/** 
 * @file atmosphericsHelpersF.glsl 
 *
 * $LicenseInfo:firstyear=2005&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2005, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */
 
uniform vec4 sunlight_color;
uniform vec4 light_ambient;

vec3 atmosAmbient(vec3 light)
{
    return light + light_ambient.rgb;
}

vec3 atmosAffectDirectionalLight(float lightIntensity)
{
    return sunlight_color.rgb * lightIntensity;
}

vec3 atmosGetDiffuseSunlightColor()
{
    return sunlight_color.rgb;
}

vec3 scaleDownLight(vec3 light)
{
    /* stub function for fallback compatibility on class1 hardware */
    return light;
}