/** 
 * @file llwindowwin32.cpp
 * @brief Platform-dependent implementation of llwindow
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#if LL_WINDOWS && !LL_MESA_HEADLESS

#include "llwindowwin32.h"

// LLWindow library includes
#include "llkeyboardwin32.h"
#include "lldragdropwin32.h"
#include "llpreeditor.h"
#include "llwindowcallbacks.h"

// Linden library includes
#include "llerror.h"
#include "llgl.h"
#include "llstring.h"
#include "lldir.h"
#include "llglslshader.h"

// System includes
#include <commdlg.h>
#include <WinUser.h>
#include <mapi.h>
#include <process.h>	// for _spawn
#include <shellapi.h>
#include <fstream>
#include <Imm.h>

// Require DirectInput version 8
#define DIRECTINPUT_VERSION 0x0800

#include <dinput.h>
#include <Dbt.h.>

#include "llmemtype.h"
// culled from winuser.h
#ifndef WM_MOUSEWHEEL /* Added to be compatible with later SDK's */
const S32	WM_MOUSEWHEEL = 0x020A;
#endif
#ifndef WHEEL_DELTA /* Added to be compatible with later SDK's */
const S32	WHEEL_DELTA = 120;     /* Value for rolling one detent */
#endif
const S32	MAX_MESSAGE_PER_UPDATE = 20;
const S32	BITS_PER_PIXEL = 32;
const S32	MAX_NUM_RESOLUTIONS = 32;
const F32	ICON_FLASH_TIME = 0.5f;

extern BOOL gDebugWindowProc;

LPWSTR gIconResource = IDI_APPLICATION;

LLW32MsgCallback gAsyncMsgCallback = NULL;

//
// LLWindowWin32
//

void show_window_creation_error(const std::string& title)
{
	LL_WARNS("Window") << title << LL_ENDL;
}

//static
BOOL LLWindowWin32::sIsClassRegistered = FALSE;

BOOL	LLWindowWin32::sLanguageTextInputAllowed = TRUE;
BOOL	LLWindowWin32::sWinIMEOpened = FALSE;
HKL		LLWindowWin32::sWinInputLocale = 0;
DWORD	LLWindowWin32::sWinIMEConversionMode = IME_CMODE_NATIVE;
DWORD	LLWindowWin32::sWinIMESentenceMode = IME_SMODE_AUTOMATIC;
LLCoordWindow LLWindowWin32::sWinIMEWindowPosition(-1,-1);

// The following class LLWinImm delegates Windows IMM APIs.
// We need this because some language versions of Windows,
// e.g., US version of Windows XP, doesn't install IMM32.DLL
// as a default, and we can't link against imm32.lib statically.
// I believe DLL loading of this type is best suited to do
// in a static initialization of a class.  What I'm not sure is
// whether it follows the Linden Conding Standard... 
// See http://wiki.secondlife.com/wiki/Coding_standards#Static_Members

class LLWinImm
{
public:
	static bool		isAvailable() { return sTheInstance.mHImmDll != NULL; }

public:
	// Wrappers for IMM API.
	static BOOL		isIME(HKL hkl);															
	static HWND		getDefaultIMEWnd(HWND hwnd);
	static HIMC		getContext(HWND hwnd);													
	static BOOL		releaseContext(HWND hwnd, HIMC himc);
	static BOOL		getOpenStatus(HIMC himc);												
	static BOOL		setOpenStatus(HIMC himc, BOOL status);									
	static BOOL		getConversionStatus(HIMC himc, LPDWORD conversion, LPDWORD sentence);	
	static BOOL		setConversionStatus(HIMC himc, DWORD conversion, DWORD sentence);		
	static BOOL		getCompositionWindow(HIMC himc, LPCOMPOSITIONFORM form);					
	static BOOL		setCompositionWindow(HIMC himc, LPCOMPOSITIONFORM form);					
	static LONG		getCompositionString(HIMC himc, DWORD index, LPVOID data, DWORD length);
	static BOOL		setCompositionString(HIMC himc, DWORD index, LPVOID pComp, DWORD compLength, LPVOID pRead, DWORD readLength);
	static BOOL		setCompositionFont(HIMC himc, LPLOGFONTW logfont);
	static BOOL		setCandidateWindow(HIMC himc, LPCANDIDATEFORM candidate_form);
	static BOOL		notifyIME(HIMC himc, DWORD action, DWORD index, DWORD value);

private:
	LLWinImm();
	~LLWinImm();

