render_particles.h

/*
 * Copyright 1993-2010 NVIDIA Corporation.  All rights reserved.
 *
 * Please refer to the NVIDIA end user license agreement (EULA) associated
 * with this source code for terms and conditions that govern your use of
 * this software. Any use, reproduction, disclosure, or distribution of
 * this software and related documentation outside the terms of the EULA
 * is strictly prohibited.
 *
 */

#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__