particleSystemCPU.hpp

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#ifndef PARTICLESYSTEMCPU_HPP
#define PARTICLESYSTEMCPU_HPP

#include "sceneObject.hpp"


class ParticleSystemCPU : public SceneObject {

    struct ParticleGPU { //keep it POD
        float xyz[3];
        float alpha; // 0-dead, 1-newly created
    };

    struct ParticleCPU : public ParticleGPU {
        float cameraDistance;

        ParticleCPU();

        bool operator>(const ParticleCPU& other) const {
            return cameraDistance > other.cameraDistance;
        }
    };

public:
    ParticleSystemCPU(size_t particleCount, const std::string& name, Scene* scene = 0, Model* model = 0, const glm::mat4& modelMatrix = glm::mat4(1.0f));
    virtual ~ParticleSystemCPU();

    void push(const glm::vec3& pos);

    void draw() const;
    bool animate(double time);
    void update(double deltaT);
    void setShader(Shader* val);

private:
    double lastAnimate;
    GLuint particlesVBO;
    int activeParticleCount;
    std::vector<ParticleCPU> particlesNew;
    std::vector<ParticleCPU> particlesCPU;
    std::vector<ParticleGPU> particlesGPU;
};

#endif //PARTICLESYSTEMCPU_HPP