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annotate Framework/Viewport/WebAssemblyViewport.cpp @ 942:685c9a2d115f

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Added missing ORTHANC_OVERRIDE + preparation for lost GL context handling + stubs for GL context event handlers
author Benjamin Golinvaux <bgo@osimis.io>
date Mon, 05 Aug 2019 12:27:27 +0200
parents a6c12fe88bcb
children 1091b2adeb5a
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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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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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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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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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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 }