stk-code_catmod/data/shaders/lightbeam.frag
samuncle bc0724935e Add copyright header to each shader
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14395 178a84e3-b1eb-0310-8ba1-8eac791a3b58
2013-11-06 23:17:18 +00:00

40 lines
1.4 KiB
GLSL

// SuperTuxKart - a fun racing game with go-kart
// Copyright (C) 2013 the SuperTuxKart team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 3
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// Jean-manuel clemencon supertuxkart
// Creates a cone lightbeam effect by smoothing edges
// Original idea: http://udn.epicgames.com/Three/VolumetricLightbeamTutorial.html
// TODO: Soft edges when it intesects geometry
// Some artefacts are still visible
uniform sampler2D tex;
uniform float transparency;
varying vec2 uv;
varying vec3 eyeVec;
varying vec3 normal;
void main()
{
float inter = dot(normal, eyeVec);
float m = texture2D(tex, vec2(0.5, uv.y)).r;
float alpha = inter * inter * inter * inter * m;
gl_FragColor = vec4(1.0, 1.0, 0.8, alpha);
}