Mercurial > hg > orthanc-stone

annotate Framework/Viewport/WebAssemblyViewport.cpp @ 964:91f827272c1f toa2019082701

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Added cache-control headers for POST requests + #ifdef'd tracing logs + trace on context restored
author Benjamin Golinvaux <bgo@osimis.io>
date Tue, 27 Aug 2019 14:28:19 +0200
parents a7351ad54960
children 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 if(compositor_.get() != NULL)
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47 compositor_->Refresh(); // Then refresh the content of the canvas
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48 context_.UpdateSize(); // First read the size of the canvas
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49 }
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51 /*
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52 typedef EM_BOOL (*em_webgl_context_callback)(int eventType, const void *reserved, void *userData);
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54 EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED
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55
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56 EMSCRIPTEN_RESULT emscripten_set_webglcontextlost_callback(
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57 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback)
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58
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59 EMSCRIPTEN_RESULT emscripten_set_webglcontextrestored_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 */
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63
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64 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextLost_callback(
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65 int eventType, const void* reserved, void* userData)
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66 {
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67 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST);
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68 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData);
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69 return viewport->OpenGLContextLost();
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70 }
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72 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextRestored_callback(
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73 int eventType, const void* reserved, void* userData)
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74 {
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75 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED);
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76 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData);
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77 return viewport->OpenGLContextRestored();
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78 }
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79
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80 void WebAssemblyOpenGLViewport::DisableCompositor()
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81 {
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82 compositor_.reset(NULL);
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83 }
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84
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85 void WebAssemblyOpenGLViewport::Refresh()
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86 {
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87 try
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88 {
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89 if (!GetCompositor())
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90 {
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91 // this block was added because of (perceived?) bugs in the
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92 // browser where the WebGL contexts are NOT automatically restored
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93 // after being lost.
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94 // the WebGL context has been lost. Sce
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95
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96 //LOG(ERROR) << "About to call WebAssemblyOpenGLContext::TryRecreate().";
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97 //LOG(ERROR) << "Before calling it, isContextLost == " << context_.IsContextLost();
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98
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99 if (!context_.IsContextLost()) {
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100 LOG(TRACE) << "Context restored!";
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101 //LOG(ERROR) << "After calling it, isContextLost == " << context_.IsContextLost();
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102 RestoreCompositor();
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103 UpdateSize();
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104 }
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105 }
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106 if (GetCompositor()) {
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107 GetCompositor()->Refresh();
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108 }
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109 }
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110 catch (const OpenGLContextLostException& e)
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111 {
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112 LOG(WARNING) << "Context " << std::hex << e.context_ << " is lost! Compositor will be disabled.";
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113 DisableCompositor();
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114 // we now need to wait for the "context restored" callback
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115 }
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116 catch (...)
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117 {
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118 // something else nasty happened
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119 throw;
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120 }
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121 }
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122
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123 bool WebAssemblyOpenGLViewport::IsContextLost()
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124 {
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125 return context_.IsContextLost();
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126 }
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127
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128 void WebAssemblyOpenGLViewport::RestoreCompositor()
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129 {
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130 // the context must have been restored!
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131 ORTHANC_ASSERT(!context_.IsContextLost());
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132 if (compositor_.get() == NULL)
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133 {
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134 compositor_.reset(new OpenGLCompositor(context_, GetScene()));
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135 }
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136 else
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137 {
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138 LOG(WARNING) << "RestoreCompositor() called for \"" << GetCanvasIdentifier() << "\" while it was NOT lost! Nothing done.";
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139 }
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140 }
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141
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142 bool WebAssemblyOpenGLViewport::OpenGLContextLost()
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143 {
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144 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextLost() for canvas: " << GetCanvasIdentifier();
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145 DisableCompositor();
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146 return true;
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147 }
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148
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149 bool WebAssemblyOpenGLViewport::OpenGLContextRestored()
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150 {
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151 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextRestored() for canvas: " << GetCanvasIdentifier();
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152
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153 // maybe the context has already been restored by other means (the
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154 // Refresh() function)
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155 if (!GetCompositor())
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156 {
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157 RestoreCompositor();
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158 UpdateSize();
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159 }
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160 return false;
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161 }
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162
956
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163 void* WebAssemblyOpenGLViewport::DebugGetInternalContext() const
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164 {
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165 return context_.DebugGetInternalContext();
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166 }
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167
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168 void WebAssemblyOpenGLViewport::RegisterContextCallbacks()
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169 {
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170 #if 0
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171 // DISABLED ON 2019-08-20 and replaced by external JS calls because I could
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172 // not get emscripten API to work
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173 // TODO: what's the impact of userCapture=true ?
