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/**
* @file twotexturecompareF.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
* $/LicenseInfo$
*/
out vec4 frag_color;
uniform sampler2D tex0;
uniform sampler2D tex1;
uniform sampler2D dither_tex;
uniform float dither_scale;
uniform float dither_scale_s;
uniform float dither_scale_t;
in vec2 vary_texcoord0;
in vec2 vary_texcoord1;
void main()
{
frag_color = abs(texture(tex0, vary_texcoord0.xy) - texture(tex1, vary_texcoord0.xy));
vec2 dither_coord;
dither_coord[0] = vary_texcoord0[0] * dither_scale_s;
dither_coord[1] = vary_texcoord0[1] * dither_scale_t;
vec4 dither_vec = texture(dither_tex, dither_coord.xy);
for(int i = 0; i < 3; i++)
{
if(frag_color[i] < dither_vec[i] * dither_scale)
{
frag_color[i] = 0.f;
}
}
}
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