//
// Copyright 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// global_state.h : Defines functions for querying the thread-local GL and EGL state.

#ifndef LIBGLESV2_GLOBALSTATE_H_
#define LIBGLESV2_GLOBALSTATE_H_

#include "common/tls.h"
#include "libANGLE/Context.h"
#include "libANGLE/Debug.h"
#include "libANGLE/Thread.h"
#include "libANGLE/features.h"

#include <mutex>

namespace angle
{
using GlobalMutex = std::recursive_mutex;
}  // namespace angle

namespace egl
{
class Debug;
class Thread;

angle::GlobalMutex &GetGlobalMutex();
Thread *GetCurrentThread();
Debug *GetDebug();
void SetContextCurrent(Thread *thread, gl::Context *context);
}  // namespace egl

#define ANGLE_SCOPED_GLOBAL_LOCK() \
    std::lock_guard<angle::GlobalMutex> globalMutexLock(egl::GetGlobalMutex())

namespace gl
{
extern Context *gSingleThreadedContext;

ANGLE_INLINE Context *GetGlobalContext()
{
#if defined(ANGLE_PLATFORM_ANDROID)
    // TODO: Replace this branch with a compile time flag (http://anglebug.com/4764)
    if (gUseAndroidOpenGLTlsSlot)
    {
        return static_cast<gl::Context *>(ANGLE_ANDROID_GET_GL_TLS()[kAndroidOpenGLTlsSlot]);
    }
#endif

    if (gSingleThreadedContext)
    {
        return gSingleThreadedContext;
    }

    egl::Thread *thread = egl::GetCurrentThread();
    return thread->getContext();
}

ANGLE_INLINE Context *GetValidGlobalContext()
{
#if defined(ANGLE_PLATFORM_ANDROID)
    // TODO: Replace this branch with a compile time flag (http://anglebug.com/4764)
    if (gUseAndroidOpenGLTlsSlot)
    {
        Context *context =
            static_cast<gl::Context *>(ANGLE_ANDROID_GET_GL_TLS()[kAndroidOpenGLTlsSlot]);
        if (context && !context->isContextLost())
        {
            return context;
        }
    }
#endif

    if (gSingleThreadedContext && !gSingleThreadedContext->isContextLost())
    {
        return gSingleThreadedContext;
    }

    egl::Thread *thread = egl::GetCurrentThread();
    return thread->getValidContext();
}

ANGLE_INLINE std::unique_lock<angle::GlobalMutex> GetShareGroupLock(const Context *context)
{
    return context->isShared() ? std::unique_lock<angle::GlobalMutex>(egl::GetGlobalMutex())
                               : std::unique_lock<angle::GlobalMutex>();
}
}  // namespace gl

#endif  // LIBGLESV2_GLOBALSTATE_H_
