【unityshader】径向模糊

原文链接：



http://blog.youkuaiyun.com/liulongling/article/details/50787445

Shader "Unlit/模糊"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_Level("等级",float)=0
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			// make fog work
			#pragma multi_compile_fog
			
			#include "UnityCG.cginc"
			 uniform float _Level;
			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				UNITY_FOG_COORDS(1)
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				UNITY_TRANSFER_FOG(o,o.vertex);
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
			   float4 c;
			   float2 center=fixed2(.5,.5);
			   float2 uv=i.uv-center;
			   float3 c1=fixed3(0,0,0);
			   for(fixed j=0;j<_Level;j++)
			   {
			   c1+=tex2D(_MainTex,uv*(1-0.01*j)+center).rgb;
			   }
			   c.rgb=c1/_Level;
			   c.a=1;
				UNITY_APPLY_FOG(i.fogCoord, col);
				return c;
			}
			ENDCG
		}
	}
}