Mercurial > hg > orthanc-stone

annotate Framework/OpenGL/WebAssemblyOpenGLContext.cpp @ 1455:30deba7bc8e2

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simplifying include_directories
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 11 Jun 2020 20:54:01 +0200
parents 1b8e37770d78
children 5c96bf3f1d32
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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 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& canvasSelector)
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48 : canvasSelector_(canvasSelector)
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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(canvasSelector.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 the element with the following CSS selector: \"");
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59 message += canvasSelector;
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60 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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61 LOG(ERROR) << message;
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62 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message);
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63 }
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64
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65 UpdateSize();
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66 }
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67
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68 void* DebugGetInternalContext() const
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69 {
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70 return reinterpret_cast<void*>(context_);
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71 }
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72
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73 bool IsContextLost()
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74 {
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75 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec;
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76 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0);
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77 isContextLost_ = apiFlag;
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78 return isContextLost_;
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79 }
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80
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81 void SetLostContext()
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82 {
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83 isContextLost_ = true;
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84 }
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85
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86 ~PImpl()
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87 {
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88 try
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89 {
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90 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_);
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91 if (result != EMSCRIPTEN_RESULT_SUCCESS)
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92 {
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93 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result;
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94 }
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95 }
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96 catch (const Orthanc::OrthancException& e)
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97 {
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98 if (e.HasDetails())
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99 {
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100 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails();
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101 }
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102 else
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103 {
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104 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What();
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105 }
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106 }
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107 catch (const std::exception& e)
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108 {
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109 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what();
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110 }
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111 catch (...)
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112 {
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113 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl";
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114 }
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115 }
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116
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117 const std::string& GetCanvasSelector() const
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118 {
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119 return canvasSelector_;
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120 }
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121
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122 void MakeCurrent()
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123 {
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124 if (IsContextLost())
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125 {
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126 LOG(ERROR) << "MakeCurrent() called on lost context " << context_;
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127 throw StoneException(ErrorCode_WebGLContextLost);
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128 }
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129
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130 if (emscripten_is_webgl_context_lost(context_))
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131 {
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132 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_;
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133 SetLostContext();
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134 throw StoneException(ErrorCode_WebGLContextLost);
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135 }
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136
616
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137 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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138 {
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139 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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140 "Cannot set the OpenGL context");
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141 }
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142 }
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143
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144 void SwapBuffer()
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145 {
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146 /**
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147 * "Rendered WebGL content is implicitly presented (displayed to
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148 * the user) on the canvas when the event handler that renders with
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149 * WebGL returns back to the browser event loop."
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150 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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151 *
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152 * Could call "emscripten_webgl_commit_frame()" if
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153 * "explicitSwapControl" option were set to "true".
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154 **/
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155 }
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156
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157 unsigned int GetCanvasWidth() const
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158 {
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159 return canvasWidth_;
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160 }
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161
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162 unsigned int GetCanvasHeight() const
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163 {
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164 return canvasHeight_;
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165 }
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166
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167 void UpdateSize()
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168 {
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169 double w, h;
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170 emscripten_get_element_css_size(canvasSelector_.c_str(), &w, &h);
616
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171
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172 /**
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173 * Emscripten has the function emscripten_get_element_css_size()
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174 * to query the width and height of a named HTML element. I'm
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175 * calling this first to get the initial size of the canvas DOM
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176 * element, and then call emscripten_set_canvas_size() to
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177 * initialize the framebuffer size of the canvas to the same
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178 * size as its DOM element.
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179 * https://floooh.github.io/2017/02/22/emsc-html.html
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180 **/
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181
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182 if (w <= 0 ||
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183 h <= 0)
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184 {
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185 canvasWidth_ = 0;
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186 canvasHeight_ = 0;
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187 }
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188 else
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189 {
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190 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w));
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191 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h));
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192 }
997
d6b83ee3a950 fix WebAssemblyOpenGLViewport::UpdateSize()
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193
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194 emscripten_set_canvas_element_size(canvasSelector_.c_str(), canvasWidth_, canvasHeight_);
616
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195 }
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196 };
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197
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198
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199 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) :
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200 pimpl_(new PImpl(canvasSelector))
616
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201 {
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202 }
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203
956
a7351ad54960 Made IsContextLost automatically set the flag by checking with the emscripten
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diff changeset
204 bool WebAssemblyOpenGLContext::IsContextLost()
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205 {
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206 return pimpl_->IsContextLost();
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207 }
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208
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209 void WebAssemblyOpenGLContext::SetLostContext()
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210 {
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211 pimpl_->SetLostContext();
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212 }
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213
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diff changeset
214 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const
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215 {
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216 return pimpl_->DebugGetInternalContext();
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217 }
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218
616
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219 void WebAssemblyOpenGLContext::MakeCurrent()
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220 {
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221 assert(pimpl_.get() != NULL);
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222 pimpl_->MakeCurrent();
97926984d5d0 WebAssembly sample using Scene2D
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223 }
97926984d5d0 WebAssembly sample using Scene2D
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224
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225 void WebAssemblyOpenGLContext::SwapBuffer()
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226 {
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227 assert(pimpl_.get() != NULL);
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228 pimpl_->SwapBuffer();
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229 }
97926984d5d0 WebAssembly sample using Scene2D
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230
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231 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const
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232 {
97926984d5d0 WebAssembly sample using Scene2D
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233 assert(pimpl_.get() != NULL);
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234 return pimpl_->GetCanvasWidth();
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235 }
97926984d5d0 WebAssembly sample using Scene2D
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236
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237 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const
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238 {
97926984d5d0 WebAssembly sample using Scene2D
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239 assert(pimpl_.get() != NULL);
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240 return pimpl_->GetCanvasHeight();
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241 }
97926984d5d0 WebAssembly sample using Scene2D
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242
97926984d5d0 WebAssembly sample using Scene2D
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243 void WebAssemblyOpenGLContext::UpdateSize()
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244 {
97926984d5d0 WebAssembly sample using Scene2D
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245 assert(pimpl_.get() != NULL);
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246 pimpl_->UpdateSize();
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247 }
617
7efa2543699d simplification
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248
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249 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const
617
7efa2543699d simplification
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250 {
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diff changeset
251 assert(pimpl_.get() != NULL);
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252 return pimpl_->GetCanvasSelector();
617
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253 }
616
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254 }
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255 }