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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#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__
