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/**
* @file class2/windlight/skyF.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
* $/LicenseInfo$
*/
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_color;
#else
#define frag_color gl_FragColor
#endif
/////////////////////////////////////////////////////////////////////////
// The fragment shader for the sky
/////////////////////////////////////////////////////////////////////////
VARYING vec4 vary_HazeColor;
uniform vec4 gamma;
/// Soft clips the light with a gamma correction
vec3 scaleSoftClip(vec3 light) {
//soft clip effect:
light = 1. - clamp(light, vec3(0.), vec3(1.));
light = 1. - pow(light, gamma.xxx);
return light;
}
void main()
{
// Potential Fill-rate optimization. Add cloud calculation
// back in and output alpha of 0 (so that alpha culling kills
// the fragment) if the sky wouldn't show up because the clouds
// are fully opaque.
vec4 color;
color = vary_HazeColor;
color *= 2.;
/// Gamma correct for WL (soft clip effect).
frag_color.rgb = scaleSoftClip(color.rgb);
frag_color.a = 1.0;
}
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