#ifdef GL_ES
precision mediump float;
#endif

uniform vec4 U_AmbientMaterial;
uniform vec4 U_AmbientLight;

uniform vec4 U_LightPos;
uniform vec4 U_DiffuseMaterial;
uniform vec4 U_DiffuseLight;

varying vec4 V_Normal;
void main()
{
	//ambient
	vec4 ambirntColor = U_AmbientMaterial*U_AmbientLight;

	//diffuse
	vec3 L = normalize(U_LightPos.xyz - vec3(0));
	vec3 n = normalize(V_Normal.xyz);
	float diffuseIntensity = max(0.0, dot(L,n));
	vec4 diffuseColor = U_DiffuseMaterial * U_DiffuseLight * diffuseIntensity;

	gl_FragColor=ambirntColor + diffuseColor;
}