Init

shaders/circle.fs

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+#version 330
+
+in vec2  f_position;
+in vec4  f_color;
+in float f_thickness;
+
+
+out vec4 fragColor;
+
+void main(){
+	float radius = 1.0;
+
+	//distance to circle
+	vec2 w = f_position;
+	float dw = length(w);
+	float d  = abs(dw - radius);
+
+	fragColor = vec4(f_color.rgb, smoothstep(f_thickness, 0.0, d));
+}