private:
	// Pointers to IMM API.
	BOOL	 	(WINAPI *mImmIsIME)(HKL);
	HWND		(WINAPI *mImmGetDefaultIMEWnd)(HWND);
	HIMC		(WINAPI *mImmGetContext)(HWND);
	BOOL		(WINAPI *mImmReleaseContext)(HWND, HIMC);
	BOOL		(WINAPI *mImmGetOpenStatus)(HIMC);
	BOOL		(WINAPI *mImmSetOpenStatus)(HIMC, BOOL);
	BOOL		(WINAPI *mImmGetConversionStatus)(HIMC, LPDWORD, LPDWORD);
	BOOL		(WINAPI *mImmSetConversionStatus)(HIMC, DWORD, DWORD);
	BOOL		(WINAPI *mImmGetCompostitionWindow)(HIMC, LPCOMPOSITIONFORM);
	BOOL		(WINAPI *mImmSetCompostitionWindow)(HIMC, LPCOMPOSITIONFORM);
	LONG		(WINAPI *mImmGetCompositionString)(HIMC, DWORD, LPVOID, DWORD);
	BOOL		(WINAPI *mImmSetCompositionString)(HIMC, DWORD, LPVOID, DWORD, LPVOID, DWORD);
	BOOL		(WINAPI *mImmSetCompositionFont)(HIMC, LPLOGFONTW);
	BOOL		(WINAPI *mImmSetCandidateWindow)(HIMC, LPCANDIDATEFORM);
	BOOL		(WINAPI *mImmNotifyIME)(HIMC, DWORD, DWORD, DWORD);

private:
	HMODULE		mHImmDll;
	static LLWinImm sTheInstance;
};

LLWinImm LLWinImm::sTheInstance;

LLWinImm::LLWinImm() : mHImmDll(NULL)
{
	// Check system metrics 
	if ( !GetSystemMetrics( SM_DBCSENABLED ) )
		return;
	

	mHImmDll = LoadLibraryA("Imm32");
	if (mHImmDll != NULL)
	{
		mImmIsIME               = (BOOL (WINAPI *)(HKL))                    GetProcAddress(mHImmDll, "ImmIsIME");
		mImmGetDefaultIMEWnd	= (HWND (WINAPI *)(HWND))					GetProcAddress(mHImmDll, "ImmGetDefaultIMEWnd");
		mImmGetContext          = (HIMC (WINAPI *)(HWND))                   GetProcAddress(mHImmDll, "ImmGetContext");
		mImmReleaseContext      = (BOOL (WINAPI *)(HWND, HIMC))             GetProcAddress(mHImmDll, "ImmReleaseContext");
		mImmGetOpenStatus       = (BOOL (WINAPI *)(HIMC))                   GetProcAddress(mHImmDll, "ImmGetOpenStatus");
		mImmSetOpenStatus       = (BOOL (WINAPI *)(HIMC, BOOL))             GetProcAddress(mHImmDll, "ImmSetOpenStatus");
		mImmGetConversionStatus = (BOOL (WINAPI *)(HIMC, LPDWORD, LPDWORD)) GetProcAddress(mHImmDll, "ImmGetConversionStatus");
		mImmSetConversionStatus = (BOOL (WINAPI *)(HIMC, DWORD, DWORD))     GetProcAddress(mHImmDll, "ImmSetConversionStatus");
		mImmGetCompostitionWindow = (BOOL (WINAPI *)(HIMC, LPCOMPOSITIONFORM))   GetProcAddress(mHImmDll, "ImmGetCompositionWindow");
		mImmSetCompostitionWindow = (BOOL (WINAPI *)(HIMC, LPCOMPOSITIONFORM))   GetProcAddress(mHImmDll, "ImmSetCompositionWindow");
		mImmGetCompositionString= (LONG (WINAPI *)(HIMC, DWORD, LPVOID, DWORD))					GetProcAddress(mHImmDll, "ImmGetCompositionStringW");
		mImmSetCompositionString= (BOOL (WINAPI *)(HIMC, DWORD, LPVOID, DWORD, LPVOID, DWORD))	GetProcAddress(mHImmDll, "ImmSetCompositionStringW");
		mImmSetCompositionFont  = (BOOL (WINAPI *)(HIMC, LPLOGFONTW))		GetProcAddress(mHImmDll, "ImmSetCompositionFontW");
		mImmSetCandidateWindow  = (BOOL (WINAPI *)(HIMC, LPCANDIDATEFORM))  GetProcAddress(mHImmDll, "ImmSetCandidateWindow");
		mImmNotifyIME			= (BOOL (WINAPI *)(HIMC, DWORD, DWORD, DWORD))	GetProcAddress(mHImmDll, "ImmNotifyIME");

		if (mImmIsIME == NULL ||
			mImmGetDefaultIMEWnd == NULL ||
			mImmGetContext == NULL ||
			mImmReleaseContext == NULL ||
			mImmGetOpenStatus == NULL ||
			mImmSetOpenStatus == NULL ||
			mImmGetConversionStatus == NULL ||
			mImmSetConversionStatus == NULL ||
			mImmGetCompostitionWindow == NULL ||
			mImmSetCompostitionWindow == NULL ||
			mImmGetCompositionString == NULL ||
			mImmSetCompositionString == NULL ||
			mImmSetCompositionFont == NULL ||
			mImmSetCandidateWindow == NULL ||
			mImmNotifyIME == NULL)
		{
			// If any of the above API entires are not found, we can't use IMM API.  
			// So, turn off the IMM support.  We should log some warning message in 
			// the case, since it is very unusual; these APIs are available from 
			// the beginning, and all versions of IMM32.DLL should have them all.  
			// Unfortunately, this code may be executed before initialization of 
			// the logging channel (llwarns), and we can't do it here...  Yes, this 
			// is one of disadvantages to use static constraction to DLL loading. 
			FreeLibrary(mHImmDll);
			mHImmDll = NULL;

