Mercurial > hg > orthanc-stone

annotate Framework/OpenGL/WebAssemblyOpenGLContext.cpp @ 947:1091b2adeb5a toa2019081001

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Fixed animation frame stopping when returning false + big work on the OpenGL objects to make them lost context-safe + debug code to forcefully tag a context as lost + debug macros
author Benjamin Golinvaux <bgo@osimis.io>
date Sat, 10 Aug 2019 13:07:31 +0200
parents 2db3ef713664
children a7351ad54960
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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) 2017-2019 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 <Core/OrthancException.h>
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27
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28 #include <emscripten/html5.h>
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29 #include <emscripten/em_asm.h>
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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 canvas_;
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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& canvas)
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48 : canvas_(canvas)
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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(canvas.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 canvas: ");
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59 message += canvas;
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60 LOG(ERROR) << message;
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61 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message);
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62 }
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63
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64 UpdateSize();
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65 }
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66
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67 void* DebugGetInternalContext() const
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68 {
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69 return reinterpret_cast<void*>(context_);
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70 }
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71
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72 bool IsContextLost() const
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73 {
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74 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0);
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75 bool ownFlag = isContextLost_;
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76 if (ownFlag != apiFlag)
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77 {
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78 LOG(WARNING) << "Context loss, according to emscripten, is: " << apiFlag << " | while, according to internal state, is: " << ownFlag;
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79 }
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80 return ownFlag | apiFlag;
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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 emscripten_webgl_destroy_context(context_);
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91 }
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92
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93 const std::string& GetCanvasIdentifier() const
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94 {
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95 return canvas_;
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96 }
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97
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98 void MakeCurrent()
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99 {
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100 if (IsContextLost())
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101 {
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102 LOG(ERROR) << "MakeCurrent() called on lost context " << context_;
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103 throw OpenGLContextLostException(reinterpret_cast<void*>(context_));
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104 }
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105
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106 if (emscripten_is_webgl_context_lost(context_))
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107 {
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108 LOG(ERROR) << "OpenGL context has been lost for canvas: " << canvas_;
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109 SetLostContext();
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110 throw OpenGLContextLostException(reinterpret_cast<void*>(context_));
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111 }
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112
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113 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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114 {
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115 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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116 "Cannot set the OpenGL context");
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117 }
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118 }
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119
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120 void SwapBuffer()
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121 {
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122 /**
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123 * "Rendered WebGL content is implicitly presented (displayed to
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124 * the user) on the canvas when the event handler that renders with
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125 * WebGL returns back to the browser event loop."
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126 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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127 *
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128 * Could call "emscripten_webgl_commit_frame()" if
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129 * "explicitSwapControl" option were set to "true".
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130 **/
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131 }
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132
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133 unsigned int GetCanvasWidth() const
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134 {
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135 return canvasWidth_;
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136 }
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137
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138 unsigned int GetCanvasHeight() const
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139 {
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140 return canvasHeight_;
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141 }
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142
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143 void UpdateSize()
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144 {
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145 double w, h;
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146 emscripten_get_element_css_size(canvas_.c_str(), &w, &h);
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147
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148 /**
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149 * Emscripten has the function emscripten_get_element_css_size()
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150 * to query the width and height of a named HTML element. I'm
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151 * calling this first to get the initial size of the canvas DOM
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152 * element, and then call emscripten_set_canvas_size() to
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153 * initialize the framebuffer size of the canvas to the same
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154 * size as its DOM element.
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155 * https://floooh.github.io/2017/02/22/emsc-html.html
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156 **/
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157
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158 if (w <= 0 ||
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159 h <= 0)
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160 {
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161 canvasWidth_ = 0;
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162 canvasHeight_ = 0;
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163 }
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164 else
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165 {
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166 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w));
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167 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h));
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168 }
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169
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170 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth_, canvasHeight_);
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171 }
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172 };
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173
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174
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175 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvas) :
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176 pimpl_(new PImpl(canvas))
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177 {
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178 }
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179
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180 bool WebAssemblyOpenGLContext::IsContextLost() const
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181 {
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182 return pimpl_->IsContextLost();
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183 }
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184
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185 void WebAssemblyOpenGLContext::RestoreLostContext()
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186 {
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187 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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188 }
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189
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190 void WebAssemblyOpenGLContext::SetLostContext()
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191 {
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192 pimpl_->SetLostContext();
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193 }
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194
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195 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const
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196 {
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197 return pimpl_->DebugGetInternalContext();
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198 }
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199
616
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200 void WebAssemblyOpenGLContext::MakeCurrent()
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201 {
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202 assert(pimpl_.get() != NULL);
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203 pimpl_->MakeCurrent();
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204 }
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205
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206 void WebAssemblyOpenGLContext::SwapBuffer()
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207 {
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208 assert(pimpl_.get() != NULL);
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209 pimpl_->SwapBuffer();
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210 }
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211
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212 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const
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213 {
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214 assert(pimpl_.get() != NULL);
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215 return pimpl_->GetCanvasWidth();
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216 }
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217
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218 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const
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219 {
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220 assert(pimpl_.get() != NULL);
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221 return pimpl_->GetCanvasHeight();
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222 }
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223
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224 void WebAssemblyOpenGLContext::UpdateSize()
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225 {
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226 assert(pimpl_.get() != NULL);
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227 pimpl_->UpdateSize();
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228 }
617
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229
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230 const std::string& WebAssemblyOpenGLContext::GetCanvasIdentifier() const
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231 {
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232 assert(pimpl_.get() != NULL);
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233 return pimpl_->GetCanvasIdentifier();
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234 }
616
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235 }
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236 }