Implement multiple radial distortion rendering

shader/texture/barrel.frag

@@ -6,10 +6,7 @@ in vec2 vcpos;
 out vec4 fColor;
 layout (binding = 1) uniform sampler2D screenTexture;
 float f ( float x) {
- //return max (1, 1 / (2 * x + 0.5)) ;
- //return min (1, x) ;
  if (x>1) {return 1;} else {return (1-gfactor)*x + gfactor;}
- //if (x>1) {return 1;} else {return 0.5;}
 }
 void main()
 {
@@ -18,8 +15,4 @@ void main()
                 , 0.5+0.5 *( vcpos + t * (texPos - vcpos))
                 ) 
                 );
-    //vec4 tColor = vec4(texture(screenTexture , cpos + (texPos - cpos)) );
-    //float t = distance(cenPos,texPos);
-    //fColor = vec4(tColor.xy,t,tColor.w);
-    //fColor = tColor;
 }