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annotate Applications/Sdl/SdlOpenGLContext.cpp @ 891:0aff28f15ea2

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