// Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Reference EGL implementation to support EGL sync objects and OpenWF extensions

#include "eglprivate.h"

const TInt KEglMajorVersion = 1;

const TInt KEglMinorVersion = 4;

#define KEglClientApis  ""

#define KEglVendor      "Nokia"

#define KEglVersion     "1.4 Reference EGL"

#define KEglExtensions  "EGL_KHR_reusable_sync" /* additonal extensions should be added beginning with a space */ \

                        " EGL_NOK__private__signal_sync"

// Helper macros for repetitive task

//

#define CHECK_FOR_NULL_DISPLAY(handle, retval) \

    if (handle == EGL_NO_DISPLAY) \

        { \

        SetError(EGL_BAD_DISPLAY); \

        return retval; \

        }

#define CHECK_FOR_NULL_SYNCOBJ(handle, retval) \

    if (handle == EGL_NO_SYNC_KHR) \

        { \

        SetError(EGL_BAD_PARAMETER); \

        return retval; \

        }

#define GET_DISPLAY_RETURN_IF_ERR(drv, display, handle, retval) \

    CEglDisplay* display = iDriver.FindDisplay(handle); \

    if (!display) \

        { \

        drv.Unlock(); \

        SetError(EGL_BAD_DISPLAY); \

        return retval; \

        } \

    if (!display->IsInitialized()) \

        { \

        drv.Unlock(); \

        SetError(EGL_NOT_INITIALIZED); \

        return retval; \

        }

#define GET_SYNCOBJ_RETURN_IF_ERR(drv, display, sync, handle, retval) \

    CEglSync* sync = display->FindSyncObj(handle); \

    if (!sync) \

        { \

        drv.Unlock(); \

        SetError(EGL_BAD_PARAMETER); \

        return retval; \

        } \

    if (sync->IsDestroyed()) /* sync obj has been marked as destroyed */ \

        { \

        drv.Unlock(); \

        SetError(EGL_BAD_PARAMETER); \

        return retval; \

        }

CEglThreadSession::CEglThreadSession(CEglDriver& aDriver):

	iDriver(aDriver),

	iError(EGL_SUCCESS)

	{

	}

CEglThreadSession::~CEglThreadSession()

	{

	CEglDriver::Close();

	}

CEglThreadSession* CEglThreadSession::Static()

	{

	CEglThreadSession* es = reinterpret_cast<CEglThreadSession*>(Dll::Tls());

	if (es)

		{

		return es;

		}

	const TInt err = CEglDriver::Open();

	if (err != KErrNone)

		{

		return NULL;

		}

	// CEglDriver is reference counted. As we successfuly open the driver, pls.iDriver will be non-null

	// and it should be safe to cache the pointer inside CEglThreadSession

	CEglDriver* drv = CEglDriver::GetDriver();

	__ASSERT_DEBUG(drv, User::Panic(KEglPanicCategory, EEglPanicDriverNull));

	// create session object on default thread's heap

	es = new CEglThreadSession(*drv);

	if (!es || Dll::SetTls(es)!= KErrNone)

		{

		delete es;

		return NULL;

		}

	return es;

	}

void CEglThreadSession::SetError(EGLint aError)

	{

	// EGL spec section 3.1, GetError will return the status of the most recent EGL function call

	// so we will always override the error status

	iError = aError;

	}

EGLint CEglThreadSession::EglGetError()

	{

	// eglGetError always succeed so it will set error state to EGL_SUCCESS

	const EGLint lastError = iError;

	iError = EGL_SUCCESS;

	return lastError;

	}

EGLDisplay CEglThreadSession::EglGetDisplay(NativeDisplayType aDisplayId)

    {

    // EGL spec section 3.2: we do not need to raise EGL error when GetDisplay fails

    SetError(EGL_SUCCESS);

    if (aDisplayId != EGL_DEFAULT_DISPLAY)

        {

        return EGL_NO_DISPLAY;

        }

    // default display is created when driver is initialised the first time and will

    // be destroyed when all threads within process have called eglReleaseThread

    return KEglDefaultDisplayHandle;

    }

EGLBoolean CEglThreadSession::EglInitialize(EGLDisplay aDisplay, EGLint* aMajor, EGLint* aMinor)

    {

    SetError(EGL_SUCCESS);

    CHECK_FOR_NULL_DISPLAY(aDisplay, EGL_FALSE)

    iDriver.Lock();

    CEglDisplay* display = iDriver.FindDisplay(aDisplay);

    if (!display)

        {

        iDriver.Unlock();

        SetError(EGL_BAD_DISPLAY);

        return EGL_FALSE;

        }

    const TInt err = display->Initialize();

    iDriver.Unlock();

    if (err != KErrNone)

        {

        SetError(EGL_NOT_INITIALIZED);

        return EGL_FALSE;

        }

        {

        *aMajor = KEglMajorVersion;

        }

    if (aMinor)

        {

        *aMinor = KEglMinorVersion;

        }

    return EGL_TRUE;

    }

EGLBoolean CEglThreadSession::EglTerminate(EGLDisplay aDisplay)

    {

    SetError(EGL_SUCCESS);

    CHECK_FOR_NULL_DISPLAY(aDisplay, EGL_FALSE)

    iDriver.Lock();

    CEglDisplay* display = iDriver.FindDisplay(aDisplay);

    if (!display)

        {

        iDriver.Unlock();

        SetError(EGL_BAD_DISPLAY);

        return EGL_FALSE;

        }

    display->Terminate();

    iDriver.Unlock();

    return EGL_TRUE;

