Mercurial > hg > orthanc-stone
annotate Framework/Viewport/WebAssemblyViewport.cpp @ 1239:ce3052f28f2e toa2019122001
Added a lazy size update system in WebAssemblyOpenGLViewport::Refresh
author | Benjamin Golinvaux <bgo@osimis.io> |
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date | Fri, 20 Dec 2019 15:44:20 +0100 |
parents | 3c9529edf5fd |
children | a4bb8c2dd211 2d8ab34c8c91 |
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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 "WebAssemblyViewport.h" |
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24 #include "../StoneException.h" | |
25 | |
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26 #include <emscripten/html5.h> |
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27 |
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28 namespace OrthancStone |
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29 { |
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30 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas) |
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31 : WebAssemblyViewport(canvas) |
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32 , context_(canvas) |
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33 , cssWidth_(0) // will be set in Refresh() |
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34 , cssHeight_(0) // ditto |
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35 , pixelWidth_(0) // ditto |
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36 , pixelHeight_(0) // ditto |
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37 { |
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38 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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39 RegisterContextCallbacks(); |
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40 } |
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41 |
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42 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas, |
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43 boost::shared_ptr<Scene2D>& scene) |
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44 : WebAssemblyViewport(canvas, scene) |
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45 , context_(canvas) |
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46 , cssWidth_(0) // will be set in Refresh() |
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47 , cssHeight_(0) // ditto |
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48 , pixelWidth_(0) // ditto |
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49 , pixelHeight_(0) // ditto |
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50 { |
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51 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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52 RegisterContextCallbacks(); |
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53 } |
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54 |
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55 void WebAssemblyOpenGLViewport::UpdateSize() |
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56 { |
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57 context_.UpdateSize(); // First read the size of the canvas |
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58 |
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59 if (compositor_.get() != NULL) |
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60 { |
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61 compositor_->Refresh(); // Then refresh the content of the canvas |
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62 } |
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63 } |
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64 |
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65 /* |
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66 typedef EM_BOOL (*em_webgl_context_callback)(int eventType, const void *reserved, void *userData); |
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67 |
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68 EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED |
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69 |
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70 EMSCRIPTEN_RESULT emscripten_set_webglcontextlost_callback( |
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71 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback) |
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72 |
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73 EMSCRIPTEN_RESULT emscripten_set_webglcontextrestored_callback( |
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74 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback) |
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75 |
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76 */ |
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77 |
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78 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextLost_callback( |
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79 int eventType, const void* reserved, void* userData) |
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80 { |
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81 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST); |
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82 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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83 return viewport->OpenGLContextLost(); |
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84 } |
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85 |
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86 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextRestored_callback( |
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87 int eventType, const void* reserved, void* userData) |
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88 { |
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89 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED); |
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90 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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91 return viewport->OpenGLContextRestored(); |
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92 } |
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94 void WebAssemblyOpenGLViewport::DisableCompositor() |
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95 { |
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96 compositor_.reset(); |
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97 } |
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98 |
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99 ICompositor& WebAssemblyOpenGLViewport::GetCompositor() |
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100 { |
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101 if (compositor_.get() == NULL) |
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102 { |
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103 // "HasCompositor()" should have been called |
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104 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); |
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105 } |
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106 else |
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107 { |
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108 return *compositor_; |
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109 } |
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110 } |
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111 |
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112 void WebAssemblyOpenGLViewport::UpdateSizeIfNeeded() |
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113 { |
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114 bool needsRefresh = false; |
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115 std::string canvasId = GetCanvasIdentifier(); |
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116 |
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117 { |
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118 double cssWidth = 0; |
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119 double cssHeight = 0; |
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120 EMSCRIPTEN_RESULT res = EMSCRIPTEN_RESULT_SUCCESS; |
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121 res = |
