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https://github.com/minetest/irrlicht.git
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git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6000 dfc29bdd-3216-0410-991c-e03cc46cb475
195 lines
5.6 KiB
C++
195 lines
5.6 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CParticleMeshEmitter.h"
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#include "IrrCompileConfig.h"
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#ifdef _IRR_COMPILE_WITH_PARTICLES_
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#include "os.h"
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namespace irr
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{
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namespace scene
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{
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//! constructor
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CParticleMeshEmitter::CParticleMeshEmitter(
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IMesh* mesh, bool useNormalDirection,
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const core::vector3df& direction, f32 normalDirectionModifier,
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s32 mbNumber, bool everyMeshVertex,
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u32 minParticlesPerSecond, u32 maxParticlesPerSecond,
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const video::SColor& minStartColor, const video::SColor& maxStartColor,
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u32 lifeTimeMin, u32 lifeTimeMax, s32 maxAngleDegrees,
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const core::dimension2df& minStartSize,
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const core::dimension2df& maxStartSize )
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: Mesh(0), TotalVertices(0), MBCount(0), MBNumber(mbNumber),
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NormalDirectionModifier(normalDirectionModifier), Direction(direction),
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MaxStartSize(maxStartSize), MinStartSize(minStartSize),
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MinParticlesPerSecond(minParticlesPerSecond), MaxParticlesPerSecond(maxParticlesPerSecond),
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MinStartColor(minStartColor), MaxStartColor(maxStartColor),
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MinLifeTime(lifeTimeMin), MaxLifeTime(lifeTimeMax),
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Time(0), MaxAngleDegrees(maxAngleDegrees),
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EveryMeshVertex(everyMeshVertex), UseNormalDirection(useNormalDirection)
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{
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#ifdef _DEBUG
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setDebugName("CParticleMeshEmitter");
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#endif
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setMesh(mesh);
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}
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//! Prepares an array with new particles to emitt into the system
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//! and returns how much new particles there are.
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s32 CParticleMeshEmitter::emitt(u32 now, u32 timeSinceLastCall, SParticle*& outArray)
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{
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Time += timeSinceLastCall;
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const u32 pps = (MaxParticlesPerSecond - MinParticlesPerSecond);
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const f32 perSecond = pps ? ((f32)MinParticlesPerSecond + os::Randomizer::frand() * pps) : MinParticlesPerSecond;
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const f32 everyWhatMillisecond = 1000.0f / perSecond;
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if(Time > everyWhatMillisecond)
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{
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Particles.set_used(0);
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u32 amount = (u32)((Time / everyWhatMillisecond) + 0.5f);
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Time = 0;
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SParticle p;
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if(amount > MaxParticlesPerSecond * 2)
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amount = MaxParticlesPerSecond * 2;
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for(u32 i=0; i<amount; ++i)
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{
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if( EveryMeshVertex )
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{
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for( u32 j=0; j<Mesh->getMeshBufferCount(); ++j )
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{
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for( u32 k=0; k<Mesh->getMeshBuffer(j)->getVertexCount(); ++k )
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{
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p.pos = Mesh->getMeshBuffer(j)->getPosition(k);
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if( UseNormalDirection )
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p.vector = Mesh->getMeshBuffer(j)->getNormal(k) /
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NormalDirectionModifier;
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else
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p.vector = Direction;
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p.startTime = now;
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if( MaxAngleDegrees )
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{
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core::vector3df tgt = p.vector;
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tgt.rotateXYBy(os::Randomizer::frand() * MaxAngleDegrees);
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tgt.rotateYZBy(os::Randomizer::frand() * MaxAngleDegrees);
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tgt.rotateXZBy(os::Randomizer::frand() * MaxAngleDegrees);
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p.vector = tgt;
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}
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p.endTime = now + MinLifeTime;
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if (MaxLifeTime != MinLifeTime)
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p.endTime += os::Randomizer::rand() % (MaxLifeTime - MinLifeTime);
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if (MinStartColor==MaxStartColor)
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p.color=MinStartColor;
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else
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p.color = MinStartColor.getInterpolated(MaxStartColor, os::Randomizer::frand());
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p.startColor = p.color;
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p.startVector = p.vector;
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if (MinStartSize==MaxStartSize)
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p.startSize = MinStartSize;
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else
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p.startSize = MinStartSize.getInterpolated(MaxStartSize, os::Randomizer::frand());
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p.size = p.startSize;
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Particles.push_back(p);
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}
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}
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}
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else
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{
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const s32 randomMB = (MBNumber < 0) ? (os::Randomizer::rand() % MBCount) : MBNumber;
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u32 vertexNumber = Mesh->getMeshBuffer(randomMB)->getVertexCount();
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if (!vertexNumber)
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continue;
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vertexNumber = os::Randomizer::rand() % vertexNumber;
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p.pos = Mesh->getMeshBuffer(randomMB)->getPosition(vertexNumber);
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if( UseNormalDirection )
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p.vector = Mesh->getMeshBuffer(randomMB)->getNormal(vertexNumber) /
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NormalDirectionModifier;
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else
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p.vector = Direction;
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p.startTime = now;
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if( MaxAngleDegrees )
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{
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core::vector3df tgt = Direction;
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tgt.rotateXYBy(os::Randomizer::frand() * MaxAngleDegrees);
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tgt.rotateYZBy(os::Randomizer::frand() * MaxAngleDegrees);
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tgt.rotateXZBy(os::Randomizer::frand() * MaxAngleDegrees);
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p.vector = tgt;
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}
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p.endTime = now + MinLifeTime;
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if (MaxLifeTime != MinLifeTime)
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p.endTime += os::Randomizer::rand() % (MaxLifeTime - MinLifeTime);
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if (MinStartColor==MaxStartColor)
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p.color=MinStartColor;
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else
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p.color = MinStartColor.getInterpolated(MaxStartColor, os::Randomizer::frand());
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p.startColor = p.color;
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p.startVector = p.vector;
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if (MinStartSize==MaxStartSize)
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p.startSize = MinStartSize;
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else
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p.startSize = MinStartSize.getInterpolated(MaxStartSize, os::Randomizer::frand());
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p.size = p.startSize;
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Particles.push_back(p);
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}
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}
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outArray = Particles.pointer();
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return Particles.size();
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}
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return 0;
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}
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//! Set Mesh to emit particles from
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void CParticleMeshEmitter::setMesh(IMesh* mesh)
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{
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Mesh = mesh;
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TotalVertices = 0;
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MBCount = 0;
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VertexPerMeshBufferList.clear();
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if ( !Mesh )
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return;
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MBCount = Mesh->getMeshBufferCount();
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VertexPerMeshBufferList.reallocate(MBCount);
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for( u32 i = 0; i < MBCount; ++i )
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{
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VertexPerMeshBufferList.push_back( Mesh->getMeshBuffer(i)->getVertexCount() );
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TotalVertices += Mesh->getMeshBuffer(i)->getVertexCount();
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}
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}
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} // end namespace scene
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} // end namespace irr
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#endif // _IRR_COMPILE_WITH_PARTICLES_
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