/*
 * CS5600 University of Utah
 * Charles McGarvey
 * mcgarvey@eng.utah.edu
 */

#define MAX_LIGHTS 2

attribute vec4  vPosition;
attribute vec3  vNormal;
attribute vec2  vTextureCoord;
attribute vec4  vColor;

uniform mat4    view;
uniform mat4    model;
uniform mat4    projection;
uniform int     numLights;
uniform vec3    eye;
uniform vec4    light[MAX_LIGHTS];

varying vec3    normal;
varying vec2    textureCoord;
varying vec4    color;
varying vec3    lightDir[MAX_LIGHTS];
varying vec3    eyeVec;

void main()
{
    gl_Position = projection * view * model * vPosition;
    normal = vec3(model * vec4(vNormal, 0.0));
    textureCoord = vTextureCoord;
    color = vColor;

    vec4 pos = model * vPosition;
    eyeVec = eye - pos.xyz;

    int i;
    for (i = 0; i < numLights; ++i) {
        lightDir[i] = light[i].xyz - pos.xyz;
    }
}