URP实现毛玻璃效果一

首先URP官方已经给了很详细的实现方案，知乎参考链接：https://zhuanlan.zhihu.com/p/248903320
原理就是在渲染所有3D和UI之后通过URP的Cbuffer shader进行屏幕抓取，然后再对抓到的图进行高斯模糊，然后映射到指定的毛玻璃效果的图上。

URP设置

默认的ForwardRender里层级过滤设为所有，UI层级也好，毛玻璃层级也好都需要被渲染
GrabColor里：通过指定的Blurshader指定抓屏的层级（去掉毛玻璃层），开启抓屏并保存，然后经过高斯模糊，输出到指定的TextureName的RT上。
对需要实现毛玻璃效果的物体添加毛玻璃材质球，此材质球的shader中使用上一步获得的RT，映射出毛玻璃效果
此操作涉及到三个重点：1.URP设置 2.抓屏shader 3.毛玻璃效果shader

抓屏Shader

Shader "WeiLe/Blur_Gaussian"
{Properties{blurRangeX("Blur x", float) = 1blurRangeY("Blur y", float) = 1 }SubShader{Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline"}LOD 100Pass //pass 0{Name "BlurX"ZTest AlwaysZWrite OffCull OffHLSLPROGRAM#pragma vertex vert#pragma fragment frag#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"struct Attributes{float4 positionOS       : POSITION;float2 uv               : TEXCOORD0;};struct Varyings{float4 positionCS       : SV_POSITION;float2 uv               : TEXCOORD0;};CBUFFER_START(UnityPerMaterial)float4  _SourceTex_Blur1_ST;float   blurRangeX = 1;float4  _SourceTex_Blur1_TexelSize;CBUFFER_ENDTEXTURE2D (_SourceTex_Blur1);SAMPLER(sampler_SourceTex_Blur1);#define  SampleCount  10Varyings vert(Attributes v){Varyings o = (Varyings)0;o.positionCS = TransformObjectToHClip(v.positionOS.xyz);o.uv.xy  = TRANSFORM_TEX(v.uv.xy, _SourceTex_Blur1);return o;}half4 frag(Varyings i) : SV_Target{UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);half4 col = 0;int s = 0;for (int j = -SampleCount; j <= SampleCount; j++){ int a = SampleCount - abs(j) + 1;s += a;half4 c = a * SAMPLE_TEXTURE2D_X(_SourceTex_Blur1, sampler_SourceTex_Blur1, i.uv + float2(j* blurRangeX * _SourceTex_Blur1_TexelSize.x, 0));col += c;}col /= s;return col;}ENDHLSL}Pass //pass 1{Name "BlurY"ZTest AlwaysZWrite OffCull OffHLSLPROGRAM#pragma vertex vert#pragma fragment frag#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"struct Attributes{float4 positionOS       : POSITION;float2 uv               : TEXCOORD0;};struct Varyings{float4 positionCS       : SV_POSITION;float2 uv               : TEXCOORD0;};CBUFFER_START(UnityPerMaterial)float4 _SourceTex_Blur2_ST;float4 _SourceTex_Blur2_TexelSize;float blurRangeY = 1;CBUFFER_ENDTEXTURE2D(_SourceTex_Blur2);SAMPLER(sampler_SourceTex_Blur2);#define  SampleCount  10Varyings vert(Attributes v){Varyings o = (Varyings)0;o.positionCS = TransformObjectToHClip(v.positionOS.xyz);o.uv.xy  = TRANSFORM_TEX(v.uv.xy, _SourceTex_Blur2);return o;}half4 frag(Varyings i) : SV_Target{UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);half4 col = 0;int s = 0; for (int j = -SampleCount; j <= SampleCount; j++){int a = SampleCount - abs(j) + 1;s += a;half4 c = a*SAMPLE_TEXTURE2D_X(_SourceTex_Blur2, sampler_SourceTex_Blur2, i.uv + float2(0, j* blurRangeY * _SourceTex_Blur2_TexelSize.y));col += c;}col /= s;return col;}ENDHLSL}}
}

