Mercurial > hg > orthanc-stone
annotate Framework/OpenGL/WebAssemblyOpenGLContext.cpp @ 947:1091b2adeb5a toa2019081001
Fixed animation frame stopping when returning false + big work on the OpenGL
objects to make them lost context-safe + debug code to forcefully tag a
context as lost + debug macros
author | Benjamin Golinvaux <bgo@osimis.io> |
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date | Sat, 10 Aug 2019 13:07:31 +0200 |
parents | 2db3ef713664 |
children | a7351ad54960 |
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) 2017-2019 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 "WebAssemblyOpenGLContext.h" |
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23 |
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24 #include "../StoneException.h" |
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25 |
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26 #include <Core/OrthancException.h> |
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27 |
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28 #include <emscripten/html5.h> |
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29 #include <emscripten/em_asm.h> |
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30 |
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31 #include <boost/math/special_functions/round.hpp> |
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32 |
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33 namespace OrthancStone |
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34 { |
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35 namespace OpenGL |
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36 { |
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37 class WebAssemblyOpenGLContext::PImpl |
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38 { |
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39 private: |
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40 std::string canvas_; |
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41 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_; |
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42 unsigned int canvasWidth_; |
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43 unsigned int canvasHeight_; |
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44 bool isContextLost_; |
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45 |
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46 public: |
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47 PImpl(const std::string& canvas) |
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48 : canvas_(canvas) |
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49 , isContextLost_(false) |
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50 { |
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51 // Context configuration |
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52 EmscriptenWebGLContextAttributes attr; |
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53 emscripten_webgl_init_context_attributes(&attr); |
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54 |
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55 context_ = emscripten_webgl_create_context(canvas.c_str(), &attr); |
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56 if (context_ == 0) |
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57 { |
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58 std::string message("Cannot create an OpenGL context for canvas: "); |
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59 message += canvas; |
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60 LOG(ERROR) << message; |
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61 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message); |
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62 } |
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63 |
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64 UpdateSize(); |
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65 } |
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66 |
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67 void* DebugGetInternalContext() const |
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68 { |
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69 return reinterpret_cast<void*>(context_); |
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70 } |
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71 |
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72 bool IsContextLost() const |
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73 { |
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74 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0); |
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75 bool ownFlag = isContextLost_; |
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76 if (ownFlag != apiFlag) |
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77 { |
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78 LOG(WARNING) << "Context loss, according to emscripten, is: " << apiFlag << " | while, according to internal state, is: " << ownFlag; |
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79 } |
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80 return ownFlag | apiFlag; |
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81 } |
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82 |
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83 void SetLostContext() |
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84 { |
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85 isContextLost_ = true; |
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86 } |
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87 |
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88 ~PImpl() |
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89 { |
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90 emscripten_webgl_destroy_context(context_); |
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91 } |
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92 |
617 | 93 const std::string& GetCanvasIdentifier() const |
94 { | |
95 return canvas_; | |
96 } | |
97 | |
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98 void MakeCurrent() |
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99 { |
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100 if (IsContextLost()) |
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101 { |
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102 LOG(ERROR) << "MakeCurrent() called on lost context " << context_; |
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103 throw OpenGLContextLostException(reinterpret_cast<void*>(context_)); |
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104 } |
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105 |
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106 if (emscripten_is_webgl_context_lost(context_)) |
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107 { |
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108 LOG(ERROR) << "OpenGL context has been lost for canvas: " << canvas_; |
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109 SetLostContext(); |
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110 throw OpenGLContextLostException(reinterpret_cast<void*>(context_)); |
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111 } |
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112 |
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113 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS) |
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114 { |
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115 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, |
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116 "Cannot set the OpenGL context"); |
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117 } |
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118 } |
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119 |
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120 void SwapBuffer() |
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121 { |
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122 /** |
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123 * "Rendered WebGL content is implicitly presented (displayed to |
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124 * the user) on the canvas when the event handler that renders with |
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125 * WebGL returns back to the browser event loop." |
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126 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context |
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127 * |
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128 * Could call "emscripten_webgl_commit_frame()" if |
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129 * "explicitSwapControl" option were set to "true". |
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130 **/ |
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131 } |
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132 |
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133 unsigned int GetCanvasWidth() const |
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134 { |
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135 return canvasWidth_; |
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136 } |
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137 |
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138 unsigned int GetCanvasHeight() const |
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139 { |
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140 return canvasHeight_; |
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141 } |
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142 |
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143 void UpdateSize() |
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144 { |
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145 double w, h; |
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146 emscripten_get_element_css_size(canvas_.c_str(), &w, &h); |
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147 |
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148 /** |
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149 * Emscripten has the function emscripten_get_element_css_size() |
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150 * to query the width and height of a named HTML element. I'm |
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151 * calling this first to get the initial size of the canvas DOM |
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152 * element, and then call emscripten_set_canvas_size() to |
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153 * initialize the framebuffer size of the canvas to the same |
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154 * size as its DOM element. |
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155 * https://floooh.github.io/2017/02/22/emsc-html.html |
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156 **/ |
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157 |
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158 if (w <= 0 || |
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159 h <= 0) |
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160 { |
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161 canvasWidth_ = 0; |
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162 canvasHeight_ = 0; |
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163 } |
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164 else |
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165 { |
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166 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w)); |
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167 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h)); |
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168 } |
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169 |
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170 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth_, canvasHeight_); |
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171 } |
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172 }; |
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173 |
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174 |
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175 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvas) : |
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176 pimpl_(new PImpl(canvas)) |
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177 { |
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178 } |
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179 |
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180 bool WebAssemblyOpenGLContext::IsContextLost() const |
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181 { |
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182 return pimpl_->IsContextLost(); |
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183 } |
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184 |
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185 void WebAssemblyOpenGLContext::RestoreLostContext() |
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186 { |
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187 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented); |
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188 } |
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189 |
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190 void WebAssemblyOpenGLContext::SetLostContext() |
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191 { |
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192 pimpl_->SetLostContext(); |
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193 } |
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194 |
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195 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const |
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196 { |
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197 return pimpl_->DebugGetInternalContext(); |
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198 } |
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199 |
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200 void WebAssemblyOpenGLContext::MakeCurrent() |
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201 { |
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202 assert(pimpl_.get() != NULL); |
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203 pimpl_->MakeCurrent(); |
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204 } |
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205 |
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206 void WebAssemblyOpenGLContext::SwapBuffer() |
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207 { |
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208 assert(pimpl_.get() != NULL); |
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209 pimpl_->SwapBuffer(); |
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210 } |
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211 |
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212 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const |
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213 { |
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214 assert(pimpl_.get() != NULL); |
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215 return pimpl_->GetCanvasWidth(); |
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216 } |
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217 |
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218 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const |
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219 { |
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220 assert(pimpl_.get() != NULL); |
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221 return pimpl_->GetCanvasHeight(); |
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222 } |
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223 |
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224 void WebAssemblyOpenGLContext::UpdateSize() |
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225 { |
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226 assert(pimpl_.get() != NULL); |
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227 pimpl_->UpdateSize(); |
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228 } |
617 | 229 |
230 const std::string& WebAssemblyOpenGLContext::GetCanvasIdentifier() const | |
231 { | |
232 assert(pimpl_.get() != NULL); | |
233 return pimpl_->GetCanvasIdentifier(); | |
234 } | |
616
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235 } |
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236 } |