基于Unity实现油画风格的着色器

基于Unity实现油画风格的着色器

Shader "Custom/OilPaintEffect" { Properties{ _MainTex("MainTex",2D)="white"{} //迭代次数 _Radius("_Radius",Range(0.0,5.0)) = 2.0 //模糊程度 _ResolutionValue("_ResolutionValue",Range(0.0,5.0)) = 1.0 //原始图片宽的像素 _Width("Width",Int) = 0 //原始图片高的像素 _Height("Height", Int) = 0 } SubShader{ Pass{ CGPROGRAM #pragma vertex vert_img #pragma fragment frag #include "UnityCG.cginc" sampler2D _MainTex; int _Radius; float _ResolutionValue; int _Width; int _Height; float4 frag(v2f_img i) :SV_Target{ float2 src_size = float2(_ResolutionValue / _Width,_ResolutionValue / _Height); float2 uv = i.uv; float n = (_Radius + 1)*(_Radius + 1); float3 m0 = 0.0; float3 m1 = 0.0; float3 s0 = 0.0; float3 s1 = 0.0; float3 color = 0.0; for (int j = -_Radius;j <= 0;++j) { for (int k = -_Radius;k <= 0; ++k) { color = tex2D(_MainTex, uv +float2(k,j)*src_size).rgb; m0 += color; s0 += color * color; } } for (int j = 0;j <= _Radius; ++j) { for (int k = 0;k <= _Radius; ++k) { color = tex2D(_MainTex, uv + float2(k, j)*src_size).rgb; m1 += color; s1 += color * color; } } float4 finalColor = 0.0; float min_sigma2 = 100; m0 /= n; s0 = abs(s0 / n - m0 * m0); float sigma2 = s0.r + s0.g + s0.b; if (sigma2 < min_sigma2) { min_sigma2 = sigma2; finalColor = float4(m0, 1.0); } m1 /= n; s1 = abs(s1 / n - m1 * m1); sigma2 = s1.r + s1.g + s1.b; if (sigma2 < min_sigma2) { min_sigma2 = sigma2; finalColor = float4(m1, 1.0); } return finalColor; } ENDCG } }}

使用时子在UI图片上可以看到效果。

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