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annotate Applications/Samples/WebAssembly/RtViewer/RtViewerWasm.cpp @ 1551:c54bc5bffd01

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software rendering
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 13 Aug 2020 22:05:13 +0200
parents 4cfdaf4ef3fe
children 5887a4f8594b
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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) 2017-2020 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 #include "../../Common/RtViewerApp.h"
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22 #include "../../Common/RtViewerView.h"
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23 #include "../../Common/SampleHelpers.h"
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24
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25 // Stone of Orthanc includes
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26 #include "../../../../OrthancStone/Sources/Loaders/WebAssemblyLoadersContext.h"
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27 #include "../../../../OrthancStone/Sources/StoneException.h"
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28 #include "../../../../OrthancStone/Sources/StoneInitialization.h"
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29 #include "../../../../OrthancStone/Sources/Viewport/WebGLViewport.h"
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30 //#include "../../../../OrthancStone/Sources/OpenGL/WebAssemblyOpenGLContext.h"
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31
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32 #include <Toolbox.h>
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33
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34 #include <boost/program_options.hpp>
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35 #include <boost/shared_ptr.hpp>
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36 // #include <boost/pointer_cast.hpp> this include might be necessary in more recent boost versions
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37
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38 #include <emscripten.h>
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39 #include <emscripten/html5.h>
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41
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42 #define DISPATCH_JAVASCRIPT_EVENT(name) \
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43 EM_ASM( \
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44 const customEvent = document.createEvent("CustomEvent"); \
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45 customEvent.initCustomEvent(name, false, false, undefined); \
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46 window.dispatchEvent(customEvent); \
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47 );
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48
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49 #define EXTERN_CATCH_EXCEPTIONS \
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50 catch (Orthanc::OrthancException& e) \
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51 { \
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52 LOG(ERROR) << "OrthancException: " << e.What(); \
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53 DISPATCH_JAVASCRIPT_EVENT("StoneException"); \
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54 } \
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55 catch (OrthancStone::StoneException& e) \
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56 { \
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57 LOG(ERROR) << "StoneException: " << e.What(); \
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58 DISPATCH_JAVASCRIPT_EVENT("StoneException"); \
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59 } \
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60 catch (std::exception& e) \
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61 { \
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62 LOG(ERROR) << "Runtime error: " << e.what(); \
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63 DISPATCH_JAVASCRIPT_EVENT("StoneException"); \
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64 } \
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65 catch (...) \
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66 { \
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67 LOG(ERROR) << "Native exception"; \
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68 DISPATCH_JAVASCRIPT_EVENT("StoneException"); \
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69 }
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70
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71 namespace OrthancStone
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72 {
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73 // typedef EM_BOOL (*OnMouseWheelFunc)(int eventType, const EmscriptenWheelEvent* wheelEvent, void* userData);
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74
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75 EM_BOOL RtViewerView_Scroll(int eventType,
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76 const EmscriptenWheelEvent* wheelEvent,
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77 void* userData)
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78 {
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79 RtViewerView* that = reinterpret_cast<RtViewerView*>(userData);
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80
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81 int delta = 0;
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82 if (wheelEvent->deltaY < 0)
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83 delta = -1;
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84 if (wheelEvent->deltaY > 0)
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85 delta = 1;
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86
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87 that->Scroll(delta);
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88
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89 return 1;
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90 }
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91
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92 boost::shared_ptr<IViewport> RtViewerView::CreateViewport(
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93 const std::string& canvasId)
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94 {
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95 boost::shared_ptr<IViewport> viewport = WebGLViewport::Create(canvasId);
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96
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97 void* userData = reinterpret_cast<void*>(this);
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98
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99 // manually add the mouse wheel handler
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100
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101 std::string selector = "#" + canvasId;
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102
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103 emscripten_set_wheel_callback_on_thread(
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104 selector.c_str(),
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105 userData,
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106 false,
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107 &RtViewerView_Scroll,
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108 EM_CALLBACK_THREAD_CONTEXT_CALLING_THREAD);
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109
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110 return viewport;
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111 }
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112
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113 void RtViewerView::TakeScreenshot(const std::string& target,
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114 unsigned int canvasWidth,
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115 unsigned int canvasHeight)
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116 {
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117 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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118 }
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119
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120
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121 void RtViewerApp::RunWasm()
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122 {
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123 loadersContext_.reset(new OrthancStone::WebAssemblyLoadersContext(1, 4, 1));
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124
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125 // we are in WASM --> downcast to concrete type
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126 boost::shared_ptr<WebAssemblyLoadersContext> loadersContext =
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127 boost::dynamic_pointer_cast<WebAssemblyLoadersContext>(loadersContext_);
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128
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129 if (HasArgument("orthanc"))
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130 loadersContext->SetLocalOrthanc(GetArgument("orthanc"));
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131 else
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132 loadersContext->SetLocalOrthanc("..");
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133
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134 loadersContext->SetDicomCacheSize(128 * 1024 * 1024); // 128MB
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135
1404
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136 CreateLoaders();
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137
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138 CreateView("RtViewer_Axial", VolumeProjection_Axial);
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139 CreateView("RtViewer_Coronal", VolumeProjection_Coronal);
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140 CreateView("RtViewer_Sagittal", VolumeProjection_Sagittal);
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141
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142 for (size_t i = 0; i < views_.size(); ++i)
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143 {
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144 views_[i]->PrepareViewport();
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145 }
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146
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147 StartLoaders();
1393
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148 }
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149 }
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150
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151 extern "C"
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152 {
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153 boost::shared_ptr<OrthancStone::RtViewerApp> g_app;
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154
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155 int main(int argc, char const *argv[])
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156 {
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157 try
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158 {
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159 OrthancStone::StoneInitialize();
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160 Orthanc::Logging::Initialize();
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161 Orthanc::Logging::EnableTraceLevel(true);
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162
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163 LOG(WARNING) << "Initializing native Stone";
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164
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165 LOG(WARNING) << "Compiled with Emscripten " << __EMSCRIPTEN_major__
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166 << "." << __EMSCRIPTEN_minor__
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167 << "." << __EMSCRIPTEN_tiny__;
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168
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169 LOG(INFO) << "Endianness: " << Orthanc::EnumerationToString(Orthanc::Toolbox::DetectEndianness());
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170
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171 g_app = OrthancStone::RtViewerApp::Create();
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172
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173 DISPATCH_JAVASCRIPT_EVENT("WasmModuleInitialized");
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174 }
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175 EXTERN_CATCH_EXCEPTIONS;
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176 }
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177
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178 EMSCRIPTEN_KEEPALIVE
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179 void Initialize(const char* canvasId)
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180 {
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181 try
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182 {
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183 g_app->RunWasm();
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184 }
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185 EXTERN_CATCH_EXCEPTIONS;
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186 }
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187
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188 EMSCRIPTEN_KEEPALIVE
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189 void SetArgument(const char* key, const char* value)
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190 {
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191 // This is called for each GET argument (cf. "app.js")
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192 LOG(INFO) << "Received GET argument: [" << key << "] = [" << value << "]";
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193 g_app->SetArgument(key, value);
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194 }
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195
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196 }