83 lines
3.0 KiB
Plaintext
83 lines
3.0 KiB
Plaintext
Shader "MyShader/GaussianBlur" { // 高斯模糊
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Properties{
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_MainTex("Base (RGB)", 2D) = "white" {} // 主纹理
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_BlurSize("Blur Size", Float) = 1.0 // 模糊尺寸(纹理坐标的偏移量)
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}
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SubShader{
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CGINCLUDE
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#include "UnityCG.cginc"
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sampler2D _MainTex; // 主纹理
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half4 _MainTex_TexelSize; // _MainTex的像素尺寸大小, float4(1/width, 1/height, width, height)
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float _BlurSize; // 模糊尺寸(纹理坐标的偏移量)
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struct v2f {
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float4 pos : SV_POSITION; // 模型空间顶点坐标
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half2 uv[5]: TEXCOORD0; // 5个邻域的纹理坐标
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};
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v2f vertBlurVertical(appdata_img v) { // 垂直模糊顶点着色器
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex); // 模型空间顶点坐标变换到裁剪空间, 等价于: mul(UNITY_MATRIX_MVP, v.vertex)
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half2 uv = v.texcoord;
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o.uv[0] = uv;
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o.uv[1] = uv + float2(0.0, _MainTex_TexelSize.y * 1.0) * _BlurSize;
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o.uv[2] = uv - float2(0.0, _MainTex_TexelSize.y * 1.0) * _BlurSize;
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o.uv[3] = uv + float2(0.0, _MainTex_TexelSize.y * 2.0) * _BlurSize;
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o.uv[4] = uv - float2(0.0, _MainTex_TexelSize.y * 2.0) * _BlurSize;
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return o;
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}
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v2f vertBlurHorizontal(appdata_img v) { // 水平模糊顶点着色器
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex); // 模型空间顶点坐标变换到裁剪空间, 等价于: mul(UNITY_MATRIX_MVP, v.vertex)
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half2 uv = v.texcoord;
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o.uv[0] = uv;
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o.uv[1] = uv + float2(_MainTex_TexelSize.x * 1.0, 0.0) * _BlurSize;
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o.uv[2] = uv - float2(_MainTex_TexelSize.x * 1.0, 0.0) * _BlurSize;
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o.uv[3] = uv + float2(_MainTex_TexelSize.x * 2.0, 0.0) * _BlurSize;
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o.uv[4] = uv - float2(_MainTex_TexelSize.x * 2.0, 0.0) * _BlurSize;
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return o;
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}
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fixed4 fragBlur(v2f i) : SV_Target {
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float weight[3] = {0.4026, 0.2442, 0.0545}; // 大小为5的一维高斯核，实际只需记录3个权值
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fixed3 sum = tex2D(_MainTex, i.uv[0]).rgb * weight[0];
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for (int j = 1; j < 3; j++) {
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sum += tex2D(_MainTex, i.uv[j * 2 - 1]).rgb * weight[j]; // 中心右侧或下侧的纹理*权值
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sum += tex2D(_MainTex, i.uv[j * 2]).rgb * weight[j]; // 中心左侧或上侧的纹理*权值
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}
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return fixed4(sum, 1.0);
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}
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ENDCG
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ZTest Always Cull Off ZWrite Off
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Pass {
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NAME "GAUSSIAN_BLUR_VERTICAL"
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CGPROGRAM
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#pragma vertex vertBlurVertical
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#pragma fragment fragBlur
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ENDCG
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}
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Pass {
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NAME "GAUSSIAN_BLUR_HORIZONTAL"
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CGPROGRAM
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#pragma vertex vertBlurHorizontal
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#pragma fragment fragBlur
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ENDCG
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}
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}
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FallBack "Diffuse"
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} |