Shader "Unlit/TestZwriteShader"
{
		Properties {
		_Color ("Color Tint", Color) = (1, 1, 1, 1)
		_MainTex ("Main Tex", 2D) = "white" {}
		_AlphaScale ("Alpha Scale", Range(0, 5)) = 1
		_IntersectPower("Intersect Power",float) = 1.0
	}
	SubShader {
		Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
		/*
		Pass {
			Tags { "LightMode"="ForwardBase" }
			
			// First pass renders only back faces 
			Cull Front
			
			ZWrite Off
			Blend SrcAlpha OneMinusSrcAlpha
			
			CGPROGRAM
			
			#pragma vertex vert
			#pragma fragment frag
			
			#include "Lighting.cginc"
			
			fixed4 _Color;
			sampler2D _MainTex;
			float4 _MainTex_ST;
			fixed _AlphaScale;
			
			struct a2v {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
				float4 texcoord : TEXCOORD0;
			};
			
			struct v2f {
				float4 pos : SV_POSITION;
				float3 worldNormal : TEXCOORD0;
				float3 worldPos : TEXCOORD1;
				float2 uv : TEXCOORD2;
			};
			
			v2f vert(a2v v) {
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				
				o.worldNormal = UnityObjectToWorldNormal(v.normal);
				
				o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
				
				o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
				
				return o;
			}
			
			fixed4 frag(v2f i) : SV_Target {
				fixed3 worldNormal = normalize(i.worldNormal);
				fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));
				
				fixed4 texColor = tex2D(_MainTex, i.uv);
				
				fixed3 albedo = texColor.rgb * _Color.rgb;
				
				fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz * albedo;
				
				fixed3 diffuse = _LightColor0.rgb * albedo * max(0, dot(worldNormal, worldLightDir));
				
				return fixed4(ambient + diffuse, texColor.a * _AlphaScale);
			}
			
			ENDCG
		}
		*/
		Pass {
			Tags { "LightMode"="ForwardBase" }
			
			// Second pass renders only front faces 
			Cull Back
			
			ZWrite On
			Blend SrcAlpha OneMinusSrcAlpha
			
			CGPROGRAM
			
			#pragma vertex vert
			#pragma fragment frag
			
			#include "Lighting.cginc"
			
			fixed4 _Color;
			sampler2D _MainTex;
			float4 _MainTex_ST;
			fixed _AlphaScale;
			sampler2D _CameraDepthTexture;
			float _IntersectPower;
			
			struct a2v {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
				float4 texcoord : TEXCOORD0;
			};
			
			struct v2f {
				float4 pos : SV_POSITION;
				float3 worldNormal : TEXCOORD0;
				float3 worldPos : TEXCOORD1;
				float4 scrPos : TEXCOORD3;
				float2 uv : TEXCOORD2;
			};
			
			v2f vert(a2v v) {
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				
				o.worldNormal = UnityObjectToWorldNormal(v.normal);
				
				//o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
				o.worldPos = normalize(UnityWorldSpaceViewDir(mul(unity_ObjectToWorld, v.vertex)));

				o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);

				o.scrPos = ComputeScreenPos(v.vertex);
				COMPUTE_EYEDEPTH(o.scrPos.z);
				return o;
			}
			
			fixed4 frag(v2f i) : SV_Target {
				fixed3 worldNormal = normalize(i.worldNormal);
				fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));
				
				fixed4 texColor = tex2D(_MainTex, i.uv);
				
				fixed3 albedo = texColor.rgb * _Color.rgb;
				
				fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz * albedo;
				
				fixed3 diffuse = _LightColor0.rgb * albedo * max(0, dot(worldNormal, worldLightDir));

				float depth = tex2D(_CameraDepthTexture, i.uv).r;
				float4 col = float4(depth, depth, depth, 1);
				fixed4 refrCol = tex2D(_CameraDepthTexture, i.scrPos.xy/i.scrPos.w);
				refrCol = fixed4(refrCol.xyz,texColor.a * _AlphaScale);
				//float linearDepth = Linear01Depth(depth);
				
				//return fixed4(ambient + diffuse, texColor.a * _AlphaScale);
				//return fixed4(1,1,1, texColor.a * _AlphaScale * depth*100);
				float rim = 1 - abs(dot(i.worldNormal*_AlphaScale, normalize(i.worldPos)));

				float sceneZ = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(i.scrPos)));
				float partZ = i.scrPos.z;
				float diff = sceneZ - partZ;
				float intersect = (1 - diff) * _IntersectPower;

				return fixed4(1,1,1, rim * _AlphaScale+intersect);
			}
			
			ENDCG
		}
		
	} 
	FallBack "Transparent/VertexLit"
}