//  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 (c) supertuxkart 2013
// Creates a bubble gum shield effect
// ---
// TODO: The texture should reflect the strength of the shield, 
// such that the user gets to know whether the shield has several 
// "layers" or whether the shield is about to break. 
#version 130
uniform mat4 ModelViewMatrix;
uniform mat4 ProjectionMatrix;
uniform mat4 TransposeInverseModelView;
out vec2 uv;
noperspective out vec3 eyeVec;
noperspective out vec3 normal;

void main()
{
	vec4 viewp = ModelViewMatrix * gl_Vertex;

	eyeVec = normalize(-viewp).xyz;
	normal = (TransposeInverseModelView * vec4(gl_Normal, 1.).xyz;

	gl_Position = ProjectionMatrix * viewp;

	uv = (gl_TextureMatrix[0] * gl_MultiTexCoord0).st;
}