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class OctaMapSamp{
public:
int TotTexSizeX(){
return size;
}
int TotTexSizeY(){
return size;
}
static vector<int> map; // mappa 2d di indici a dir
static vector<Point3f> dir; // direzioni (uniche!)
static vector<Point3f> dirrot; // direzioni ruotate (uniche!)
vector<float> sum; // somme (uniche!)
vector<float> div; // divisioni (uniche!)
static int size;
void Shade(){
//col.resize(dir.size());
/*for (int i=0; i<dir.size(); i++) {
col[i]=dir[i]*Point3d(0.6,0.8,0);
if (col[i]<0) col[i]*=-1;
if (col[i]>1) col[i]=1;
}*/
}
static inline int nsamp(){
return dir.size();
}
// duplicates those texels that are already douplicated
void DuplicateTexels(vector<Byte> &t, int s, int tx, int ty){
int e=size-1; // the end
// four corners
int k0=(tx+ (ty )*s)*3;
int k1=(tx+e+(ty )*s)*3;
int k2=(tx+e+(ty+e)*s)*3;
int k3=(tx+ (ty+e)*s)*3;
t[k0 ]=t[k1 ]=t[k2 ]=t[k3 ];
t[k0+1]=t[k1+1]=t[k2+1]=t[k3+1];
t[k0+2]=t[k1+2]=t[k2+2]=t[k3+2];
// sides
for (int i=1; i<size/2; i++) {
int k0a=(tx + (ty +i )*s)*3;
int k0b=(tx + (ty +e-i)*s)*3;
int k1a=(tx+e + (ty +i )*s)*3;
int k1b=(tx+e + (ty +e-i)*s)*3;
int k2a=(tx+i + (ty )*s)*3;
int k2b=(tx+e-i+ (ty )*s)*3;
int k3a=(tx+i + (ty +e )*s)*3;
int k3b=(tx+e-i+ (ty +e )*s)*3;
t[k0a+0]=t[k0b+0]; t[k1a+0]=t[k1b+0]; t[k2a+0]=t[k2b+0]; t[k3a+0]=t[k3b+0];
t[k0a+1]=t[k0b+1]; t[k1a+1]=t[k1b+1]; t[k2a+1]=t[k2b+1]; t[k3a+1]=t[k3b+1];
t[k0a+2]=t[k0b+2]; t[k1a+2]=t[k1b+2]; t[k2a+2]=t[k2b+2]; t[k3a+2]=t[k3b+2];
}
}
void FillTexture(vector<Byte> &t, int s, int tx, int ty,
float cr,float cg,float cb){
for (int y=0; y<size; y++) {
for (int x=0; x<size; x++)
{
int k=(x+tx+(y+ty)*s)*3;
//Byte shade=(int)( col[ Index( x , y ) ] );
/*t[k++]= shade;
t[k++]= shade;
t[k++]= shade;*/
Point3f p=dir[ Index( x , y ) ];
Point3f q=(p+Point3f(1,1,1))/2.0*255.0;
t[k++]= (Byte)q[0];
t[k++]= (Byte)q[1];
t[k++]= (Byte)q[2];
/*int shade=(int)(p*Point3d(0.8,0.6,0)*255.0);
if (shade<0) shade=-shade/2;
if (shade>255) shade=255;
t[k++]= shade;
t[k++]= shade;
t[k++]= shade;*/
/* float i=255.0*float(map[Index( x , y )])/(size*size*size);
t[k++]= (int)i;
t[k++]= (int)i;
t[k++]= (int)i;
int r=0, g=0, b=0;
if (y<size) r=255;
if (x<size) b=255; if (x>=size*2) g=255;
k=(x+(y)*s)*3;
t[k++]= t[k++]/2+r/2;
t[k++]= t[k++]/2+g/2;
t[k++]= t[k++]/2+b/2;
*/
/*
int r=0, g=0, b=0;
if (y<size) r=255;
if (x<size) b=255; if (x>=size*2) g=255;
t[k++]= r;
t[k++]= g;
t[k++]= b;*/
// printf("%4d ",map[Index( x , y )]);
//printf("%3d ",shade);
}
//printf("\n");
}
}
inline static int Index(int x, int y){
return x+y*size;
}
inline static float sign(float x){
return (x<0)?-1:+1;
}
inline static float Abs(float x){
return (x<0)?-x:+x;
}
void Zero(){
int n=dir.size();
sum.resize(n,0);
div.resize(n,0);
}
// smoothing of an octamap!
