Mercurial > hg > orthanc-stone

comparison OrthancStone/Sources/Platforms/WebAssembly/WebGLViewport.cpp @ 1899:917500c46fe0

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moved the Platform folder from the Applications folder to the Stone library itself
author Alain Mazy <am@osimis.io>
date Sat, 29 Jan 2022 12:47:32 +0100
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children 184b0aeae1af
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1898:a5e54bd87b25 1899:917500c46fe0
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
7 *
8 * This program is free software: you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation, either version 3 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this program. If not, see
20 * <http://www.gnu.org/licenses/>.
21 **/
22
23
24 #include "WebGLViewport.h"
25
26 #include "../../../OrthancStone/Sources/StoneException.h"
27 #include "../../../OrthancStone/Sources/Scene2D/OpenGLCompositor.h"
28 #include "../../../OrthancStone/Sources/Scene2DViewport/ViewportController.h"
29
30 namespace OrthancStone
31 {
32 void WebGLViewport::Paint(ICompositor& compositor,
33 ViewportController& controller)
34 {
35 try
36 {
37 compositor.Refresh(controller.GetScene());
38
39 /**
40 * No need to manually swap the buffer: "Rendered WebGL content
41 * is implicitly presented (displayed to the user) on the canvas
42 * when the event handler that renders with WebGL returns back
43 * to the browser event loop."
44 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
45 *
46 * Could call "emscripten_webgl_commit_frame()" if
47 * "explicitSwapControl" option were set to "true".
48 **/
49 }
50 catch (const StoneException& e)
51 {
52 // Ignore problems about the loss of the WebGL context (edge case)
53 if (e.GetErrorCode() == ErrorCode_WebGLContextLost)
54 {
55 return;
56 }
57 else
58 {
59 throw;
60 }
61 }
62 }
63
64
65 WebGLViewport::WebGLViewport(const std::string& canvasId, bool enableEmscriptenMouseEvents) :
66 WebAssemblyViewport(canvasId,enableEmscriptenMouseEvents),
67 context_(GetCanvasCssSelector())
68 {
69 AcquireCompositor(new OpenGLCompositor(context_));
70 }
71
72 boost::shared_ptr<WebGLViewport> WebGLViewport::Create(
73 const std::string& canvasId, bool enableEmscriptenMouseEvents)
74 {
75 boost::shared_ptr<WebGLViewport> that = boost::shared_ptr<WebGLViewport>(
76 new WebGLViewport(canvasId, enableEmscriptenMouseEvents));
77
78 that->WebAssemblyViewport::PostConstructor();
79 return that;
80 }
81
82 WebGLViewport::~WebGLViewport()
83 {
84 // Make sure to delete the compositor before its parent "context_" gets
85 // deleted
86 ClearCompositor();
87 }
88 }