//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSGUTIL_STATISTICS
#define OSGUTIL_STATISTICS 1

#include <osg/Object>

namespace osg {

/**
 * Statistics base class. Used to extract primitive information from 
 * the renderBin(s).  Add a case of getStats(osgUtil::Statistics *stat)
 * for any new drawable (or drawable derived class) that you generate 
 * (eg see GeoSet.cpp).  There are 20 types of drawable counted - actually only
 * 14 cases can occur in reality.  these represent sets of GL_POINTS, GL_LINES
 * GL_LINESTRIPS, LOOPS, TRIANGLES, TRI-fans, tristrips, quads, quadstrips etc
 * The number of triangles rendered is inferred:
 * each triangle = 1 triangle (number of vertices/3)
 * each quad = 2 triangles (nverts/2)
 * each trifan or tristrip = (length-2) triangles and so on.
 */

class SG_EXPORT Statistics : public osg::Object
{
    public:
    
        Statistics() {
            numOpaque=0, nummat=0;
            nprims=0, nlights=0; nbins=0; nimpostor=0;
            reset();
        };

        ~Statistics() {}; // no dynamic allocations, so no need to free
        virtual osg::Object* clone() const { return new Statistics(); }
        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Statistics*>(obj)!=0L; }
        virtual const char* className() const { return "Statistics"; }

        enum statsType {
            STAT_NONE, // default
            STAT_FRAMERATE, STAT_GRAPHS,
            STAT_PRIMS, STAT_PRIMSPERVIEW, 
            STAT_DC,
            STAT_RESTART // hint to restart the stats
        };
        void reset() {
            for (int i=0; i<20; i++) primverts[i]=numprimtypes[i]=primlens[i]=primtypes[i]=0;
        }

public:
                
        int numOpaque, nummat, nbins;
        int nprims, nlights;
        int nimpostor; // number of impostors rendered
        int numprimtypes[20]; // histogram of number of each type of prim
        int primtypes[20]; // histogram of number of each type of prim
        int primlens[20]; // histogram of lengths of each type of prim
        int primverts[20]; // histogram of number of vertices to be transformed
        
    protected:
    
};

}

#endif