Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Platforms/WebAssembly/WebAssemblyOpenGLContext.cpp @ 2078:fdb012c86a75 deep-learning

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integration mainline->deep-learning
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 12 Jul 2023 21:21:11 +0200
parents e5c812a36746 07964689cb0b
children de049fd88697
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "WebAssemblyOpenGLContext.h"
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25
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26 #include "../../StoneException.h"
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27
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28 #include <Logging.h>
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29 #include <OrthancException.h>
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30
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31 #include <emscripten/html5.h>
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32 #include <emscripten/em_asm.h>
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33
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34 #include <boost/math/special_functions/round.hpp>
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35
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36 namespace OrthancStone
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37 {
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38 namespace OpenGL
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39 {
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40 class WebAssemblyOpenGLContext::PImpl
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41 {
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42 private:
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43 std::string canvasSelector_;
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44 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_;
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45 bool isContextLost_;
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46
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47 public:
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48 explicit PImpl(const std::string& canvasSelector,
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49 Version version) :
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50 canvasSelector_(canvasSelector),
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51 isContextLost_(false)
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52 {
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53 // Context configuration
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54 EmscriptenWebGLContextAttributes attr;
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55 emscripten_webgl_init_context_attributes(&attr);
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56
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57 switch (version)
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58 {
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59 case Version_WebGL1:
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60 break;
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61
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62 case Version_WebGL2:
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63 attr.majorVersion = 2;
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64 attr.minorVersion = 0;
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65 break;
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66
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67 default:
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68 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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69 }
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70
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71 // The next line might be necessary to print using
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72 // WebGL. Sometimes, if set to "false" (the default value),
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73 // the canvas was rendered as a fully white or black
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74 // area. UNCONFIRMED.
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75 attr.preserveDrawingBuffer = true;
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76
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77 context_ = emscripten_webgl_create_context(canvasSelector.c_str(), &attr);
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78 if (context_ == 0)
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79 {
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80 std::string message("Cannot create an OpenGL context for the element with the following CSS selector: \"");
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81 message += canvasSelector;
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82 message += "\" Please make sure the -s DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=1 flag has been passed to Emscripten when building.";
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83 LOG(ERROR) << message;
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84 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message);
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85 }
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86 }
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87
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88 void* DebugGetInternalContext() const
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89 {
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90 return reinterpret_cast<void*>(context_);
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91 }
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92
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93 bool IsContextLost()
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94 {
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95 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec;
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96 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0);
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97 isContextLost_ = apiFlag;
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98 return isContextLost_;
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99 }
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100
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101 void SetLostContext()
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102 {
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103 isContextLost_ = true;
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104 }
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105
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106 ~PImpl()
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107 {
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108 try
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109 {
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110 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_);
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111 if (result != EMSCRIPTEN_RESULT_SUCCESS)
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112 {
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113 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result;
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114 }
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115 }
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116 catch (const Orthanc::OrthancException& e)
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117 {
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118 if (e.HasDetails())
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119 {
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120 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails();
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121 }
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122 else
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123 {
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124 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What();
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125 }
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126 }
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127 catch (const std::exception& e)
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128 {
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129 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what();
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130 }
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131 catch (...)
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132 {
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133 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl";
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134 }
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135 }
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136
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137 const std::string& GetCanvasSelector() const
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138 {
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139 return canvasSelector_;
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140 }
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141
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142 void MakeCurrent()
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143 {
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144 if (IsContextLost())
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145 {
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146 LOG(ERROR) << "MakeCurrent() called on lost context " << context_;
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147 throw StoneException(ErrorCode_WebGLContextLost);
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148 }
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149
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150 if (emscripten_is_webgl_context_lost(context_))
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151 {
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152 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_;
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153 SetLostContext();
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154 throw StoneException(ErrorCode_WebGLContextLost);
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155 }
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156
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157 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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158 {
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159 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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160 "Cannot set the OpenGL context");
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161 }
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162 }
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163
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164 void SwapBuffer()
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165 {
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166 /**
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167 * "Rendered WebGL content is implicitly presented (displayed to
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168 * the user) on the canvas when the event handler that renders with
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169 * WebGL returns back to the browser event loop."
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170 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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171 *
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172 * Could call "emscripten_webgl_commit_frame()" if
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173 * "explicitSwapControl" option were set to "true".
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174 **/
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175 }
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176 };
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177
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178
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179 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) :
2045
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180 pimpl_(new PImpl(canvasSelector, Version_WebGL1))
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181 {
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182 }
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183
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184 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector,
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185 Version version) :
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186 pimpl_(new PImpl(canvasSelector, version))
1899
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187 {
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188 }
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189
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190 bool WebAssemblyOpenGLContext::IsContextLost()
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191 {
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192 return pimpl_->IsContextLost();
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193 }
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194
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195 void WebAssemblyOpenGLContext::SetLostContext()
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196 {
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197 pimpl_->SetLostContext();
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198 }
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199
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200 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const
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201 {
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202 return pimpl_->DebugGetInternalContext();
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203 }
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204
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205 void WebAssemblyOpenGLContext::MakeCurrent()
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206 {
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207 assert(pimpl_.get() != NULL);
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208 pimpl_->MakeCurrent();
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209 }
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210
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211 void WebAssemblyOpenGLContext::SwapBuffer()
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212 {
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213 assert(pimpl_.get() != NULL);
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214 pimpl_->SwapBuffer();
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215 }
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216
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217 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const
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218 {
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219 assert(pimpl_.get() != NULL);
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220 return pimpl_->GetCanvasSelector();
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221 }
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222 }
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223 }