source: trunk/vizservers/nanovis/NvParticleRenderer.h @ 823

/*
 * ----------------------------------------------------------------------
 * NvParticleRenderer.h: particle system class
 *
 * ======================================================================
 *  AUTHOR:  Wei Qiao <qiaow@purdue.edu>
 *           Purdue Rendering and Perceptualization Lab (PURPL)
 *
 *  Copyright (c) 2004-2006  Purdue Research Foundation
 *
 *  See the file "license.terms" for information on usage and
 *  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 * ======================================================================
 */


#ifndef _PARTICLE_SYSTEM_H_
#define _PARTICLE_SYSTEM_H_

#include "GL/glew.h"
#include "Cg/cgGL.h"

#include "define.h"
#include "config.h"
#include "global.h"

#include "Renderable.h"
#include "RenderVertexArray.h"
#include "Vector3.h"

#include "NvParticleAdvectionShader.h"

typedef struct Particle {
  float x;
  float y;
  float z;
  float aux;

  Particle(){};
  Particle(float _x, float _y, float _z, float _life) :
   x(_x), y(_y), z(_z), aux(_life){}
};


class NvParticleRenderer : public Renderable {
    /**
     * @brief frame buffer objects: two are defined, flip them as input output every step
     */
    NVISid psys_fbo[2];         

    /**
     * @brief color textures attached to frame buffer objects
     */
    NVISid psys_tex[2]; 

    Particle* data;

    /**
     *@brief Count the frame number of particle system iteration
     */
    int psys_frame;         
    
    /**
     * @brief Reinitiate particles      
     */
    bool reborn;                        

    /**
     * @brief flip the source and destination render targets 
     */
    bool flip;                  

    float max_life;

    /**
     * @brief vertex array for display particles
     */
    RenderVertexArray* m_vertex_array;  

  //Nvidia CG shaders and their parameters
  /*
  CGcontext m_g_context;
  CGprogram m_pos_fprog;
  CGparameter m_vel_tex_param, m_pos_tex_param, m_scale_param;
  CGparameter m_pos_timestep_param, m_pos_spherePos_param;
  */
    NvParticleAdvectionShader* _advectionShader;

    /**
     * @brief scale of flow data 
     */
    Vector3 scale;

public:
    int psys_width;     //the storage of particles is implemented as a 2D array.
    int psys_height;

    NvParticleRenderer(int w, int h, CGcontext context, NVISid vector_field, 
                  float scalex, float scaley, float scalez);
    ~NvParticleRenderer();
    void initialize(Particle* data);
    void advect();
    void update_vertex_buffer();
    void display_vertices();
    void reset();
    void render();
};


#endif