void Smooth(vector<Byte> &t, int s, int tx, int ty){
vector<int> oldvalue(size*size*6);
// copy old values
for (int y=0; y<size*2; y++)
for (int x=0; x<size*3; x++)
{
int k=(x+tx+(y+ty)*s)*3;
int i= Index( x , y );
oldvalue[i]=t[k];
}
int dy=size, dx=1;
int e=size-1;
// smooth old values
for (int y=0; y<size; y++)
for (int x=0; x<size; x++)
{
/* int i= Index( x , y );
int sum=oldvalue[i];
if (y!=0) sum+=oldvalue[i-dy];
else sum+=oldvalue[ Index( e-x , 1 ) ];
if (x!=0) sum+=oldvalue[i-dx];
else sum+=oldvalue[ Index( 1 , e-y ) ];
if (y!=e) sum+=oldvalue[i+dy];
else sum+=oldvalue[ Index( e-x ,e-1 ) ];
if (x!=e) sum+=oldvalue[i+dx];
else sum+=oldvalue[ Index( e-1 , e-y ) ];
sum=(sum+3)/5;
*/
int i= Index( x , y );
const int TH=2;
int sum=oldvalue[i];
int ddiv=1;
int w;
if (y!=0) w=oldvalue[i-dy];
else w=oldvalue[ Index( e-x , 1 ) ];
if(w>TH) {sum+=w; ddiv++; }
if (x!=0) w=oldvalue[i-dx];
else w=oldvalue[ Index( 1 , e-y ) ];
if(w>TH) {sum+=w; ddiv++; }
if (y!=e) w=oldvalue[i+dy];
else w=oldvalue[ Index( e-x ,e-1 ) ];
if(w>TH) {sum+=w; ddiv++; }
if (x!=e) w=oldvalue[i+dx];
else w=oldvalue[ Index( e-1 , e-y ) ];
if(w>TH) {sum+=w; ddiv++; }
sum=(sum+ddiv/2)/ddiv;
int k=(x+tx+(y+ty)*s)*3;
t[k]=t[k+1]=t[k+2]=sum;
}
}
// smoothing of an octamap!
void Smooth(vector<int> &t, int s, int tx, int ty){
vector<int> oldvalue(size*size*6);
// copy old values
for (int y=0; y<size*2; y++)
for (int x=0; x<size*3; x++)
{
int k=(x+tx+(y+ty)*s);
int i= Index( x , y );
oldvalue[i]=t[k];
}
int dy=size, dx=1;
int e=size-1;
// smooth old values
for (int y=0; y<size; y++)
for (int x=0; x<size; x++)
{
int i= Index( x , y );
const int TH=5;
int sum=oldvalue[i];
int ddiv=1;
int w;
if (y!=0) w=oldvalue[i-dy];
else w=oldvalue[ Index( e-x , 1 ) ];
if(w>TH) {sum+=w; ddiv++; }
if (x!=0) w=oldvalue[i-dx];
else w=oldvalue[ Index( 1 , e-y ) ];
if(w>TH) {sum+=w; ddiv++; }
if (y!=e) w=oldvalue[i+dy];
else w=oldvalue[ Index( e-x ,e-1 ) ];
if(w>TH) {sum+=w; ddiv++; }
if (x!=e) w=oldvalue[i+dx];
else w=oldvalue[ Index( e-1 , e-y ) ];
if(w>TH) {sum+=w; ddiv++; }
sum=(sum+ddiv/2)/ddiv;
int k=(x+tx+(y+ty)*s);
t[k]=sum;
}
}
static void SetSize(int _size){
size=_size;
initMap();
ComputeWeight();
}
static Point3f getDir(float x, float y){
float fs=float(size)-1;
Point3f p(x*2/fs-1,y*2/fs-1,0);
float ax=Abs(p[0]), ay=Abs(p[1]), az=+1;
if (ax+ay>1.0) {
p=Point3f( sign(p[0])*(1-ay),
sign(p[1])*(1-ax), 0);
az=-1;
}
p[2]=(1-ax-ay)*az;
p.Normalize();
return p;
}
static void initMap(){
dir.resize(size*size);
for (int y=0; y<size; y++)
for (int x=0; x<size; x++)
dir[Index(x,y)]=getDir(x,y);
}
static vector<float> weight;
static float Area(Point3f a, Point3f b, Point3f c){
return Abs( ((b-a)^(c-a)).Norm()*0.5 );
}
static void ComputeWeight(){
weight.resize(size*size);
for (int y=0,k=0; y<size; y++)
for (int x=0; x<size; x++,k++){
float h=0.5;
Point3f p00=getDir(x-h,y-h);
Point3f p01=getDir(x-h,y+0);
Point3f p02=getDir(x-h,y+h);
Point3f p10=getDir(x+0,y-h);
Point3f p11=getDir(x+0,y+0);
Point3f p12=getDir(x+0,y+h);
Point3f p20=getDir(x+h,y-h);
Point3f p21=getDir(x+h,y+0);
Point3f p22=getDir(x+h,y+h);
float tota=0; int c=0; int e=size-1;
if ( (x!=0) && (y!=0) ){
tota+=Area( p00, p10, p01 );
tota+=Area( p10, p11, p01 );
c++;
}
if ( (x!=0) && (y!=e) ){
tota+=Area( p01, p11, p12 );
tota+=Area( p01, p12, p02 );
c++;
}
if ( (x!=e) && (y!=0) ){
tota+=Area( p10, p20, p21 );
tota+=Area( p21, p11, p10 );
c++;
}
if ( (x!=e) && (y!=e) ){
tota+=Area( p11, p21, p12 );
tota+=Area( p21, p22, p12 );
c++;
}
weight[k]=1.0/(tota*4/c);
//printf("%8.6f%c",weight[k], (x%size==size-1)?'\n':' ' );
}
}
void FillTexture(vector<Byte> &texture, const vector<int> &sumtable,
int texsize, float div, int tx, int ty );
OctaMapSamp(){ }
};
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