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/**
* @file moonF.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
* $/LicenseInfo$
*/
#extension GL_ARB_texture_rectangle : enable
/*[EXTRA_CODE_HERE]*/
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_color;
#else
#define frag_color gl_FragColor
#endif
uniform vec4 color;
uniform vec4 sunlight_color;
uniform vec4 moonlight_color;
uniform vec3 lumWeights;
uniform float moon_brightness;
uniform float minLuminance;
uniform sampler2D diffuseMap;
uniform sampler2D altDiffuseMap;
uniform float blend_factor; // interp factor between moon A/B
VARYING vec2 vary_texcoord0;
void main()
{
vec4 moonA = texture2D(diffuseMap, vary_texcoord0.xy);
vec4 moonB = texture2D(altDiffuseMap, vary_texcoord0.xy);
vec4 c = mix(moonA, moonB, blend_factor);
// mix factor which blends when sunlight is brighter
// and shows true moon color at night
vec3 luma_weights = vec3(0.2, 0.3, 0.2);
float mix = 1.0f - dot(normalize(sunlight_color.rgb), luma_weights);
vec3 exp = vec3(1.0 - mix * moon_brightness) * 2.0 - 1.0;
c.rgb = pow(c.rgb, exp);
//c.rgb *= moonlight_color.rgb;
frag_color = vec4(c.rgb, c.a);
}
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