Shader "Zhanyou/Particles/RimColor" {
Properties {
	_TintColor ("Tint Color", Color) = (0.5,0.5,0.5,0.5)
	_InnerColor ("Inner Color", Color) = (0.5,0.5,0.5,0.5)
	_InnerColorPower ("Inner Color Power", Range(0.0,1.0)) = 0.5
	_RimPower ("Rim Power", Range(0.0,5.0)) = 2.5
	_AlphaPower ("Alpha Rim Power", Range(0.0,8.0)) = 4.0
	_AllPower ("All Power", Range(0.0, 10.0)) = 1.0
}

Category {
	Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" }
	Blend SrcAlpha OneMinusSrcAlpha
	ColorMask RGB
	//Cull Off
	Lighting Off
	ZWrite Off
	
	SubShader {
		Pass {
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma target 2.0
			#pragma multi_compile_particles
			#pragma multi_compile_fog

			#include "UnityCG.cginc"

			fixed4 _TintColor;
			fixed4 _InnerColor;
			half _InnerColorPower;
			half _RimPower;
			half _AlphaPower;
			half _AllPower;

			struct appdata_t {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
				fixed4 color : COLOR;
			};

			struct v2f {
				float4 vertex : SV_POSITION;
				fixed4 color : COLOR;
				half3 worldNormal : TEXCOORD0;
				float3 worldPos : TEXCOORD1;
				UNITY_FOG_COORDS(2)
			};
			
			float4 _MainTex_ST;

			v2f vert (appdata_t v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.color = v.color;
				o.worldNormal = UnityObjectToWorldNormal(v.normal);//normalize(unity_WorldToObject[0].xyz * v.normal.x + unity_WorldToObject[1].xyz * v.normal.y + unity_WorldToObject[2].xyz * v.normal.z);
				o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
				UNITY_TRANSFER_FOG(o,o.vertex);
				return o;
			}

			fixed4 frag (v2f i) : SV_Target
			{
				half3 worldNormal = i.worldNormal;
				half3 viewDir = normalize(UnityWorldSpaceViewDir(i.worldPos));
				half rim = 1.0 - saturate(dot (viewDir, worldNormal));
				fixed4 col = _TintColor * i.color;
				col.rgb = col.rgb * pow(rim, _RimPower) * _AllPower + _InnerColor.rgb * 2 * _InnerColorPower;
				col.a *= pow (rim, _AlphaPower) * _AllPower;
				UNITY_APPLY_FOG_COLOR(i.fogCoord, col, fixed4(0,0,0,0)); // fog towards black due to our blend mode
				return col;
			}
			ENDCG 
		}
	}	
}
}