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/**
* @file impostorF.glsl
*
* $LicenseInfo:firstyear=2011&license=viewerlgpl$
* 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
* $/LicenseInfo$
*/
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_data[3];
#else
#define frag_data gl_FragData
#endif
uniform float minimum_alpha;
uniform sampler2D diffuseMap;
uniform sampler2D normalMap;
uniform sampler2D specularMap;
VARYING vec2 vary_texcoord0;
vec3 decode_normal (vec2 enc)
{
vec2 fenc = enc*4-2;
float f = dot(fenc,fenc);
float g = sqrt(1-f/4);
vec3 n;
n.xy = fenc*g;
n.z = 1-f/2;
return n;
}
vec2 encode_normal(vec3 n)
{
float f = sqrt(8 * n.z + 8);
return n.xy / f + 0.5;
}
vec3 linear_to_srgb(vec3 cl)
{
cl = clamp(cl, vec3(0), vec3(1));
vec3 low_range = cl * 12.92;
vec3 high_range = 1.055 * pow(cl, vec3(0.41666)) - 0.055;
bvec3 lt = lessThan(cl,vec3(0.0031308));
#ifdef OLD_SELECT
vec3 result;
result.r = lt.r ? low_range.r : high_range.r;
result.g = lt.g ? low_range.g : high_range.g;
result.b = lt.b ? low_range.b : high_range.b;
return result;
#else
return mix(high_range, low_range, lt);
#endif
}
void main()
{
vec4 col = texture2D(diffuseMap, vary_texcoord0.xy);
if (col.a < minimum_alpha)
{
discard;
}
vec4 norm = texture2D(normalMap, vary_texcoord0.xy);
vec4 spec = texture2D(specularMap, vary_texcoord0.xy);
col.rgb = linear_to_srgb(col.rgb);
frag_data[0] = vec4(col.rgb, 0.0);
frag_data[1] = spec;
frag_data[2] = vec4(norm.xy,0,0);
}
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