Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Platforms/WebAssembly/WebAssemblyOpenGLContext.cpp @ 2039:e0906b7c67b9 deep-learning
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Sat, 28 Jan 2023 15:48:01 +0100 |
parents | 184b0aeae1af |
children | e5c812a36746 07964689cb0b |
rev | line source |
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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 "WebAssemblyOpenGLContext.h" |
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25 |
1901 | 26 #include "../../StoneException.h" |
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27 |
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28 #include <Logging.h> |
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29 #include <OrthancException.h> |
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30 |
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31 #include <emscripten/html5.h> |
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32 #include <emscripten/em_asm.h> |
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33 |
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34 #include <boost/math/special_functions/round.hpp> |
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35 |
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36 namespace OrthancStone |
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37 { |
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38 namespace OpenGL |
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39 { |
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40 class WebAssemblyOpenGLContext::PImpl |
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41 { |
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42 private: |
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43 std::string canvasSelector_; |
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44 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_; |
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45 bool isContextLost_; |
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46 |
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47 public: |
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48 explicit PImpl(const std::string& canvasSelector) : |
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49 canvasSelector_(canvasSelector), |
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50 isContextLost_(false) |
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51 { |
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52 // Context configuration |
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53 EmscriptenWebGLContextAttributes attr; |
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54 emscripten_webgl_init_context_attributes(&attr); |
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55 |
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56 // The next line might be necessary to print using |
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57 // WebGL. Sometimes, if set to "false" (the default value), |
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58 // the canvas was rendered as a fully white or black |
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59 // area. UNCONFIRMED. |
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60 attr.preserveDrawingBuffer = true; |
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61 |
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62 context_ = emscripten_webgl_create_context(canvasSelector.c_str(), &attr); |
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63 if (context_ == 0) |
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64 { |
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65 std::string message("Cannot create an OpenGL context for the element with the following CSS selector: \""); |
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66 message += canvasSelector; |
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67 message += "\" Please make sure the -s DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=1 flag has been passed to Emscripten when building."; |
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68 LOG(ERROR) << message; |
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69 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message); |
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70 } |
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71 } |
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72 |
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73 void* DebugGetInternalContext() const |
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74 { |
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75 return reinterpret_cast<void*>(context_); |
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76 } |
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77 |
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78 bool IsContextLost() |
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79 { |
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80 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec; |
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81 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0); |
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82 isContextLost_ = apiFlag; |
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83 return isContextLost_; |
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84 } |
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85 |
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86 void SetLostContext() |
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87 { |
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88 isContextLost_ = true; |
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89 } |
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90 |
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91 ~PImpl() |
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92 { |
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93 try |
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94 { |
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95 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_); |
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96 if (result != EMSCRIPTEN_RESULT_SUCCESS) |
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97 { |
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98 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result; |
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99 } |
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100 } |
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101 catch (const Orthanc::OrthancException& e) |
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102 { |
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103 if (e.HasDetails()) |
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104 { |
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105 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails(); |
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106 } |
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107 else |
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108 { |
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109 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What(); |
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110 } |
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111 } |
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112 catch (const std::exception& e) |
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113 { |
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114 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what(); |
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115 } |
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116 catch (...) |
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117 { |
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118 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl"; |
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119 } |
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120 } |
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121 |
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122 const std::string& GetCanvasSelector() const |
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123 { |
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124 return canvasSelector_; |
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125 } |
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126 |
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127 void MakeCurrent() |
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128 { |
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129 if (IsContextLost()) |
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130 { |
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131 LOG(ERROR) << "MakeCurrent() called on lost context " << context_; |
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132 throw StoneException(ErrorCode_WebGLContextLost); |
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133 } |
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134 |
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135 if (emscripten_is_webgl_context_lost(context_)) |
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136 { |
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137 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_; |
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138 SetLostContext(); |
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139 throw StoneException(ErrorCode_WebGLContextLost); |
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140 } |
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141 |
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142 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS) |
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143 { |
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144 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, |
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145 "Cannot set the OpenGL context"); |
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146 } |
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147 } |
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148 |
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149 void SwapBuffer() |
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150 { |
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151 /** |
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152 * "Rendered WebGL content is implicitly presented (displayed to |
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153 * the user) on the canvas when the event handler that renders with |
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154 * WebGL returns back to the browser event loop." |
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155 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context |
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156 * |
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157 * Could call "emscripten_webgl_commit_frame()" if |
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158 * "explicitSwapControl" option were set to "true". |
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159 **/ |
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160 } |
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161 }; |
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162 |
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163 |
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164 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) : |
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165 pimpl_(new PImpl(canvasSelector)) |
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166 { |
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167 } |
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168 |
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169 bool WebAssemblyOpenGLContext::IsContextLost() |
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170 { |
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171 return pimpl_->IsContextLost(); |
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172 } |
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173 |
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174 void WebAssemblyOpenGLContext::SetLostContext() |
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175 { |
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176 pimpl_->SetLostContext(); |
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177 } |
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178 |
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179 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const |
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180 { |
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181 return pimpl_->DebugGetInternalContext(); |
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182 } |
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183 |
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184 void WebAssemblyOpenGLContext::MakeCurrent() |
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185 { |
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186 assert(pimpl_.get() != NULL); |
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187 pimpl_->MakeCurrent(); |
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188 } |
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189 |
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190 void WebAssemblyOpenGLContext::SwapBuffer() |
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191 { |
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192 assert(pimpl_.get() != NULL); |
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193 pimpl_->SwapBuffer(); |
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194 } |
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195 |
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196 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const |
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197 { |
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198 assert(pimpl_.get() != NULL); |
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199 return pimpl_->GetCanvasSelector(); |
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200 } |
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201 } |
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202 } |