/usr/share/openwalnut/shaders/WGELighting-vertex.glsl is in libopenwalnut1 1.2.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Project: OpenWalnut ( http://www.openwalnut.org )
//
// Copyright 2009 OpenWalnut Community, BSV-Leipzig and CNCF-CBS
// For more information see http://www.openwalnut.org/copying
//
// This file is part of OpenWalnut.
//
// OpenWalnut is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// OpenWalnut 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
//
//---------------------------------------------------------------------------
#ifndef WGELIGHTING_VERTEX_GLSL
#define WGELIGHTING_VERTEX_GLSL
#version 120
varying vec3 normal;
varying vec4 vertex;
varying vec3 halfvec;
const vec4 AMBIENT_BLACK = vec4( 0.0, 0.0, 0.0, 1.0 );
const vec4 DEFAULT_BLACK = vec4( 0.0, 0.0, 0.0, 0.0 );
/**
* Computes normal and makes transformation to eye space.
*/
void prepareLight()
{
// Calculate the normal
normal = normalize( gl_NormalMatrix * gl_Normal ).xyz;
// Transform the vertex position to eye space
vertex = vec4( gl_ModelViewMatrix * gl_Vertex );
vec3 L = normalize( gl_LightSource[0].position.xyz - vertex.xyz );
halfvec = vec3( L + vec3( 0.0, 0.0, 1.0 ) );
}
#endif // WGELIGHTING_VERTEX_GLSL
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