Mercurial > hg > orthanc-stone
comparison OrthancStone/Sources/OpenGL/WebAssemblyOpenGLContext.cpp @ 1512:244ad1e4e76a
reorganization of folders
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 07 Jul 2020 16:21:02 +0200 |
parents | Framework/OpenGL/WebAssemblyOpenGLContext.cpp@6abd819aa534 |
children | 85e117739eca |
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1511:9dfeee74c1e6 | 1512:244ad1e4e76a |
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1 /** | |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * Copyright (C) 2017-2020 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 "WebAssemblyOpenGLContext.h" | |
23 | |
24 #include "../StoneException.h" | |
25 | |
26 #include <OrthancException.h> | |
27 | |
28 #include <emscripten/html5.h> | |
29 #include <emscripten/em_asm.h> | |
30 | |
31 #include <boost/math/special_functions/round.hpp> | |
32 | |
33 namespace OrthancStone | |
34 { | |
35 namespace OpenGL | |
36 { | |
37 class WebAssemblyOpenGLContext::PImpl | |
38 { | |
39 private: | |
40 std::string canvasSelector_; | |
41 EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_; | |
42 unsigned int canvasWidth_; | |
43 unsigned int canvasHeight_; | |
44 bool isContextLost_; | |
45 | |
46 public: | |
47 PImpl(const std::string& canvasSelector) | |
48 : canvasSelector_(canvasSelector) | |
49 , isContextLost_(false) | |
50 { | |
51 // Context configuration | |
52 EmscriptenWebGLContextAttributes attr; | |
53 emscripten_webgl_init_context_attributes(&attr); | |
54 | |
55 context_ = emscripten_webgl_create_context(canvasSelector.c_str(), &attr); | |
56 if (context_ == 0) | |
57 { | |
58 std::string message("Cannot create an OpenGL context for the element with the following CSS selector: \""); | |
59 message += canvasSelector; | |
60 message += "\" Please make sure the -s DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=1 flag has been passed to Emscripten when building."; | |
61 LOG(ERROR) << message; | |
62 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, message); | |
63 } | |
64 | |
65 UpdateSize(); | |
66 } | |
67 | |
68 void* DebugGetInternalContext() const | |
69 { | |
70 return reinterpret_cast<void*>(context_); | |
71 } | |
72 | |
73 bool IsContextLost() | |
74 { | |
75 //LOG(TRACE) << "IsContextLost() for context " << std::hex << context_ << std::dec; | |
76 bool apiFlag = (emscripten_is_webgl_context_lost(context_) != 0); | |
77 isContextLost_ = apiFlag; | |
78 return isContextLost_; | |
79 } | |
80 | |
81 void SetLostContext() | |
82 { | |
83 isContextLost_ = true; | |
84 } | |
85 | |
86 ~PImpl() | |
87 { | |
88 try | |
89 { | |
90 EMSCRIPTEN_RESULT result = emscripten_webgl_destroy_context(context_); | |
91 if (result != EMSCRIPTEN_RESULT_SUCCESS) | |
92 { | |
93 LOG(ERROR) << "emscripten_webgl_destroy_context returned code " << result; | |
94 } | |
95 } | |
96 catch (const Orthanc::OrthancException& e) | |
97 { | |
98 if (e.HasDetails()) | |
99 { | |
100 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What() << " Details: " << e.GetDetails(); | |
101 } | |
102 else | |
103 { | |
104 LOG(ERROR) << "OrthancException in WebAssemblyOpenGLContext::~PImpl: " << e.What(); | |
105 } | |
106 } | |
107 catch (const std::exception& e) | |
108 { | |
109 LOG(ERROR) << "std::exception in WebAssemblyOpenGLContext::~PImpl: " << e.what(); | |
110 } | |
111 catch (...) | |
112 { | |
113 LOG(ERROR) << "Unknown exception in WebAssemblyOpenGLContext::~PImpl"; | |
114 } | |
115 } | |
116 | |
117 const std::string& GetCanvasSelector() const | |
118 { | |
119 return canvasSelector_; | |
120 } | |
121 | |
122 void MakeCurrent() | |
123 { | |
124 if (IsContextLost()) | |
125 { | |
126 LOG(ERROR) << "MakeCurrent() called on lost context " << context_; | |
127 throw StoneException(ErrorCode_WebGLContextLost); | |
128 } | |
129 | |
130 if (emscripten_is_webgl_context_lost(context_)) | |
131 { | |
