67 lines
2.8 KiB
Plaintext
67 lines
2.8 KiB
Plaintext
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// MIT License
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// Copyright (c) 2019-2021 bloc97
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// All rights reserved.
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//!DESC Anime4K-v3.2-Denoise-Bilateral-Mean
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//!HOOK MAIN
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//!BIND HOOKED
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#define INTENSITY_SIGMA 0.1 //Intensity window size, higher is stronger denoise, must be a positive real number
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#define SPATIAL_SIGMA 1.0 //Spatial window size, higher is stronger denoise, must be a positive real number.
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#define INTENSITY_POWER_CURVE 1.0 //Intensity window power curve. Setting it to 0 will make the intensity window treat all intensities equally, while increasing it will make the window narrower in darker intensities and wider in brighter intensities.
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#define KERNELSIZE (max(int(ceil(SPATIAL_SIGMA * 2.0)), 1) * 2 + 1) //Kernel size, must be an positive odd integer.
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#define KERNELHALFSIZE (int(KERNELSIZE/2)) //Half of the kernel size without remainder. Must be equal to trunc(KERNELSIZE/2).
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#define KERNELLEN (KERNELSIZE * KERNELSIZE) //Total area of kernel. Must be equal to KERNELSIZE * KERNELSIZE.
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#define GETOFFSET(i) vec2((i % KERNELSIZE) - KERNELHALFSIZE, (i / KERNELSIZE) - KERNELHALFSIZE)
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vec4 gaussian_vec(vec4 x, vec4 s, vec4 m) {
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vec4 scaled = (x - m) / s;
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return exp(-0.5 * scaled * scaled);
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}
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float gaussian(float x, float s, float m) {
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float scaled = (x - m) / s;
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return exp(-0.5 * scaled * scaled);
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}
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vec4 hook() {
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vec4 sum = vec4(0.0);
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vec4 n = vec4(0.0);
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vec4 vc = HOOKED_tex(HOOKED_pos);
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vec4 is = pow(vc + 0.0001, vec4(INTENSITY_POWER_CURVE)) * INTENSITY_SIGMA;
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float ss = SPATIAL_SIGMA;
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for (int i=0; i<KERNELLEN; i++) {
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vec2 ipos = GETOFFSET(i);
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vec4 v = HOOKED_texOff(ipos);
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vec4 d = gaussian_vec(v, is, vc) * gaussian(length(ipos), ss, 0.0);
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sum += d * v;
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n += d;
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}
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return sum / n;
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}
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