irrlicht/source/Irrlicht/CParticlePointEmitter.cpp

133 lines
4.5 KiB
C++

// Copyright (C) 2002-2009 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CParticlePointEmitter.h"
#include "os.h"
#include "IAttributes.h"
namespace irr
{
namespace scene
{
//! constructor
CParticlePointEmitter::CParticlePointEmitter(
const core::vector3df& direction, u32 minParticlesPerSecond,
u32 maxParticlesPerSecond, video::SColor minStartColor,
video::SColor maxStartColor, u32 lifeTimeMin, u32 lifeTimeMax,
s32 maxAngleDegrees,
const core::dimension2df& minStartSize,
const core::dimension2df& maxStartSize)
: Direction(direction),
MinStartSize(minStartSize), MaxStartSize(maxStartSize),
MinParticlesPerSecond(minParticlesPerSecond),
MaxParticlesPerSecond(maxParticlesPerSecond),
MinStartColor(minStartColor), MaxStartColor(maxStartColor),
MinLifeTime(lifeTimeMin), MaxLifeTime(lifeTimeMax),
MaxAngleDegrees(maxAngleDegrees), Time(0), Emitted(0)
{
#ifdef _DEBUG
setDebugName("CParticlePointEmitter");
#endif
}
//! Prepares an array with new particles to emitt into the system
//! and returns how much new particles there are.
s32 CParticlePointEmitter::emitt(u32 now, u32 timeSinceLastCall, SParticle*& outArray)
{
Time += timeSinceLastCall;
const u32 pps = (MaxParticlesPerSecond - MinParticlesPerSecond);
const f32 perSecond = pps ? (f32)MinParticlesPerSecond + (os::Randomizer::rand() % pps) : MinParticlesPerSecond;
const f32 everyWhatMillisecond = 1000.0f / perSecond;
if (Time > everyWhatMillisecond)
{
Time = 0;
Particle.startTime = now;
Particle.vector = Direction;
if (MaxAngleDegrees)
{
core::vector3df tgt = Direction;
tgt.rotateXYBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees);
tgt.rotateYZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees);
tgt.rotateXZBy((os::Randomizer::rand()%(MaxAngleDegrees*2)) - MaxAngleDegrees);
Particle.vector = tgt;
}
if (MaxLifeTime - MinLifeTime == 0)
Particle.endTime = now + MinLifeTime;
else
Particle.endTime = now + MinLifeTime + (os::Randomizer::rand() % (MaxLifeTime - MinLifeTime));
Particle.color = MinStartColor.getInterpolated(
MaxStartColor, (os::Randomizer::rand() % 100) / 100.0f);
Particle.startColor = Particle.color;
Particle.startVector = Particle.vector;
if (MinStartSize==MaxStartSize)
Particle.startSize = MinStartSize;
else
Particle.startSize = MinStartSize.getInterpolated(
MaxStartSize, (os::Randomizer::rand() % 100) / 100.0f);
Particle.size = Particle.startSize;
outArray = &Particle;
return 1;
}
return 0;
}
//! Writes attributes of the object.
void CParticlePointEmitter::serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options) const
{
out->addVector3d("Direction", Direction);
out->addInt("MinParticlesPerSecond", MinParticlesPerSecond);
out->addInt("MaxParticlesPerSecond", MaxParticlesPerSecond);
out->addColor("MinStartColor", MinStartColor);
out->addColor("MaxStartColor", MaxStartColor);
out->addInt("MinLifeTime", MinLifeTime);
out->addInt("MaxLifeTime", MaxLifeTime);
out->addInt("MaxAngleDegrees", MaxAngleDegrees);
}
//! Reads attributes of the object.
s32 CParticlePointEmitter::deserializeAttributes(s32 startIndex, io::IAttributes* in, io::SAttributeReadWriteOptions* options)
{
Direction = in->getAttributeAsVector3d("Direction");
if (Direction.getLength() == 0)
Direction.set(0,0.01f,0);
MinParticlesPerSecond = in->getAttributeAsInt("MinParticlesPerSecond");
MaxParticlesPerSecond = in->getAttributeAsInt("MaxParticlesPerSecond");
MinParticlesPerSecond = core::max_(1u, MinParticlesPerSecond);
MaxParticlesPerSecond = core::max_(MaxParticlesPerSecond, 1u);
MaxParticlesPerSecond = core::min_(MaxParticlesPerSecond, 200u);
MinParticlesPerSecond = core::min_(MinParticlesPerSecond, MaxParticlesPerSecond);
MinStartColor = in->getAttributeAsColor("MinStartColor");
MaxStartColor = in->getAttributeAsColor("MaxStartColor");
MinLifeTime = in->getAttributeAsInt("MinLifeTime");
MaxLifeTime = in->getAttributeAsInt("MaxLifeTime");
MaxAngleDegrees = in->getAttributeAsInt("MaxAngleDegrees");
MinLifeTime = core::max_(0u, MinLifeTime);
MaxLifeTime = core::max_(MaxLifeTime, MinLifeTime);
MinLifeTime = core::min_(MinLifeTime, MaxLifeTime);
return in->findAttribute("MaxAngleDegrees");
}
} // end namespace scene
} // end namespace irr