Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Platforms/WebAssembly/WebAssemblyOpenGLContext.cpp @ 1901:184b0aeae1af

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fix build of sdl
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 29 Jan 2022 16:55:14 +0100
parents 917500c46fe0
children e5c812a36746 07964689cb0b
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 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 canvasSelector_(canvasSelector),
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50 isContextLost_(false)
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51 {
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52 // Context configuration
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53 EmscriptenWebGLContextAttributes attr;
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54 emscripten_webgl_init_context_attributes(&attr);
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55
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56 // The next line might be necessary to print using
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57 // WebGL. Sometimes, if set to "false" (the default value),
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58 // the canvas was rendered as a fully white or black
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59 // area. UNCONFIRMED.
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60 attr.preserveDrawingBuffer = true;
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61
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62 context_ = emscripten_webgl_create_context(canvasSelector.c_str(), &attr);
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63 if (context_ == 0)
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64 {
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65 std::string message("Cannot create an OpenGL context for the element with the following CSS selector: \"");
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66 message += canvasSelector;
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67 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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68 LOG(ERROR) << message;
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69 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message);
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70 }
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71 }
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72
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73 void* DebugGetInternalContext() const
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74 {
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75 return reinterpret_cast<void*>(context_);
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76 }
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77
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78 bool IsContextLost()
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79 {
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80 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec;
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81 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0);
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82 isContextLost_ = apiFlag;
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83 return isContextLost_;
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84 }
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85
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86 void SetLostContext()
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87 {
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88 isContextLost_ = true;
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89 }
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90
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91 ~PImpl()
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92 {
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93 try
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94 {
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95 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_);
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96 if (result != EMSCRIPTEN_RESULT_SUCCESS)
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97 {
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98 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result;
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99 }
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100 }
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101 catch (const Orthanc::OrthancException& e)
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102 {
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103 if (e.HasDetails())
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104 {
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105 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails();
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106 }
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107 else
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108 {
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109 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What();
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110 }
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111 }
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112 catch (const std::exception& e)
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113 {
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114 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what();
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115 }
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116 catch (...)
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117 {
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118 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl";
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119 }
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120 }
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121
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122 const std::string& GetCanvasSelector() const
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123 {
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124 return canvasSelector_;
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125 }
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126
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127 void MakeCurrent()
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128 {
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129 if (IsContextLost())
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130 {
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131 LOG(ERROR) << "MakeCurrent() called on lost context " << context_;
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132 throw StoneException(ErrorCode_WebGLContextLost);
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133 }
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134
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135 if (emscripten_is_webgl_context_lost(context_))
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136 {
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137 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_;
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138 SetLostContext();
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139 throw StoneException(ErrorCode_WebGLContextLost);
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140 }
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141
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142 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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143 {
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144 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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145 "Cannot set the OpenGL context");
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146 }
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147 }
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148
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149 void SwapBuffer()
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150 {
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151 /**
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152 * "Rendered WebGL content is implicitly presented (displayed to
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153 * the user) on the canvas when the event handler that renders with
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154 * WebGL returns back to the browser event loop."
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155 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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156 *
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157 * Could call "emscripten_webgl_commit_frame()" if
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158 * "explicitSwapControl" option were set to "true".
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159 **/
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160 }
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161 };
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162
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163
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164 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) :
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165 pimpl_(new PImpl(canvasSelector))
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166 {
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167 }
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168
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169 bool WebAssemblyOpenGLContext::IsContextLost()
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170 {
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171 return pimpl_->IsContextLost();
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172 }
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173
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174 void WebAssemblyOpenGLContext::SetLostContext()
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175 {
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176 pimpl_->SetLostContext();
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177 }
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178
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179 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const
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180 {
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181 return pimpl_->DebugGetInternalContext();
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182 }
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183
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184 void WebAssemblyOpenGLContext::MakeCurrent()
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185 {
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186 assert(pimpl_.get() != NULL);
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187 pimpl_->MakeCurrent();
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188 }
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189
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190 void WebAssemblyOpenGLContext::SwapBuffer()
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191 {
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192 assert(pimpl_.get() != NULL);
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193 pimpl_->SwapBuffer();
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194 }
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195
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196 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const
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197 {
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198 assert(pimpl_.get() != NULL);
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199 return pimpl_->GetCanvasSelector();
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200 }
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201 }
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202 }