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122 emscripten_get_element_css_size(canvasId.c_str(), &cssWidth, &cssHeight); |
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123 |
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124 if (res == EMSCRIPTEN_RESULT_SUCCESS) |
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125 { |
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126 if ((cssWidth != cssWidth_) || (cssHeight != cssHeight_)) |
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127 { |
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128 cssWidth_ = cssWidth; |
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129 cssHeight_ = cssHeight; |
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130 needsRefresh = true; |
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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 { |
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136 int pixelWidth = 0; |
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137 int pixelHeight = 0; |
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138 EMSCRIPTEN_RESULT res = EMSCRIPTEN_RESULT_SUCCESS; |
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139 res = |
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140 emscripten_get_canvas_element_size(canvasId.c_str(), &pixelWidth, &pixelHeight); |
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141 |
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142 if (res == EMSCRIPTEN_RESULT_SUCCESS) |
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143 { |
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144 if ((pixelWidth != pixelWidth_) || (pixelHeight != pixelHeight_)) |
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145 { |
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146 pixelWidth_ = pixelWidth; |
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147 pixelHeight_ = pixelHeight; |
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148 needsRefresh = true; |
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149 } |
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150 } |
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151 } |
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152 |
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153 if (needsRefresh) |
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154 UpdateSize(); |
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155 } |
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156 |
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157 void WebAssemblyOpenGLViewport::Refresh() |
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158 { |
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159 try |
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160 { |
1239
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161 // first, we check if the canvas size (both css size in css pixels and |
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162 // backing store) have changed. if so, we call UpdateSize to deal with |
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163 // it |
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164 |
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165 LOG(INFO) << "updating cairo viewport size"; |
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166 |
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167 // maybe the canvas size has changed and we need to update the |
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168 // canvas backing store size |
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169 UpdateSizeIfNeeded(); |
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170 |
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171 if (HasCompositor()) |
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172 { |
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173 GetCompositor().Refresh(); |
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174 } |
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175 else |
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176 { |
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177 // this block was added because of (perceived?) bugs in the |
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178 // browser where the WebGL contexts are NOT automatically restored |
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179 // after being lost. |
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180 // the WebGL context has been lost. Sce |
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181 |
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182 //LOG(ERROR) << "About to call WebAssemblyOpenGLContext::TryRecreate()."; |
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183 //LOG(ERROR) << "Before calling it, isContextLost == " << context_.IsContextLost(); |
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184 |
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185 if (!context_.IsContextLost()) |
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186 { |
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187 LOG(TRACE) << "Context restored!"; |
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188 //LOG(ERROR) << "After calling it, isContextLost == " << context_.IsContextLost(); |
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189 RestoreCompositor(); |
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190 UpdateSize(); |
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191 } |
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192 } |
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193 } |
1050 | 194 catch (const StoneException& e) |
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195 { |
1050 | 196 if (e.GetErrorCode() == ErrorCode_WebGLContextLost) |
197 { | |
198 LOG(WARNING) << "Context is lost! Compositor will be disabled."; | |
199 DisableCompositor(); | |
200 // we now need to wait for the "context restored" callback | |
201 } | |
202 else | |
203 { | |
204 throw; | |
205 } | |
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206 } |
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207 catch (...) |
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208 { |
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209 // something else nasty happened |
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210 throw; |
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211 } |
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212 } |
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213 |
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214 void WebAssemblyOpenGLViewport::RestoreCompositor() |
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215 { |
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216 // the context must have been restored! |
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217 ORTHANC_ASSERT(!context_.IsContextLost()); |
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218 if (compositor_.get() == NULL) |
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219 { |
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220 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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221 } |
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222 else |
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223 { |
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224 LOG(WARNING) << "RestoreCompositor() called for \"" << GetCanvasIdentifier() << "\" while it was NOT lost! Nothing done."; |
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225 } |
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226 } |
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227 |
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228 bool WebAssemblyOpenGLViewport::OpenGLContextLost() |
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229 { |
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230 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextLost() for canvas: " << GetCanvasIdentifier(); |
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231 DisableCompositor(); |
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232 return true; |
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233 } |
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234 |
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235 bool WebAssemblyOpenGLViewport::OpenGLContextRestored() |
