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/*************************************************** 
 * Developer: Clinton Jon Selke                    * 
 *   Version: Totally FreeWare (Do what you will)  * 
 *   Section: Particle Interface                   * 
 ***************************************************/ 
 
#ifndef _PARTICLE_H_ 
#define _PARTICLE_H_ 
 
#include  
#include  
#include "vector3.h" 
 
struct Particle; // A single particle for the particle system 
 
class ParticleSystem { 
    public: 
        ParticleSystem( 
            const Vector3& position,    // Particle System's Position 
            const Vector3& velocity,    // Particle System's Velocity 
            float min_dying_age,        // Minimum particle dying age 
            float max_dying_age,        // Maximum particle dying age 
            float start_size,           // Starting size of particle 
            float end_size,             // Finishing size of particle 
            float start_alpha,          // Starting transparency of particle 
            float end_alpha,            // Finishing transparency of particle 
            float min_speed,            // Minimum particle starting speed 
            float max_speed,            // Maximum particle starting speed 
            float create_delay,         // The time lapsed until the next particle is created 
            const Vector3& start_colour,// Starting colour of particle 
            const Vector3& end_colour,  // Finishing colour of particle 
            const Vector3& gravity,     // Gravity vector 
            unsigned int max_particles);// Maximum number of particles 
 
        ~ParticleSystem();          // Frees up resources 
         
        static void loadTexture();  // Loads in OpenGL Texture 
         
        void calculate(float dt);   // Calculates next display 
        void draw();                // Draws all particles using OpenGL 
    private: 
        // Particle constants 
        const float   MIN_DYING_AGE, 
                      MAX_DYING_AGE, 
                      START_SIZE, 
                      END_SIZE, 
                      START_ALPHA, 
                      END_ALPHA, 
                      MIN_SPEED, 
                      MAX_SPEED, 
                      CREATE_DELAY; 
        const Vector3 START_COLOUR, 
                      END_COLOUR, 
                      GRAVITY; 
        const unsigned int MAX_PARTICLES; 
                       
        // Particle storage 
        unsigned int  _number_of_particles; // The number of particles 
        Particle    **_particle_array;    // An array of pointers to particles 
 
        // Particle Systems Stats 
        Vector3       _position; // Particle systems position 
        Vector3       _velocity; // Particle systems velocity 
        float         _creation_timer; // Time until particle is created 
         
        // Particle Texture 
        static GLuint _particle_texture;    // stores particle OpenGL texture 
}; 
 
#endif /*_PARTICLE_H_*/