Vlajky

 Kernel pro vlajky - mimo
__global__ void kernel_flag( uchar4 *obr, uchar4 *vystup, int sizex, int sizey )
{
    int y = blockDim.y * blockIdx.y + threadIdx.y;
    int x = blockDim.x * blockIdx.x + threadIdx.x;
    float uhel = 0.2;

    uchar4 bgr2 = { 255, 255, 255 }; // bila

    int sx = sizex / 2;
    int sy = sizey / 2;

    int dx = (double)(x - sx) * cos(uhel) - (double)(y - sy) * sin(uhel);
    int dy = (double)(x - sx) * sin(uhel) + (double)(y - sy) * cos(uhel);

    int nx = sx + dx;
    int ny = sy + dy;

    if(nx >= sizex || nx < 0){
        vystup[ y * sizex + x ] = bgr2;
    }else
    if(ny >= sizey || ny < 0){
        vystup[ y * sizex + x ] = bgr2;
    }else{
        vystup[ y * sizex + x] = obr[ (ny) * sizex + nx];
    }
}





/* Recka vlajka
   if ( blockIdx.y%2 == 0 )
   {
      bgr.y = bgr.z = 0;
   }
   if( x <= sizex/2 && y<= sizey/2 )
   {
      bgr.y = bgr.z = 0;
   }
   if( (x <= sizex/2) && (y<= sizey/2)  )
   {
      if(sizey/4 >= y-10  && sizey/4 <= y+10)
      {
         bgr.z = 255;       // R
         bgr.y = 255;    // G   Cervena
         bgr.x = 255;      // B
      }

      if ( x+10 >= sizex/4 && x-10 <= sizex/4 )
      {
         bgr.z = 255;       // R
         bgr.y = 255;    // G   Cervena
         bgr.x = 255;      // B
      }
   }

   */


      //Otocena vlajka

/*
      // Cervena barva
      if ( x >= sizex / 2 )
        {
        bgr.y = bgr.x = 0; // zustane cervena
        }


      // Modra barva
      if(y>=(sizey-sizex/2))
      {
        if(x <= (sizex - sizey + y ) && x >= ( sizey - y))

          {
      bgr.z = y;       // R
      bgr.y = y;    // G   Cervena
      bgr.x = 255;      // B
          }
      }

*/

/*

   // Kostecky v levo dole a v pravo nahore

   // Kostka v levo dole
   if  ( x < sizex/2 && y > sizey/2 )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }

   // Kostka v pravo nahore
   if ( x > sizex/2 && y < sizey/2 )
   {
      bgr.z = 204;   // R
      bgr.y = 153;   // G   Cervena
      bgr.x = 255;    // B
   }

   //Kostka v v pravo dole
   if ( x > sizex/2 && y > sizey/2 )
   {
      bgr.z = 255;   // R
      bgr.y = 0;       // G   Cervena
      bgr.x = 0;      // B
   }

   // Kontka v levo nahore
   if  ( x < sizex/2 && y < sizey/2 )
   {
      bgr.z = 0;       // R
      bgr.y = 102;    // G   Cervena
      bgr.x = 0;      // B
   }

*/


/*
   // Kriz - zachrany


   if ( (y > 2*(sizey/6)) && (y < 4*(sizey/6)) && (x > (sizex/6)) && (x < 5*(sizex/6))  )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }
   if ( (y > sizey/6) && (y < 5*(sizey/6)) && (x > 2*(sizex/6)) && (x < 4*(sizex/6))  )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }
*/

/*
   //Obdelnik |___|


   int hrana = sizex/8;

   if ( (y > 2*(sizey/6)) && (y < 4*(sizey/6)) && (x > (sizex/6)) && (x < 5*(sizex/6))  )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }
*/

/*
   //Obdelnik |_|


   int hrana = sizex/8;

   if ( (y > sizey/6) && (y < 5*(sizey/6)) && (x > 2*(sizex/6)) && (x < 4*(sizex/6))  )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }

*/
/*
// KRUH - dneska
int y = blockDim.y * blockIdx.y + threadIdx.y;
int x = blockDim.x * blockIdx.x + threadIdx.x;
int stred_x = 150;
int stred_y = 150;
int r = 140;
int dx = stred_x - x; // horizontal offset
int dy = stred_y - y; // vertical offset
if ( (dx*dx + dy*dy) <= (r*r) ){
bgr.y = 0;
bgr.z = 0;}
*/
/*
   //Ctverec

   int hrana = sizex/8;

   if ( (y > sizey/4) && (y< 3*(sizey/4)) && (x > sizex/4) && (x < 3*(sizex/4)) )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }
*/

/*
   //Prouzky vertikálně

   if ( blockIdx.x%2 == 0 )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }
*/


