From cd17687f01420952712a500107e0f93e7ab8d5f8 Mon Sep 17 00:00:00 2001
From: Jacek Antonelli
Date: Fri, 15 Aug 2008 23:45:34 -0500
Subject: Second Life viewer sources 1.19.1.0

---
 .../shaders/class1/lighting/lightFuncV.glsl        | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 linden/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl

(limited to 'linden/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl')

diff --git a/linden/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl b/linden/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl
new file mode 100644
index 0000000..3e8fdfb
--- /dev/null
+++ b/linden/indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl
@@ -0,0 +1,34 @@
+/** 
+ * @file lightFuncV.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+
+float calcDirectionalLight(vec3 n, vec3 l)
+{
+	float a = max(dot(n,l),0.0);
+	return a;
+}
+
+float calcPointLight(vec3 v, vec3 n, vec4 lp, float la)
+{
+	//get light vector
+	vec3 lv = lp.xyz-v;
+	
+	//get distance
+	float d = length(lv);
+	
+	//normalize light vector
+	lv *= 1.0/d;
+	
+	//distance attenuation
+	float da = clamp(1.0/(la * d), 0.0, 1.0);
+	
+	//angular attenuation
+	da *= calcDirectionalLight(n, lv);
+	
+	return da;	
+}
+
-- 
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