//--------------------------------------------------------------------------------
	Math::MinMaxCurve* MovementAffector::getMinMaxCurve(ParticleCurveType pct)
	{
		switch(pct)
		{
		case 	Affector_MovementX:
			return &mMinMaxPosX;
		case 	Affector_MovementY:
			return &mMinMaxPosY;
		case 	Affector_MovementZ:
			return &mMinMaxPosZ;
		case 	Affector_MovementSpeed:
			return &mMinMaxSpeed;
		default:
			return NULL;					
		}
	}
}