//

// Author:    Jon Kennedy

// Copyright: 2002-2006  3Dlabs Inc. Ltd.  All rights reserved.

// License:   see 3Dlabs-license.txt

//

#ifndef BLOBBYCLOUD_H

#define BLOBBYCLOUD_H

#ifdef __cplusplus

#include "Vector.h"

#include "Surface.h"

#include <vector>

#include "os.h"

// structure used for qsort algorithm.

struct TBlobby {

    float distSqr;

    int   blob;

};

typedef std::vector<vec3> TPositions;

typedef std::vector<vec3> TVelocities;

typedef std::vector<TBlobby> TBlobbies;

// vertex shader based blobby cloud

class TBlobbyCloud {

  public:

    TBlobbyCloud(double startTime);

    void Draw(GLhandleARB program_object) const;

    void Update(double elapsedTime);

    void Reset();

    void Load(GLhandleARB program_object);

  private:

    static const int blobCount = 10;

    static const int maxNearestBlobs = 5;

    TPositions positions;

    TVelocities velocities;

    vec3 limit;                         // bounding cube the blobs bounce around within

    double previousTime;                   // used for animation

    mutable GLint count;             // number of blobs to test against

    mutable TPositions blobbyPos;

    mutable TBlobbies nearestBlobs;     // list of neighbouring blobby positions to pass to the current blob getting rendered

    float blobbyCutoff;                 // the radius squared distance used to help determine the nearest neighbours

};

#endif

#ifdef __cplusplus

extern "C" {

#endif

void* newCloud(GLhandleARB program_object, double time);

void updateDrawCloud(void* cloud, GLhandleARB program_object, double time);

void deleteCloud(void* cloud);

#ifdef __cplusplus

}

#endif

#endif