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annotate Applications/Platforms/WebAssembly/WebGLViewport.cpp @ 1591:5887a4f8594b

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moving platform-specific files out of the "OrthancStone" folder
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 23 Oct 2020 13:15:03 +0200
parents OrthancStone/Sources/Viewport/WebGLViewport.cpp@314b6dc507d9
children 9ac2a65d4172
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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) 2017-2020 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 "WebGLViewport.h"
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23
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24 #include "../../../OrthancStone/Sources/StoneException.h"
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25 #include "../../../OrthancStone/Sources/Scene2D/OpenGLCompositor.h"
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26 #include "../../../OrthancStone/Sources/Scene2DViewport/ViewportController.h"
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27
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28 namespace OrthancStone
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29 {
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30 void WebGLViewport::Paint(ICompositor& compositor,
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31 ViewportController& controller)
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32 {
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33 try
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34 {
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35 compositor.Refresh(controller.GetScene());
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36
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37 /**
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38 * No need to manually swap the buffer: "Rendered WebGL content
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39 * is implicitly presented (displayed to the user) on the canvas
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40 * when the event handler that renders with WebGL returns back
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41 * to the browser event loop."
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42 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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43 *
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44 * Could call "emscripten_webgl_commit_frame()" if
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45 * "explicitSwapControl" option were set to "true".
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46 **/
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47 }
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48 catch (const StoneException& e)
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49 {
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50 // Ignore problems about the loss of the WebGL context (edge case)
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51 if (e.GetErrorCode() == ErrorCode_WebGLContextLost)
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52 {
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53 return;
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54 }
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55 else
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56 {
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57 throw;
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58 }
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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 WebGLViewport::WebGLViewport(const std::string& canvasId, bool enableEmscriptenMouseEvents) :
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64 WebAssemblyViewport(canvasId,enableEmscriptenMouseEvents),
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65 context_(GetCanvasCssSelector())
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66 {
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67 AcquireCompositor(new OpenGLCompositor(context_));
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68 }
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69
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70 boost::shared_ptr<WebGLViewport> WebGLViewport::Create(
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71 const std::string& canvasId, bool enableEmscriptenMouseEvents)
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72 {
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73 boost::shared_ptr<WebGLViewport> that = boost::shared_ptr<WebGLViewport>(
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74 new WebGLViewport(canvasId, enableEmscriptenMouseEvents));
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75
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76 that->WebAssemblyViewport::PostConstructor();
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77 return that;
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78 }
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79
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80 WebGLViewport::~WebGLViewport()
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81 {
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82 // Make sure to delete the compositor before its parent "context_" gets
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83 // deleted
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84 ClearCompositor();
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85 }
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86 }