Mercurial > hg > orthanc-stone
annotate Framework/Viewport/WebAssemblyViewport.cpp @ 942:685c9a2d115f
Added missing ORTHANC_OVERRIDE + preparation for lost GL context handling + stubs for GL context event handlers
author | Benjamin Golinvaux <bgo@osimis.io> |
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date | Mon, 05 Aug 2019 12:27:27 +0200 |
parents | a6c12fe88bcb |
children | 1091b2adeb5a |
rev | line source |
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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 "WebAssemblyViewport.h" |
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23 #include <emscripten/html5.h> |
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24 |
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25 namespace OrthancStone |
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26 { |
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27 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas) : |
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28 WebAssemblyViewport(canvas), |
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29 context_(canvas) |
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30 { |
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31 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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32 RegisterContextCallbacks(); |
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33 } |
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34 |
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35 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas, |
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36 boost::shared_ptr<Scene2D>& scene) : |
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37 WebAssemblyViewport(canvas, scene), |
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38 context_(canvas) |
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39 { |
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40 compositor_.reset(new OpenGLCompositor(context_, GetScene())); |
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41 RegisterContextCallbacks(); |
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42 } |
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43 |
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44 void WebAssemblyOpenGLViewport::UpdateSize() |
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45 { |
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46 context_.UpdateSize(); // First read the size of the canvas |
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47 compositor_->Refresh(); // Then refresh the content of the canvas |
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48 } |
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49 |
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50 /* |
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51 typedef EM_BOOL (*em_webgl_context_callback)(int eventType, const void *reserved, void *userData); |
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52 |
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53 EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED |
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54 |
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55 EMSCRIPTEN_RESULT emscripten_set_webglcontextlost_callback( |
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56 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback) |
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57 |
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58 EMSCRIPTEN_RESULT emscripten_set_webglcontextrestored_callback( |
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59 const char *target, void *userData, EM_BOOL useCapture, em_webgl_context_callback callback) |
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60 |
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61 */ |
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62 |
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63 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextLost_callback( |
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64 int eventType, const void* reserved, void* userData) |
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65 { |
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66 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST); |
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67 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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68 return viewport->OpenGLContextLost(); |
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69 } |
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70 |
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71 EM_BOOL WebAssemblyOpenGLViewport_OpenGLContextRestored_callback( |
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72 int eventType, const void* reserved, void* userData) |
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73 { |
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74 ORTHANC_ASSERT(eventType == EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED); |
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75 WebAssemblyOpenGLViewport* viewport = reinterpret_cast<WebAssemblyOpenGLViewport*>(userData); |
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76 return viewport->OpenGLContextRestored(); |
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77 } |
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78 |
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79 void WebAssemblyOpenGLViewport::RegisterContextCallbacks() |
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80 { |
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81 // TODO: what's the impact of userCapture=true ? |
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82 const char* canvasId = GetCanvasIdentifier().c_str(); |
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83 void* that = reinterpret_cast<void*>(this); |
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84 EMSCRIPTEN_RESULT status = EMSCRIPTEN_RESULT_SUCCESS; |
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85 |
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86 status = emscripten_set_webglcontextlost_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextLost_callback); |
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87 if (status != EMSCRIPTEN_RESULT_SUCCESS) |
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88 { |
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89 std::stringstream ss; |
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90 ss << "Error while calling emscripten_set_webglcontextlost_callback for: \"" << GetCanvasIdentifier() << "\""; |
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91 std::string msg = ss.str(); |
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92 LOG(ERROR) << msg; |
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93 ORTHANC_ASSERT(false, msg.c_str()); |
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94 } |
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95 status = emscripten_set_webglcontextrestored_callback(canvasId, that, true, WebAssemblyOpenGLViewport_OpenGLContextRestored_callback); |
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96 if (status != EMSCRIPTEN_RESULT_SUCCESS) |
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97 { |
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98 std::stringstream ss; |
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99 ss << "Error while calling emscripten_set_webglcontextrestored_callback for: \"" << GetCanvasIdentifier() << "\""; |
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100 std::string msg = ss.str(); |
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101 LOG(ERROR) << msg; |
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102 ORTHANC_ASSERT(false, msg.c_str()); |
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103 } |
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104 } |
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105 |
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106 bool WebAssemblyOpenGLViewport::OpenGLContextLost() |
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107 { |
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108 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextLost() for canvas: " << GetCanvasIdentifier(); |
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109 return false; |
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110 } |
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111 |
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112 bool WebAssemblyOpenGLViewport::OpenGLContextRestored() |
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113 { |
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114 LOG(ERROR) << "WebAssemblyOpenGLViewport::OpenGLContextRestored() for canvas: " << GetCanvasIdentifier(); |
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115 return false; |
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116 } |
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117 |
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118 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas) : |
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119 WebAssemblyViewport(canvas), |
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120 canvas_(canvas), |
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121 compositor_(GetScene(), 1024, 768) |
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122 { |
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123 } |
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124 |
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125 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas, |
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126 boost::shared_ptr<Scene2D>& scene) : |
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127 WebAssemblyViewport(canvas, scene), |
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128 canvas_(canvas), |
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129 compositor_(GetScene(), 1024, 768) |
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130 { |
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131 } |
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132 |
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133 void WebAssemblyCairoViewport::UpdateSize() |
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134 { |
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135 LOG(INFO) << "updating cairo viewport size"; |
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136 double w, h; |
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137 emscripten_get_element_css_size(canvas_.c_str(), &w, &h); |
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138 |
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139 /** |
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140 * Emscripten has the function emscripten_get_element_css_size() |
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141 * to query the width and height of a named HTML element. I'm |
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142 * calling this first to get the initial size of the canvas DOM |
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143 * element, and then call emscripten_set_canvas_size() to |
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144 * initialize the framebuffer size of the canvas to the same |
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145 * size as its DOM element. |
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146 * https://floooh.github.io/2017/02/22/emsc-html.html |
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147 **/ |
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148 unsigned int canvasWidth = 0; |
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149 unsigned int canvasHeight = 0; |
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150 |
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151 if (w > 0 || |
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152 h > 0) |
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153 { |
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154 canvasWidth = static_cast<unsigned int>(boost::math::iround(w)); |
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155 canvasHeight = static_cast<unsigned int>(boost::math::iround(h)); |
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156 } |
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157 |
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158 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth, canvasHeight); |
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159 compositor_.UpdateSize(canvasWidth, canvasHeight); |
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160 } |
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161 |
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162 void WebAssemblyCairoViewport::Refresh() |
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163 { |
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164 LOG(INFO) << "refreshing cairo viewport, TODO: blit to the canvans.getContext('2d')"; |
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165 GetCompositor().Refresh(); |
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166 } |
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167 |
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168 } |