struct SParticle {   float    life; // the lifespan of a particle (in time)   float[3] pos; // the position   float[3] velocity; // the velocity   float    mass; // the mass of a particle - for physics   float    size; // the size of the particle on the screen   float[3] color; // the color of the particle   float    translucency; // the translucency of the particle (how clear it is).  is useful for making it disappear bit by bit over time   float    friction; // the friction the particle creates};

class CParticle_Engine{  private:    SParticle* m_particles; // the list of active particles    int        m_numparticles; // how many particles we have    float[3]   m_gravity; // the gravity (or force) applied to the particles (as a whole)    float      life; // the default lifespan    float[3]   color; // the default color    float      friction; // the default force applied    /*     * creates a particle and adds it to the list, based upon the           * default criteria set above     */    void CreateParticle(float velX, float velY, float velZ);  public:    CParticle_Engine() {}    ~CParticle_Engine() {}    /*     * updates all the particles.  those whose lifespans      */    void Update()    {        float[3] momentum;        for(int i = 0; i < m_numparticles; i++)        {            // age the particles            m_particles.life -= 1;            // only update the particle if it is alive            if(m_particle.life > 0.0f /* || particlepos > somevalue ect.. */)            {                // update the particle                // mostly physics calculation                // update velocity, momentum, transluceny, ect.                // left for you to do            }            else            {                // remove the particle from the list            }        }    }    void DrawParticles()    {        for(int i = 0; i < m_numparticles; i++)        {             // use opengl here             glBegin(GL_QUADS)                // set color                // set texture                // set alpha blending (if any)                // set the texture coords (if a texture is                       // loaded)                // do some billboard calculations to ensure                // we don't just see air                glVertex3f(// top left of particle);                glVertex3f(// top right of particle);                glVertex3f(// bottom right of particle);                glVertex3f(// bottom left of particle);             glEnd();        }    }};