毛玻璃Shader

// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)Shader "UI/BlurUI_NoTexture"
{Properties{[PerRendererData] _MainTex ("Sprite Texture", 2D) = "black" {}_Color ("Tint", Color) = (1,1,1,1)_StencilComp ("Stencil Comparison", Float) = 8_Stencil ("Stencil ID", Float) = 0_StencilOp ("Stencil Operation", Float) = 0_StencilWriteMask ("Stencil Write Mask", Float) = 255_StencilReadMask ("Stencil Read Mask", Float) = 255_ColorMask ("Color Mask", Float) = 15[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0}SubShader{Tags{"Queue"="Transparent""IgnoreProjector"="True""RenderType"="Transparent""PreviewType"="Plane""CanUseSpriteAtlas"="True"}Stencil{Ref [_Stencil]Comp [_StencilComp]Pass [_StencilOp]ReadMask [_StencilReadMask]WriteMask [_StencilWriteMask]}Cull OffLighting OffZWrite OffZTest [unity_GUIZTestMode]Blend One OneMinusSrcAlphaColorMask [_ColorMask]Pass{Name "Default"CGPROGRAM#pragma vertex vert#pragma fragment frag#pragma target 2.0#include "UnityCG.cginc"#include "UnityUI.cginc"#pragma multi_compile_local _ UNITY_UI_CLIP_RECT#pragma multi_compile_local _ UNITY_UI_ALPHACLIPstruct appdata_t{float4 vertex   : POSITION;float4 color    : COLOR;float2 texcoord : TEXCOORD0;UNITY_VERTEX_INPUT_INSTANCE_ID};struct v2f{float4 vertex   : SV_POSITION;fixed4 color    : COLOR;float2 texcoord  : TEXCOORD0;float4 worldPosition : TEXCOORD1;half4  mask : TEXCOORD2;float4 projPos: TEXCOORD3; UNITY_VERTEX_OUTPUT_STEREO};sampler2D _MainTex;fixed4 _Color;fixed4 _TextureSampleAdd;float4 _ClipRect; float4 _MainTex_ST;float _UIMaskSoftnessX;float _UIMaskSoftnessY;sampler2D _BlurTexture;v2f vert(appdata_t v){v2f OUT;UNITY_SETUP_INSTANCE_ID(v);UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);float4 vPosition = UnityObjectToClipPos(v.vertex);OUT.worldPosition = v.vertex;OUT.vertex = vPosition;OUT.projPos = ComputeScreenPos( vPosition);float2 pixelSize = vPosition.w;pixelSize /= float2(1, 1) * abs(mul((float2x2)UNITY_MATRIX_P, _ScreenParams.xy));float4 clampedRect = clamp(_ClipRect, -2e10, 2e10);float2 maskUV = (v.vertex.xy - clampedRect.xy) / (clampedRect.zw - clampedRect.xy);OUT.texcoord = TRANSFORM_TEX(v.texcoord.xy, _MainTex);OUT.mask = half4(v.vertex.xy * 2 - clampedRect.xy - clampedRect.zw, 0.25 / (0.25 * half2(_UIMaskSoftnessX, _UIMaskSoftnessY) + abs(pixelSize.xy)));OUT.color = v.color * _Color;return OUT;}fixed4 frag(v2f IN) : SV_Target{half4 texColor = tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd;half4 color = IN.color * texColor;#ifdef UNITY_UI_CLIP_RECThalf2 m = saturate((_ClipRect.zw - _ClipRect.xy - abs(IN.mask.xy)) * IN.mask.zw);color.a *= m.x * m.y;#endif#ifdef UNITY_UI_ALPHACLIPclip (color.a - 0.001);#endif// color.rgb *= color.a;float2 screenUV = (IN.projPos.xy / IN.projPos.w);half4 blurMap = tex2D(_BlurTexture, screenUV);half3 c = blurMap.rgb *  blurMap.a ;// color.rgb; //加上 rgb相当于使用默认的图片进行模糊，不加相当于只模糊half4 finalColor = float4(c, blurMap.a + (1- blurMap.a)*color.a);//blurMap的alpha值为0的时候表示不使用ui模糊return  finalColor;}ENDCG}}
}

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