#version 120

//
//  model.vert
//  vertex shader
//
//  Created by Andrzej Kapolka on 10/14/13.
//  Copyright 2013 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

// the tangent vector
attribute vec3 tangent;

// the interpolated position
varying vec4 interpolatedPosition;

// the interpolated normal
varying vec4 interpolatedNormal;

// the interpolated tangent
varying vec4 interpolatedTangent;

void main(void) {

    // transform and store the position, normal and tangent for interpolation
    interpolatedPosition = gl_ModelViewMatrix * gl_Vertex;
    interpolatedNormal = gl_ModelViewMatrix * vec4(gl_Normal, 0.0);
    interpolatedTangent = gl_ModelViewMatrix * vec4(tangent, 0.0);
    
    // pass along the vertex color
    gl_FrontColor = gl_Color;
    
    // and the texture coordinates
    gl_TexCoord[0] = gl_MultiTexCoord0;
    
    // and the shadow texture coordinates
    gl_TexCoord[1] = vec4(dot(gl_EyePlaneS[0], interpolatedPosition), dot(gl_EyePlaneT[0], interpolatedPosition),
        dot(gl_EyePlaneR[0], interpolatedPosition), 1.0); 
      
    // use standard pipeline transform
    gl_Position = ftransform();
}