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/* Copyright (C) 2011 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_PARTICLEEMITTERTYPE
#define INCLUDED_PARTICLEEMITTERTYPE
#include "graphics/Texture.h"
#include "lib/ogl.h"
#include "lib/file/vfs/vfs_path.h"
#include "maths/BoundingBoxAligned.h"
class CVector3D;
class CParticleEmitter;
class CParticleManager;
class IParticleVar;
class IParticleEffector;
/**
* Particle emitter type - stores the common state data for all emitters of that
* type, and uses that data to update the emitter states.
*
* The data is initialised from XML files.
*
* Most of the emitter type data is represented as subclasses of IParticleVar,
* which will typically return a constant value or a random value each time it's
* evaluated. New subclasses can be added to support different random distributions,
* etc.
*/
class CParticleEmitterType
{
NONCOPYABLE(CParticleEmitterType); // reference member
public:
CParticleEmitterType(const VfsPath& path, CParticleManager& manager);
private:
friend class CModelParticleEmitter;
friend class CParticleEmitter;
friend class CParticleVarConstant;
friend class CParticleVarUniform;
friend class CParticleVarCopy;
friend class ParticleRenderer;
enum
{
VAR_EMISSIONRATE,
VAR_LIFETIME,
VAR_POSITION_X,
VAR_POSITION_Y,
VAR_POSITION_Z,
VAR_ANGLE,
VAR_VELOCITY_X,
VAR_VELOCITY_Y,
VAR_VELOCITY_Z,
VAR_VELOCITY_ANGLE,
VAR_SIZE,
VAR_SIZE_GROWTHRATE,
VAR_COLOR_R,
VAR_COLOR_G,
VAR_COLOR_B,
VAR__MAX
};
int GetVariableID(const std::string& name);
bool LoadXML(const VfsPath& path);
/**
* Update the state of an emitter's particles, by a potentially long time @p dt.
*/
void UpdateEmitter(CParticleEmitter& emitter, float dt);
/**
* Update the state of an emitter's particles, by a short time @p dt that can
* be computed in a single step.
*/
void UpdateEmitterStep(CParticleEmitter& emitter, float dt);
CBoundingBoxAligned CalculateBounds(CVector3D emitterPos, CBoundingBoxAligned emittedBounds);
CTexturePtr m_Texture;
GLenum m_BlendEquation;
GLenum m_BlendFuncSrc;
GLenum m_BlendFuncDst;
bool m_StartFull;
bool m_UseRelativeVelocity;
float m_MaxLifetime;
size_t m_MaxParticles;
CBoundingBoxAligned m_MaxBounds;
typedef shared_ptr<IParticleVar> IParticleVarPtr;
std::vector<IParticleVarPtr> m_Variables;
typedef shared_ptr<IParticleEffector> IParticleEffectorPtr;
std::vector<IParticleEffectorPtr> m_Effectors;
CParticleManager& m_Manager;
};
typedef shared_ptr<CParticleEmitterType> CParticleEmitterTypePtr;
#endif // INCLUDED_PARTICLEEMITTERTYPE
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