From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 9 Sep 2012 21:46:22 +0000 (+0300)
Subject: Don't assume a directional light's position vector to be unit length
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=bd141418a0712feeb64bcaff7f57e29913b0317b

Don't assume a directional light's position vector to be unit length
---

diff --git a/source/shadowmap.cpp b/source/shadowmap.cpp
index ad40442f..6f62870b 100644
--- a/source/shadowmap.cpp
+++ b/source/shadowmap.cpp
@@ -74,6 +74,7 @@ void ShadowMap::setup_frame() const
 	rendered = true;
 
 	Vector4 lpos = light.get_position();
+
 	if(lpos.w)
 	{
 		/* XXX Not really proper way to support positional lights, but good
@@ -81,12 +82,13 @@ void ShadowMap::setup_frame() const
 		lpos.x -= target.x;
 		lpos.y -= target.y;
 		lpos.z -= target.z;
-		float d = sqrt(lpos.x*lpos.x+lpos.y*lpos.y+lpos.z*lpos.z);
-		lpos.x /= d;
-		lpos.y /= d;
-		lpos.z /= d;
 	}
 
+	float l = sqrt(lpos.x*lpos.x+lpos.y*lpos.y+lpos.z*lpos.z);
+	lpos.x /= l;
+	lpos.y /= l;
+	lpos.z /= l;
+
 	float matrix[16];
 	if(abs(lpos.z)>=abs(lpos.x) && abs(lpos.z)>=abs(lpos.y))
 	{