Method Update

LuaSTGPlus/ResourceMgr.cpp:84–186

	: m_pInstance(ref), m_fEmission((float)ref->GetParticleInfo().nEmission) {}

void ResParticle::ParticlePool::Update(float delta)
{
	static fcyRandomWELL512 s_ParticleRandomizer;

	const ParticleInfo& pInfo = m_pInstance->GetParticleInfo();

	if (m_iStatus == Status::Alive)
	{
		m_fAge += delta;
		if (m_fAge >= pInfo.fLifetime && pInfo.fLifetime >= 0.f)
			m_iStatus = Status::Sleep;
	}

	// ������������
	size_t i = 0;
	while (i < m_iAlive)
	{
		ParticleInstance& tInst = m_ParticlePool[i];
		tInst.fAge += delta;
		if (tInst.fAge >= tInst.fTerminalAge)
		{
			--m_iAlive;
			if (m_iAlive > i + 1)
				memcpy(&tInst, &m_ParticlePool[m_iAlive], sizeof(ParticleInstance));
			continue;
		}

		// �����߼��ٶȺ�������ٶ�
		fcyVec2 vecAccel = (tInst.vecLocation - m_vCenter).GetNormalize();
		fcyVec2 vecAccel2 = vecAccel;
		vecAccel *= tInst.fRadialAccel;
		// vecAccel2.Rotate(M_PI_2);
		std::swap(vecAccel2.x, vecAccel2.y);
		vecAccel2.x = -vecAccel2.x;
		vecAccel2 *= tInst.fTangentialAccel;

		// �����ٶ�
		tInst.vecVelocity += (vecAccel + vecAccel2) * delta;
		tInst.vecVelocity.y += tInst.fGravity * delta;

		// �����
		tInst.vecLocation += tInst.vecVelocity * delta;

		// ���������ʹ�С
		tInst.fSpin += tInst.fSpinDelta * delta;
		tInst.fSize += tInst.fSizeDelta * delta;
		tInst.colColor[0] += tInst.colColorDelta[0] * delta;
		tInst.colColor[1] += tInst.colColorDelta[1] * delta;
		tInst.colColor[2] += tInst.colColorDelta[2] * delta;
		tInst.colColor[3] += tInst.colColorDelta[3] * delta;
		
		++i;
	}

	// �����µ�����
	if (m_iStatus == Status::Alive)
	{
		float fParticlesNeeded = m_fEmission * delta + m_fEmissionResidue;