#version 150

uniform vec4 diffuse;
uniform vec4 ambient;
uniform vec4 specular;
uniform float shininess;

uniform vec3 lightPos;

in vec4 eye;
in vec3 normal;

in vec4 passColor;
in vec2 passTexCoord;

out vec4 outColor;

void main()
{
    vec4 spec = vec4(0.0);

    vec3 n = normalize(normal);
    vec3 e = normalize(vec3(eye));

    float intensity = max(dot(n, lightPos), 0.0);

    if(intensity > 0.0)
    {
        vec3 h = normalize(lightPos + e);
        float intSpec = max(dot(h,n), 0.0);
        spec = specular * pow(intSpec, shininess);
    }

    outColor = max(intensity * diffuse + spec, ambient);
}