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591
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "OpenGLFloatTextureProgram.h"
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23
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24 #include <Core/OrthancException.h>
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25 #include <Core/Images/Image.h>
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26 #include <Core/Images/ImageProcessing.h>
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27
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28
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29 static const char* FRAGMENT_SHADER =
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30 "uniform float u_offset; \n"
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31 "uniform float u_slope; \n"
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32 "uniform float u_windowCenter; \n"
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33 "uniform float u_windowWidth; \n"
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34 "uniform sampler2D u_texture; \n"
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35 "varying vec2 v_texcoord; \n"
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36 "void main() \n"
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37 "{ \n"
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38 " vec4 t = texture2D(u_texture, v_texcoord); \n"
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39 " float v = (t.r * 256.0 + t.g) * 256.0; \n"
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40 " v = v * u_slope + u_offset; \n" // (*)
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41 " float a = u_windowCenter - u_windowWidth; \n"
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42 " float dy = 1.0 / (2.0 * u_windowWidth); \n"
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43 " if (v <= a) \n"
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44 " v = 0.0; \n"
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45 " else \n"
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46 " { \n"
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47 " v = (v - a) * dy; \n"
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48 " if (v >= 1.0) \n"
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49 " v = 1.0; \n"
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50 " } \n"
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51 " gl_FragColor = vec4(v, v, v, 1); \n"
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52 "}";
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53
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54
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55 namespace OrthancStone
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56 {
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57 namespace Internals
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58 {
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59 OpenGLFloatTextureProgram::OpenGLFloatTextureProgram(OpenGL::IOpenGLContext& context) :
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60 program_(context, FRAGMENT_SHADER)
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61 {
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62 }
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63
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64
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65 OpenGLFloatTextureProgram::Data::Data(const Orthanc::ImageAccessor& texture,
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66 bool isLinearInterpolation)
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67 {
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68 if (texture.GetFormat() != Orthanc::PixelFormat_Float32)
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69 {
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70 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
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71 }
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72
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73 float minValue, maxValue;
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74 Orthanc::ImageProcessing::GetMinMaxFloatValue(minValue, maxValue, texture);
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75
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76 offset_ = minValue;
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77
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78 if (LinearAlgebra::IsCloseToZero(maxValue - minValue))
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79 {
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80 slope_ = 1;
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81 }
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82 else
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83 {
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84 slope_ = (maxValue - minValue) / 65536.0f;
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85 assert(!LinearAlgebra::IsCloseToZero(slope_));
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86 }
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87
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88 const unsigned int width = texture.GetWidth();
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89 const unsigned int height = texture.GetHeight();
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90
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91 Orthanc::Image converted(Orthanc::PixelFormat_RGB24, width, height, true);
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92
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93 for (unsigned int y = 0; y < height; y++)
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94 {
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95 const float *p = reinterpret_cast<const float*>(texture.GetConstRow(y));
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96 uint8_t *q = reinterpret_cast<uint8_t*>(converted.GetRow(y));
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97
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98 for (unsigned int x = 0; x < width; x++)
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99 {
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100 /**
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101 * At (*), the floating-point "value" is reconstructed as
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102 * "value = texture * slope + offset".
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103 * <=> texture = (value - offset) / slope
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104 **/
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105
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106 float texture = (*p - offset_) / slope_;
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107 if (texture < 0)
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108 {
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109 texture = 0;
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110 }
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111 else if (texture >= 65535.0f)
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112 {
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113 texture = 65535.0f;
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114 }
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115
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116 uint16_t t = static_cast<uint16_t>(texture);
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117
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118 q[0] = t / 256; // red
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119 q[1] = t % 256; // green
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120 q[2] = 0; // blue is unused
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121
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122 p++;
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123 q += 3;
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124 }
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125 }
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126
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127 texture_.Load(converted, isLinearInterpolation);
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128 }
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129
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130
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131 void OpenGLFloatTextureProgram::Apply(Data& data,
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132 const AffineTransform2D& transform,
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133 float windowCenter,
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134 float windowWidth)
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135 {
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136 OpenGLTextureProgram::Execution execution(program_, data.GetTexture(), transform);
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137
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138 glUniform1f(execution.GetUniformLocation("u_slope"), data.GetSlope());
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139 glUniform1f(execution.GetUniformLocation("u_offset"), data.GetOffset());
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140 glUniform1f(execution.GetUniformLocation("u_windowCenter"), windowCenter);
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141 glUniform1f(execution.GetUniformLocation("u_windowWidth"), windowWidth);
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142
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143 execution.DrawTriangles();
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144 }
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145 }
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146 }
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