2025-01-08 20:53:45 +01:00
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2025-01-17 16:50:34 +01:00
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/*
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glslSmartDenoise by Michele Morrone, adapted
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original code: https://github.com/BrutPitt/glslSmartDeNoise
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license of the original code:
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BSD 2-Clause License
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Copyright (c) 2019-2020 Michele Morrone
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2025-01-08 20:53:45 +01:00
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*/
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#define INV_SQRT_OF_2PI 0.39894228040143267793994605993439 // 1.0/SQRT_OF_2PI
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#define INV_PI 0.31830988618379067153776752674503
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vec4 smart_denoise(sampler2D tex, vec2 uv, float sigma, float kSigma, float threshold) {
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float radius = round(kSigma*sigma);
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float radQ = radius * radius;
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float invSigmaQx2 = .5 / (sigma * sigma); // 1.0 / (sigma^2 * 2.0)
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float invSigmaQx2PI = INV_PI * invSigmaQx2; // 1/(2 * PI * sigma^2)
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float invThresholdSqx2 = .5 / (threshold * threshold); // 1.0 / (sigma^2 * 2.0)
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float invThresholdSqrt2PI = INV_SQRT_OF_2PI / threshold; // 1.0 / (sqrt(2*PI) * sigma^2)
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vec4 centrPx = texture(tex,uv);
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float zBuff = 0.0;
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vec4 aBuff = vec4(0.0);
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vec2 size = vec2(textureSize(tex, 0));
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for (float dx = -radius; dx <= radius; dx++) {
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float pt = sqrt(radQ - dx * dx); // pt = yRadius: have circular trend
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for (float dy = -pt; dy <= pt; dy++) {
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vec2 d = vec2(dx, dy);
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float blurFactor = exp( -dot(d, d) * invSigmaQx2 ) * invSigmaQx2PI;
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vec4 walkPx = texture(tex,uv+d/size);
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vec4 dC = walkPx-centrPx;
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float deltaFactor = exp(-dot(dC, dC) * invThresholdSqx2) * invThresholdSqrt2PI * blurFactor;
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zBuff += deltaFactor;
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aBuff += deltaFactor*walkPx;
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}
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}
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return aBuff/zBuff;
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}
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