source: orxonox.OLD/orxonox/branches/dave/src/shadow.cc @ 3675

/*

    orxonox - the future of 3D-vertical scrollers
    
    Copyright (C) 2004 orx
    
    This program is free software; you can redistribute it and/or modify it 
    under the terms of the GNU General Public License as published by the Free 
    Software Foundation; either version 2, or (at your option) any later version.
    
    ### File Specific:
    main-programmer: David Gruetter
    co-programmer: ...
    
    
    Created by Dave, in this file shadow will be implemented in a quite sexy and
    fast way, with a lot of opengl-code, to keep it fast! The origin of the code
    comes form an example at www.frustum.org, slitly different although, so that 
    it works with Orxonox:)
    
    */
    
#include "importer/material.h"
#include "stdincl.h"
#include <stdio.h>
#include <stdarg.h>
#include <malloc.h>
#include <math.h>
#include "shadow.h"

#define SIZE    128
#define GL_CLAMP_TO_EDGE_EXT 0x812F

using namespace std;

/**
   \brief default Constructor
*/

Shadow::Shadow()
{
}


/**
    \brief default destructor
*/

Shadow::~Shadow()
{
}


/**
    \don't ask me how this works, but it adds a blur effect to the shadow
    \for it doesn't look that edgy
    
*/
void Shadow::blur(unsigned char *in,int size)
{
    int x,y,sum,size3=size*3;
    unsigned char *out,*inp,*outp;
    out = (unsigned char *)malloc(size * size * 3);
    memset(out,255,size *size *3);
    
    inp=in+size3;
    outp=out+size3;
    for(y=1;y<size-1;y++){
        inp+=3;
        outp+=3;
        for(x=1;x<size-1;x++){
            sum=inp[-size3-3]+ inp[-size3] + inp[-size3+3]+
            inp[-3]+inp[0]+inp[3]+
            inp[size3-3]+inp[size3]+inp[size3+3];
            sum/=9;
            inp+=3;
            *outp++ =sum;
            *outp++ =sum;
            *outp++ =sum;
        }
        inp+=3;
        outp+=3;
    }
    
    memcpy(in,out,size*size*3);
    free(out);
        
            
    


}