    }

TFuncPtrEglProc CEglThreadSession::EglGetProcAddress(const char* aName)

    {

    SetError(EGL_SUCCESS);

    if(!aName)

        {

        return NULL;

        }

    // EGL spec does not mention about raising error if requested function not found

    // This implementation does not set error and leave thread state unmodified

    return iDriver.GetProcAddress(aName);

    }

const char* CEglThreadSession::EglQueryString(EGLDisplay aDisplay, EGLint aName)

    {

    SetError(EGL_SUCCESS);

    const char* str = NULL;

    CHECK_FOR_NULL_DISPLAY(aDisplay, str)

    iDriver.Lock();

    GET_DISPLAY_RETURN_IF_ERR(iDriver, display, aDisplay, str)

    iDriver.Unlock();

    switch (aName)

        {

        case EGL_CLIENT_APIS:

            str = KEglClientApis;

            break;

        case EGL_EXTENSIONS:

            str = KEglExtensions;

            break;

        case EGL_VENDOR:

            str = KEglVendor;

            break;

        case EGL_VERSION:

            str = KEglVersion;

            break;

        default:

            SetError(EGL_BAD_PARAMETER);

            break;

        }

    return str;

    }

EGLSyncKHR CEglThreadSession::EglCreateSyncKhr(EGLDisplay aDisplay, EGLenum aType, const EGLint *aAttribList)

    {

    SetError(EGL_SUCCESS);

    CHECK_FOR_NULL_DISPLAY(aDisplay, EGL_NO_SYNC_KHR)

    if (aType != EGL_SYNC_REUSABLE_KHR || (aAttribList && *aAttribList != EGL_NONE))

        {

        SetError(EGL_BAD_ATTRIBUTE);

        return EGL_NO_SYNC_KHR;

        }

    iDriver.Lock();

    GET_DISPLAY_RETURN_IF_ERR(iDriver, display, aDisplay, EGL_NO_SYNC_KHR)

    CEglSync* syncObj = display->CreateSyncObj();

    iDriver.Unlock();

    if (!syncObj)

        {

        SetError(EGL_BAD_ALLOC);

        return EGL_NO_SYNC_KHR;

        }

    return reinterpret_cast<EGLSyncKHR>(syncObj);

    }

EGLBoolean CEglThreadSession::EglDestroySyncKhr(EGLDisplay aDisplay, EGLSyncKHR aSync)

    {

    SetError(EGL_SUCCESS);

    CHECK_FOR_NULL_DISPLAY(aDisplay, EGL_FALSE)

    CHECK_FOR_NULL_SYNCOBJ(aSync, EGL_FALSE)

    iDriver.Lock();

    GET_DISPLAY_RETURN_IF_ERR(iDriver, display, aDisplay, EGL_FALSE)

    const TInt err = display->DestroySyncObj(aSync);

    iDriver.Unlock();

    if (err != KErrNone)

        {

        SetError(EGL_BAD_PARAMETER);

        return EGL_FALSE;

        }

    return EGL_TRUE;

    }

EGLint CEglThreadSession::EglClientWaitSyncKhr(EGLDisplay aDisplay, EGLSyncKHR aSync, EGLint aFlags, EGLTimeKHR aTimeout)

    {

    SetError(EGL_SUCCESS);

    CHECK_FOR_NULL_DISPLAY(aDisplay, EGL_FALSE)

    CHECK_FOR_NULL_SYNCOBJ(aSync, EGL_FALSE)

    const EGLint supportedFlags = EGL_SYNC_FLUSH_COMMANDS_BIT_KHR;

    if (aFlags & ~supportedFlags)

        {

        SetError(EGL_BAD_PARAMETER);

        return EGL_FALSE;

        }

    iDriver.Lock();

    GET_DISPLAY_RETURN_IF_ERR(iDriver, display, aDisplay, EGL_FALSE)

    GET_SYNCOBJ_RETURN_IF_ERR(iDriver, display, syncObj, aSync, EGL_FALSE)

    // increment refcount to mark this sync obj in use and prevent it from being destroyed when other thread calls eglDestroySyncKHR or eglTerminate

    syncObj->Open();

    // release display lock as we're going to wait on sync object after this point, not releasing display lock at this 

    // point will cause deadlock

    iDriver.Unlock();

    // sync obj refcount has been incremented so it won't get destroyed even if other thread call eglDestroySyncKHR or eglTerminate

    // at this point

    // we do not support client apis, so flushing flags will be ignored in this implementation

    EGLint err = syncObj->Wait(aTimeout);

    // decrement refcount

    // sync obj will be destroyted if refcount is 0 e.g. other thread issues eglDestroySyncKHR or eglTerminate while this thread

    // is waiting on it

    iDriver.Lock();

    syncObj->Close();

    iDriver.Unlock();

    // we do not check error here as it is passed back to caller

    return err;

    }

EGLBoolean CEglThreadSession::EglSignalSyncKhr(EGLDisplay aDisplay, EGLSyncKHR aSync, EGLenum aMode)

    {

    const EGLint err = EglSignalSyncInternal(aDisplay, aSync, aMode);

    SetError(err);

    return err == EGL_SUCCESS;

    }

EGLint CEglThreadSession::EglSignalSyncInternal(EGLDisplay aDisplay, EGLSyncKHR aSync, EGLenum aMode)

    {

    if (aDisplay == EGL_NO_DISPLAY)

        {

        return EGL_BAD_DISPLAY;

        }

    if (aSync == EGL_NO_SYNC_KHR)

        {

        return EGL_BAD_PARAMETER;