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annotate Applications/Platforms/WebAssembly/WebGLViewport.cpp @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
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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) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Affero General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Affero General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Affero General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "WebGLViewport.h"
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24
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25 #include "../../../OrthancStone/Sources/StoneException.h"
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26 #include "../../../OrthancStone/Sources/Scene2D/OpenGLCompositor.h"
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27 #include "../../../OrthancStone/Sources/Scene2DViewport/ViewportController.h"
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29 namespace OrthancStone
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30 {
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31 void WebGLViewport::Paint(ICompositor& compositor,
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32 ViewportController& controller)
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33 {
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34 try
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35 {
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36 compositor.Refresh(controller.GetScene());
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37
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38 /**
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39 * No need to manually swap the buffer: "Rendered WebGL content
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40 * is implicitly presented (displayed to the user) on the canvas
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41 * when the event handler that renders with WebGL returns back
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42 * to the browser event loop."
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43 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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44 *
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45 * Could call "emscripten_webgl_commit_frame()" if
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46 * "explicitSwapControl" option were set to "true".
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47 **/
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48 }
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49 catch (const StoneException& e)
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50 {
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51 // Ignore problems about the loss of the WebGL context (edge case)
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52 if (e.GetErrorCode() == ErrorCode_WebGLContextLost)
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53 {
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54 return;
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55 }
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56 else
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57 {
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58 throw;
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59 }
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60 }
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61 }
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62
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63
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64 WebGLViewport::WebGLViewport(const std::string& canvasId, bool enableEmscriptenMouseEvents) :
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65 WebAssemblyViewport(canvasId,enableEmscriptenMouseEvents),
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66 context_(GetCanvasCssSelector())
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67 {
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68 AcquireCompositor(new OpenGLCompositor(context_));
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69 }
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71 boost::shared_ptr<WebGLViewport> WebGLViewport::Create(
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72 const std::string& canvasId, bool enableEmscriptenMouseEvents)
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73 {
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74 boost::shared_ptr<WebGLViewport> that = boost::shared_ptr<WebGLViewport>(
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75 new WebGLViewport(canvasId, enableEmscriptenMouseEvents));
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76
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77 that->WebAssemblyViewport::PostConstructor();
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78 return that;
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79 }
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80
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81 WebGLViewport::~WebGLViewport()
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82 {
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83 // Make sure to delete the compositor before its parent "context_" gets
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84 // deleted
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85 ClearCompositor();
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86 }
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87 }