55 lines
1.6 KiB
GLSL
55 lines
1.6 KiB
GLSL
/**
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* @file twotexturecompareF.glsl
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*
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2007, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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out vec4 frag_color;
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uniform sampler2D tex0;
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uniform sampler2D tex1;
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uniform sampler2D dither_tex;
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uniform float dither_scale;
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uniform float dither_scale_s;
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uniform float dither_scale_t;
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in vec2 vary_texcoord0;
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in vec2 vary_texcoord1;
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void main()
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{
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frag_color = abs(texture(tex0, vary_texcoord0.xy) - texture(tex1, vary_texcoord0.xy));
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vec2 dither_coord;
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dither_coord[0] = vary_texcoord0[0] * dither_scale_s;
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dither_coord[1] = vary_texcoord0[1] * dither_scale_t;
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vec4 dither_vec = texture(dither_tex, dither_coord.xy);
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for(int i = 0; i < 3; i++)
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{
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if(frag_color[i] < dither_vec[i] * dither_scale)
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{
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frag_color[i] = 0.f;
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}
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}
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}
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