struct appin : application2vertex
{
  float packed threemer[3];
  float packed target[3];
};

struct vertout : vertex2fragment
{
  float packed threemer[3];
  float score;
};

vertout main(appin IN, uniform float blosum[191])
{

  vertout OUT;
  float s;
  float pos;

  s = 0;

  pos = 191 - ((20 - IN.threemer[0]) * (21 - IN.threemer[0]))/2 + IN.target[0] - IN.threemer[0]; 
  s = s + blosum[pos];

  pos = 191 - ((20 - IN.threemer[1]) * (21 - IN.threemer[1]))/2 + IN.target[1] - IN.threemer[1]; 
  s = s + blosum[pos];

  pos = 191 - ((20 - IN.threemer[2]) * (21 - IN.threemer[2]))/2 + IN.target[2] - IN.threemer[2]; 
  s = s + blosum[pos];
	
  OUT.threemer[0] = IN.threemer[0];
  OUT.threemer[1] = IN.threemer[1];
  OUT.threemer[2] = IN.threemer[2];

  OUT.score = s;

  return OUT;
}