Shader "Zhanyou/AstroCharacter"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_LightDir ("Light Direction", Vector) = (1, 1, 1, 0)
		_LightColor ("Light Color", Color) = (1, 1, 1, 1)
		_BlendColor ("Blend Color", Color) = (1, 1, 1, 1)
		_Intensity ("Light Intensity", Float) = 1
		_Emission ("Emission", Float) = 0.2
		//_MinLuminance ("Min Luminance", Float) = 0.2
        _Outline ("Outline Power", float) = 1
		_OutlineColor ("Outline Color", Color) = (1, 1, 1, 1)
	}
	SubShader
	{
        Tags { "Queue"="Transparent-100" "RenderType"="Transparent" "IgnoreProjector"="True" }
		Blend SrcAlpha OneMinusSrcAlpha
		LOD 100

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"
            #include "Gles2Helper.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
				float4 tangent : TANGENT;
				float3 normal : NORMAL;
			};

			struct v2f
			{
				float4 vertex : SV_POSITION;
				float2 uv : TEXCOORD0;
				float nDotL : TEXCOORD1;
				float rim : TEXCOORD2;
			};

			uniform sampler2D _MainTex;
			uniform float4 _MainTex_ST;
			uniform half4 _LightDir;
			uniform half4 _LightColor;
			uniform half4 _BlendColor;
			uniform half _Intensity;
			uniform half _Emission;
			//uniform half _MinLuminance;
            uniform half _Outline;
	        uniform half4 _OutlineColor;

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				o.nDotL = dot(v.normal, normalize(_LightDir.xyz));
                half3 objectViewDir = ObjSpaceViewDir(v.vertex);
                TANGENT_SPACE_ROTATION;
                o.rim = saturate(1 - normalize(MUL_3x3_WITH_VECTOR(rotation, objectViewDir)).z);
                o.rim = pow(o.rim, _Outline);
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				fixed4 col = tex2D(_MainTex, i.uv);
				//fixed luminance = Luminance(col.rgb);
				//luminance = luminance * (1 - _MinLuminance) + _MinLuminance;
				//col.rgb = luminance;
				col *= _BlendColor;
				col.rgb = col.rgb * _Emission + col.rgb * max(0, i.nDotL) * _LightColor * _Intensity;
		        col.rgb += _OutlineColor.rgb * _OutlineColor.a * i.rim;
				return col;
			}
			ENDCG
		}
	}
}