AbstractParticleSystem.h

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#pragma once
 
#include "Vec3.h"
#include "Mat4.h"
 
#include "GLProgram.h"
#include "GLBuffer.h"
#include "GLArray.h"
#include "GLTexture2D.h"



const Vec3 RANDOM_COLOR{-1.0f,-1.0f,-1.0f};
const Vec3 RAINBOW_COLOR{-2.0f,-2.0f,-2.0f};

class AbstractParticleSystem {
public:
  AbstractParticleSystem(float pointSize, float refDepth=1.0f);
  virtual ~AbstractParticleSystem() {}

  virtual void update(float t) = 0;

  void setPointSize(float pointSize, float refDepth=1.0f) {
    this->pointSize = pointSize;
    this->refDepth = refDepth;
  }

  float getPointSize() const {return pointSize;}
  float getRefDepth() const {return refDepth;}

  virtual void setColor(const Vec3& color) = 0;

  void render(const Mat4& v, const Mat4& p);


  virtual std::vector<float> getData() const = 0;
  virtual size_t getParticleCount() const = 0;

  static Vec3 computeColor(const Vec3& c);
 
private:
  float pointSize;   
  float refDepth;    
 
  // --- GL resources (created/owned by the renderer) ---
  GLProgram  prog;        
  GLint      mvpLocation; 
  GLint      ppLocation;  
  GLint      texLocation; 
  GLTexture2D sprite;     
 
  GLArray particleArray;  
  GLBuffer vbPosColor;    
};