uniform vec4 U_AmbientLightColor;
uniform vec4 U_AmbientMaterial;
uniform vec3 U_LightPos;
uniform vec4 U_DiffuseLightColor;
uniform vec4 U_DiffuseMaterial;


varying vec3 V_Normal;

void main()
{
	//ambient
	vec4 ambientColor = U_AmbientLightColor * U_AmbientMaterial;

	//diffuse
	vec3 N = normalize(V_Normal);
	vec3 L = normalize(U_LightPos);
	float diffuseIntensity = max(0.0, dot(L,N));
	vec4 diffuseColor = U_DiffuseLightColor * U_DiffuseMaterial * diffuseIntensity;

	gl_FragColor = ambientColor + diffuseColor;
}