Tone down pixel upscaling, removes artifacts

shader/texture/antia.frag

@@ -8,7 +8,7 @@ vec3 f (float x, float y)
 { return texture(screenTexture, vTexPos + vec2(x/screensize.x,y/screensize.y)).xyz; 
 }
 bool t (vec3 x, vec3 y)
-{ return dot(x-y,x-y) < 0.1;
+{ return dot(x-y,x-y) < 0.005;
 }
 bool t3 (vec3 x, vec3 y, vec3 z)
 { return t(x,y) && t(y,z);
@@ -23,13 +23,13 @@ vec3 br = f( 1,-1);
 vec3 bb = f( 0,-2);
 vec3 bl = f(-1,-1);
 vec3 ml = f(-2, 0);
-    if (t3(tt,tr,mr))
+    if (t3(tl,tr,br))
         { fColor = vec4(tr,1);}
-    else if (t3(mr,br,bb))
+    else if (t3(tr,br,bl))
         { fColor = vec4(br,1);}
-    else if (t3(bb,bl,ml))
+    else if (t3(br,bl,tl))
         { fColor = vec4(bl,1);}
-    else if (t3(ml,tl,tt))
+    else if (t3(bl,tl,tr))
         { fColor = vec4(tl,1);}
     else 
         //{fColor = texture(screenTexture, vTexPos); }