246 lines
5.7 KiB
C++
246 lines
5.7 KiB
C++
// particlesystem.h
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//
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// Copyright (C) 2008, Chris Laurel <claurel@gmail.com>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#ifndef _CELENGINE_PARTICLESYSTEM_H_
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#define _CELENGINE_PARTICLESYSTEM_H_
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#include "celmodel/model.h"
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#include "celmodel/mesh.h"
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#include "celutil/color.h"
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#include "rendcontext.h"
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#include "geometry.h"
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#include <Eigen/Core>
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#include <string>
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#include <list>
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class VectorGenerator;
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struct ParticleVertex
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{
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void set(const Eigen::Vector3f& _position, const Eigen::Vector2f& _texCoord, const unsigned char* _color)
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{
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position = _position;
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texCoord = _texCoord;
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color[Color::Red] = _color[Color::Red];
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color[Color::Green] = _color[Color::Green];
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color[Color::Blue] = _color[Color::Blue];
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color[Color::Alpha] = _color[Color::Alpha];
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}
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Eigen::Vector3f position;
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Eigen::Vector2f texCoord;
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unsigned char color[4];
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};
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class ParticleEmitter
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{
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public:
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ParticleEmitter();
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~ParticleEmitter();
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void render(double tsec, RenderContext& rc, ParticleVertex* particleBuffer, unsigned int particleBufferCapacity) const;
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void setAcceleration(const Eigen::Vector3f& acceleration);
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void createMaterial();
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void setLifespan(double startTime, double endTime);
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void setRotationRateRange(float minRate, float maxRate);
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void setBlendMode(cmod::Material::BlendMode blendMode);
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private:
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double m_startTime;
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double m_endTime;
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public:
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ResourceHandle m_texture;
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float m_rate;
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float m_lifetime;
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Color m_startColor;
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float m_startSize;
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Color m_endColor;
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float m_endSize;
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VectorGenerator* m_positionGenerator;
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VectorGenerator* m_velocityGenerator;
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private:
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Eigen::Vector3f m_acceleration;
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bool m_nonZeroAcceleration;
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float m_minRotationRate;
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float m_rotationRateVariance;
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bool m_rotationEnabled;
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cmod::Material::BlendMode m_blendMode;
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cmod::Material m_material;
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};
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class ParticleSystem : public Geometry
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{
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public:
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ParticleSystem();
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virtual ~ParticleSystem();
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virtual void render(RenderContext& rc, double tsec = 0.0);
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virtual bool pick(const Eigen::ParametrizedLine<double, 3>& r, double& distance) const;
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virtual bool isOpaque() const;
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void addEmitter(ParticleEmitter* emitter);
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public:
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std::list<ParticleEmitter*> m_emitterList;
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cmod::Mesh::VertexDescription* m_vertexDesc;
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ParticleVertex* m_vertexData;
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unsigned int m_particleCapacity;
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unsigned int m_particleCount;
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};
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class LCGRandomGenerator;
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/*! Generator abstract base class.
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* Subclasses must implement generate() method.
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*/
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class VectorGenerator
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{
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public:
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VectorGenerator() = default;
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virtual ~VectorGenerator() = default;
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virtual Eigen::Vector3f generate(LCGRandomGenerator& gen) const = 0;
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};
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/*! Simplest generator; produces the exact same value on each call
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* to generate().
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*/
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class ConstantGenerator : public VectorGenerator
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{
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public:
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ConstantGenerator(const Eigen::Vector3f& value) : m_value(value) {}
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virtual Eigen::Vector3f generate(LCGRandomGenerator& gen) const;
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private:
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Eigen::Vector3f m_value;
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};
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/*! Generates values uniformly distributed within an axis-aligned box.
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*/
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class BoxGenerator : public VectorGenerator
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{
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public:
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BoxGenerator(const Eigen::Vector3f& center, const Eigen::Vector3f& axes) :
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m_center(center),
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m_semiAxes(axes * 0.5f)
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{
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}
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virtual Eigen::Vector3f generate(LCGRandomGenerator& gen) const;
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private:
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Eigen::Vector3f m_center;
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Eigen::Vector3f m_semiAxes;
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};
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/*! Generates values uniformly distributed on a line between
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* two points.
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*/
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class LineGenerator : public VectorGenerator
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{
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public:
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LineGenerator(const Eigen::Vector3f& p0, const Eigen::Vector3f& p1) :
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m_origin(p0),
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m_direction(p1 - p0)
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{
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}
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virtual Eigen::Vector3f generate(LCGRandomGenerator& gen) const;
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private:
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Eigen::Vector3f m_origin;
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Eigen::Vector3f m_direction;
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};
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/*! Generates values uniformly distributed on the surface
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* of an ellipsoid.
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*/
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class EllipsoidSurfaceGenerator : public VectorGenerator
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{
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public:
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EllipsoidSurfaceGenerator(const Eigen::Vector3f& center, const Eigen::Vector3f& semiAxes) :
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m_center(center),
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m_semiAxes(semiAxes)
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{
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}
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virtual Eigen::Vector3f generate(LCGRandomGenerator& gen) const;
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private:
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Eigen::Vector3f m_center;
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Eigen::Vector3f m_semiAxes;
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};
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/*! Generates values uniformly distributed within a spherical
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* section. The section is centered on the z-axis.
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*/
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class ConeGenerator : public VectorGenerator
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{
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public:
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ConeGenerator(float minAngle, float maxAngle, float minLength, const float maxLength) :
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m_cosMinAngle(1.0f - std::cos(minAngle)),
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m_cosAngleVariance(std::cos(minAngle) - std::cos(maxAngle)),
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m_minLength(minLength),
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m_lengthVariance(maxLength - minLength)
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{
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}
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virtual Eigen::Vector3f generate(LCGRandomGenerator& gen) const;
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private:
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float m_cosMinAngle;
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float m_cosAngleVariance;
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float m_minLength;
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float m_lengthVariance;
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};
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/*! Generates points in a 2D gaussian distribution in
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* the xy-plane and centered on the origin.
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*/
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class GaussianDiscGenerator : public VectorGenerator
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{
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public:
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GaussianDiscGenerator(float sigma) :
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m_sigma(sigma)
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{
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}
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virtual Eigen::Vector3f generate(LCGRandomGenerator& gen) const;
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private:
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float m_sigma;
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};
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//ParticleSystem* LoadParticleSystem(const std::string& filename, const std::string& resourcePath);
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#endif // _CELENGINE_PARTICLESYSTEM_H_
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