From 2003495166c81366c8a60c9e196d42f8e160eba0 Mon Sep 17 00:00:00 2001
From: Olivier Prat <olivier@zvork.fr>
Date: Thu, 7 Sep 2017 12:30:20 +0200
Subject: [PATCH] Adjustments to half texel fix

---
 libraries/render-utils/src/Outline.slh | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/libraries/render-utils/src/Outline.slh b/libraries/render-utils/src/Outline.slh
index 6e510581b4..ac56e4c95c 100644
--- a/libraries/render-utils/src/Outline.slh
+++ b/libraries/render-utils/src/Outline.slh
@@ -32,14 +32,19 @@ const float OPACITY_EPSILON = 5e-3;
 <@func main(IS_FILLED)@>
 
 void main(void) {
-	float outlinedDepth = texture(outlinedDepthMap, varTexCoord0).x;
+    // We offset by half a texel to be centered on the depth sample. If we don't do this
+    // the blur will have a different width between the left / right sides and top / bottom
+    // sides of the silhouette
+    vec2 halfTexel = getInvWidthHeight() / 2;
+    vec2 texCoord0 = varTexCoord0+halfTexel;
+	float outlinedDepth = texture(outlinedDepthMap, texCoord0).x;
     float intensity = 0.0;
 
     if (outlinedDepth < FAR_Z) {
         // We're not on the far plane so we are on the outlined object, thus no outline to do!
 <@if IS_FILLED@>
         // But we need to fill the interior
-        float sceneDepth = texture(sceneDepthMap, varTexCoord0).x;
+        float sceneDepth = texture(sceneDepthMap, texCoord0).x;
         // Transform to linear depth for better precision
         outlinedDepth = -evalZeyeFromZdb(outlinedDepth);
         sceneDepth = -evalZeyeFromZdb(sceneDepth);
@@ -56,10 +61,7 @@ void main(void) {
     } else {
         float weight = 0.0;
         vec2 deltaUv = params._size / params._blurKernelSize;
-        // We offset by half a texel to be centered on the depth sample. If we don't do this
-        // the blur will have a different width between the left / right sides and top / bottom
-        // sides of the silhouette
-        vec2 lineStartUv = varTexCoord0 + (getInvWidthHeight() - params._size) / 2.0; 
+        vec2 lineStartUv = texCoord0 - params._size / 2.0; 
         vec2 uv;
         int x;
         int y;