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174 const char* canvasId = GetCanvasIdentifier().c_str();
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175 void* that = reinterpret_cast<void*>(this);
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176 EMSCRIPTEN_RESULT status = EMSCRIPTEN_RESULT_SUCCESS;
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177
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178 //status = emscripten_set_webglcontextlost_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextLost_callback);
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179 //if (status != EMSCRIPTEN_RESULT_SUCCESS)
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180 //{
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181 // std::stringstream ss;
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182 // ss << "Error while calling emscripten_set_webglcontextlost_callback for: \"" << GetCanvasIdentifier() << "\"";
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183 // std::string msg = ss.str();
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184 // LOG(ERROR) << msg;
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185 // ORTHANC_ASSERT(false, msg.c_str());
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186 //}
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187
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188 status = emscripten_set_webglcontextrestored_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextRestored_callback);
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189 if (status != EMSCRIPTEN_RESULT_SUCCESS)
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190 {
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191 std::stringstream ss;
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192 ss << "Error while calling emscripten_set_webglcontextrestored_callback for: \"" << GetCanvasIdentifier() << "\"";
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193 std::string msg = ss.str();
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194 LOG(ERROR) << msg;
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195 ORTHANC_ASSERT(false, msg.c_str());
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196 }
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197 LOG(TRACE) << "WebAssemblyOpenGLViewport::RegisterContextCallbacks() SUCCESS!!!";
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198 #endif
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199 }
907
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200
910
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201 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas) :
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202 WebAssemblyViewport(canvas),
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203 canvas_(canvas),
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204 compositor_(GetScene(), 1024, 768)
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205 {
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206 }
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207
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208 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas,
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209 boost::shared_ptr<Scene2D>& scene) :
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210 WebAssemblyViewport(canvas, scene),
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211 canvas_(canvas),
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212 compositor_(GetScene(), 1024, 768)
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213 {
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214 }
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215
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216 void WebAssemblyCairoViewport::UpdateSize()
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217 {
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218 LOG(INFO) << "updating cairo viewport size";
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219 double w, h;
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220 emscripten_get_element_css_size(canvas_.c_str(), &w, &h);
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221
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222 /**
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223 * Emscripten has the function emscripten_get_element_css_size()
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224 * to query the width and height of a named HTML element. I'm
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225 * calling this first to get the initial size of the canvas DOM
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226 * element, and then call emscripten_set_canvas_size() to
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227 * initialize the framebuffer size of the canvas to the same
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228 * size as its DOM element.
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229 * https://floooh.github.io/2017/02/22/emsc-html.html
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230 **/
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231 unsigned int canvasWidth = 0;
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232 unsigned int canvasHeight = 0;
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233
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234 if (w > 0 ||
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235 h > 0)
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236 {
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237 canvasWidth = static_cast<unsigned int>(boost::math::iround(w));
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238 canvasHeight = static_cast<unsigned int>(boost::math::iround(h));
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239 }
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240
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241 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth, canvasHeight);
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242 compositor_.UpdateSize(canvasWidth, canvasHeight);
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243 }
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244
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245 void WebAssemblyCairoViewport::Refresh()
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246 {
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247 LOG(INFO) << "refreshing cairo viewport, TODO: blit to the canvans.getContext('2d')";
947
1091b2adeb5a Fixed animation frame stopping when returning false + big work on the OpenGL
Benjamin Golinvaux <bgo@osimis.io>
parents: 942
diff changeset
248 GetCompositor()->Refresh();
910
a6c12fe88bcb wip: WebAssemblyCairoViewport: still need to implement blit to canvas
Alain Mazy <alain@mazy.be>
parents: 907
diff changeset
249 }
891
0aff28f15ea2 new abstraction: IViewport
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
250 }