Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/Internals/OpenGLFloatTextureProgram.cpp @ 1556:8898f8f755c8
typo
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 18 Aug 2020 11:58:47 +0200 |
| parents | 244ad1e4e76a |
| children | 85e117739eca |
| rev | line source |
|---|---|
| 591 | 1 /** |
| 2 * Stone of Orthanc | |
| 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
| 4 * Department, University Hospital of Liege, Belgium | |
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium |
| 591 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
| 8 * modify it under the terms of the GNU Affero General Public License | |
| 9 * as published by the Free Software Foundation, either version 3 of | |
| 10 * the License, or (at your option) any later version. | |
| 11 * | |
| 12 * This program is distributed in the hope that it will be useful, but | |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 * Affero General Public License for more details. | |
| 16 * | |
| 17 * You should have received a copy of the GNU Affero General Public License | |
| 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 **/ | |
| 20 | |
| 21 | |
| 22 #include "OpenGLFloatTextureProgram.h" | |
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23 #include "OpenGLShaderVersionDirective.h" |
| 591 | 24 |
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25 #include <OrthancException.h> |
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26 #include <Images/Image.h> |
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27 #include <Images/ImageProcessing.h> |
| 591 | 28 |
| 29 | |
| 30 static const char* FRAGMENT_SHADER = | |
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31 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE |
| 771 | 32 "uniform float u_offset; \n" |
| 33 "uniform float u_slope; \n" | |
| 34 "uniform float u_windowCenter; \n" | |
| 35 "uniform float u_windowWidth; \n" | |
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36 "uniform bool u_invert; \n" |
| 771 | 37 "uniform sampler2D u_texture; \n" |
| 38 "varying vec2 v_texcoord; \n" | |
| 39 "void main() \n" | |
| 40 "{ \n" | |
| 41 " vec4 t = texture2D(u_texture, v_texcoord); \n" | |
| 42 " float v = (t.r * 256.0 + t.g) * 256.0; \n" | |
| 43 " v = v * u_slope + u_offset; \n" // (*) | |
| 44 " float a = u_windowCenter - u_windowWidth / 2.0; \n" | |
| 45 " float dy = 1.0 / u_windowWidth; \n" | |
| 46 " if (v <= a) \n" | |
| 47 " v = 0.0; \n" | |
| 48 " else \n" | |
| 49 " { \n" | |
| 50 " v = (v - a) * dy; \n" | |
| 51 " if (v >= 1.0) \n" | |
| 52 " v = 1.0; \n" | |
| 53 " } \n" | |
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54 " if (u_invert) \n" |
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55 " v = 1.0 - v; \n" |
| 771 | 56 " gl_FragColor = vec4(v, v, v, 1); \n" |
| 591 | 57 "}"; |
| 58 | |
| 59 | |
| 60 namespace OrthancStone | |
| 61 { | |
| 62 namespace Internals | |
| 63 { | |
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64 OpenGLFloatTextureProgram::Data::Data( |
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65 OpenGL::IOpenGLContext& context |
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66 , const Orthanc::ImageAccessor& texture |
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67 , bool isLinearInterpolation) |
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68 : texture_(context) |
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69 , offset_(0.0f) |
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70 , slope_(0.0f) |
| 591 | 71 { |
| 72 if (texture.GetFormat() != Orthanc::PixelFormat_Float32) | |
| 73 { | |
| 74 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat); | |
| 75 } | |
| 76 | |
| 77 float minValue, maxValue; | |
| 78 Orthanc::ImageProcessing::GetMinMaxFloatValue(minValue, maxValue, texture); | |
| 79 | |
| 80 offset_ = minValue; | |
| 81 | |
| 82 if (LinearAlgebra::IsCloseToZero(maxValue - minValue)) | |
| 83 { | |
| 84 slope_ = 1; | |
| 85 } | |
| 86 else | |
| 87 { | |
| 88 slope_ = (maxValue - minValue) / 65536.0f; | |
| 89 assert(!LinearAlgebra::IsCloseToZero(slope_)); | |
| 90 } | |
| 91 | |
| 92 const unsigned int width = texture.GetWidth(); | |
| 93 const unsigned int height = texture.GetHeight(); | |
| 94 | |
| 95 Orthanc::Image converted(Orthanc::PixelFormat_RGB24, width, height, true); | |
| 96 | |
| 97 for (unsigned int y = 0; y < height; y++) | |
| 98 { | |
| 99 const float *p = reinterpret_cast<const float*>(texture.GetConstRow(y)); | |
| 100 uint8_t *q = reinterpret_cast<uint8_t*>(converted.GetRow(y)); | |
| 101 | |
| 102 for (unsigned int x = 0; x < width; x++) | |
| 103 { | |
| 104 /** | |
| 105 * At (*), the floating-point "value" is reconstructed as | |
| 106 * "value = texture * slope + offset". | |
| 107 * <=> texture = (value - offset) / slope | |
| 108 **/ | |
| 109 | |
| 110 float texture = (*p - offset_) / slope_; | |
| 111 if (texture < 0) | |
| 112 { | |
| 113 texture = 0; | |
| 114 } | |
| 115 else if (texture >= 65535.0f) | |
| 116 { | |
| 117 texture = 65535.0f; | |
| 118 } | |
| 119 | |
| 120 uint16_t t = static_cast<uint16_t>(texture); | |
| 121 | |
| 122 q[0] = t / 256; // red | |
| 123 q[1] = t % 256; // green | |
| 124 q[2] = 0; // blue is unused | |
| 125 | |
| 126 p++; | |
| 127 q += 3; | |
| 128 } | |
| 129 } | |
| 130 | |
| 131 texture_.Load(converted, isLinearInterpolation); | |
| 132 } | |
| 133 | |
| 134 | |
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135 OpenGLFloatTextureProgram::OpenGLFloatTextureProgram(OpenGL::IOpenGLContext& context) |
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136 : program_(context, FRAGMENT_SHADER) |
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137 , context_(context) |
| 592 | 138 { |
| 139 } | |
| 140 | |
| 141 | |
| 591 | 142 void OpenGLFloatTextureProgram::Apply(Data& data, |
| 143 const AffineTransform2D& transform, | |
| 144 float windowCenter, | |
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145 float windowWidth, |
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146 bool invert) |
| 591 | 147 { |
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148 if (!context_.IsContextLost()) |
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149 { |
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150 OpenGLTextureProgram::Execution execution(program_, data.GetTexture(), transform); |
| 591 | 151 |
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152 glUniform1f(execution.GetUniformLocation("u_slope"), data.GetSlope()); |
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153 glUniform1f(execution.GetUniformLocation("u_offset"), data.GetOffset()); |
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154 glUniform1f(execution.GetUniformLocation("u_windowCenter"), windowCenter); |
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155 glUniform1f(execution.GetUniformLocation("u_windowWidth"), windowWidth); |
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156 glUniform1f(execution.GetUniformLocation("u_invert"), invert); |
| 591 | 157 |
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158 execution.DrawTriangles(); |
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159 } |
| 591 | 160 } |
| 161 } | |
| 162 } |