From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 15 Jan 2010 21:13:48 +0000 (+0000)
Subject: Add a hackish support for positional lights in ShadowMap
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=287985a83e42e1e0af0c1522272d97d96fce00f9;p=libs%2Fgl.git

Add a hackish support for positional lights in ShadowMap
---

diff --git a/source/shadowmap.cpp b/source/shadowmap.cpp
index 5f66d898..9dadb8fe 100644
--- a/source/shadowmap.cpp
+++ b/source/shadowmap.cpp
@@ -54,9 +54,19 @@ void ShadowMap::set_texture_unit(unsigned u)
 
 void ShadowMap::prepare()
 {
-	const Vector4 &lpos=light.get_position();
+	Vector4 lpos=light.get_position();
 	if(lpos.w)
-		throw Exception("Non-directional lights not supported at the moment");
+	{
+		/* XXX Not really proper way to support positional lights, but good
+		enough when the light source is far away */
+		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 matrix[16];
 	if(abs(lpos.z)>=abs(lpos.x) && abs(lpos.z)>=abs(lpos.y))