From 35e0cb4f1b91a4c61836dd2f098c04b391a55b41 Mon Sep 17 00:00:00 2001
From: itsmattkc <itsmattkc@gmail.com>
Date: Thu, 18 Apr 2019 02:57:21 +1000
Subject: [PATCH] fixes #812

---
 effects/shaders/vignette.frag | 4 +++-
 effects/shaders/vignette.xml  | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/effects/shaders/vignette.frag b/effects/shaders/vignette.frag
index df200f234..cf8014b25 100644
--- a/effects/shaders/vignette.frag
+++ b/effects/shaders/vignette.frag
@@ -3,6 +3,8 @@
 uniform sampler2D sceneTex; // 0
 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
@@ -20,7 +22,7 @@ void main(void) {
 		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);
 	c *= smoothstep(size, size*0.99*(1.0-lensRadiusY*0.01), dist);
 	gl_FragColor = c;
diff --git a/effects/shaders/vignette.xml b/effects/shaders/vignette.xml
index 5156a84c4..a85e94be5 100644
--- a/effects/shaders/vignette.xml
+++ b/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>
\ No newline at end of file