Mercurial > hg > orthanc-stone

annotate Applications/Platforms/WebAssembly/WebAssemblyOpenGLContext.cpp @ 1739:9ac2a65d4172

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upgrade to year 2021
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 06 Jan 2021 17:50:00 +0100
parents 59f95b9ea858
children 3889ae96d2e9
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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) 2017-2021 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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22 #include "WebAssemblyOpenGLContext.h"
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23
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24 #include "../../../OrthancStone/Sources/StoneException.h"
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25
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26 #include <Logging.h>
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27 #include <OrthancException.h>
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29 #include <emscripten/html5.h>
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30 #include <emscripten/em_asm.h>
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31
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32 #include <boost/math/special_functions/round.hpp>
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33
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34 namespace OrthancStone
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35 {
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36 namespace OpenGL
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37 {
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38 class WebAssemblyOpenGLContext::PImpl
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39 {
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40 private:
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41 std::string canvasSelector_;
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42 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_;
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43 bool isContextLost_;
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45 public:
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46 explicit PImpl(const std::string& canvasSelector) :
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47 canvasSelector_(canvasSelector),
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48 isContextLost_(false)
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49 {
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50 // Context configuration
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51 EmscriptenWebGLContextAttributes attr;
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52 emscripten_webgl_init_context_attributes(&attr);
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53
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54 // The next line might be necessary to print using
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55 // WebGL. Sometimes, if set to "false" (the default value),
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56 // the canvas was rendered as a fully white or black
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57 // area. UNCONFIRMED.
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58 attr.preserveDrawingBuffer = true;
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59
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60 context_ = emscripten_webgl_create_context(canvasSelector.c_str(), &attr);
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61 if (context_ == 0)
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62 {
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63 std::string message("Cannot create an OpenGL context for the element with the following CSS selector: \"");
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64 message += canvasSelector;
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65 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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66 LOG(ERROR) << message;
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67 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message);
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68 }
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69 }
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70
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71 void* DebugGetInternalContext() const
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72 {
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73 return reinterpret_cast<void*>(context_);
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74 }
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75
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76 bool IsContextLost()
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77 {
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78 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec;
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79 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0);
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80 isContextLost_ = apiFlag;
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81 return isContextLost_;
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82 }
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83
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84 void SetLostContext()
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85 {
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86 isContextLost_ = true;
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87 }
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88
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89 ~PImpl()
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90 {
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91 try
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92 {
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93 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_);
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94 if (result != EMSCRIPTEN_RESULT_SUCCESS)
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95 {
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96 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result;
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97 }
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98 }
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99 catch (const Orthanc::OrthancException& e)
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100 {
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101 if (e.HasDetails())
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102 {
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103 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails();
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104 }
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105 else
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106 {
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107 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What();
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108 }
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109 }
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110 catch (const std::exception& e)
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111 {
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112 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what();
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113 }
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114 catch (...)
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115 {
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116 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl";
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117 }
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118 }
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119
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120 const std::string& GetCanvasSelector() const
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121 {
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122 return canvasSelector_;
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123 }
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124
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125 void MakeCurrent()
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126 {
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127 if (IsContextLost())
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128 {
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129 LOG(ERROR) << "MakeCurrent() called on lost context " << context_;
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130 throw StoneException(ErrorCode_WebGLContextLost);
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131 }
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132
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133 if (emscripten_is_webgl_context_lost(context_))
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134 {
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135 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_;
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136 SetLostContext();
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137 throw StoneException(ErrorCode_WebGLContextLost);
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138 }
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139
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140 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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141 {
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142 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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143 "Cannot set the OpenGL context");
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144 }
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145 }
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146
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147 void SwapBuffer()
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148 {
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149 /**
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150 * "Rendered WebGL content is implicitly presented (displayed to
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151 * the user) on the canvas when the event handler that renders with
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152 * WebGL returns back to the browser event loop."
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153 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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154 *
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155 * Could call "emscripten_webgl_commit_frame()" if
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156 * "explicitSwapControl" option were set to "true".
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157 **/
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158 }
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159 };
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160
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161
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162 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) :
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163 pimpl_(new PImpl(canvasSelector))
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164 {
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165 }
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166
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167 bool WebAssemblyOpenGLContext::IsContextLost()
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168 {
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169 return pimpl_->IsContextLost();
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170 }
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171
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172 void WebAssemblyOpenGLContext::SetLostContext()
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173 {
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174 pimpl_->SetLostContext();
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175 }
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176
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177 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const
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178 {
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179 return pimpl_->DebugGetInternalContext();
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180 }
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181
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182 void WebAssemblyOpenGLContext::MakeCurrent()
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183 {
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184 assert(pimpl_.get() != NULL);
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185 pimpl_->MakeCurrent();
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186 }
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187
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188 void WebAssemblyOpenGLContext::SwapBuffer()
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189 {
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190 assert(pimpl_.get() != NULL);
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191 pimpl_->SwapBuffer();
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192 }
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193
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194 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const
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195 {
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196 assert(pimpl_.get() != NULL);
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197 return pimpl_->GetCanvasSelector();
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198 }
616
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199 }
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200 }