Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Platforms/Sdl/SdlOpenGLContext.cpp @ 2107:5970030a413c
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 24 Nov 2023 11:29:46 +0100 |
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rev | line source |
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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) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
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7 * |
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8 * This program is free software: you can redistribute it and/or |
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9 * modify it under the terms of the GNU Lesser General Public License |
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10 * as published by the Free Software Foundation, either version 3 of |
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11 * the License, or (at your option) any later version. |
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12 * |
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13 * This program is distributed in the hope that it will be useful, but |
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 * Lesser General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU Lesser General Public |
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19 * License along with this program. If not, see |
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20 * <http://www.gnu.org/licenses/>. |
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21 **/ |
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22 |
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23 #include "SdlOpenGLContext.h" |
1901 | 24 #include "../../StoneException.h" |
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25 |
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26 #if ORTHANC_ENABLE_SDL == 1 |
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27 |
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28 #if !defined(ORTHANC_ENABLE_GLEW) |
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29 # error Macro ORTHANC_ENABLE_GLEW must be defined |
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30 #endif |
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31 |
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32 #if ORTHANC_ENABLE_GLEW == 1 |
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33 # include <GL/glew.h> |
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34 #endif |
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35 |
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36 #include <Logging.h> |
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37 #include <OrthancException.h> |
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38 |
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39 #include <boost/thread/mutex.hpp> |
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40 |
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41 namespace OrthancStone |
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42 { |
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43 SdlOpenGLContext::SdlOpenGLContext(const char* title, |
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44 unsigned int width, |
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45 unsigned int height, |
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46 bool allowDpiScaling) |
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47 : window_(title, width, height, true /* enable OpenGL */, allowDpiScaling) |
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48 , context_(NULL) |
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49 { |
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50 context_ = SDL_GL_CreateContext(window_.GetObject()); |
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51 |
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52 if (context_ == NULL) |
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53 { |
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54 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, |
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55 "Cannot initialize OpenGL"); |
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56 } |
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57 |
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58 #if ORTHANC_ENABLE_GLEW == 1 |
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59 // The initialization function of glew (i.e. "glewInit()") can |
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60 // only be called once an OpenGL is setup. |
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61 // https://stackoverflow.com/a/45033669/881731 |
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62 { |
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63 static boost::mutex mutex_; |
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64 static bool isGlewInitialized_ = false; |
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65 |
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66 boost::mutex::scoped_lock lock(mutex_); |
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67 |
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68 if (!isGlewInitialized_) |
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69 { |
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70 LOG(INFO) << "Initializing glew"; |
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71 |
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72 GLenum err = glewInit(); |
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73 if (GLEW_OK != err) |
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74 { |
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75 LOG(ERROR) << glewGetErrorString(err); |
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76 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, |
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77 "Cannot initialize glew"); |
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78 } |
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79 |
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80 isGlewInitialized_ = true; |
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81 } |
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82 } |
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83 #endif |
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84 } |
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85 |
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86 |
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87 SdlOpenGLContext::~SdlOpenGLContext() |
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88 { |
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89 SDL_GL_DeleteContext(context_); |
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90 } |
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91 |
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92 void SdlOpenGLContext::MakeCurrent() |
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93 { |
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94 if (SDL_GL_MakeCurrent(window_.GetObject(), context_) != 0) |
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95 { |
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96 const char* errText = SDL_GetError(); |
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97 std::stringstream ss; |
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98 ss << "Cannot set current OpenGL context. SDL error text: " << errText; |
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99 std::string errStr = ss.str(); |
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100 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, errStr.c_str()); |
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101 } |
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102 |
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103 // This makes our buffer swap synchronized with the monitor's vertical refresh |
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104 SDL_GL_SetSwapInterval(1); |
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105 } |
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106 |
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107 |
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108 void SdlOpenGLContext::SwapBuffer() |
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109 { |
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110 // Swap our buffer to display the current contents of buffer on screen |
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111 SDL_GL_SwapWindow(window_.GetObject()); |
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112 } |
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113 |
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114 |
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115 unsigned int SdlOpenGLContext::GetCanvasWidth() const |
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116 { |
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117 int w = 0; |
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118 SDL_GL_GetDrawableSize(window_.GetObject(), &w, NULL); |
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119 return static_cast<unsigned int>(w); |
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120 } |
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121 |
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122 |
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123 unsigned int SdlOpenGLContext::GetCanvasHeight() const |
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124 { |
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125 int h = 0; |
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126 SDL_GL_GetDrawableSize(window_.GetObject(), NULL, &h); |
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127 return static_cast<unsigned int>(h); |
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128 } |
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129 } |
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130 |
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131 #endif |