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git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/trunk@96 8a3a26a2-13c4-0310-b231-cf6edde360e5
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spog 2006-07-31 20:47:13 +00:00
parent d498eb592d
commit 4e142f7d87
1 changed files with 36 additions and 0 deletions
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setup/data/tools/gl/utils.cg Normal file
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/// ============================================================================
/*
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
}