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annotate Applications/Platforms/Sdl/SdlOpenGLContext.cpp @ 1739:9ac2a65d4172

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upgrade to year 2021
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 06 Jan 2021 17:50:00 +0100
parents 58abe9e13ee3
children 3889ae96d2e9
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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) 2017-2021 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 "SdlOpenGLContext.h"
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23 #include "../../../OrthancStone/Sources/StoneException.h"
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24
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25 #if ORTHANC_ENABLE_SDL == 1
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26
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27 #if !defined(ORTHANC_ENABLE_GLEW)
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28 # error Macro ORTHANC_ENABLE_GLEW must be defined
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29 #endif
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30
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31 #if ORTHANC_ENABLE_GLEW == 1
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32 # include <GL/glew.h>
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33 #endif
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34
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35 #include <Logging.h>
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36 #include <OrthancException.h>
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37
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38 #include <boost/thread/mutex.hpp>
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39
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40 namespace OrthancStone
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41 {
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42 SdlOpenGLContext::SdlOpenGLContext(const char* title,
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43 unsigned int width,
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44 unsigned int height,
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45 bool allowDpiScaling)
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46 : window_(title, width, height, true /* enable OpenGL */, allowDpiScaling)
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47 , context_(NULL)
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48 {
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49 context_ = SDL_GL_CreateContext(window_.GetObject());
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50
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51 if (context_ == NULL)
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52 {
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53 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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54 "Cannot initialize OpenGL");
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55 }
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56
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57 #if ORTHANC_ENABLE_GLEW == 1
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58 // The initialization function of glew (i.e. "glewInit()") can
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59 // only be called once an OpenGL is setup.
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60 // https://stackoverflow.com/a/45033669/881731
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61 {
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62 static boost::mutex mutex_;
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63 static bool isGlewInitialized_ = false;
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64
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65 boost::mutex::scoped_lock lock(mutex_);
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66
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67 if (!isGlewInitialized_)
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68 {
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69 LOG(INFO) << "Initializing glew";
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70
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71 GLenum err = glewInit();
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72 if (GLEW_OK != err)
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73 {
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74 LOG(ERROR) << glewGetErrorString(err);
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75 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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76 "Cannot initialize glew");
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77 }
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78
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79 isGlewInitialized_ = true;
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80 }
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81 }
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82 #endif
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83 }
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85
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86 SdlOpenGLContext::~SdlOpenGLContext()
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87 {
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88 SDL_GL_DeleteContext(context_);
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89 }
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90
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91 void SdlOpenGLContext::MakeCurrent()
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92 {
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93 if (SDL_GL_MakeCurrent(window_.GetObject(), context_) != 0)
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94 {
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95 const char* errText = SDL_GetError();
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96 std::stringstream ss;
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97 ss << "Cannot set current OpenGL context. SDL error text: " << errText;
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98 std::string errStr = ss.str();
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99 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, errStr.c_str());
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100 }
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101
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102 // This makes our buffer swap synchronized with the monitor's vertical refresh
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103 SDL_GL_SetSwapInterval(1);
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104 }
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106
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107 void SdlOpenGLContext::SwapBuffer()
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108 {
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109 // Swap our buffer to display the current contents of buffer on screen
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110 SDL_GL_SwapWindow(window_.GetObject());
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111 }
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113
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114 unsigned int SdlOpenGLContext::GetCanvasWidth() const
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115 {
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116 int w = 0;
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117 SDL_GL_GetDrawableSize(window_.GetObject(), &w, NULL);
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118 return static_cast<unsigned int>(w);
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119 }
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121
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122 unsigned int SdlOpenGLContext::GetCanvasHeight() const
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123 {
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124 int h = 0;
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125 SDL_GL_GetDrawableSize(window_.GetObject(), NULL, &h);
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126 return static_cast<unsigned int>(h);
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127 }
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128 }
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129
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130 #endif