////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2013 Jonathan De Wachter (dewachter.jonathan@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include 
#include 

#include 
#include 

#include 
#include 
#include 
#include 
#ifdef SFML_SYSTEM_ANDROID
#include 
#endif
#if defined(SFML_SYSTEM_LINUX) && !defined(SFML_USE_DRM)
#include 

#include 
#endif

// We check for this definition in order to avoid multiple definitions of GLAD
// entities during unity builds of SFML.
#ifndef SF_GLAD_EGL_IMPLEMENTATION_INCLUDED
#define SF_GLAD_EGL_IMPLEMENTATION_INCLUDED
#define SF_GLAD_EGL_IMPLEMENTATION
#include 
#endif

namespace
{
// A nested named namespace is used here to allow unity builds of SFML.
namespace EglContextImpl
{
EGLDisplay getInitializedDisplay()
{
#if defined(SFML_SYSTEM_ANDROID)

    // On Android, its native activity handles this for us
    sf::priv::ActivityStates& states = sf::priv::getActivity();
    const std::lock_guard     lock(states.mutex);

    return states.display;

#endif

    static EGLDisplay display = EGL_NO_DISPLAY;

    if (display == EGL_NO_DISPLAY)
    {
        display = eglCheck(eglGetDisplay(EGL_DEFAULT_DISPLAY));
        eglCheck(eglInitialize(display, nullptr, nullptr));
    }

    return display;
}


////////////////////////////////////////////////////////////
void ensureInit()
{
    static std::once_flag flag;

    std::call_once(flag,
                   []
                   {
                       if (!gladLoaderLoadEGL(EGL_NO_DISPLAY))
                       {
                           // At this point, the failure is unrecoverable
                           // Dump a message to the console and let the application terminate
                           sf::err()