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annotate OrthancStone/Sources/OpenGL/OpenGLTexture.cpp @ 2124:16c01cc201e7

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updated copyright, as Osimis is not active on Orthanc anymore
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 30 May 2024 17:00:29 +0200
parents c23eef785569
children 2e050ec85379
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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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
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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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/>.
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21 **/
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22
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23
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24 #include "OpenGLTexture.h"
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25 #include "IOpenGLContext.h"
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26
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27 #include <Logging.h>
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28 #include <OrthancException.h>
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29
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30 #include <cassert>
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31
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32 namespace OrthancStone
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33 {
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34 namespace OpenGL
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35 {
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36 OpenGLTexture::OpenGLTexture(OpenGL::IOpenGLContext& context)
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37 : width_(0)
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38 , height_(0)
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39 , context_(context)
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40 {
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41 if (!context_.IsContextLost())
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42 {
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43 // Generate a texture object
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44 glGenTextures(1, &texture_);
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45 if (texture_ == 0)
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46 {
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47 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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48 "Cannot create an OpenGL program");
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49 }
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50 }
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51 }
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52
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53 OpenGLTexture::~OpenGLTexture()
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54 {
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55 try
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56 {
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57 if (!context_.IsContextLost())
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58 {
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59 assert(texture_ != 0);
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60 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("About to call glDeleteTextures");
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61 glDeleteTextures(1, &texture_);
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62 }
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63 }
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64 catch (const Orthanc::OrthancException& e)
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65 {
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66 if (e.HasDetails())
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67 {
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68 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What() << " Details: " << e.GetDetails();
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69 }
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70 else
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71 {
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72 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What();
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73 }
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74 }
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75 catch (const std::exception& e)
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76 {
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77 LOG(ERROR) << "std::exception in ~OpenGLTexture: " << e.what();
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78 }
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79 catch (...)
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80 {
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81 LOG(ERROR) << "Unknown exception in ~OpenGLTexture";
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82 }
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83 }
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84
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85 void OpenGLTexture::Load(const Orthanc::ImageAccessor& image,
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86 bool isLinearInterpolation)
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87 {
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88 if (!context_.IsContextLost())
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89 {
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90 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Disable byte-alignment restriction
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91
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92 if (image.GetPitch() != image.GetBytesPerPixel() * image.GetWidth())
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93 {
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94 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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95 "Unsupported non-zero padding");
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96 }
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97
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98 // Bind it
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99 glActiveTexture(GL_TEXTURE0);
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100 glBindTexture(GL_TEXTURE_2D, texture_);
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101
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102 GLenum sourceFormat, internalFormat;
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103
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104 switch (image.GetFormat())
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105 {
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106 case Orthanc::PixelFormat_Grayscale8:
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107 sourceFormat = GL_RED;
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108 internalFormat = GL_RED;
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109 break;
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110
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111 case Orthanc::PixelFormat_RGB24:
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112 sourceFormat = GL_RGB;
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113 internalFormat = GL_RGB;
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114 break;
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115
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116 case Orthanc::PixelFormat_RGBA32:
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117 sourceFormat = GL_RGBA;
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118 internalFormat = GL_RGBA;
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119 break;
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120
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121 default:
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122 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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123 "No support for this format in OpenGL textures: " +
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124 std::string(EnumerationToString(image.GetFormat())));
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125 }
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126
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127 width_ = image.GetWidth();
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128 height_ = image.GetHeight();
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129
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130 GLint interpolation = (isLinearInterpolation ? GL_LINEAR : GL_NEAREST);
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131
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132 // Load the texture from the image buffer
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133 glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, image.GetWidth(), image.GetHeight(),
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134 0, sourceFormat, GL_UNSIGNED_BYTE, image.GetConstBuffer());
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135 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, interpolation);
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136 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, interpolation);
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137 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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138 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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139 }
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140 }
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141
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142
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143 void OpenGLTexture::Bind(GLint location)
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144 {
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145 glActiveTexture(GL_TEXTURE0);
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146 glBindTexture(GL_TEXTURE_2D, texture_);
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147 glUniform1i(location, 0 /* texture unit */);
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148 }
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149 }
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150 }