41 lines
1.4 KiB
GLSL
41 lines
1.4 KiB
GLSL
// SuperTuxKart - a fun racing game with go-kart
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// Copyright (C) 2013 the SuperTuxKart team
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 3
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// of the License, or (at your option) any later version.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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// Jean-manuel clemencon supertuxkart
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// Creates a cone lightbeam effect by smoothing edges
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// Original idea: http://udn.epicgames.com/Three/VolumetricLightbeamTutorial.html
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// TODO: Soft edges when it intesects geometry
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// Some artefacts are still visible
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#version 130
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uniform sampler2D tex;
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uniform float transparency;
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in vec2 uv;
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noperspective in vec3 eyeVec;
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noperspective in vec3 normal;
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out vec4 FragColor;
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void main()
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{
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float inter = dot(normal, eyeVec);
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float m = texture(tex, vec2(0.5, uv.y)).r;
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float alpha = inter * inter * inter * inter * m;
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FragColor = vec4(1.0, 1.0, 0.8, alpha);
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}
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