Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/Internals/OpenGLFloatTextureProgram.cpp @ 1871:7053b8a0aaec
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 11 Jan 2022 11:18:48 +0100 |
| parents | 3889ae96d2e9 |
| children | ee68ee732aa7 |
| rev | line source |
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| 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) 2017-2022 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
| 591 | 7 * |
| 8 * This program is free software: you can redistribute it and/or | |
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9 * modify it under the terms of the GNU Lesser General Public License |
| 591 | 10 * as published by the Free Software Foundation, either version 3 of |
| 11 * the License, or (at your option) any later version. | |
| 12 * | |
| 13 * This program is distributed in the hope that it will be useful, but | |
| 14 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 * Lesser General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU Lesser General Public |
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19 * License along with this program. If not, see |
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20 * <http://www.gnu.org/licenses/>. |
| 591 | 21 **/ |
| 22 | |
| 23 | |
| 24 #include "OpenGLFloatTextureProgram.h" | |
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25 #include "OpenGLShaderVersionDirective.h" |
| 591 | 26 |
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27 #include <OrthancException.h> |
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28 #include <Images/Image.h> |
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29 #include <Images/ImageProcessing.h> |
| 591 | 30 |
| 31 | |
| 32 static const char* FRAGMENT_SHADER = | |
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33 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE |
| 771 | 34 "uniform float u_offset; \n" |
| 35 "uniform float u_slope; \n" | |
| 36 "uniform float u_windowCenter; \n" | |
| 37 "uniform float u_windowWidth; \n" | |
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38 "uniform bool u_invert; \n" |
| 771 | 39 "uniform sampler2D u_texture; \n" |
| 40 "varying vec2 v_texcoord; \n" | |
| 41 "void main() \n" | |
| 42 "{ \n" | |
| 43 " vec4 t = texture2D(u_texture, v_texcoord); \n" | |
| 44 " float v = (t.r * 256.0 + t.g) * 256.0; \n" | |
| 45 " v = v * u_slope + u_offset; \n" // (*) | |
| 46 " float a = u_windowCenter - u_windowWidth / 2.0; \n" | |
| 47 " float dy = 1.0 / u_windowWidth; \n" | |
| 48 " if (v <= a) \n" | |
| 49 " v = 0.0; \n" | |
| 50 " else \n" | |
| 51 " { \n" | |
| 52 " v = (v - a) * dy; \n" | |
| 53 " if (v >= 1.0) \n" | |
| 54 " v = 1.0; \n" | |
| 55 " } \n" | |
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56 " if (u_invert) \n" |
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57 " v = 1.0 - v; \n" |
| 771 | 58 " gl_FragColor = vec4(v, v, v, 1); \n" |
| 591 | 59 "}"; |
| 60 | |
| 61 | |
| 62 namespace OrthancStone | |
| 63 { | |
| 64 namespace Internals | |
| 65 { | |
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66 OpenGLFloatTextureProgram::Data::Data( |
| 1571 | 67 OpenGL::IOpenGLContext& context, |
| 68 const Orthanc::ImageAccessor& texture, | |
| 69 bool isLinearInterpolation) : | |
| 70 texture_(context), | |
| 71 offset_(0.0f), | |
| 72 slope_(0.0f) | |
| 591 | 73 { |
| 74 if (texture.GetFormat() != Orthanc::PixelFormat_Float32) | |
| 75 { | |
| 76 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat); | |
| 77 } | |
| 78 | |
| 79 float minValue, maxValue; | |
| 80 Orthanc::ImageProcessing::GetMinMaxFloatValue(minValue, maxValue, texture); | |
| 81 | |
| 82 offset_ = minValue; | |
| 83 | |
| 84 if (LinearAlgebra::IsCloseToZero(maxValue - minValue)) | |
| 85 { | |
| 86 slope_ = 1; | |
| 87 } | |
| 88 else | |
| 89 { | |
| 90 slope_ = (maxValue - minValue) / 65536.0f; | |
| 91 assert(!LinearAlgebra::IsCloseToZero(slope_)); | |
| 92 } | |
| 93 | |
| 94 const unsigned int width = texture.GetWidth(); | |
| 95 const unsigned int height = texture.GetHeight(); | |
| 96 | |
| 97 Orthanc::Image converted(Orthanc::PixelFormat_RGB24, width, height, true); | |
| 98 | |
| 99 for (unsigned int y = 0; y < height; y++) | |
| 100 { | |
| 101 const float *p = reinterpret_cast<const float*>(texture.GetConstRow(y)); | |
| 102 uint8_t *q = reinterpret_cast<uint8_t*>(converted.GetRow(y)); | |
| 103 | |
| 104 for (unsigned int x = 0; x < width; x++) | |
| 105 { | |
| 106 /** | |
| 107 * At (*), the floating-point "value" is reconstructed as | |
| 108 * "value = texture * slope + offset". | |
| 109 * <=> texture = (value - offset) / slope | |
| 110 **/ | |
| 111 | |
| 1571 | 112 float value = (*p - offset_) / slope_; |
| 113 if (value < 0) | |
| 591 | 114 { |
| 1571 | 115 value = 0; |
| 591 | 116 } |
| 1571 | 117 else if (value >= 65535.0f) |
| 591 | 118 { |
| 1571 | 119 value = 65535.0f; |
| 591 | 120 } |
| 121 | |
| 1571 | 122 uint16_t t = static_cast<uint16_t>(value); |
| 591 | 123 |
| 124 q[0] = t / 256; // red | |
| 125 q[1] = t % 256; // green | |
| 126 q[2] = 0; // blue is unused | |
| 127 | |
| 128 p++; | |
| 129 q += 3; | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 texture_.Load(converted, isLinearInterpolation); | |
| 134 } | |
| 135 | |
| 136 | |
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137 OpenGLFloatTextureProgram::OpenGLFloatTextureProgram(OpenGL::IOpenGLContext& context) |
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138 : program_(context, FRAGMENT_SHADER) |
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139 , context_(context) |
| 592 | 140 { |
| 141 } | |
| 142 | |
| 143 | |
| 591 | 144 void OpenGLFloatTextureProgram::Apply(Data& data, |
| 145 const AffineTransform2D& transform, | |
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146 unsigned int canvasWidth, |
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147 unsigned int canvasHeight, |
| 591 | 148 float windowCenter, |
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149 float windowWidth, |
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150 bool invert) |
| 591 | 151 { |
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152 if (!context_.IsContextLost()) |
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153 { |
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154 OpenGLTextureProgram::Execution execution( |
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155 program_, data.GetTexture(), transform, canvasWidth, canvasHeight); |
| 591 | 156 |
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157 glUniform1f(execution.GetUniformLocation("u_slope"), data.GetSlope()); |
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158 glUniform1f(execution.GetUniformLocation("u_offset"), data.GetOffset()); |
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159 glUniform1f(execution.GetUniformLocation("u_windowCenter"), windowCenter); |
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160 glUniform1f(execution.GetUniformLocation("u_windowWidth"), windowWidth); |
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161 glUniform1f(execution.GetUniformLocation("u_invert"), invert); |
| 591 | 162 |
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163 execution.DrawTriangles(); |
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164 } |
| 591 | 165 } |
| 166 } | |
| 167 } |