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140 lines
4.7 KiB
140 lines
4.7 KiB
Shader "Unlit/DualBlur"
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{
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Properties
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{
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_MainTex ("Texture", 2D) = "white" {}
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_Offset("BlurOffset", float) = 1
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}
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SubShader
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{
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CGINCLUDE
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#include "UnityCG.cginc"
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uniform sampler2D _MainTex;
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uniform float4 _MainTex_ST;
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uniform half _Offset;
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float4 _MainTex_TexelSize;
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struct a2f_default
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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// 降采样 顶-片结构体
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struct v2f_downSample
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{
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float4 vertex : SV_POSITION;
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float2 texcoord: TEXCOORD0;
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float2 uv: TEXCOORD1;
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float4 uv01: TEXCOORD2;
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float4 uv23: TEXCOORD3;
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};
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// 升采样 顶-片结构体
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struct v2f_upSample
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{
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float4 vertex: SV_POSITION;
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float2 texcoord: TEXCOORD0;
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float4 uv01: TEXCOORD1;
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float4 uv23: TEXCOORD2;
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float4 uv45: TEXCOORD3;
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float4 uv67: TEXCOORD4;
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};
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v2f_downSample VertDownSample(a2f_default v)
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{
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v2f_downSample o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.texcoord = v.uv;
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#if UNITY_UV_STARTS_AT_TOP
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o.texcoord = o.texcoord * float2(1.0, -1.0) + float2(0.0, 1.0);
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#endif
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float2 uv = TRANSFORM_TEX(o.texcoord, _MainTex);
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_MainTex_TexelSize *= 0.5;
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o.uv = uv;
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o.uv01.xy = uv - _MainTex_TexelSize * float2(1 + _Offset, 1 + _Offset);//top right
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o.uv01.zw = uv + _MainTex_TexelSize * float2(1 + _Offset, 1 + _Offset);//bottom left
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o.uv23.xy = uv - float2(_MainTex_TexelSize.x, -_MainTex_TexelSize.y) * float2(1 + _Offset, 1 + _Offset);//top left
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o.uv23.zw = uv + float2(_MainTex_TexelSize.x, -_MainTex_TexelSize.y) * float2(1 + _Offset, 1 + _Offset);//bottom right
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return o;
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}
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half4 FragDownSample(v2f_downSample i): SV_Target
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{
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half4 sum = tex2D(_MainTex, i.uv) * 4;
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sum += tex2D(_MainTex, i.uv01.xy);
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sum += tex2D(_MainTex, i.uv01.zw);
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sum += tex2D(_MainTex, i.uv23.xy);
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sum += tex2D(_MainTex, i.uv23.zw);
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return half4(sum.rgb * 0.125, 1.0);
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}
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v2f_upSample VertUpSample(a2f_default v)
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{
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v2f_upSample o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.texcoord = v.uv;
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#if UNITY_UV_STARTS_AT_TOP
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o.texcoord = o.texcoord * float2(1.0, -1.0) + float2(0.0, 1.0);
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#endif
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float2 uv = TRANSFORM_TEX(o.texcoord, _MainTex);
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_MainTex_TexelSize *= 0.5;
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_Offset = float2(1 + _Offset, 1 + _Offset);
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o.uv01.xy = uv + float2(-_MainTex_TexelSize.x * 2, 0) * _Offset;
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o.uv01.zw = uv + float2(-_MainTex_TexelSize.x, _MainTex_TexelSize.y) * _Offset;
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o.uv23.xy = uv + float2(0, _MainTex_TexelSize.y * 2) * _Offset;
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o.uv23.zw = uv + _MainTex_TexelSize * _Offset;
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o.uv45.xy = uv + float2(_MainTex_TexelSize.x * 2, 0) * _Offset;
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o.uv45.zw = uv + float2(_MainTex_TexelSize.x, -_MainTex_TexelSize.y) * _Offset;
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o.uv67.xy = uv + float2(0, -_MainTex_TexelSize.y * 2) * _Offset;
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o.uv67.zw = uv - _MainTex_TexelSize * _Offset;
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return o;
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}
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half4 FragUpSample(v2f_upSample i): SV_Target
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{
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half4 sum = 0;
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sum += tex2D(_MainTex, i.uv01.xy);
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sum += tex2D(_MainTex, i.uv01.zw) * 2;
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sum += tex2D(_MainTex, i.uv23.xy);
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sum += tex2D(_MainTex, i.uv23.zw) * 2;
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sum += tex2D(_MainTex, i.uv45.xy);
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sum += tex2D(_MainTex, i.uv45.zw) * 2;
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sum += tex2D(_MainTex, i.uv67.xy);
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sum += tex2D(_MainTex, i.uv67.zw) * 2;
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return half4(sum.rgb * 0.0833, 1.0);
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}
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ENDCG
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Cull Off ZWrite Off ZTest Always
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Pass
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{
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CGPROGRAM
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#pragma vertex VertDownSample
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#pragma fragment FragDownSample
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// #pragma enable_d3d11_debug_symbols
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ENDCG
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}
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Pass
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{
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CGPROGRAM
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#pragma vertex VertUpSample
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#pragma fragment FragUpSample
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// #pragma enable_d3d11_debug_symbols
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ENDCG
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}
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}
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}
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