#ifdef GL_ES
precision mediump float;
#endif
uniform vec4 U_LightPos;
uniform vec4 U_LightAmbient;
uniform vec4 U_LightDiffuse;
uniform vec4 U_AmbientMaterial;
uniform vec4 U_DiffuseMaterial;
varying vec4 V_Color;
varying vec3 V_Normal;
varying vec3 V_WorldPos;
void main()
{
	vec4 color=vec4(0.0,0.0,0.0,0.0);
	vec4 ambientColor=U_LightAmbient*U_AmbientMaterial;
	
	float distance=0.0;
	float constantFactor=1.0;
	float linearFactor=0.0;
	float quadricFactor=0.0;
	vec3 L=U_LightPos.xyz-V_WorldPos;
	distance=length(L);
	float attenuation=1.0/(constantFactor+linearFactor*distance+quadricFactor*quadricFactor*distance);
	L=normalize(L);
	vec3 n=normalize(V_Normal);
	float diffuseIntensity=max(0.0,dot(L,n));
	vec4 diffuseColor=U_LightDiffuse*U_DiffuseMaterial*diffuseIntensity*attenuation*4.0;
	
	color=ambientColor+diffuseColor;
	gl_FragData[0]=color*V_Color;
	gl_FragData[1]=color*V_Color;
}