Mercurial > hg > orthanc-stone

annotate Framework/OpenGL/WebAssemblyOpenGLContext.cpp @ 958:769249e1f3b4

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added guards to prevent calling methods on a dead controller (see comment in diff for expl.) + build fix
author Benjamin Golinvaux <bgo@osimis.io>
date Fri, 23 Aug 2019 10:16:32 +0200
parents a7351ad54960
children 92e32e263ae9
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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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22 #include "WebAssemblyOpenGLContext.h"
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24 #include "../StoneException.h"
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25
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26 #include <Core/OrthancException.h>
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27
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28 #include <emscripten/html5.h>
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29 #include <emscripten/em_asm.h>
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30
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31 #include <boost/math/special_functions/round.hpp>
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32
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33 namespace OrthancStone
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34 {
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35 namespace OpenGL
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36 {
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37 class WebAssemblyOpenGLContext::PImpl
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38 {
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39 private:
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40 std::string canvas_;
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41 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_;
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42 unsigned int canvasWidth_;
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43 unsigned int canvasHeight_;
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44 bool isContextLost_;
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46 public:
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47 PImpl(const std::string& canvas)
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48 : canvas_(canvas)
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49 , isContextLost_(false)
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50 {
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51 // Context configuration
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52 EmscriptenWebGLContextAttributes attr;
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53 emscripten_webgl_init_context_attributes(&attr);
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54
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55 context_ = emscripten_webgl_create_context(canvas.c_str(), &attr);
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56 if (context_ == 0)
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57 {
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58 std::string message("Cannot create an OpenGL context for canvas: ");
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59 message += canvas;
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60 LOG(ERROR) << message;
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61 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message);
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62 }
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63
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64 UpdateSize();
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65 }
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66
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67 void* DebugGetInternalContext() const
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68 {
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69 return reinterpret_cast<void*>(context_);
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70 }
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71
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72 bool IsContextLost()
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73 {
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74 LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec;
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75 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0);
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76 isContextLost_ = apiFlag;
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77 return isContextLost_;
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78 }
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79
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80 void SetLostContext()
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81 {
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82 isContextLost_ = true;
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83 }
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84
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85 ~PImpl()
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86 {
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87 try
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88 {
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89 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_);
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90 if (result != EMSCRIPTEN_RESULT_SUCCESS)
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91 {
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92 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result;
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93 }
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94 }
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95 catch (const Orthanc::OrthancException& e)
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96 {
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97 if (e.HasDetails())
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98 {
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99 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails();
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100 }
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101 else
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102 {
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103 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What();
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104 }
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105 }
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106 catch (const std::exception& e)
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107 {
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108 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what();
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109 }
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110 catch (...)
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111 {
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112 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl";
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113 }
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114 }
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115
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116 const std::string& GetCanvasIdentifier() const
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117 {
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118 return canvas_;
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119 }
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120
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121 void MakeCurrent()
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122 {
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123 if (IsContextLost())
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124 {
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125 LOG(ERROR) << "MakeCurrent() called on lost context " << context_;
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126 throw OpenGLContextLostException(reinterpret_cast<void*>(context_));
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127 }
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128
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129 if (emscripten_is_webgl_context_lost(context_))
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130 {
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131 LOG(ERROR) << "OpenGL context has been lost for canvas: " << canvas_;
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132 SetLostContext();
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133 throw OpenGLContextLostException(reinterpret_cast<void*>(context_));
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134 }
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135
616
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136 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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137 {
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138 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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139 "Cannot set the OpenGL context");
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140 }
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141 }
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142
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143 void SwapBuffer()
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144 {
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145 /**
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146 * "Rendered WebGL content is implicitly presented (displayed to
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147 * the user) on the canvas when the event handler that renders with
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148 * WebGL returns back to the browser event loop."
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149 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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150 *
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151 * Could call "emscripten_webgl_commit_frame()" if
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152 * "explicitSwapControl" option were set to "true".
