Mercurial > hg > orthanc-stone
annotate Framework/Viewport/WebAssemblyViewport.cpp @ 1050:d393ad9cf68c
fix
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 10 Oct 2019 14:31:56 +0200 |
parents | 6a9300ecfa13 |
children | 3c9529edf5fd |
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 "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 { |
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34 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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35 RegisterContextCallbacks(); |
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36 } |
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37 |
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38 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas, |
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39 boost::shared_ptr<Scene2D>& scene) : |
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40 WebAssemblyViewport(canvas, scene), |
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41 context_(canvas) |
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42 { |
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43 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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44 RegisterContextCallbacks(); |
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45 } |
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46 |
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47 void WebAssemblyOpenGLViewport::UpdateSize() |
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48 { |
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49 context_.UpdateSize(); // First read the size of the canvas |
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50 |
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51 if (compositor_.get() != NULL) |
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52 { |
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53 compositor_->Refresh(); // Then refresh the content of the canvas |
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54 } |
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55 } |
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56 |
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57 /* |
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58 typedef EM_BOOL (*em_webgl_context_callback)(int eventType, const void *reserved, void *userData); |
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59 |
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60 EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED |
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61 |
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62 EMSCRIPTEN_RESULT emscripten_set_webglcontextlost_callback( |
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63 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback) |
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64 |
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65 EMSCRIPTEN_RESULT emscripten_set_webglcontextrestored_callback( |
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66 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback) |
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67 |
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68 */ |
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69 |
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70 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextLost_callback( |
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71 int eventType, const void* reserved, void* userData) |
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72 { |
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73 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST); |
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74 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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75 return viewport->OpenGLContextLost(); |
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76 } |
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77 |
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78 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextRestored_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_WEBGLCONTEXTRESTORED); |
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82 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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83 return viewport->OpenGLContextRestored(); |
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84 } |
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85 |
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86 void WebAssemblyOpenGLViewport::DisableCompositor() |
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87 { |
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88 compositor_.reset(NULL); |
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89 } |
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90 |
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91 void WebAssemblyOpenGLViewport::Refresh() |
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92 { |
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93 try |
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94 { |
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95 if (!GetCompositor()) |
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96 { |
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97 // this block was added because of (perceived?) bugs in the |
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98 // browser where the WebGL contexts are NOT automatically restored |
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99 // after being lost. |
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100 // the WebGL context has been lost. Sce |
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101 |
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102 //LOG(ERROR) << "About to call WebAssemblyOpenGLContext::TryRecreate()."; |
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103 //LOG(ERROR) << "Before calling it, isContextLost == " << context_.IsContextLost(); |
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104 |
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105 if (!context_.IsContextLost()) { |
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106 LOG(TRACE) << "Context restored!"; |
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107 //LOG(ERROR) << "After calling it, isContextLost == " << context_.IsContextLost(); |
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108 RestoreCompositor(); |
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109 UpdateSize(); |
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110 } |
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111 } |
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112 if (GetCompositor()) { |
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113 GetCompositor()->Refresh(); |
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114 } |
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115 } |
1050 | 116 catch (const StoneException& e) |
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117 { |
1050 | 118 if (e.GetErrorCode() == ErrorCode_WebGLContextLost) |
119 { | |
120 LOG(WARNING) << "Context is lost! Compositor will be disabled."; | |
121 DisableCompositor(); | |
122 // we now need to wait for the "context restored" callback | |
123 } | |
124 else | |
125 { | |
126 throw; | |
127 } | |
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128 } |
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129 catch (...) |
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130 { |
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131 // something else nasty happened |
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132 throw; |
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133 } |
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134 } |
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135 |
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136 void WebAssemblyOpenGLViewport::RestoreCompositor() |
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137 { |
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138 // the context must have been restored! |
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139 ORTHANC_ASSERT(!context_.IsContextLost()); |
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140 if (compositor_.get() == NULL) |
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141 { |
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142 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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143 } |
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144 else |
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145 { |
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146 LOG(WARNING) << "RestoreCompositor() called for \"" << GetCanvasIdentifier() << "\" while it was NOT lost! Nothing done."; |
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147 } |
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148 } |
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149 |
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150 bool WebAssemblyOpenGLViewport::OpenGLContextLost() |
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151 { |