132 LOG(ERROR) << "OpenGL context has been lost for canvas selector: " << canvasSelector_; | |
133 SetLostContext(); | |
134 throw StoneException(ErrorCode_WebGLContextLost); | |
135 } | |
136 | |
137 if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS) | |
138 { | |
139 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, | |
140 "Cannot set the OpenGL context"); | |
141 } | |
142 } | |
143 | |
144 void SwapBuffer() | |
145 { | |
146 /** | |
147 * "Rendered WebGL content is implicitly presented (displayed to | |
148 * the user) on the canvas when the event handler that renders with | |
149 * WebGL returns back to the browser event loop." | |
150 * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context | |
151 * | |
152 * Could call "emscripten_webgl_commit_frame()" if | |
153 * "explicitSwapControl" option were set to "true". | |
154 **/ | |
155 } | |
156 | |
157 unsigned int GetCanvasWidth() const | |
158 { | |
159 return canvasWidth_; | |
160 } | |
161 | |
162 unsigned int GetCanvasHeight() const | |
163 { | |
164 return canvasHeight_; | |
165 } | |
166 | |
167 void UpdateSize() | |
168 { | |
169 double w, h; | |
170 emscripten_get_element_css_size(canvasSelector_.c_str(), &w, &h); | |
171 | |
172 /** | |
173 * Emscripten has the function emscripten_get_element_css_size() | |
174 * to query the width and height of a named HTML element. I'm | |
175 * calling this first to get the initial size of the canvas DOM | |
176 * element, and then call emscripten_set_canvas_size() to | |
177 * initialize the framebuffer size of the canvas to the same | |
178 * size as its DOM element. | |
179 * https://floooh.github.io/2017/02/22/emsc-html.html | |
180 **/ | |
181 | |
182 if (w <= 0 || | |
183 h <= 0) | |
184 { | |
185 canvasWidth_ = 0; | |
186 canvasHeight_ = 0; | |
187 } | |
188 else | |
189 { | |
190 canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w)); | |
191 canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h)); | |
192 } | |
193 | |
194 emscripten_set_canvas_element_size(canvasSelector_.c_str(), canvasWidth_, canvasHeight_); | |
195 } | |
196 }; | |
197 | |
198 | |
199 WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvasSelector) : | |
200 pimpl_(new PImpl(canvasSelector)) | |
201 { | |
202 } | |
203 | |
204 bool WebAssemblyOpenGLContext::IsContextLost() | |
205 { | |
206 return pimpl_->IsContextLost(); | |
207 } | |
208 | |
209 void WebAssemblyOpenGLContext::SetLostContext() | |
210 { | |
211 pimpl_->SetLostContext(); | |
212 } | |
213 | |
214 void* WebAssemblyOpenGLContext::DebugGetInternalContext() const | |
215 { | |
216 return pimpl_->DebugGetInternalContext(); | |
217 } | |
218 | |
219 void WebAssemblyOpenGLContext::MakeCurrent() | |
220 { | |
221 assert(pimpl_.get() != NULL); | |
222 pimpl_->MakeCurrent(); | |
223 } | |
224 | |
225 void WebAssemblyOpenGLContext::SwapBuffer() | |
226 { | |
227 assert(pimpl_.get() != NULL); | |
228 pimpl_->SwapBuffer(); | |
229 } | |
230 | |
231 unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const | |
232 { | |
233 assert(pimpl_.get() != NULL); | |
234 return pimpl_->GetCanvasWidth(); | |
235 } | |
236 | |
237 unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const | |
238 { | |
239 assert(pimpl_.get() != NULL); | |
240 return pimpl_->GetCanvasHeight(); | |
241 } | |
242 | |
243 void WebAssemblyOpenGLContext::RefreshCanvasSize() | |
244 { | |
245 assert(pimpl_.get() != NULL); | |
246 | |
247 try | |
248 { | |
249 pimpl_->UpdateSize(); | |
250 } | |
251 catch (const StoneException& e) | |
252 { | |
253 // Ignore problems about the loss of the WebGL context (edge case) | |
254 if (e.GetErrorCode() == ErrorCode_WebGLContextLost) | |
255 { | |
256 return; | |
257 } | |
258 else | |
259 { | |
260 throw; | |
261 } | |
262 } | |
263 } | |
264 | |
265 const std::string& WebAssemblyOpenGLContext::GetCanvasSelector() const | |
266 { | |
267 assert(pimpl_.get() != NULL); | |
268 return pimpl_->GetCanvasSelector(); | |
269 } | |
270 } | |
271 } |