#version 430 core
in vec2 cenPosT;
in vec2 gParams;
out vec4 fColor;

void main()
{
  vec2 pos = gl_FragCoord.xy;
  float dist = min(1 , 2*distance(pos,cenPosT) / (gParams.x));
  float c = gParams.y * pow(1-dist,2);
  fColor = vec4(c,c,c,c);
}