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152 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextLost() for canvas: " << GetCanvasIdentifier(); |
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153 DisableCompositor(); |
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154 return true; |
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155 } |
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156 |
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157 bool WebAssemblyOpenGLViewport::OpenGLContextRestored() |
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158 { |
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159 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextRestored() for canvas: " << GetCanvasIdentifier(); |
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160 |
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161 // maybe the context has already been restored by other means (the |
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162 // Refresh() function) |
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163 if (!GetCompositor()) |
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164 { |
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165 RestoreCompositor(); |
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166 UpdateSize(); |
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167 } |
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168 return false; |
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169 } |
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170 |
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171 void WebAssemblyOpenGLViewport::RegisterContextCallbacks() |
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172 { |
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173 #if 0 |
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174 // DISABLED ON 2019-08-20 and replaced by external JS calls because I could |
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175 // not get emscripten API to work |
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176 // TODO: what's the impact of userCapture=true ? |
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177 const char* canvasId = GetCanvasIdentifier().c_str(); |
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178 void* that = reinterpret_cast<void*>(this); |
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179 EMSCRIPTEN_RESULT status = EMSCRIPTEN_RESULT_SUCCESS; |
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180 |
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181 //status = emscripten_set_webglcontextlost_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextLost_callback); |
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182 //if (status != EMSCRIPTEN_RESULT_SUCCESS) |
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183 //{ |
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184 // std::stringstream ss; |
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185 // ss << "Error while calling emscripten_set_webglcontextlost_callback for: \"" << GetCanvasIdentifier() << "\""; |
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186 // std::string msg = ss.str(); |
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187 // LOG(ERROR) << msg; |
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188 // ORTHANC_ASSERT(false, msg.c_str()); |
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189 //} |
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190 |
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191 status = emscripten_set_webglcontextrestored_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextRestored_callback); |
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192 if (status != EMSCRIPTEN_RESULT_SUCCESS) |
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193 { |
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194 std::stringstream ss; |
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195 ss << "Error while calling emscripten_set_webglcontextrestored_callback for: \"" << GetCanvasIdentifier() << "\""; |
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196 std::string msg = ss.str(); |
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197 LOG(ERROR) << msg; |
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198 ORTHANC_ASSERT(false, msg.c_str()); |
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199 } |
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200 LOG(TRACE) << "WebAssemblyOpenGLViewport::RegisterContextCallbacks() SUCCESS!!!"; |
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201 #endif |
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202 } |
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203 |
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204 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas) : |
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205 WebAssemblyViewport(canvas), |
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206 canvas_(canvas), |
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207 compositor_(GetScene(), 1024, 768) |
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208 { |
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209 } |
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210 |
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211 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas, |
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212 boost::shared_ptr<Scene2D>& scene) : |
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213 WebAssemblyViewport(canvas, scene), |
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214 canvas_(canvas), |
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215 compositor_(GetScene(), 1024, 768) |
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216 { |
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217 } |
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218 |
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219 void WebAssemblyCairoViewport::UpdateSize() |
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220 { |
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221 LOG(INFO) << "updating cairo viewport size"; |
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222 double w, h; |
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223 emscripten_get_element_css_size(canvas_.c_str(), &w, &h); |
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224 |
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225 /** |
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226 * Emscripten has the function emscripten_get_element_css_size() |
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227 * to query the width and height of a named HTML element. I'm |
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228 * calling this first to get the initial size of the canvas DOM |
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229 * element, and then call emscripten_set_canvas_size() to |
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230 * initialize the framebuffer size of the canvas to the same |
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231 * size as its DOM element. |
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232 * https://floooh.github.io/2017/02/22/emsc-html.html |
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233 **/ |
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234 unsigned int canvasWidth = 0; |
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235 unsigned int canvasHeight = 0; |
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236 |
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237 if (w > 0 || |
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Added missing ORTHANC_OVERRIDE + preparation for lost GL context handling + stubs for GL context event handlers
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238 h > 0) |
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239 { |
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240 canvasWidth = static_cast<unsigned int>(boost::math::iround(w)); |
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241 canvasHeight = static_cast<unsigned int>(boost::math::iround(h)); |
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242 } |
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243 |
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244 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth, canvasHeight); |
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245 compositor_.UpdateSize(canvasWidth, canvasHeight); |
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246 } |
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247 |
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248 void WebAssemblyCairoViewport::Refresh() |
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249 { |
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250 LOG(INFO) << "refreshing cairo viewport, TODO: blit to the canvans.getContext('2d')"; |
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Fixed animation frame stopping when returning false + big work on the OpenGL
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251 GetCompositor()->Refresh(); |
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252 } |
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new abstraction: IViewport
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253 } |