Mercurial > hg > orthanc-stone

annotate Framework/OpenGL/WebAssemblyOpenGLContext.cpp @ 617:7efa2543699d

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simplification
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 02 May 2019 18:21:59 +0200
parents 97926984d5d0
children 0aff28f15ea2
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616
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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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20
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21
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22 #include "WebAssemblyOpenGLContext.h"
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23
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24 #if ORTHANC_ENABLE_WASM == 1
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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 <boost/math/special_functions/round.hpp>
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30
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31 namespace OrthancStone
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32 {
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33 namespace OpenGL
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34 {
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35 class WebAssemblyOpenGLContext::PImpl
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36 {
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37 private:
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38 std::string canvas_;
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39 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_;
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40 unsigned int canvasWidth_;
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41 unsigned int canvasHeight_;
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42
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43 public:
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44 PImpl(const std::string& canvas) :
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45 canvas_(canvas)
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46 {
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47 // Context configuration
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48 EmscriptenWebGLContextAttributes attr;
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49 emscripten_webgl_init_context_attributes(&attr);
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50
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51 context_ = emscripten_webgl_create_context(canvas.c_str(), &attr);
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52 if (context_ < 0)
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53 {
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54 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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55 "Cannot create an OpenGL context for canvas: " + canvas);
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56 }
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57
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58 UpdateSize();
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59 }
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60
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61 ~PImpl()
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62 {
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63 emscripten_webgl_destroy_context(context_);
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64 }
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65
617
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66 const std::string& GetCanvasIdentifier() const
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67 {
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68 return canvas_;
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69 }
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70
616
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71 void MakeCurrent()
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72 {
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73 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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74 {
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75 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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76 "Cannot set the OpenGL context");
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77 }
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78 }
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79
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80 void SwapBuffer()
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81 {
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82 /**
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83 * "Rendered WebGL content is implicitly presented (displayed to
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84 * the user) on the canvas when the event handler that renders with
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85 * WebGL returns back to the browser event loop."
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86 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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87 *
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88 * Could call "emscripten_webgl_commit_frame()" if
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89 * "explicitSwapControl" option were set to "true".
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90 **/
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91 }
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92
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93 unsigned int GetCanvasWidth() const
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94 {
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95 return canvasWidth_;
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96 }
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97
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98 unsigned int GetCanvasHeight() const
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99 {
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100 return canvasHeight_;
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101 }
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102
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103 void UpdateSize()
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104 {
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105 double w, h;
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106 emscripten_get_element_css_size(canvas_.c_str(), &w, &h);
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107
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108 /**
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109 * Emscripten has the function emscripten_get_element_css_size()
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110 * to query the width and height of a named HTML element. I'm
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111 * calling this first to get the initial size of the canvas DOM
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112 * element, and then call emscripten_set_canvas_size() to
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113 * initialize the framebuffer size of the canvas to the same
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114 * size as its DOM element.
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115 * https://floooh.github.io/2017/02/22/emsc-html.html
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116 **/
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117
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118 if (w <= 0 ||
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119 h <= 0)
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120 {
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121 canvasWidth_ = 0;
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122 canvasHeight_ = 0;
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123 }
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124 else
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125 {
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126 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w));
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127 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h));
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128 }
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129
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130 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth_, canvasHeight_);
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131 }
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132 };
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133
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134
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135 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvas) :
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136 pimpl_(new PImpl(canvas))
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137 {
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138 }
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139
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140 void WebAssemblyOpenGLContext::MakeCurrent()
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141 {
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142 assert(pimpl_.get() != NULL);
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143 pimpl_->MakeCurrent();
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144 }
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145
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146
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147 void WebAssemblyOpenGLContext::SwapBuffer()
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148 {
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149 assert(pimpl_.get() != NULL);
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150 pimpl_->SwapBuffer();
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151 }
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152
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153 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const
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154 {
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155 assert(pimpl_.get() != NULL);
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156 return pimpl_->GetCanvasWidth();
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157 }
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158
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159 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const
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160 {
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161 assert(pimpl_.get() != NULL);
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162 return pimpl_->GetCanvasHeight();
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163 }
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164
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165 void WebAssemblyOpenGLContext::UpdateSize()
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166 {
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167 assert(pimpl_.get() != NULL);
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168 pimpl_->UpdateSize();
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169 }
617
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170
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171 const std::string& WebAssemblyOpenGLContext::GetCanvasIdentifier() const
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172 {
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173 assert(pimpl_.get() != NULL);
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174 return pimpl_->GetCanvasIdentifier();
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175 }
616
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176 }
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177 }
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178
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179 #endif