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diff --git a/thirdparty/cvtt/ConvectionKernels_Util.cpp b/thirdparty/cvtt/ConvectionKernels_Util.cpp
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+++ b/thirdparty/cvtt/ConvectionKernels_Util.cpp
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+/*
+Convection Texture Tools
+Copyright (c) 2018-2019 Eric Lasota
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject
+to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+-------------------------------------------------------------------------------------
+
+Portions based on DirectX Texture Library (DirectXTex)
+
+Copyright (c) Microsoft Corporation. All rights reserved.
+Licensed under the MIT License.
+
+http://go.microsoft.com/fwlink/?LinkId=248926
+*/
+#include "ConvectionKernels_Config.h"
+
+#if !defined(CVTT_SINGLE_FILE) || defined(CVTT_SINGLE_FILE_IMPL)
+
+#include "ConvectionKernels.h"
+#include "ConvectionKernels_ParallelMath.h"
+
+#include <algorithm>
+
+namespace cvtt
+{
+    namespace Util
+    {
+        // Signed input blocks are converted into unsigned space, with the maximum value being 254
+        void BiasSignedInput(PixelBlockU8 inputNormalized[ParallelMath::ParallelSize], const PixelBlockS8 inputSigned[ParallelMath::ParallelSize])
+        {
+            for (size_t block = 0; block < ParallelMath::ParallelSize; block++)
+            {
+                const PixelBlockS8& inputSignedBlock = inputSigned[block];
+                PixelBlockU8& inputNormalizedBlock = inputNormalized[block];
+
+                for (size_t px = 0; px < 16; px++)
+                {
+                    for (size_t ch = 0; ch < 4; ch++)
+                        inputNormalizedBlock.m_pixels[px][ch] = static_cast<uint8_t>(std::max<int>(inputSignedBlock.m_pixels[px][ch], -127) + 127);
+                }
+            }
+        }
+
+        void FillWeights(const Options &options, float channelWeights[4])
+        {
+            if (options.flags & Flags::Uniform)
+                channelWeights[0] = channelWeights[1] = channelWeights[2] = channelWeights[3] = 1.0f;
+            else
+            {
+                channelWeights[0] = options.redWeight;
+                channelWeights[1] = options.greenWeight;
+                channelWeights[2] = options.blueWeight;
+                channelWeights[3] = options.alphaWeight;
+            }
+        }
+
+        void ComputeTweakFactors(int tweak, int range, float *outFactors)
+        {
+            int totalUnits = range - 1;
+            int minOutsideUnits = ((tweak >> 1) & 1);
+            int maxOutsideUnits = (tweak & 1);
+            int insideUnits = totalUnits - minOutsideUnits - maxOutsideUnits;
+
+            outFactors[0] = -static_cast<float>(minOutsideUnits) / static_cast<float>(insideUnits);
+            outFactors[1] = static_cast<float>(maxOutsideUnits) / static_cast<float>(insideUnits) + 1.0f;
+        }
+    }
+}
+
+#endif