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Shader "Custom/FontBlur"
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{
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Properties
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{
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[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
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_Color ("Tint", Color) = (1,1,1,1)
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_StencilComp ("Stencil Comparison", Float) = 8
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_Stencil ("Stencil ID", Float) = 0
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_StencilOp ("Stencil Operation", Float) = 0
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_StencilWriteMask ("Stencil Write Mask", Float) = 255
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_StencilReadMask ("Stencil Read Mask", Float) = 255
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_ColorMask ("Color Mask", Float) = 15
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[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
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_WaveMap ("WaveMap", 2D) = "white" {}
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_MipMapLeavel("MipMapLeavel", Float) = 0
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_BlurSpread("BlurSpread", Float) = 1
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_StepLength("StepLength", Float) = 0
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}
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SubShader
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{
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Tags
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{
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"Queue"="Transparent"
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"IgnoreProjector"="True"
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"RenderType"="Transparent"
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"PreviewType"="Plane"
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"CanUseSpriteAtlas"="True"
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}
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Stencil
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{
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Ref [_Stencil]
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Comp [_StencilComp]
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Pass [_StencilOp]
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ReadMask [_StencilReadMask]
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WriteMask [_StencilWriteMask]
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}
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Cull Off
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Lighting Off
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ZWrite Off
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ZTest [unity_GUIZTestMode]
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Blend SrcAlpha OneMinusSrcAlpha
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ColorMask [_ColorMask]
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Pass
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{
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Name "Default"
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma target 2.0
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#include "UnityCG.cginc"
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#include "UnityUI.cginc"
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#pragma multi_compile __ UNITY_UI_ALPHACLIP
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struct appdata_t
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{
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float4 vertex : POSITION;
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float4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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fixed4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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float4 worldPosition : TEXCOORD1;
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UNITY_VERTEX_OUTPUT_STEREO
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};
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fixed4 _Color;
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float4 _ClipRect;
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sampler2D _WaveMap;
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float4 _MainTex_TexelSize;
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float _MipMapLeavel;
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float _BlurSpread;
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float4 _WaveMap_ST;
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float _StepLength;
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v2f vert(appdata_t IN)
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{
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v2f OUT;
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UNITY_SETUP_INSTANCE_ID(IN);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
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OUT.worldPosition = IN.vertex;
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OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
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OUT.texcoord = IN.texcoord;
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OUT.color = IN.color * _Color;
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return OUT;
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}
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sampler2D _MainTex;
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fixed4 frag(v2f IN) : SV_Target
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{
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float2 tmp_texcoord = TRANSFORM_TEX(IN.texcoord, _WaveMap);
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//利用灰度图的X轴得到每个像素一个随机方向，并将方向转换成弧度制
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half direction = tex2D(_WaveMap, tmp_texcoord).x * 3.1415926 * 2;
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//从而得到需要采样点的sin和cos
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fixed s;
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fixed c;
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sincos(direction, s, c);
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//根据外部输入的步长和模糊范围，算出UV偏移
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float u_offset = _StepLength * c * _BlurSpread;
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float v_offset = _StepLength * s * _BlurSpread;
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//获取RT,每次采样都是根据时间来调整mipmap，用不同的采样结果得到模糊效果
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half4 sum = tex2Dlod(_MainTex, float4(IN.texcoord,0,_MipMapLeavel)) ;
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float2 uv_1 = IN.texcoord;
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float2 uv_2 = IN.texcoord;
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//第一次UV偏移采样
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uv_1.x += u_offset;
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uv_1.y += v_offset;
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sum += tex2Dlod(_MainTex, float4(uv_1,0,_MipMapLeavel)) ;
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//第二次UV偏移采样
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uv_2.x -= u_offset;
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uv_2.y -= v_offset;
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sum += tex2Dlod(_MainTex, float4(uv_2,0,_MipMapLeavel)) ;
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//因为采样了三次 所以除以3
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sum /= 3;
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half4 color = sum * IN.color;
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color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
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#ifdef UNITY_UI_ALPHACLIP
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clip (color.a - 0.001);
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#endif
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return color;
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}
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ENDCG
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}
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}
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} |
