fixes #812

effects/shaders/vignette.frag

@@ -1,5 +1,7 @@
 uniform float lensRadiusX;
 uniform float lensRadiusY;
+uniform float centerX;
+uniform float centerY;
 uniform bool circular;
 uniform vec2 resolution;
 // uniform vec2 lensRadius; // 0.45, 0.38
@@ -14,7 +16,7 @@ vec4 process(vec4 c) {
 		vignetteCoord.x *= ar;
 		vignetteCoord.x -= (1.0-(1.0/ar));
 	}
-	float dist = distance(vignetteCoord, vec2(0.5,0.5));
+	float dist = distance(vignetteCoord, vec2(0.5 + centerX*0.01, 0.5 + centerY*0.01));
 	float size = (lensRadiusX*0.01);
 	return vec4(c.rgb * smoothstep(size, size*0.99*(1.0-lensRadiusY*0.01), dist), c.a);
 }

effects/shaders/vignette.xml

@@ -9,5 +9,9 @@
 	<row name="Circular">
 		<field type="bool" default="false" id="circular"/>
 	</row>
+	<row name="Center">
+		<field type="double" default="0" id="centerX"/>
+		<field type="double" default="0" id="centerY"/>
+	</row>
 	<shader vert="common.vert" frag="vignette.frag"/>
 </effect>