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57 lines
1.1 KiB
57 lines
1.1 KiB
3 years ago
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// Colorful FX - Unity Asset
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// Copyright (c) 2015 - Thomas Hourdel
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// http://www.thomashourdel.com
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#ifndef RADIUS
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#define RADIUS 3
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#endif
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#define H3Z half3(0.0, 0.0, 0.0)
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sampler2D _MainTex;
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half2 _PSize;
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inline void loop(int j0, int j1, int i0, int i1, half2 uv, out half3 m, out half3 s)
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{
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for (int j = j0; j <= j1; j++)
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{
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for (int i = i0; i <= i1; i++)
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{
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half3 c = tex2Dlod(_MainTex, half4(uv + half2(i, j) * _PSize, 0.0, 0.0)).rgb;
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m += c;
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s += c * c;
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}
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}
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}
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half4 frag(v2f_img i) : SV_Target
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{
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half3 m[4] = { H3Z, H3Z, H3Z, H3Z };
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half3 s[4] = { H3Z, H3Z, H3Z, H3Z };
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loop(-RADIUS, 0, -RADIUS, 0, i.uv, m[0], s[0]);
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loop(-RADIUS, 0, 0, RADIUS, i.uv, m[1], s[1]);
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loop( 0, RADIUS, 0, RADIUS, i.uv, m[2], s[2]);
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loop( 0, RADIUS, -RADIUS, 0, i.uv, m[3], s[3]);
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half n = half((RADIUS + 1) * (RADIUS + 1));
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half minSigma2 = 1e+2;
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half3 color = H3Z;
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for (int 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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half sigma2 = s[k].r + s[k].g + s[k].b;
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if (sigma2 < minSigma2)
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{
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minSigma2 = sigma2;
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color = m[k];
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}
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}
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return half4(color, 1.0);
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}
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