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annotate Framework/Viewport/WebGLViewport.cpp @ 1232:a28861abf888 broker

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viewports for WebAssembly
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 09 Dec 2019 17:46:33 +0100
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children 0ca50d275b9a
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a28861abf888 viewports for WebAssembly
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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 "WebGLViewport.h"
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23
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24 #include "../StoneException.h"
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25 #include "../Scene2D/OpenGLCompositor.h"
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26
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27 namespace OrthancStone
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28 {
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29 void WebGLViewport::Paint(ICompositor& compositor,
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30 ViewportController& controller)
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31 {
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32 try
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33 {
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34 compositor.Refresh(controller.GetScene());
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35
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36 /**
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37 * No need to manually swap the buffer: "Rendered WebGL content
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38 * is implicitly presented (displayed to the user) on the canvas
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39 * when the event handler that renders with WebGL returns back
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40 * to the browser event loop."
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41 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
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42 *
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43 * Could call "emscripten_webgl_commit_frame()" if
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44 * "explicitSwapControl" option were set to "true".
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45 **/
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46 }
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47 catch (const StoneException& e)
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48 {
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49 // Ignore problems about the loss of the WebGL context (edge case)
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50 if (e.GetErrorCode() == ErrorCode_WebGLContextLost)
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51 {
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52 return;
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53 }
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54 else
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55 {
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56 throw;
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57 }
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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 void WebGLViewport::UpdateSize(ICompositor& compositor)
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63 {
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64 try
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65 {
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66 context_.UpdateSize();
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67 }
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68 catch (const StoneException& e)
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69 {
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70 // Ignore problems about the loss of the WebGL context (edge case)
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71 if (e.GetErrorCode() == ErrorCode_WebGLContextLost)
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72 {
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73 return;
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74 }
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75 else
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76 {
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77 throw;
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78 }
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79 }
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80 }
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81
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82
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83 WebGLViewport::WebGLViewport(const std::string& canvasId) :
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84 WebAssemblyViewport(canvasId, NULL),
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85 context_(GetFullCanvasId())
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86 {
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87 AcquireCompositor(new OpenGLCompositor(context_));
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88 }
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89
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90
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91 WebGLViewport::WebGLViewport(const std::string& canvasId,
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92 const Scene2D& scene) :
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93 WebAssemblyViewport(canvasId, &scene),
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94 context_(GetFullCanvasId())
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95 {
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96 AcquireCompositor(new OpenGLCompositor(context_));
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97 }
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98
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99
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100 WebGLViewport::~WebGLViewport()
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101 {
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102 // Make sure to delete the compositor before its parent "context_" gets deleted
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103 ClearCompositor();
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104 }
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105 }