From: spog <spog>
Date: Mon, 31 Jul 2006 20:47:13 +0000 (+0000)
Subject: added missing file
X-Git-Tag: xonotic-v0.7.0~16^2~12^2~198
X-Git-Url: https://de.git.xonotic.org/?p=xonotic%2Fnetradiant.git;a=commitdiff_plain;h=4e142f7d8761aa8506ba5efd6f8a270d4b7dcf6c

added missing file

git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/trunk@96 8a3a26a2-13c4-0310-b231-cf6edde360e5
---

diff --git a/setup/data/tools/gl/utils.cg b/setup/data/tools/gl/utils.cg
new file mode 100644
index 00000000..63bfcb6c
--- /dev/null
+++ b/setup/data/tools/gl/utils.cg
@@ -0,0 +1,36 @@
+/// ============================================================================
+/*
+Copyright (C) 2004 Robert Beckebans <trebor_7@users.sourceforge.net>
+Please see the file "AUTHORS" for a list of contributors
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+*/
+/// ============================================================================
+
+// fresnel approximation
+float	fast_fresnel(float3 I, float3 N, float3 fresnel_values)
+{
+	float power = fresnel_values.x;
+	float scale = fresnel_values.y;
+	float bias  = fresnel_values.z;
+
+	return bias + pow(1.0 - dot(I, N), power) * scale;
+}
+
+float3	CG_Expand(float3 v)
+{
+	return (v - 0.5) * 2;	// expand a range-compressed vector
+}