90 lines
1.7 KiB
Plaintext
90 lines
1.7 KiB
Plaintext
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Shader "Custom/Oil Paint" {
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Properties
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{
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_MainTex("Texture", 2D) = "white" {}
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_Radius ("Range", Range(0, 10)) = 5
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}
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SubShader
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{
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Pass
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{
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CGPROGRAM
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#pragma vertex vertex_shader
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#pragma fragment pixel_shader
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sampler2D _MainTex;
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float4 _MainTex_TexelSize;
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int _Radius;
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struct structure
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{
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float4 vertex:SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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structure vertex_shader(float4 vertex:POSITION,float2 uv:TEXCOORD0)
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{
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structure vs;
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vs.vertex = UnityObjectToClipPos(vertex);
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vs.uv = uv;
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return vs;
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}
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struct region
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{
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int x1, y1, x2, y2;
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};
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float4 pixel_shader(structure ps) : SV_Target
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{
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float2 uv = ps.uv;
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float n = float((_Radius + 1) * (_Radius + 1));
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float4 color = tex2D(_MainTex, uv);
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float3 m[4];
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float3 s[4];
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int k;
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for (k = 0; k < 4; ++k)
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{
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m[k] = float3(0, 0, 0);
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s[k] = float3(0, 0, 0);
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}
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region R[4] =
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{
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{-_Radius, -_Radius, 0, 0},
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{ 0, -_Radius, _Radius, 0},
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{ 0, 0, _Radius, _Radius},
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{-_Radius, 0, 0, _Radius}
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};
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for (k = 0; k < 4; ++k)
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{
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for (int j = R[k].y1; j <= R[k].y2; ++j)
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{
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for (int i = R[k].x1; i <= R[k].x2; ++i)
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{
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float3 c = tex2Dlod(_MainTex,float4(uv+(float2(i*_MainTex_TexelSize.x,j*_MainTex_TexelSize.y)),0,0)).rgb;
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m[k] += c;
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s[k] += c * c;
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}
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}
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}
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float min = 1e+2;
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float s2;
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for (k = 0; k < 4; ++k)
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{
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m[k] /= n;
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s[k] = abs(s[k] / n - m[k] * m[k]);
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s2 = s[k].r + s[k].g + s[k].b;
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if (s2 < min)
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{
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min = s2;
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color.rgb = m[k].rgb;
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}
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}
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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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}
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