Implement arc rendering, works for increasing angle difference < 2pi

shader/circle.frag

@@ -5,15 +5,14 @@ in float gRad;
 out vec4 fColor;
 out float gl_FragDepth;
 
-uniform vec2 winSize;
-
 void main()
 {
   vec2 pos = gl_FragCoord.xy;
  // fColor = vec4( gColor.xyz , 0 );
  // fColor = vec4( gColor.xyz , 1 - step(distance(pos,cenPos.xy),gRad) );
  // fColor = vec4( gColor.xyz , distance(pos,cenPos.xy)/gRad );
-  fColor = vec4( gColor.rgb, gColor.a * (1-step(gRad/2,distance(pos,cenPosT))) );
+//  fColor = vec4( gColor.rgb, gColor.a * (1-step(gRad/2,distance(pos,cenPosT))) );
   gl_FragDepth = max(gl_FragCoord.z , step(gRad/2,distance(pos,cenPosT)));
-  //fColor = vec4( 0.5,0,0 , 1 );
+  fColor = gColor;
 }
+//note it is the fragdepth that stops this from being square