1 files changed, 10 insertions, 5 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
index bca4771c27..1c2034de69 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
@@ -310,16 +310,21 @@ vec4 getPosition(vec2 pos_screen)
     return pos;
 }
 
+// get position given a normalized device coordinate
+vec3 getPositionWithNDC(vec3 ndc)
+{
+    vec4 pos = inv_proj * vec4(ndc, 1.0);
+    return pos.xyz / pos.w;
+}
+
 vec4 getPositionWithDepth(vec2 pos_screen, float depth)
 {
     vec2 sc = getScreenCoordinate(pos_screen);
-    vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
-    vec4 pos = inv_proj * ndc;
-    pos /= pos.w;
-    pos.w = 1.0;
-    return pos;
+    vec3 ndc = vec3(sc.x, sc.y, 2.0*depth-1.0);
+    return vec4(getPositionWithNDC(ndc), 1.0);
 }
 
+
 vec2 getScreenXY(vec4 clip)
 {
     vec4 ndc = clip;