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annotate Framework/Viewport/WebGLViewportsRegistry.cpp @ 1242:b9b5d4378874 broker

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working of WebAssemblyOracle
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 06 Jan 2020 18:08:05 +0100
parents e71ee3e88448
children 0ca50d275b9a
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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 "WebGLViewportsRegistry.h"
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23
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24 #include <Core/OrthancException.h>
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25
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26 #include <boost/make_shared.hpp>
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27
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28 namespace OrthancStone
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29 {
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30 void WebGLViewportsRegistry::LaunchTimer()
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31 {
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32 emscripten_set_timeout(OnTimeoutCallback, timeoutMS_, this);
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33 }
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36 void WebGLViewportsRegistry::OnTimeout()
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37 {
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38 for (Viewports::iterator it = viewports_.begin(); it != viewports_.end(); ++it)
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39 {
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40 if (it->second == NULL ||
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41 it->second->IsContextLost())
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42 {
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43 LOG(INFO) << "WebGL context lost for canvas: " << it->first;
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44
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45 // Try and duplicate the HTML5 canvas in the DOM
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46 EM_ASM({
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47 var canvas = document.getElementById(UTF8ToString($0));
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48 if (canvas) {
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49 var parent = canvas.parentElement;
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50 if (parent) {
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51 var cloned = canvas.cloneNode(true /* deep copy */);
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52 parent.insertBefore(cloned, canvas);
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53 parent.removeChild(canvas);
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54 }
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55 }
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56 },
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57 it->first.c_str() // $0 = ID of the canvas
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58 );
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59
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60 // At this point, the old canvas is removed from the DOM and
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61 // replaced by a fresh one with the same ID: Recreate the
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62 // WebGL context on the new canvas
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63 boost::shared_ptr<WebGLViewport> viewport;
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64
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65 {
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66 std::auto_ptr<IViewport::ILock> lock(it->second->Lock());
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67 viewport = boost::make_shared<WebGLViewport>(it->first, lock->GetController().GetScene());
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68 }
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69
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70 // Replace the old WebGL viewport by the new one
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71 it->second = viewport;
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72
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73 // Tag the fresh canvas as needing a repaint
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74 {
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75 std::auto_ptr<IViewport::ILock> lock(it->second->Lock());
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76 lock->Invalidate();
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77 }
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78 }
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79 }
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80
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81 LaunchTimer();
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82 }
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83
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84
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85 void WebGLViewportsRegistry::OnTimeoutCallback(void *userData)
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86 {
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87 WebGLViewportsRegistry& that = *reinterpret_cast<WebGLViewportsRegistry*>(userData);
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88 that.OnTimeout();
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89 }
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90
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91
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92 WebGLViewportsRegistry::WebGLViewportsRegistry(double timeoutMS) :
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93 timeoutMS_(timeoutMS)
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94 {
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95 if (timeoutMS <= 0)
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96 {
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97 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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98 }
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99
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100 LaunchTimer();
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101 }
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102
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103
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104 boost::shared_ptr<WebGLViewport> WebGLViewportsRegistry::Add(const std::string& canvasId)
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105 {
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106 if (viewports_.find(canvasId) != viewports_.end())
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107 {
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108 LOG(ERROR) << "Canvas was already registered: " << canvasId;
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109 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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110 }
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111 else
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112 {
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113 boost::shared_ptr<WebGLViewport> viewport(new WebGLViewport(canvasId));
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114 viewports_[canvasId] = viewport;
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115 return viewport;
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116 }
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117 }
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118
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119
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120 void WebGLViewportsRegistry::Remove(const std::string& canvasId)
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121 {
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122 Viewports::iterator found = viewports_.find(canvasId);
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123
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124 if (found == viewports_.end())
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125 {
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126 LOG(ERROR) << "Cannot remove unregistered canvas: " << canvasId;
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127 }
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128 else
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129 {
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130 viewports_.erase(found);
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131 }
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132 }
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133
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134
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135 void WebGLViewportsRegistry::Clear()
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136 {
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137 viewports_.clear();
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138 }
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140
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141 WebGLViewportsRegistry::Accessor::Accessor(WebGLViewportsRegistry& that,
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142 const std::string& canvasId) :
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143 that_(that)
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144 {
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145 Viewports::iterator viewport = that.viewports_.find(canvasId);
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146 if (viewport != that.viewports_.end() &&
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147 viewport->second != NULL)
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148 {
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149 lock_.reset(viewport->second->Lock());
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150 }
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151 }
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152
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153
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154 IViewport::ILock& WebGLViewportsRegistry::Accessor::GetViewport() const
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155 {
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156 if (IsValid())
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157 {
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158 return *lock_;
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159 }
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160 else
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161 {
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162 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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163 }
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164 }
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165 }