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comparison 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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1229:b9f2a111c5b9 1232:a28861abf888
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU Affero General Public License
9 * as published by the Free Software Foundation, either version 3 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Affero General Public License for more details.
16 *
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 **/
20
21
22 #include "WebGLViewport.h"
23
24 #include "../StoneException.h"
25 #include "../Scene2D/OpenGLCompositor.h"
26
27 namespace OrthancStone
28 {
29 void WebGLViewport::Paint(ICompositor& compositor,
30 ViewportController& controller)
31 {
32 try
33 {
34 compositor.Refresh(controller.GetScene());
35
36 /**
37 * No need to manually swap the buffer: "Rendered WebGL content
38 * is implicitly presented (displayed to the user) on the canvas
39 * when the event handler that renders with WebGL returns back
40 * to the browser event loop."
41 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context
42 *
43 * Could call "emscripten_webgl_commit_frame()" if
44 * "explicitSwapControl" option were set to "true".
45 **/
46 }
47 catch (const StoneException& e)
48 {
49 // Ignore problems about the loss of the WebGL context (edge case)
50 if (e.GetErrorCode() == ErrorCode_WebGLContextLost)
51 {
52 return;
53 }
54 else
55 {
56 throw;
57 }
58 }
59 }
60
61
62 void WebGLViewport::UpdateSize(ICompositor& compositor)
63 {
64 try
65 {
66 context_.UpdateSize();
67 }
68 catch (const StoneException& e)
69 {
70 // Ignore problems about the loss of the WebGL context (edge case)
71 if (e.GetErrorCode() == ErrorCode_WebGLContextLost)
72 {
73 return;
74 }
75 else
76 {
77 throw;
78 }
79 }
80 }
81
82
83 WebGLViewport::WebGLViewport(const std::string& canvasId) :
84 WebAssemblyViewport(canvasId, NULL),
85 context_(GetFullCanvasId())
86 {
87 AcquireCompositor(new OpenGLCompositor(context_));
88 }
89
90
91 WebGLViewport::WebGLViewport(const std::string& canvasId,
92 const Scene2D& scene) :
93 WebAssemblyViewport(canvasId, &scene),
94 context_(GetFullCanvasId())
95 {
96 AcquireCompositor(new OpenGLCompositor(context_));
97 }
98
99
100 WebGLViewport::~WebGLViewport()
101 {
102 // Make sure to delete the compositor before its parent "context_" gets deleted
103 ClearCompositor();
104 }
105 }