1/*
2Convection Texture Tools
3Copyright (c) 2018-2019 Eric Lasota
4
5Permission is hereby granted, free of charge, to any person obtaining
6a copy of this software and associated documentation files (the
7"Software"), to deal in the Software without restriction, including
8without limitation the rights to use, copy, modify, merge, publish,
9distribute, sublicense, and/or sell copies of the Software, and to
10permit persons to whom the Software is furnished to do so, subject
11to the following conditions:
12
13The above copyright notice and this permission notice shall be included
14in all copies or substantial portions of the Software.
15
16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
20CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
21TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
22SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23
24-------------------------------------------------------------------------------------
25
26Portions based on DirectX Texture Library (DirectXTex)
27
28Copyright (c) Microsoft Corporation. All rights reserved.
29Licensed under the MIT License.
30
31http://go.microsoft.com/fwlink/?LinkId=248926
32*/
33#include "ConvectionKernels_Config.h"
34
35#if !defined(CVTT_SINGLE_FILE) || defined(CVTT_SINGLE_FILE_IMPL)
36
37#include "ConvectionKernels.h"
38#include "ConvectionKernels_ParallelMath.h"
39
40#include <algorithm>
41
42namespace cvtt
43{
44 namespace Util
45 {
46 // Signed input blocks are converted into unsigned space, with the maximum value being 254
47 void BiasSignedInput(PixelBlockU8 inputNormalized[ParallelMath::ParallelSize], const PixelBlockS8 inputSigned[ParallelMath::ParallelSize])
48 {
49 for (size_t block = 0; block < ParallelMath::ParallelSize; block++)
50 {
51 const PixelBlockS8& inputSignedBlock = inputSigned[block];
52 PixelBlockU8& inputNormalizedBlock = inputNormalized[block];
53
54 for (size_t px = 0; px < 16; px++)
55 {
56 for (size_t ch = 0; ch < 4; ch++)
57 inputNormalizedBlock.m_pixels[px][ch] = static_cast<uint8_t>(std::max<int>(inputSignedBlock.m_pixels[px][ch], -127) + 127);
58 }
59 }
60 }
61
62 void FillWeights(const Options &options, float channelWeights[4])
63 {
64 if (options.flags & Flags::Uniform)
65 channelWeights[0] = channelWeights[1] = channelWeights[2] = channelWeights[3] = 1.0f;
66 else
67 {
68 channelWeights[0] = options.redWeight;
69 channelWeights[1] = options.greenWeight;
70 channelWeights[2] = options.blueWeight;
71 channelWeights[3] = options.alphaWeight;
72 }
73 }
74
75 void ComputeTweakFactors(int tweak, int range, float *outFactors)
76 {
77 int totalUnits = range - 1;
78 int minOutsideUnits = ((tweak >> 1) & 1);
79 int maxOutsideUnits = (tweak & 1);
80 int insideUnits = totalUnits - minOutsideUnits - maxOutsideUnits;
81
82 outFactors[0] = -static_cast<float>(minOutsideUnits) / static_cast<float>(insideUnits);
83 outFactors[1] = static_cast<float>(maxOutsideUnits) / static_cast<float>(insideUnits) + 1.0f;
84 }
85 }
86}
87
88#endif
89