59 lines
1.8 KiB
GLSL
59 lines
1.8 KiB
GLSL
/**
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* @file normgenF.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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#extension GL_ARB_texture_rectangle : enable
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#ifdef DEFINE_GL_FRAGCOLOR
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out vec4 frag_color;
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#else
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#define frag_color gl_FragColor
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#endif
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uniform sampler2D alphaMap;
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VARYING vec2 vary_texcoord0;
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uniform float stepX;
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uniform float stepY;
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uniform float norm_scale;
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void main()
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{
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float alpha = texture2D(alphaMap, vary_texcoord0).a;
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vec3 right = vec3(norm_scale, 0, (texture2D(alphaMap, vary_texcoord0+vec2(stepX, 0)).a-alpha)*255);
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vec3 left = vec3(-norm_scale, 0, (texture2D(alphaMap, vary_texcoord0-vec2(stepX, 0)).a-alpha)*255);
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vec3 up = vec3(0, -norm_scale, (texture2D(alphaMap, vary_texcoord0-vec2(0, stepY)).a-alpha)*255);
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vec3 down = vec3(0, norm_scale, (texture2D(alphaMap, vary_texcoord0+vec2(0, stepY)).a-alpha)*255);
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vec3 norm = cross(right, down) + cross(down, left) + cross(left,up) + cross(up, right);
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norm = normalize(norm);
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norm *= 0.5;
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norm += 0.5;
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frag_color = vec4(norm, alpha);
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}
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