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153 **/
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154 }
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155
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156 unsigned int GetCanvasWidth() const
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157 {
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158 return canvasWidth_;
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159 }
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160
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161 unsigned int GetCanvasHeight() const
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162 {
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163 return canvasHeight_;
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164 }
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165
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166 void UpdateSize()
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167 {
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168 double w, h;
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169 emscripten_get_element_css_size(canvas_.c_str(), &w, &h);
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170
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171 /**
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172 * Emscripten has the function emscripten_get_element_css_size()
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173 * to query the width and height of a named HTML element. I'm
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174 * calling this first to get the initial size of the canvas DOM
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175 * element, and then call emscripten_set_canvas_size() to
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176 * initialize the framebuffer size of the canvas to the same
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177 * size as its DOM element.
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178 * https://floooh.github.io/2017/02/22/emsc-html.html
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179 **/
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180
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181 if (w <= 0 ||
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182 h <= 0)
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183 {
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184 canvasWidth_ = 0;
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185 canvasHeight_ = 0;
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186 }
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187 else
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188 {
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189 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w));
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190 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h));
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191 }
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192
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193 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth_, canvasHeight_);
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194 }
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195 };
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196
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197
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198 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvas) :
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199 pimpl_(new PImpl(canvas))
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200 {
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201 }
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202
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203 //bool WebAssemblyOpenGLContext::TryRecreate()
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204 //{
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205 // // LOG(ERROR) << "WebAssemblyOpenGLContext::TryRecreate() trying to recreate context";
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206 // try
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207 // {
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208 // std::string canvasId = GetCanvasIdentifier();
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209 // pimpl_.reset(new PImpl(canvasId));
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210
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211 // // no exception does not mean the context is fully
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212 // // functional! Most probably, if we have >= than 16
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213 // // contexts, context wil remain lost for some time
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214 // bool lost = IsContextLost();
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215 // if (lost) {
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216 // // LOG(ERROR) << "WebAssemblyOpenGLContext::TryRecreate() context is still lost!";
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217 // return false;
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218 // } else {
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219 // return true;
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220 // }
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221 // }
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222 // catch (const Orthanc::OrthancException& e)
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223 // {
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224 // if (e.HasDetails())
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225 // {
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226 // LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::TryRecreate: " << e.What() << " Details: " << e.GetDetails();
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227 // }
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228 // else
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229 // {
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230 // LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::TryRecreate: " << e.What();
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231 // }
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232 // return false;
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233 // }
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234 // catch (const std::exception& e)
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235 // {
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236 // LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::TryRecreate: " << e.what();
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237 // return false;
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238 // }
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239 // catch (...)
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240 // {
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241 // LOG(ERROR) << "Unknown exception WebAssemblyOpenGLContext::in TryRecreate";
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242 // return false;
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243 // }
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244 //}
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245
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246 bool WebAssemblyOpenGLContext::IsContextLost()
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247 {
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248 return pimpl_->IsContextLost();
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249 }
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250
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251 void WebAssemblyOpenGLContext::RestoreLostContext()
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252 {
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253 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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254 }
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255
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256 void WebAssemblyOpenGLContext::SetLostContext()
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257 {
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258 pimpl_->SetLostContext();
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259 }
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260
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261 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const
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262 {
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263 return pimpl_->DebugGetInternalContext();
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264 }
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265
616
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266 void WebAssemblyOpenGLContext::MakeCurrent()
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267 {
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268 assert(pimpl_.get() != NULL);
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269 pimpl_->MakeCurrent();
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270 }
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271
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272 void WebAssemblyOpenGLContext::SwapBuffer()
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273 {
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274 assert(pimpl_.get() != NULL);
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275 pimpl_->SwapBuffer();
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276 }
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277
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278 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const
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279 {
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280 assert(pimpl_.get() != NULL);
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281 return pimpl_->GetCanvasWidth();
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282 }
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283
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284 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const
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285 {
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286 assert(pimpl_.get() != NULL);
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287 return pimpl_->GetCanvasHeight();
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288 }
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289
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290 void WebAssemblyOpenGLContext::UpdateSize()
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291 {
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292 assert(pimpl_.get() != NULL);
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293 pimpl_->UpdateSize();
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294 }
617
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295
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296 const std::string& WebAssemblyOpenGLContext::GetCanvasIdentifier() const
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297 {
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298 assert(pimpl_.get() != NULL);
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299 return pimpl_->GetCanvasIdentifier();
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300 }
616
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301 }
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302 }