stk-code_catmod/data/shaders/lightbeam.frag
vincentlj 42c16b32cb OGL32CTX: Replace deprecated "varying" by in/out semantic and make them explicit.
gl_Texcoord[]/gl_Color should be explocitly passed as in/out.
Compilers can pack varyings if the architecture does benefit from it (for instance intel mesa driver) but on the other hand they usually don't change size of varying even if there is only a single component used.
So storing vec2 into vec4 may waste performances.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14974 178a84e3-b1eb-0310-8ba1-8eac791a3b58
2014-01-09 00:17:28 +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
#version 130
uniform sampler2D tex;
uniform float transparency;
in vec2 uv;
noperspective in vec3 eyeVec;
noperspective in 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);
}