Add shaders

Sources/Shaders/EnviroDownsampleDepth.shader

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+Shader "Hidden/Enviro/DepthDownsample"
+{
+
+CGINCLUDE
+
+#include "UnityCG.cginc"
+
+	struct v2f 
+	{
+		float4 pos : SV_POSITION;
+		float2 uv : TEXCOORD0;
+		UNITY_VERTEX_OUTPUT_STEREO
+	};
+
+	UNITY_DECLARE_DEPTH_TEXTURE(_CameraDepthTexture);
+	float2 _PixelSize;
+	float4 _MainTex_TexelSize;
+
+	v2f vert(appdata_img v)
+	{
+		v2f o;
+		UNITY_SETUP_INSTANCE_ID(v); 
+		UNITY_INITIALIZE_OUTPUT(v2f, o); 
+		UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+		o.pos = UnityObjectToClipPos(v.vertex);
+		o.uv = v.texcoord.xy;
+		return o;
+	}
+
+	half4 frag(v2f i) : SV_Target
+	{
+		UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
+
+		float d = Linear01Depth(SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv));
+	
+	if (d>0.99999)
+		return half4(1,1,1,1);
+	else
+		return EncodeFloatRGBA(d);
+	}
+
+		ENDCG
+
+
+	Subshader 
+	{
+		Pass
+		{
+			ZTest Always Cull Off ZWrite Off
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			ENDCG
+		}
+	}
+	Fallback off
+}