varying vec3 Normal;

void vsMain()
{
    Normal = normalize(gl_NormalMatrix*gl_Normal);
    gl_Position = gl_ModelViewProjectionMatrix*gl_Vertex;
}

uniform vec3  Diffuse;
uniform vec3  Specular;
uniform vec3  EdgeColor;
uniform float EdgeThreshold;
uniform float SpecularThreshold;
varying vec3  Light;

void psMain()
{
    vec3 color = Diffuse;
    vec3 light = normalize(Light);
    float lightDotNormal = dot(light, Normal);
    
    if (abs(lightDotNormal) < EdgeThreshold)
    {
        color = EdgeColor;
    }
    if (lightDotNormal > Phong)
    {
        color = Specular;
    }

    gl_FragColor = vec4(color, 1.0);
}