毛玻璃效果Shader

	Shader "Hsj/GroundGlass" {
		Properties{
			_blurSizeXY("BlurSizeXY", Range(0,10)) = 2
		}
			SubShader{
			// Draw ourselves after all opaque geometry
			Tags{ "Queue" = "Transparent" }
			// Grab the screen behind the object into _GrabTexture
			GrabPass{}
			// Render the object with the texture generated above
			Pass{

			CGPROGRAM
#pragma debug
#pragma vertex vert
#pragma fragment frag
#pragma target 3.0
			sampler2D _GrabTexture : register(s0);
		float _blurSizeXY;
		struct data {
			float4 vertex : POSITION;
			float3 normal : NORMAL;
		};

		struct v2f {
			float4 position : POSITION;
			float4 screenPos : TEXCOORD0;
		};

		v2f vert(data i) {
			v2f o;
			o.position = UnityObjectToClipPos(i.vertex);
			o.screenPos = o.position;
			return o;
		}

		half4 frag(v2f i) : COLOR
		{
			float2 screenPos = i.screenPos.xy / i.screenPos.w;
			float depth = _blurSizeXY * 0.0005;
			screenPos.x = (screenPos.x + 1) * 0.5;
			screenPos.y = 1 - (screenPos.y + 1) * 0.5;
			half4 sum = half4(0.0h,0.0h,0.0h,0.0h);
			sum += tex2D(_GrabTexture, float2(screenPos.x - 5.0 * depth, screenPos.y + 5.0 * depth)) * 0.025;
			sum += tex2D(_GrabTexture, float2(screenPos.x + 5.0 * depth, screenPos.y - 5.0 * depth)) * 0.025;

			sum += tex2D(_GrabTexture, float2(screenPos.x - 4.0 * depth, screenPos.y + 4.0 * depth)) * 0.05;
			sum += tex2D(_GrabTexture, float2(screenPos.x + 4.0 * depth, screenPos.y - 4.0 * depth)) * 0.05;

			sum += tex2D(_GrabTexture, float2(screenPos.x - 3.0 * depth, screenPos.y + 3.0 * depth)) * 0.09;
			sum += tex2D(_GrabTexture, float2(screenPos.x + 3.0 * depth, screenPos.y - 3.0 * depth)) * 0.09;

			sum += tex2D(_GrabTexture, float2(screenPos.x - 2.0 * depth, screenPos.y + 2.0 * depth)) * 0.12;
			sum += tex2D(_GrabTexture, float2(screenPos.x + 2.0 * depth, screenPos.y - 2.0 * depth)) * 0.12;

			sum += tex2D(_GrabTexture, float2(screenPos.x - 1.0 * depth, screenPos.y + 1.0 * depth)) *  0.15;
			sum += tex2D(_GrabTexture, float2(screenPos.x + 1.0 * depth, screenPos.y - 1.0 * depth)) *  0.15;


			sum += tex2D(_GrabTexture, screenPos - 5.0 * depth) * 0.025;
			sum += tex2D(_GrabTexture, screenPos - 4.0 * depth) * 0.05;
			sum += tex2D(_GrabTexture, screenPos - 3.0 * depth) * 0.09;
			sum += tex2D(_GrabTexture, screenPos - 2.0 * depth) * 0.12;
			sum += tex2D(_GrabTexture, screenPos - 1.0 * depth) * 0.15;
			sum += tex2D(_GrabTexture, screenPos) * 0.16;
			sum += tex2D(_GrabTexture, screenPos + 5.0 * depth) * 0.15;
			sum += tex2D(_GrabTexture, screenPos + 4.0 * depth) * 0.12;
			sum += tex2D(_GrabTexture, screenPos + 3.0 * depth) * 0.09;
			sum += tex2D(_GrabTexture, screenPos + 2.0 * depth) * 0.05;
			sum += tex2D(_GrabTexture, screenPos + 1.0 * depth) * 0.025;

			return sum / 2;
		}
			ENDCG
		}
		}
			Fallback Off
	}