Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Platforms/WebAssembly/WebGLViewportsRegistry.cpp @ 1928:c73e696967b0 StoneWebViewer-2.3

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StoneWebViewer-2.3
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 24 Mar 2022 09:08:51 +0100
parents 184b0aeae1af
children 07964689cb0b
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 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 "WebGLViewportsRegistry.h"
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25
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26 #include "../../Scene2DViewport/ViewportController.h"
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27 #include "../../Toolbox/GenericToolbox.h"
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28
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29 #include <OrthancException.h>
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30
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31 #include <boost/make_shared.hpp>
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32
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33
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34 static double viewportsTimeout_ = 1000;
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35 static std::unique_ptr<OrthancStone::WebGLViewportsRegistry> globalRegistry_;
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36
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37
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38 namespace OrthancStone
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39 {
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40 void WebGLViewportsRegistry::LaunchTimer()
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41 {
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42 timeOutID_ = emscripten_set_timeout(
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43 OnTimeoutCallback,
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44 timeoutMS_,
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45 reinterpret_cast<void*>(this));
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46 }
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47
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48 void WebGLViewportsRegistry::OnTimeout()
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49 {
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50 for (Viewports::iterator it = viewports_.begin();
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51 it != viewports_.end();
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52 ++it)
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53 {
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54 if (it->second == NULL ||
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55 it->second->IsContextLost())
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56 {
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57 LOG(INFO) << "WebGL context lost for canvas: " << it->first;
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58
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59 // Try and duplicate the HTML5 canvas in the DOM
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60 EM_ASM({
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61 var canvas = document.getElementById(UTF8ToString($0));
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62 if (canvas) {
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63 var parent = canvas.parentElement;
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64 if (parent) {
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65 var cloned = canvas.cloneNode(true /* deep copy */);
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66 parent.insertBefore(cloned, canvas);
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67 parent.removeChild(canvas);
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68 }
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69 }
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70 },
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71 it->first.c_str() // $0 = ID of the canvas
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72 );
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73
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74 // At this point, the old canvas is removed from the DOM and
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75 // replaced by a fresh one with the same ID: Recreate the
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76 // WebGL context on the new canvas
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77 boost::shared_ptr<WebGLViewport> viewport;
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78
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79 // we need to steal the properties from the old viewport
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80 // and set them to the new viewport
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81 {
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82 std::unique_ptr<IViewport::ILock> lock(it->second->Lock());
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83
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84 // TODO: remove ViewportController
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85 Scene2D* scene = lock->GetController().ReleaseScene();
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86 viewport = WebGLViewport::Create(it->first);
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87
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88 {
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89 std::unique_ptr<IViewport::ILock> newLock(viewport->Lock());
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90 newLock->GetController().AcquireScene(scene);
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91 }
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92 }
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93
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94 // Replace the old WebGL viewport by the new one
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95 it->second = viewport;
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96
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97 // Tag the fresh canvas as needing a repaint
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98 {
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99 std::unique_ptr<IViewport::ILock> lock(it->second->Lock());
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100 lock->Invalidate();
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101 }
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102 }
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103 }
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104
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105 LaunchTimer();
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106 }
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107
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108 void WebGLViewportsRegistry::OnTimeoutCallback(void *userData)
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109 {
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110 // This object dies with the process or tab.
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111 WebGLViewportsRegistry* that =
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112 reinterpret_cast<WebGLViewportsRegistry*>(userData);
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113 that->OnTimeout();
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114 }
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115
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116 WebGLViewportsRegistry::WebGLViewportsRegistry(double timeoutMS) :
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117 timeoutMS_(timeoutMS),
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118 timeOutID_(0)
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119 {
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120 if (timeoutMS <= 0)
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121 {
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122 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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123 }
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124
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125 LaunchTimer();
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126 }
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127
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128 WebGLViewportsRegistry::~WebGLViewportsRegistry()
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129 {
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130 emscripten_clear_timeout(timeOutID_);
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131 Clear();
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132 }
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133
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134 boost::shared_ptr<WebGLViewport> WebGLViewportsRegistry::Add(
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135 const std::string& canvasId)
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136 {
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137 if (viewports_.find(canvasId) != viewports_.end())
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138 {
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139 LOG(ERROR) << "Canvas was already registered: " << canvasId;
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140 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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141 }
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142 else
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143 {
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144 boost::shared_ptr<WebGLViewport> viewport =
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145 WebGLViewport::Create(canvasId);
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146 viewports_[canvasId] = viewport;
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147 return viewport;
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148 }
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149 }
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150
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151 void WebGLViewportsRegistry::Remove(const std::string& canvasId)
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152 {
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153 Viewports::iterator found = viewports_.find(canvasId);
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154
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155 if (found == viewports_.end())
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156 {
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157 LOG(ERROR) << "Cannot remove unregistered canvas: " << canvasId;
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158 }
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159 else
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160 {
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161 viewports_.erase(found);
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162 }
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163 }
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164
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165 void WebGLViewportsRegistry::Clear()
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166 {
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167 viewports_.clear();
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168 }
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169
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170 WebGLViewportsRegistry::Accessor::Accessor(WebGLViewportsRegistry& that,
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171 const std::string& canvasId) :
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172 that_(that)
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173 {
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174 Viewports::iterator viewport = that.viewports_.find(canvasId);
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175 if (viewport != that.viewports_.end() &&
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176 viewport->second != NULL)
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177 {
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178 lock_.reset(viewport->second->Lock());
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179 }
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180 }
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181
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182 IViewport::ILock& WebGLViewportsRegistry::Accessor::GetViewport() const
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183 {
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184 if (IsValid())
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185 {
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186 return *lock_;
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187 }
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188 else
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189 {
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190 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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191 }
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192 }
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193
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194
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195 void WebGLViewportsRegistry::FinalizeGlobalRegistry()
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196 {
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197 globalRegistry_.reset();
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198 }
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199
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200
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201 void WebGLViewportsRegistry::SetGlobalRegistryTimeout(double timeout)
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202 {
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203 if (globalRegistry_.get())
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204 {
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205 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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206 }
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207 else
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208 {
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209 viewportsTimeout_ = timeout;
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210 }
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211 }
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212
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213
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214 WebGLViewportsRegistry& WebGLViewportsRegistry::GetGlobalRegistry()
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215 {
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216 if (globalRegistry_.get() == NULL)
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217 {
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218 globalRegistry_.reset(new WebGLViewportsRegistry(viewportsTimeout_));
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219 }
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220
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221 return *globalRegistry_;
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222 }
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223 }