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105 lines
3.4 KiB
105 lines
3.4 KiB
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2016 CERN
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* Copyright (C) 2020-2021 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* @author Maciej Suminski <maciej.suminski@cern.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef GL_CONTEXT_MANAGER_H
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#define GL_CONTEXT_MANAGER_H
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#include <wx/glcanvas.h>
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#include <mutex>
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#include <map>
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class GL_CONTEXT_MANAGER
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{
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public:
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/**
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* Return the GL_CONTEXT_MANAGER instance (singleton).
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*/
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static GL_CONTEXT_MANAGER& Get();
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/**
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* Create a managed OpenGL context.
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*
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* It is assured that the created context is freed upon exit. See wxGLContext
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* documentation for the parameters description.
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*
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* @return Created OpenGL context.
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*/
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wxGLContext* CreateCtx( wxGLCanvas* aCanvas, const wxGLContext* aOther = nullptr );
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/**
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* Destroy a managed OpenGL context.
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*
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* The context to be removed has to be created using GL_CONTEXT_MANAGER::CreateCtx() first.
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*
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* @param aContext is the OpenGL context to be destroyed. It will not be managed anymore.
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*/
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void DestroyCtx( wxGLContext* aContext );
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/**
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* Destroy all managed OpenGL contexts.
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*
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* This method should be called in the final deinitialization routine.
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*/
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void DeleteAll();
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/**
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* Set a context as current and prevents other canvases from switching it.
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*
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* Requires calling UnlockCtx() when there are no more GL calls for the context. If
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* another canvas has already locked a GL context, then the calling process is blocked.
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*
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* @param aContext is the GL context to be bound.
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* @param aCanvas (optional) allows caller to bind the context to a non-parent canvas
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* (e.g. when a few canvases share a single GL context).
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*/
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void LockCtx( wxGLContext* aContext, wxGLCanvas* aCanvas );
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/**
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* Allow other canvases to bind an OpenGL context.
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*
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* @param aContext is the currently bound context. It is only a check to assure the right
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* canvas wants to unlock GL context.
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*/
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void UnlockCtx( wxGLContext* aContext );
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private:
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///< Map of GL contexts & their parent canvases.
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std::map<wxGLContext*, wxGLCanvas*> m_glContexts;
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///< Currently bound GL context.
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wxGLContext* m_glCtx;
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///< Lock to prevent unexpected GL context switching.
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std::mutex m_glCtxMutex;
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// Singleton
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GL_CONTEXT_MANAGER();
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GL_CONTEXT_MANAGER( const GL_CONTEXT_MANAGER& );
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void operator=( const GL_CONTEXT_MANAGER& );
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};
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#endif /* GL_CONTEXT_MANAGER_H */
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