Mercurial > hg > orthanc-stone

annotate Framework/OpenGL/WebAssemblyOpenGLContext.cpp @ 891:0aff28f15ea2

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new abstraction: IViewport
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 10 Jul 2019 18:18:42 +0200
parents 7efa2543699d
children f557b18d287f
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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 #include <Core/OrthancException.h>
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25
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26 #include <emscripten/html5.h>
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27 #include <boost/math/special_functions/round.hpp>
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28
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29 namespace OrthancStone
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30 {
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31 namespace OpenGL
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32 {
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33 class WebAssemblyOpenGLContext::PImpl
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34 {
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35 private:
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36 std::string canvas_;
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37 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_;
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38 unsigned int canvasWidth_;
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39 unsigned int canvasHeight_;
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40
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41 public:
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42 PImpl(const std::string& canvas) :
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43 canvas_(canvas)
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44 {
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45 // Context configuration
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46 EmscriptenWebGLContextAttributes attr;
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47 emscripten_webgl_init_context_attributes(&attr);
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48
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49 context_ = emscripten_webgl_create_context(canvas.c_str(), &attr);
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50 if (context_ < 0)
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51 {
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52 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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53 "Cannot create an OpenGL context for canvas: " + canvas);
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54 }
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55
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56 UpdateSize();
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57 }
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58
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59 ~PImpl()
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60 {
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61 emscripten_webgl_destroy_context(context_);
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62 }
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63
617
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64 const std::string& GetCanvasIdentifier() const
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65 {
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66 return canvas_;
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67 }
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68
616
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69 void MakeCurrent()
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70 {
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71 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS)
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72 {
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73 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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74 "Cannot set the OpenGL context");
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75 }
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76 }
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77
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78 void SwapBuffer()
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79 {
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80 /**
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81 * "Rendered WebGL content is implicitly presented (displayed to
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82 * the user) on the canvas when the event handler that renders with
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83 * WebGL returns back to the browser event loop."
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84 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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85 *
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86 * Could call "emscripten_webgl_commit_frame()" if
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87 * "explicitSwapControl" option were set to "true".
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88 **/
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89 }
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90
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91 unsigned int GetCanvasWidth() const
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92 {
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93 return canvasWidth_;
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94 }
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95
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96 unsigned int GetCanvasHeight() const
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97 {
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98 return canvasHeight_;
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99 }
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100
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101 void UpdateSize()
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102 {
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103 double w, h;
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104 emscripten_get_element_css_size(canvas_.c_str(), &w, &h);
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105
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106 /**
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107 * Emscripten has the function emscripten_get_element_css_size()
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108 * to query the width and height of a named HTML element. I'm
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109 * calling this first to get the initial size of the canvas DOM
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110 * element, and then call emscripten_set_canvas_size() to
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111 * initialize the framebuffer size of the canvas to the same
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112 * size as its DOM element.
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113 * https://floooh.github.io/2017/02/22/emsc-html.html
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114 **/
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115
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116 if (w <= 0 ||
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117 h <= 0)
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118 {
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119 canvasWidth_ = 0;
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120 canvasHeight_ = 0;
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121 }
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122 else
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123 {
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124 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w));
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125 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h));
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126 }
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127
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128 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth_, canvasHeight_);
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129 }
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130 };
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131
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132
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133 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvas) :
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134 pimpl_(new PImpl(canvas))
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135 {
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136 }
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137
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138 void WebAssemblyOpenGLContext::MakeCurrent()
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139 {
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140 assert(pimpl_.get() != NULL);
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141 pimpl_->MakeCurrent();
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142 }
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143
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144
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145 void WebAssemblyOpenGLContext::SwapBuffer()
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146 {
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147 assert(pimpl_.get() != NULL);
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148 pimpl_->SwapBuffer();
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149 }
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150
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151 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const
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152 {
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153 assert(pimpl_.get() != NULL);
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154 return pimpl_->GetCanvasWidth();
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155 }
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156
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157 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const
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158 {
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159 assert(pimpl_.get() != NULL);
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160 return pimpl_->GetCanvasHeight();
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161 }
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162
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163 void WebAssemblyOpenGLContext::UpdateSize()
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164 {
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165 assert(pimpl_.get() != NULL);
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166 pimpl_->UpdateSize();
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167 }
617
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168
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169 const std::string& WebAssemblyOpenGLContext::GetCanvasIdentifier() const
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170 {
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171 assert(pimpl_.get() != NULL);
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172 return pimpl_->GetCanvasIdentifier();
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173 }
616
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174 }
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175 }