Mercurial > hg > orthanc-stone
comparison Applications/Sdl/SdlOpenGLContext.cpp @ 891:0aff28f15ea2
new abstraction: IViewport
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 10 Jul 2019 18:18:42 +0200 |
parents | Applications/Sdl/SdlOpenGLWindow.cpp@002d9562c8f5 |
children | 1091b2adeb5a |
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890:77c96ba899f9 | 891:0aff28f15ea2 |
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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) 2017-2019 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 "SdlOpenGLContext.h" | |
23 | |
24 #if ORTHANC_ENABLE_SDL == 1 | |
25 | |
26 #if !defined(ORTHANC_ENABLE_GLEW) | |
27 # error Macro ORTHANC_ENABLE_GLEW must be defined | |
28 #endif | |
29 | |
30 #if ORTHANC_ENABLE_GLEW == 1 | |
31 # include <GL/glew.h> | |
32 #endif | |
33 | |
34 #include <Core/OrthancException.h> | |
35 | |
36 namespace OrthancStone | |
37 { | |
38 SdlOpenGLContext::SdlOpenGLContext(const char* title, | |
39 unsigned int width, | |
40 unsigned int height, | |
41 bool allowDpiScaling) : | |
42 window_(title, width, height, true /* enable OpenGL */, allowDpiScaling) | |
43 { | |
44 context_ = SDL_GL_CreateContext(window_.GetObject()); | |
45 | |
46 if (context_ == NULL) | |
47 { | |
48 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, | |
49 "Cannot initialize OpenGL"); | |
50 } | |
51 | |
52 #if ORTHANC_ENABLE_GLEW == 1 | |
53 // The initialization function of glew (i.e. "glewInit()") can | |
54 // only be called once an OpenGL is setup. | |
55 // https://stackoverflow.com/a/45033669/881731 | |
56 { | |
57 static boost::mutex mutex_; | |
58 static bool isGlewInitialized_ = false; | |
59 | |
60 boost::mutex::scoped_lock lock(mutex_); | |
61 | |
62 if (!isGlewInitialized_) | |
63 { | |
64 LOG(INFO) << "Initializing glew"; | |
65 | |
66 GLenum err = glewInit(); | |
67 if (GLEW_OK != err) | |
68 { | |
69 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, | |
70 "Cannot initialize glew"); | |
71 } | |
72 | |
73 isGlewInitialized_ = true; | |
74 } | |
75 } | |
76 #endif | |
77 } | |
78 | |
79 | |
80 SdlOpenGLContext::~SdlOpenGLContext() | |
81 { | |
82 SDL_GL_DeleteContext(context_); | |
83 } | |
84 | |
85 | |
86 void SdlOpenGLContext::MakeCurrent() | |
87 { | |
88 if (SDL_GL_MakeCurrent(window_.GetObject(), context_) != 0) | |
89 { | |
90 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, | |
91 "Cannot set current OpenGL context"); | |
92 } | |
93 | |
94 // This makes our buffer swap syncronized with the monitor's vertical refresh | |
95 SDL_GL_SetSwapInterval(1); | |
96 } | |
97 | |
98 | |
99 void SdlOpenGLContext::SwapBuffer() | |
100 { | |
101 // Swap our buffer to display the current contents of buffer on screen | |
102 SDL_GL_SwapWindow(window_.GetObject()); | |
103 } | |
104 | |
105 | |
106 unsigned int SdlOpenGLContext::GetCanvasWidth() const | |
107 { | |
108 int w = 0; | |
109 SDL_GL_GetDrawableSize(window_.GetObject(), &w, NULL); | |
110 return static_cast<unsigned int>(w); | |
111 } | |
112 | |
113 | |
114 unsigned int SdlOpenGLContext::GetCanvasHeight() const | |
115 { | |
116 int h = 0; | |
117 SDL_GL_GetDrawableSize(window_.GetObject(), NULL, &h); | |
118 return static_cast<unsigned int>(h); | |
119 } | |
120 } | |
121 | |
122 #endif |