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annotate Applications/Sdl/SdlOpenGLWindow.cpp @ 613:412a2d01a189

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automatic initialization of glew
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 30 Apr 2019 16:44:23 +0200
parents 6e471e6cf09b
children 4ec32d4d0867
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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 "SdlOpenGLWindow.h"
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23
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24 #if ORTHANC_ENABLE_SDL == 1
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25
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26 #if !defined(ORTHANC_ENABLE_GLEW)
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27 # error Macro ORTHANC_ENABLE_GLEW must be defined
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28 #endif
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29
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30 #if ORTHANC_ENABLE_GLEW == 1
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31 # include <GL/glew.h>
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32 #endif
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33
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34 #include <Core/OrthancException.h>
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35
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36 namespace OrthancStone
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37 {
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38 static boost::mutex globalMutex_;
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39 static bool globalIsGlewInitialized_ = false;
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40
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41 SdlOpenGLWindow::SdlOpenGLWindow(const char* title,
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42 unsigned int width,
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43 unsigned int height) :
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44 window_(title, width, height, true /* enable OpenGL */)
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45 {
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46 context_ = SDL_GL_CreateContext(window_.GetObject());
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47
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48 if (context_ == NULL)
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49 {
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50 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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51 "Cannot initialize OpenGL");
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52 }
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53
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54 #if ORTHANC_ENABLE_GLEW == 1
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55 // The initialization function of glew (i.e. "glewInit()") can
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56 // only be called once an OpenGL is setup.
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57 // https://stackoverflow.com/a/45033669/881731
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58 {
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59 boost::mutex::scoped_lock lock(globalMutex_);
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60
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61 if (!globalIsGlewInitialized_)
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62 {
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63 LOG(INFO) << "Initializing glew";
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64
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65 GLenum err = glewInit();
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66 if (GLEW_OK != err)
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67 {
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68 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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69 "Cannot initialize glew");
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70 }
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71
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72 globalIsGlewInitialized_ = true;
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73 }
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74 }
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75 #endif
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76 }
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77
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78
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79 SdlOpenGLWindow::~SdlOpenGLWindow()
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80 {
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81 SDL_GL_DeleteContext(context_);
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82 }
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83
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84
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85 void SdlOpenGLWindow::MakeCurrent()
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86 {
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87 if (SDL_GL_MakeCurrent(window_.GetObject(), context_) != 0)
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88 {
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89 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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90 "Cannot set current OpenGL context");
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91 }
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92
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93 // This makes our buffer swap syncronized with the monitor's vertical refresh
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94 SDL_GL_SetSwapInterval(1);
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95 }
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96
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97
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98 void SdlOpenGLWindow::SwapBuffer()
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99 {
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100 // Swap our buffer to display the current contents of buffer on screen
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101 SDL_GL_SwapWindow(window_.GetObject());
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102 }
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103
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104
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105 unsigned int SdlOpenGLWindow::GetCanvasWidth()
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106 {
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107 int w = 0;
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108 SDL_GL_GetDrawableSize(window_.GetObject(), &w, NULL);
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109 return static_cast<unsigned int>(w);
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110 }
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111
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112
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113 unsigned int SdlOpenGLWindow::GetCanvasHeight()
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114 {
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115 int h = 0;
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116 SDL_GL_GetDrawableSize(window_.GetObject(), NULL, &h);
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117 return static_cast<unsigned int>(h);
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118 }
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119 }
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120
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121 #endif