render_particles.h

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#ifndef __RENDER_PARTICLES__
#define __RENDER_PARTICLES__

class ParticleRenderer {
 public:
  ParticleRenderer();
  ~ParticleRenderer();

  void setPositions(float *pos, int numParticles);
  void setVertexBuffer(unsigned int vbo, int numParticles);
  void setColorBuffer(unsigned int vbo) { m_colorVBO = vbo; }

  enum DisplayMode { PARTICLE_POINTS, PARTICLE_SPHERES, PARTICLE_NUM_MODES };

  void display(DisplayMode mode = PARTICLE_POINTS);
  void displayGrid();

  void setPointSize(float size) { m_pointSize = size; }
  void setParticleRadius(float r) { m_particleRadius = r; }
  void setFOV(float fov) { m_fov = fov; }
  void setWindowSize(int w, int h) {
    m_window_w = w;
    m_window_h = h;
  }

 protected:  // methods
  void _initGL();
  void _drawPoints();
  GLuint _compileProgram(const char *vsource, const char *fsource);

 protected:  // data
  float *m_pos;
  int m_numParticles;

  float m_pointSize;
  float m_particleRadius;
  float m_fov;
  int m_window_w, m_window_h;

  GLuint m_program;

  GLuint m_vbo;
  GLuint m_colorVBO;
};

#endif  //__ RENDER_PARTICLES__