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annotate Framework/Viewport/WebAssemblyViewport.cpp @ 1045:6a9300ecfa13

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tests for context loss are now restricted to WebAssembly
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 09 Oct 2019 17:17:56 +0200
parents d6b83ee3a950
children d393ad9cf68c
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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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54 /*
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55 typedef EM_BOOL (*em_webgl_context_callback)(int eventType, const void *reserved, void *userData);
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57 EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED
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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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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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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 void WebAssemblyOpenGLViewport::RestoreCompositor()
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127 {
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128 // the context must have been restored!
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129 ORTHANC_ASSERT(!context_.IsContextLost());
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130 if (compositor_.get() == NULL)
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131 {
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132 compositor_.reset(new OpenGLCompositor(context_, GetScene()));
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133 }
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134 else
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135 {
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136 LOG(WARNING) << "RestoreCompositor() called for \"" << GetCanvasIdentifier() << "\" while it was NOT lost! Nothing done.";
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137 }
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138 }
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139
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140 bool WebAssemblyOpenGLViewport::OpenGLContextLost()
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141 {
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142 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextLost() for canvas: " << GetCanvasIdentifier();
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143 DisableCompositor();
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144 return true;
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145 }
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146
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147 bool WebAssemblyOpenGLViewport::OpenGLContextRestored()
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148 {
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149 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextRestored() for canvas: " << GetCanvasIdentifier();
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150
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151 // maybe the context has already been restored by other means (the
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152 // Refresh() function)
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153 if (!GetCompositor())
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154 {
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155 RestoreCompositor();
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156 UpdateSize();
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157 }
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158 return false;
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159 }
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160
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161 void WebAssemblyOpenGLViewport::RegisterContextCallbacks()
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162 {
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163 #if 0
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164 // DISABLED ON 2019-08-20 and replaced by external JS calls because I could
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165 // not get emscripten API to work
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166 // TODO: what's the impact of userCapture=true ?
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167 const char* canvasId = GetCanvasIdentifier().c_str();
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168 void* that = reinterpret_cast<void*>(this);
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169 EMSCRIPTEN_RESULT status = EMSCRIPTEN_RESULT_SUCCESS;
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170
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171 //status = emscripten_set_webglcontextlost_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextLost_callback);
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172 //if (status != EMSCRIPTEN_RESULT_SUCCESS)
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173 //{
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174 // std::stringstream ss;
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175 // ss << "Error while calling emscripten_set_webglcontextlost_callback for: \"" << GetCanvasIdentifier() << "\"";
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176 // std::string msg = ss.str();
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177 // LOG(ERROR) << msg;
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178 // ORTHANC_ASSERT(false, msg.c_str());
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179 //}
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180
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181 status = emscripten_set_webglcontextrestored_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextRestored_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_webglcontextrestored_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 LOG(TRACE) << "WebAssemblyOpenGLViewport::RegisterContextCallbacks() SUCCESS!!!";
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191 #endif
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192 }
907
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193
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194 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas) :
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195 WebAssemblyViewport(canvas),
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196 canvas_(canvas),
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197 compositor_(GetScene(), 1024, 768)
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198 {
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199 }
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200
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201 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas,
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202 boost::shared_ptr<Scene2D>& scene) :
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203 WebAssemblyViewport(canvas, scene),
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204 canvas_(canvas),
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205 compositor_(GetScene(), 1024, 768)
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206 {
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207 }
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208
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209 void WebAssemblyCairoViewport::UpdateSize()
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210 {
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211 LOG(INFO) << "updating cairo viewport size";
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212 double w, h;
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213 emscripten_get_element_css_size(canvas_.c_str(), &w, &h);
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214
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215 /**
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216 * Emscripten has the function emscripten_get_element_css_size()
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217 * to query the width and height of a named HTML element. I'm
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218 * calling this first to get the initial size of the canvas DOM
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219 * element, and then call emscripten_set_canvas_size() to
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220 * initialize the framebuffer size of the canvas to the same
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221 * size as its DOM element.
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222 * https://floooh.github.io/2017/02/22/emsc-html.html
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223 **/
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224 unsigned int canvasWidth = 0;
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225 unsigned int canvasHeight = 0;
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226
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227 if (w > 0 ||
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228 h > 0)
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229 {
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230 canvasWidth = static_cast<unsigned int>(boost::math::iround(w));
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231 canvasHeight = static_cast<unsigned int>(boost::math::iround(h));
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232 }
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233
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234 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth, canvasHeight);
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235 compositor_.UpdateSize(canvasWidth, canvasHeight);
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236 }
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237
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238 void WebAssemblyCairoViewport::Refresh()
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239 {
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240 LOG(INFO) << "refreshing cairo viewport, TODO: blit to the canvans.getContext('2d')";
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241 GetCompositor()->Refresh();
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242 }
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243 }