Add shaders

Sources/Shaders/DepthTexPreview.shader

@@ -0,0 +1,47 @@
+Shader "GlobalSnow/Editor/DepthTexPreview"
+{
+	Properties
+	{
+		_MainTex ("Texture", 2D) = "white" {}
+	}
+	SubShader
+	{
+		Tags { "RenderType"="Opaque" }
+
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+				float2 uv : TEXCOORD0;
+			};
+
+			struct v2f
+			{
+				float2 uv : TEXCOORD0;
+				float4 vertex : SV_POSITION;
+			};
+
+			sampler2D _MainTex;
+            sampler2D _GS_DepthTexture;
+			
+			v2f vert (appdata v)
+			{
+				v2f o;
+				o.vertex = UnityObjectToClipPos(v.vertex);
+				o.uv = v.uv;
+				return o;
+			}
+			
+			fixed4 frag (v2f i) : SV_Target
+			{
+				return tex2D(_GS_DepthTexture, i.uv).rrrr;
+			}
+			ENDCG
+		}
+	}
+}