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236 { |
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237 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextRestored() for canvas: " << GetCanvasIdentifier(); |
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238 |
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239 // maybe the context has already been restored by other means (the |
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240 // Refresh() function) |
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241 if (!HasCompositor()) |
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242 { |
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243 RestoreCompositor(); |
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244 UpdateSize(); |
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245 } |
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246 return false; |
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247 } |
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248 |
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249 void WebAssemblyOpenGLViewport::RegisterContextCallbacks() |
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250 { |
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251 #if 0 |
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252 // DISABLED ON 2019-08-20 and replaced by external JS calls because I could |
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253 // not get emscripten API to work |
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254 // TODO: what's the impact of userCapture=true ? |
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255 const char* canvasId = GetCanvasIdentifier().c_str(); |
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256 void* that = reinterpret_cast<void*>(this); |
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257 EMSCRIPTEN_RESULT status = EMSCRIPTEN_RESULT_SUCCESS; |
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258 |
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259 //status = emscripten_set_webglcontextlost_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextLost_callback); |
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260 //if (status != EMSCRIPTEN_RESULT_SUCCESS) |
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261 //{ |
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262 // std::stringstream ss; |
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263 // ss << "Error while calling emscripten_set_webglcontextlost_callback for: \"" << GetCanvasIdentifier() << "\""; |
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264 // std::string msg = ss.str(); |
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265 // LOG(ERROR) << msg; |
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266 // ORTHANC_ASSERT(false, msg.c_str()); |
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267 //} |
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268 |
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269 status = emscripten_set_webglcontextrestored_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextRestored_callback); |
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270 if (status != EMSCRIPTEN_RESULT_SUCCESS) |
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271 { |
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272 std::stringstream ss; |
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273 ss << "Error while calling emscripten_set_webglcontextrestored_callback for: \"" << GetCanvasIdentifier() << "\""; |
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274 std::string msg = ss.str(); |
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275 LOG(ERROR) << msg; |
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276 ORTHANC_ASSERT(false, msg.c_str()); |
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277 } |
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278 LOG(TRACE) << "WebAssemblyOpenGLViewport::RegisterContextCallbacks() SUCCESS!!!"; |
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279 #endif |
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280 } |
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281 |
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282 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas) : |
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283 WebAssemblyViewport(canvas), |
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284 canvas_(canvas), |
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285 compositor_(GetScene(), 1024, 768) |
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286 { |
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287 } |
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288 |
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289 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas, |
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290 boost::shared_ptr<Scene2D>& scene) : |
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291 WebAssemblyViewport(canvas, scene), |
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292 canvas_(canvas), |
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293 compositor_(GetScene(), 1024, 768) |
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294 { |
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295 } |
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296 |
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297 void WebAssemblyCairoViewport::UpdateSize() |
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298 { |
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299 LOG(INFO) << "updating cairo viewport size"; |
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300 double w, h; |
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301 emscripten_get_element_css_size(canvas_.c_str(), &w, &h); |
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302 |
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303 /** |
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304 * Emscripten has the function emscripten_get_element_css_size() |
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305 * to query the width and height of a named HTML element. I'm |
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306 * calling this first to get the initial size of the canvas DOM |
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307 * element, and then call emscripten_set_canvas_size() to |
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308 * initialize the framebuffer size of the canvas to the same |
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309 * size as its DOM element. |
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310 * https://floooh.github.io/2017/02/22/emsc-html.html |
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311 **/ |
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312 unsigned int canvasWidth = 0; |
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313 unsigned int canvasHeight = 0; |
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314 |
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315 if (w > 0 || |
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316 h > 0) |
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317 { |
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318 canvasWidth = static_cast<unsigned int>(boost::math::iround(w)); |
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319 canvasHeight = static_cast<unsigned int>(boost::math::iround(h)); |
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320 } |
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321 |
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322 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth, canvasHeight); |
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323 compositor_.UpdateSize(canvasWidth, canvasHeight); |
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324 } |
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325 |
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326 void WebAssemblyCairoViewport::Refresh() |
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327 { |
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328 LOG(INFO) << "refreshing cairo viewport, TODO: blit to the canvans.getContext('2d')"; |
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329 GetCompositor().Refresh(); |
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330 } |
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331 } |