Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/OpenGL/WebAssemblyOpenGLContext.cpp @ 1578:1f812f4c95be

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 24 Sep 2020 17:20:36 +0200
parents 92fca2b3ba3d
children
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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) 2017-2020 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 "../StoneException.h"
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25
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26 #include <OrthancException.h>
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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 canvasSelector_;
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41 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_;
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42 bool isContextLost_;
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44 public:
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45 explicit PImpl(const std::string& canvasSelector) :
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46 canvasSelector_(canvasSelector),
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47 isContextLost_(false)
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48 {
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49 // Context configuration
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50 EmscriptenWebGLContextAttributes attr;
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51 emscripten_webgl_init_context_attributes(&attr);
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52
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53 // The next line might be necessary to print using
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54 // WebGL. Sometimes, if set to "false" (the default value),
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55 // the canvas was rendered as a fully white or black
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56 // area. UNCONFIRMED.
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57 attr.preserveDrawingBuffer = true;
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58
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59 context_ = emscripten_webgl_create_context(canvasSelector.c_str(), &attr);
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60 if (context_ == 0)
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61 {
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62 std::string message("Cannot create an OpenGL context for the element with the following CSS selector: \"");
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63 message += canvasSelector;
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64 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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65 LOG(ERROR) << message;
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66 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message);
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67 }
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68 }
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69
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70 void* DebugGetInternalContext() const
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71 {
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72 return reinterpret_cast<void*>(context_);
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73 }
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74
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75 bool IsContextLost()
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76 {
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77 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec;
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78 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0);
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79 isContextLost_ = apiFlag;
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80 return isContextLost_;
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81 }
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82
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83 void SetLostContext()
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84 {
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85 isContextLost_ = true;
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86 }
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87
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88 ~PImpl()
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89 {
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90 try
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91 {
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92 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_);
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93 if (result != EMSCRIPTEN_RESULT_SUCCESS)
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94 {
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95 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result;
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96 }
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97 }
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98 catch (const Orthanc::OrthancException& e)
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99 {
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100 if (e.HasDetails())
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101 {
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102 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails();
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103 }
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104 else
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105 {
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106 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What();
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107 }
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108 }
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109 catch (const std::exception& e)
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110 {
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111 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what();
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112 }
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113 catch (...)
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114 {
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115 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl";
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116 }
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117 }
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118
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119 const std::string& GetCanvasSelector() const
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120 {
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121 return canvasSelector_;
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122 }
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123
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124 void MakeCurrent()
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125 {
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126 if (IsContextLost())
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127 {
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128 LOG(ERROR) << "MakeCurrent() called on lost context " << context_;
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129 throw StoneException(ErrorCode_WebGLContextLost);
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130 }
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131
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132 if (emscripten_is_webgl_context_lost(context_))
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133 {
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134 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_;
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135 SetLostContext();
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136 throw StoneException(ErrorCode_WebGLContextLost);
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137 }
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138
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139 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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140 {
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141 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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142 "Cannot set the OpenGL context");
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143 }
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144 }
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145
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146 void SwapBuffer()
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147 {
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148 /**
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149 * "Rendered WebGL content is implicitly presented (displayed to
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150 * the user) on the canvas when the event handler that renders with
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151 * WebGL returns back to the browser event loop."
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152 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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153 *
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154 * Could call "emscripten_webgl_commit_frame()" if
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155 * "explicitSwapControl" option were set to "true".
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156 **/
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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 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) :
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162 pimpl_(new PImpl(canvasSelector))
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163 {
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164 }
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165
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166 bool WebAssemblyOpenGLContext::IsContextLost()
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167 {
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168 return pimpl_->IsContextLost();
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169 }
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170
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171 void WebAssemblyOpenGLContext::SetLostContext()
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172 {
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173 pimpl_->SetLostContext();
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174 }
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175
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176 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const
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177 {
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178 return pimpl_->DebugGetInternalContext();
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179 }
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180
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181 void WebAssemblyOpenGLContext::MakeCurrent()
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182 {
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183 assert(pimpl_.get() != NULL);
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184 pimpl_->MakeCurrent();
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185 }
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186
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187 void WebAssemblyOpenGLContext::SwapBuffer()
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188 {
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189 assert(pimpl_.get() != NULL);
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190 pimpl_->SwapBuffer();
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191 }
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192
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193 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const
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194 {
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195 assert(pimpl_.get() != NULL);
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196 return pimpl_->GetCanvasSelector();
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197 }
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198 }
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199 }