/** 
 * @file class2\wl\gammaF.glsl
 *
 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2007, 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 float gamma;
uniform int no_atmo;

vec3 getAtmosAttenuation();
vec3 getAdditiveColor();

vec3 srgb_to_linear(vec3 col);
vec3 linear_to_srgb(vec3 col);

vec3 scaleSoftClipFragLinear(vec3 light)
{ // identical to non-linear version and that's probably close enough
    if (no_atmo == 1)
    {
        return light;
    }
    //soft clip effect:
    light = 1. - clamp(light, vec3(0.), vec3(1.));
    light = 1. - pow(light, vec3(gamma)); // s/b inverted already CPU-side
    return light;
}

vec3 scaleSoftClipFrag(vec3 light)
{
    if (no_atmo == 1)
    {
        return light;
    }
    //soft clip effect:
    light = 1. - clamp(light, vec3(0.), vec3(1.));
    light = 1. - pow(light, vec3(gamma)); // s/b inverted already CPU-side
    return light;
}

vec3 scaleSoftClip(vec3 light)
{
    return scaleSoftClipFrag(light);
}

vec3 fullbrightScaleSoftClipFrag(vec3 light, vec3 add, vec3 atten)
{
    //return mix(scaleSoftClipFrag(light.rgb), add, atten);
    return scaleSoftClipFrag(light.rgb);
}

vec3 fullbrightScaleSoftClip(vec3 light)
{
    return fullbrightScaleSoftClipFrag(light, getAdditiveColor(), getAtmosAttenuation());
}