#version 130
#extension all : warn

#pragma STDGL
#pragma optimize(on)
#pragma debug(off)

/* Uniform */
uniform vec3 lightPos;
uniform vec4 diffuse;
uniform vec4 specular;
  
/* In */
varying vec3 normal;

/* Main */
void main(void) {

	/* Compute dot product of light direction and normal vector */
   	float dotProd = max(dot(lightPos, normalize(normal)), 0.0);

   	/* Compute diffuse and specular contributions */
   	gl_FragColor = diffuse * dotProd + specular * pow(dotProd, 20.0);

}