Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/OpenGL/WebAssemblyOpenGLContext.cpp @ 1575:e4a52cbbdd70
working on print
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 23 Sep 2020 17:25:25 +0200 |
parents | 85e117739eca |
children | 92fca2b3ba3d |
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) 2017-2020 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 |
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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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26 #include <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 canvasSelector_; |
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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: |
1571 | 47 explicit PImpl(const std::string& canvasSelector) : |
48 canvasSelector_(canvasSelector), | |
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 |
1575 | 55 #if 0 |
56 // The next line might be necessary to print on Firefox 71 | |
57 // using WebGL. Sometimes, if set to "false" (the default | |
58 // value), the canvas was rendered as a fully white or black | |
59 // area. UNCONFIRMED, so disabled. | |
60 attr.preserveDrawingBuffer = true; | |
61 #endif | |
62 | |
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63 context_ = emscripten_webgl_create_context(canvasSelector.c_str(), &attr); |
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64 if (context_ == 0) |
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65 { |
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66 std::string message("Cannot create an OpenGL context for the element with the following CSS selector: \""); |
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67 message += canvasSelector; |
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68 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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69 LOG(ERROR) << message; |
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70 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message); |
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71 } |
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72 |
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73 UpdateSize(); |
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74 } |
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75 |
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76 void* DebugGetInternalContext() const |
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77 { |
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78 return reinterpret_cast<void*>(context_); |
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79 } |
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80 |
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81 bool IsContextLost() |
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82 { |
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83 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec; |
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84 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0); |
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85 isContextLost_ = apiFlag; |
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86 return isContextLost_; |
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87 } |
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88 |
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89 void SetLostContext() |
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90 { |
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91 isContextLost_ = true; |
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92 } |
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93 |
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94 ~PImpl() |
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95 { |
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96 try |
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97 { |
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98 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_); |
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99 if (result != EMSCRIPTEN_RESULT_SUCCESS) |
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100 { |
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101 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result; |
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102 } |
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103 } |
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104 catch (const Orthanc::OrthancException& e) |
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105 { |
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106 if (e.HasDetails()) |
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107 { |
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108 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails(); |
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109 } |
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110 else |
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111 { |
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112 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What(); |
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113 } |
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114 } |
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115 catch (const std::exception& e) |
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116 { |
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117 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what(); |
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118 } |
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119 catch (...) |
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120 { |
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121 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl"; |
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122 } |
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123 } |
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124 |
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125 const std::string& GetCanvasSelector() const |
617 | 126 { |
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127 return canvasSelector_; |
617 | 128 } |
129 | |
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130 void MakeCurrent() |
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131 { |
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132 if (IsContextLost()) |
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133 { |
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134 LOG(ERROR) << "MakeCurrent() called on lost context " << context_; |
1050 | 135 throw StoneException(ErrorCode_WebGLContextLost); |
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136 } |
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137 |
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138 if (emscripten_is_webgl_context_lost(context_)) |
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139 { |
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140 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_; |
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141 SetLostContext(); |
1050 | 142 throw StoneException(ErrorCode_WebGLContextLost); |
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143 } |
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144 |
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145 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS) |
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146 { |
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147 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, |
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148 "Cannot set the OpenGL context"); |
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149 } |
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150 } |
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151 |
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152 void SwapBuffer() |
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153 { |
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154 /** |
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155 * "Rendered WebGL content is implicitly presented (displayed to |
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156 * the user) on the canvas when the event handler that renders with |
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157 * WebGL returns back to the browser event loop." |
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158 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context |
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159 * |
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160 * Could call "emscripten_webgl_commit_frame()" if |
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161 * "explicitSwapControl" option were set to "true". |
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162 **/ |
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163 } |
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164 |
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165 unsigned int GetCanvasWidth() const |
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166 { |
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167 return canvasWidth_; |
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168 } |
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169 |
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170 unsigned int GetCanvasHeight() const |
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171 { |
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172 return canvasHeight_; |
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173 } |
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174 |
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175 void UpdateSize() |
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176 { |
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177 double w, h; |
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178 emscripten_get_element_css_size(canvasSelector_.c_str(), &w, &h); |
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179 |
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180 /** |
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181 * Emscripten has the function emscripten_get_element_css_size() |
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182 * to query the width and height of a named HTML element. I'm |
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183 * calling this first to get the initial size of the canvas DOM |
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184 * element, and then call emscripten_set_canvas_size() to |
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185 * initialize the framebuffer size of the canvas to the same |
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186 * size as its DOM element. |
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187 * https://floooh.github.io/2017/02/22/emsc-html.html |
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188 **/ |
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189 |
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190 if (w <= 0 || |
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191 h <= 0) |
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192 { |
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193 canvasWidth_ = 0; |
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194 canvasHeight_ = 0; |
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195 } |
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196 else |
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197 { |
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198 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w)); |
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199 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h)); |
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200 } |
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201 |
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202 emscripten_set_canvas_element_size(canvasSelector_.c_str(), canvasWidth_, canvasHeight_); |
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203 } |
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204 }; |
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205 |
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206 |
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207 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) : |
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208 pimpl_(new PImpl(canvasSelector)) |
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209 { |
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210 } |
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211 |
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212 bool WebAssemblyOpenGLContext::IsContextLost() |
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213 { |
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214 return pimpl_->IsContextLost(); |
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215 } |
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216 |
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217 void WebAssemblyOpenGLContext::SetLostContext() |
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218 { |
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219 pimpl_->SetLostContext(); |
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220 } |
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221 |
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222 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const |
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223 { |
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224 return pimpl_->DebugGetInternalContext(); |
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225 } |
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226 |
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227 void WebAssemblyOpenGLContext::MakeCurrent() |
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228 { |
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229 assert(pimpl_.get() != NULL); |
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230 pimpl_->MakeCurrent(); |
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231 } |
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232 |
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233 void WebAssemblyOpenGLContext::SwapBuffer() |
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234 { |
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235 assert(pimpl_.get() != NULL); |
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236 pimpl_->SwapBuffer(); |
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237 } |
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238 |
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239 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const |
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240 { |
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241 assert(pimpl_.get() != NULL); |
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242 return pimpl_->GetCanvasWidth(); |
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243 } |
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244 |
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245 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const |
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246 { |
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247 assert(pimpl_.get() != NULL); |
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248 return pimpl_->GetCanvasHeight(); |
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249 } |
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250 |
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251 void WebAssemblyOpenGLContext::RefreshCanvasSize() |
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252 { |
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253 assert(pimpl_.get() != NULL); |
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254 |
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255 try |
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256 { |
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257 pimpl_->UpdateSize(); |
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258 } |
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259 catch (const StoneException& e) |
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260 { |
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261 // Ignore problems about the loss of the WebGL context (edge case) |
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262 if (e.GetErrorCode() == ErrorCode_WebGLContextLost) |
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263 { |
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264 return; |
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265 } |
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266 else |
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267 { |
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268 throw; |
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269 } |
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270 } |
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271 } |
617 | 272 |
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273 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const |
617 | 274 { |
275 assert(pimpl_.get() != NULL); | |
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276 return pimpl_->GetCanvasSelector(); |
617 | 277 } |
616
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278 } |
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279 } |