Shader "Custom/piGlowShader"
{
	Properties
	{
		_Color 		("_Color:"		, Color) = (1,1,1,1)

		_Specular 	("_Specular:"	, Color) = (1,1,1,1)
		_Shininess 	("_Shininess:"	, float) = 0.5

		_Glow 		("_Glow:"		, float) = 0.0
	}


	SubShader
	{
		Pass
		{
			Name "FORWARD"
			Tags { "RenderType"="Opaque" "LightMode"="ForwardBase"}

			Lighting On

// - - - - - - -

CGPROGRAM

#pragma vertex vertex_shader
#pragma fragment fragment_shader

#pragma fragmentoption ARB_precision_hint_fastest
#pragma multi_compile_fwdbase


#include "HLSLSupport.cginc"
#include "UnityCG.cginc"
#include "Lighting.cginc"
#include "AutoLight.cginc"


// important to pass the properties here
float4 _Color;
float4 _Specular;
float  _Shininess;
float  _Glow;


struct v2f
{
	float4 position : POSITION;
	float4 color : COLOR;
};


// Lighting Function
inline half3 LightingLambertVS (half3 normal, half3 lightDir)
{
	half diff = max ( 0, dot( normal, lightDir ) );
	return _LightColor0.rgb * (diff * 2);
}


v2f vertex_shader ( appdata_base i)
{
	v2f o;

	o.position = mul(UNITY_MATRIX_MVP, i.vertex);


	// - - - AMBIENT - - -

	o.color = UNITY_LIGHTMODEL_AMBIENT * _Color;


	// - - - DIFFUSE - - -

	float3 worldN = mul((float3x3)_Object2World, i.normal);

	float LdotN = saturate(  dot ( _WorldSpaceLightPos0, worldN )  );

	o.color += LdotN * _Color * _LightColor0;


	// - - - SPECULAR - - -
	float3 L = normalize( ObjSpaceLightDir( i.vertex ) );
	float3 V = normalize( ObjSpaceViewDir( i.vertex ) );
	float3 H = normalize( L + V );

	float NdotH = saturate(  dot (i.normal, H)  );

	float4 spec = _Specular * _LightColor0 * pow( NdotH, _Shininess * 128 );

	o.color += spec;

	// - - - GLOW - - -

	float4 glow = _Glow * LdotN * _LightColor0;
	o.color += glow;

	// - - - - -

	return o;
}

float4 fragment_shader( v2f i ) : COLOR
{
	return i.color;
}
ENDCG

// - - - - - - -

		}
	}
}