Mercurial > hg > orthanc-stone
annotate Framework/Viewport/WebAssemblyViewport.cpp @ 1032:43bf09d73e03
Added tag toa2019100701 for changeset 7b89e88bb66e
author | Benjamin Golinvaux <bgo@osimis.io> |
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date | Mon, 07 Oct 2019 14:09:44 +0200 |
parents | d6b83ee3a950 |
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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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23 #include <emscripten/html5.h> |
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24 |
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25 namespace OrthancStone |
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26 { |
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27 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas) : |
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28 WebAssemblyViewport(canvas), |
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29 context_(canvas) |
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30 { |
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31 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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32 RegisterContextCallbacks(); |
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33 } |
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34 |
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35 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas, |
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36 boost::shared_ptr<Scene2D>& scene) : |
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37 WebAssemblyViewport(canvas, scene), |
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38 context_(canvas) |
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39 { |
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40 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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41 RegisterContextCallbacks(); |
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42 } |
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43 |
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44 void WebAssemblyOpenGLViewport::UpdateSize() |
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45 { |
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46 context_.UpdateSize(); // First read the size of the canvas |
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47 |
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48 if (compositor_.get() != NULL) |
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49 { |
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50 compositor_->Refresh(); // Then refresh the content of the canvas |
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51 } |
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52 } |
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53 |
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54 /* |
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55 typedef EM_BOOL (*em_webgl_context_callback)(int eventType, const void *reserved, void *userData); |
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56 |
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57 EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED |
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58 |
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59 EMSCRIPTEN_RESULT emscripten_set_webglcontextlost_callback( |
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60 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback) |
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61 |
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62 EMSCRIPTEN_RESULT emscripten_set_webglcontextrestored_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 */ |
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66 |
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67 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextLost_callback( |
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68 int eventType, const void* reserved, void* userData) |
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69 { |
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70 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST); |
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71 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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72 return viewport->OpenGLContextLost(); |
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73 } |
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74 |
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75 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextRestored_callback( |
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76 int eventType, const void* reserved, void* userData) |
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77 { |
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78 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED); |
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79 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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80 return viewport->OpenGLContextRestored(); |
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81 } |
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82 |
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83 void WebAssemblyOpenGLViewport::DisableCompositor() |
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84 { |
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85 compositor_.reset(NULL); |
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86 } |
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87 |
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88 void WebAssemblyOpenGLViewport::Refresh() |
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89 { |
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90 try |
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91 { |
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92 if (!GetCompositor()) |
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93 { |
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94 // this block was added because of (perceived?) bugs in the |
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95 // browser where the WebGL contexts are NOT automatically restored |
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96 // after being lost. |
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97 // the WebGL context has been lost. Sce |
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98 |
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99 //LOG(ERROR) << "About to call WebAssemblyOpenGLContext::TryRecreate()."; |
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100 //LOG(ERROR) << "Before calling it, isContextLost == " << context_.IsContextLost(); |
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101 |
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102 if (!context_.IsContextLost()) { |
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103 LOG(TRACE) << "Context restored!"; |
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104 //LOG(ERROR) << "After calling it, isContextLost == " << context_.IsContextLost(); |
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105 RestoreCompositor(); |
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106 UpdateSize(); |
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107 } |
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108 } |
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109 if (GetCompositor()) { |
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110 GetCompositor()->Refresh(); |
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111 } |
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112 } |
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113 catch (const OpenGLContextLostException& e) |
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114 { |
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115 LOG(WARNING) << "Context " << std::hex << e.context_ << " is lost! Compositor will be disabled."; |
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116 DisableCompositor(); |
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117 // we now need to wait for the "context restored" callback |
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118 } |
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119 catch (...) |
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120 { |
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121 // something else nasty happened |
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122 throw; |
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123 } |
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124 } |
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125 |
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126 bool WebAssemblyOpenGLViewport::IsContextLost() |
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127 { |
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128 return context_.IsContextLost(); |
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129 } |
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130 |
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131 void WebAssemblyOpenGLViewport::RestoreCompositor() |
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132 { |
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133 // the context must have been restored! |
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134 ORTHANC_ASSERT(!context_.IsContextLost()); |
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135 if (compositor_.get() == NULL) |
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136 { |
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137 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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138 } |
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139 else |
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140 { |
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141 LOG(WARNING) << "RestoreCompositor() called for \"" << GetCanvasIdentifier() << "\" while it was NOT lost! Nothing done."; |
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142 } |
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143 } |
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144 |
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145 bool WebAssemblyOpenGLViewport::OpenGLContextLost() |
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146 { |
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147 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextLost() for canvas: " << GetCanvasIdentifier(); |
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148 DisableCompositor(); |
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149 return true; |
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150 } |
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151 |
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152 bool WebAssemblyOpenGLViewport::OpenGLContextRestored() |
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153 { |
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154 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextRestored() for canvas: " << GetCanvasIdentifier(); |
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155 |
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156 // maybe the context has already been restored by other means (the |
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157 // Refresh() function) |
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158 if (!GetCompositor()) |
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159 { |
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160 RestoreCompositor(); |
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161 UpdateSize(); |
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162 } |
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163 return false; |
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164 } |
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165 |
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166 void* WebAssemblyOpenGLViewport::DebugGetInternalContext() const |
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167 { |
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168 return context_.DebugGetInternalContext(); |
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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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cleanup + started to implement WebAssemblyCairoViewport (wip)
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218 |
910
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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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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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251 GetCompositor()->Refresh(); |
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252 } |
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new abstraction: IViewport
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253 } |