Mercurial > hg > orthanc-stone
diff OrthancStone/Sources/Platforms/Sdl/SdlOpenGLContext.cpp @ 1899:917500c46fe0
moved the Platform folder from the Applications folder to the Stone library itself
author | Alain Mazy <am@osimis.io> |
---|---|
date | Sat, 29 Jan 2022 12:47:32 +0100 |
parents | |
children | 184b0aeae1af |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/OrthancStone/Sources/Platforms/Sdl/SdlOpenGLContext.cpp Sat Jan 29 12:47:32 2022 +0100 @@ -0,0 +1,131 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2022 Osimis S.A., Belgium + * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation, either version 3 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this program. If not, see + * <http://www.gnu.org/licenses/>. + **/ + +#include "SdlOpenGLContext.h" +#include "../../../OrthancStone/Sources/StoneException.h" + +#if ORTHANC_ENABLE_SDL == 1 + +#if !defined(ORTHANC_ENABLE_GLEW) +# error Macro ORTHANC_ENABLE_GLEW must be defined +#endif + +#if ORTHANC_ENABLE_GLEW == 1 +# include <GL/glew.h> +#endif + +#include <Logging.h> +#include <OrthancException.h> + +#include <boost/thread/mutex.hpp> + +namespace OrthancStone +{ + SdlOpenGLContext::SdlOpenGLContext(const char* title, + unsigned int width, + unsigned int height, + bool allowDpiScaling) + : window_(title, width, height, true /* enable OpenGL */, allowDpiScaling) + , context_(NULL) + { + context_ = SDL_GL_CreateContext(window_.GetObject()); + + if (context_ == NULL) + { + throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, + "Cannot initialize OpenGL"); + } + +#if ORTHANC_ENABLE_GLEW == 1 + // The initialization function of glew (i.e. "glewInit()") can + // only be called once an OpenGL is setup. + // https://stackoverflow.com/a/45033669/881731 + { + static boost::mutex mutex_; + static bool isGlewInitialized_ = false; + + boost::mutex::scoped_lock lock(mutex_); + + if (!isGlewInitialized_) + { + LOG(INFO) << "Initializing glew"; + + GLenum err = glewInit(); + if (GLEW_OK != err) + { + LOG(ERROR) << glewGetErrorString(err); + throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, + "Cannot initialize glew"); + } + + isGlewInitialized_ = true; + } + } +#endif + } + + + SdlOpenGLContext::~SdlOpenGLContext() + { + SDL_GL_DeleteContext(context_); + } + + void SdlOpenGLContext::MakeCurrent() + { + if (SDL_GL_MakeCurrent(window_.GetObject(), context_) != 0) + { + const char* errText = SDL_GetError(); + std::stringstream ss; + ss << "Cannot set current OpenGL context. SDL error text: " << errText; + std::string errStr = ss.str(); + throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, errStr.c_str()); + } + + // This makes our buffer swap synchronized with the monitor's vertical refresh + SDL_GL_SetSwapInterval(1); + } + + + void SdlOpenGLContext::SwapBuffer() + { + // Swap our buffer to display the current contents of buffer on screen + SDL_GL_SwapWindow(window_.GetObject()); + } + + + unsigned int SdlOpenGLContext::GetCanvasWidth() const + { + int w = 0; + SDL_GL_GetDrawableSize(window_.GetObject(), &w, NULL); + return static_cast<unsigned int>(w); + } + + + unsigned int SdlOpenGLContext::GetCanvasHeight() const + { + int h = 0; + SDL_GL_GetDrawableSize(window_.GetObject(), NULL, &h); + return static_cast<unsigned int>(h); + } +} + +#endif