/*
   //Prouzky horizontalně

   if ( blockIdx.y%2 == 0 )
   {
      bgr.x = bgr.y = bgr.z = 0;
   }
*/

/*
   //Kruh

    float a = (sizex/2-x)*(sizex/2-x)+(sizey/2-y)*(sizey/2-y);

    if ( a <= 60*60)
    {
       bgr.x = bgr.y = bgr.z = 0;
    }

    if ( a <= 70*70)
    {
       bgr.x = bgr.y =0;
    }
*/

/*
   //Trojuhelnik dolu

   if ( (x+y) <= sizex+sizex/2 && (x+(sizex/2)>=y ) && y > sizey/2 )
   {
      bgr.y = bgr.z = 0;
   }
*/


/*
   //Trojuhelnik nahoru

   if (  (x+y>=sizex/2) &&  (x-(sizex/2)<=y ) && y < sizey/2 )
   {
      bgr.y = bgr.z = 0;
   }
*/

/*
   //Trojuhelnik do prava

   if (  (x-(sizex/2)<=y ) &&  (x+y) <= sizex+sizex/2 && x> sizex/2 )
   {
      bgr.y = bgr.z = 0;
   }
*/

/*
   //Trojuhelnik do leva

   if (  (x+y>=sizex/2)  && (x+(sizex/2)>=y ) && x <= sizex/2)
   {
      bgr.y = bgr.z = 0;
   }
*/

/*
   //Kosoctverec - prazdny

   if (  (x+y<=sizex/2)  || (x+(sizex/2)<=y ) || (x-(sizex/2)>=y ) ||  (x+y) >= sizex+sizex/2  )
   {
      bgr.y = bgr.z = 0;
   }
*/

/*
   //Kosoctverec Modry
   if (  (x+y>=sizex/2)  && (x+(sizex/2)>=y ) && (x-(sizex/2)<=y ) &&  (x+y) <= sizex+sizex/2  )
   {
      bgr.y = bgr.z = 0;
   }
*/

/********Sachovnice 8X8

   // Nastavení velikosti 8x8 ci 4x4 provedu pomocí main3.cpp
   if ( (blockIdx.y%2==1 && blockIdx.x%2==1) || (blockIdx.y%2==0 && blockIdx.x%2==0)   )
   {
      bgr.y = bgr.z = 0;
   }
*/


/**/

/*
for (int i = 1; i < sizey/2; i++) {

      if ((y < i*(sizey / 10)))
     {
      }
      else if ( y <= (i*(sizey / 10) + 5))
     {
         bgr.y = bgr.z = 0;
      }
   }
¨*/

/*
   // Uhlopricka
   if ( ((x+y) % 33 == 1)  )
   {
      bgr.y = bgr.z = 0;
   }
*/

/*
   // Uhlopricka
   if ( (x-10 <= y) && (x+10 >=y) )
   {
      bgr.y = bgr.z = 0;
   }
*/

/*

   //Obracena uhlopricka
   if ( x+y <= sizex+10 && x+y >= sizex -10)
   {
      bgr.y = bgr.z = 0;
   }

   //Prouzek pres pulku horizontalne
   if ( sizey/2 >= y-10  && sizey/2 <= y+10 )
   {
      bgr.y = bgr.z = 0;
   }

   //Prouzek pres pulku vertikalne
   if ( x+10 >= sizex/2 && x-10 <= sizex/2 )
   {
      bgr.y = bgr.z = 0;
   }
*/

/*
       // horni polovina
       if (y < sizey/2)
       {
          if((x>(sizex/2-y))&&(x<(sizex/2+y)))
          {
             bgr.y = bgr.z = 0;
          }
       }

       // dolni polovina
       if (y >= sizey/2)
       {
          if((x>(y%(sizey/2)))&&(x<(sizey-(y%(sizey/2)))))
          {
             bgr.y = bgr.x = 0;
          }
       }





*/


Pridavam vymrdanu vlajku britskych ostrovov...

KÓD: VYBRAT VŠE
uchar4 bgr = { 255, 0, 0 }; // modra


if ( x>=y*3/2-30 && x<=y*3/2+30 )
   {
      bgr.y = bgr.z = 255;
     if ( x>=y*3/2-10 && x<=y*3/2+10 )
      {
         bgr.x = bgr.y = 0;
      }


   }

 //--------
  if ( sizex - x>=y*3/2-30 &&   sizex - x<=y*3/2+30)
   {
       bgr.y = bgr.z = 255;
     if ( sizex - x>=y*3/2-10 &&   sizex - x<=y*3/2+10)
       {
      bgr.x = bgr.y = 0;
       }


   }


   if (x > sizex/3)
{
    if (x < sizex*2/3 )
      bgr.z= bgr.x = bgr.y = 255;

}
if (y > sizey/3)
{
    if (y < sizey*2/3 )
       bgr.z= bgr.x = bgr.y = 255;
}
//---------------
   if (x > sizex/3+50)
{
    if (x < sizex*2/3-50 )
     bgr.x = bgr.y = 0;

}
if (y > sizey/3+30)
{
    if (y < sizey*2/3-30 )
       bgr.x = bgr.y = 0;
}