Mercurial > hg > orthanc-stone
diff Applications/Sdl/SdlOpenGLContext.cpp @ 891:0aff28f15ea2
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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Applications/Sdl/SdlOpenGLContext.cpp Wed Jul 10 18:18:42 2019 +0200 @@ -0,0 +1,122 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2019 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Affero 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 + * Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#include "SdlOpenGLContext.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 <Core/OrthancException.h> + +namespace OrthancStone +{ + SdlOpenGLContext::SdlOpenGLContext(const char* title, + unsigned int width, + unsigned int height, + bool allowDpiScaling) : + window_(title, width, height, true /* enable OpenGL */, allowDpiScaling) + { + 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) + { + 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) + { + throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, + "Cannot set current OpenGL context"); + } + + // This makes our buffer swap syncronized 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