			// If we unload the library, make sure all the function pointers are cleared
			mImmIsIME = NULL;
			mImmGetDefaultIMEWnd = NULL;
			mImmGetContext = NULL;
			mImmReleaseContext = NULL;
			mImmGetOpenStatus = NULL;
			mImmSetOpenStatus = NULL;
			mImmGetConversionStatus = NULL;
			mImmSetConversionStatus = NULL;
			mImmGetCompostitionWindow = NULL;
			mImmSetCompostitionWindow = NULL;
			mImmGetCompositionString = NULL;
			mImmSetCompositionString = NULL;
			mImmSetCompositionFont = NULL;
			mImmSetCandidateWindow = NULL;
			mImmNotifyIME = NULL;
		}
	}
}


// static 
BOOL	LLWinImm::isIME(HKL hkl)															
{ 
	if ( sTheInstance.mImmIsIME )
		return sTheInstance.mImmIsIME(hkl); 
	return FALSE;
}

// static 
HIMC		LLWinImm::getContext(HWND hwnd)
{
	if ( sTheInstance.mImmGetContext )
		return sTheInstance.mImmGetContext(hwnd); 
	return 0;
}

//static 
BOOL		LLWinImm::releaseContext(HWND hwnd, HIMC himc)
{ 
	if ( sTheInstance.mImmIsIME )
		return sTheInstance.mImmReleaseContext(hwnd, himc); 
	return FALSE;
}

// static 
BOOL		LLWinImm::getOpenStatus(HIMC himc)
{ 
	if ( sTheInstance.mImmGetOpenStatus )
		return sTheInstance.mImmGetOpenStatus(himc); 
	return FALSE;
}

// static 
BOOL		LLWinImm::setOpenStatus(HIMC himc, BOOL status)									
{ 
	if ( sTheInstance.mImmSetOpenStatus )
		return sTheInstance.mImmSetOpenStatus(himc, status); 
	return FALSE;
}

// static 
BOOL		LLWinImm::getConversionStatus(HIMC himc, LPDWORD conversion, LPDWORD sentence)	
{ 
	if ( sTheInstance.mImmGetConversionStatus )
		return sTheInstance.mImmGetConversionStatus(himc, conversion, sentence); 
	return FALSE;
}

// static 
BOOL		LLWinImm::setConversionStatus(HIMC himc, DWORD conversion, DWORD sentence)		
{ 
	if ( sTheInstance.mImmSetConversionStatus )
		return sTheInstance.mImmSetConversionStatus(himc, conversion, sentence); 
	return FALSE;
}

// static 
BOOL		LLWinImm::getCompositionWindow(HIMC himc, LPCOMPOSITIONFORM form)					
{ 
	if ( sTheInstance.mImmGetCompostitionWindow )
		return sTheInstance.mImmGetCompostitionWindow(himc, form);	
	return FALSE;
}

// static 
BOOL		LLWinImm::setCompositionWindow(HIMC himc, LPCOMPOSITIONFORM form)					
{ 
	if ( sTheInstance.mImmSetCompostitionWindow )
		return sTheInstance.mImmSetCompostitionWindow(himc, form);	
	return FALSE;
}


// static 
LONG		LLWinImm::getCompositionString(HIMC himc, DWORD index, LPVOID data, DWORD length)					
{ 
	if ( sTheInstance.mImmGetCompositionString )
		return sTheInstance.mImmGetCompositionString(himc, index, data, length);	
	return FALSE;
}


// static 
BOOL		LLWinImm::setCompositionString(HIMC himc, DWORD index, LPVOID pComp, DWORD compLength, LPVOID pRead, DWORD readLength)					
{ 
	if ( sTheInstance.mImmSetCompositionString )
		return sTheInstance.mImmSetCompositionString(himc, index, pComp, compLength, pRead, readLength);	
	return FALSE;
}

// static 
BOOL		LLWinImm::setCompositionFont(HIMC himc, LPLOGFONTW pFont)					
{ 
	if ( sTheInstance.mImmSetCompositionFont )
		return sTheInstance.mImmSetCompositionFont(himc, pFont);	
	return FALSE;
}

// static 
BOOL		LLWinImm::setCandidateWindow(HIMC himc, LPCANDIDATEFORM form)					
{ 
	if ( sTheInstance.mImmSetCandidateWindow )
		return sTheInstance.mImmSetCandidateWindow(himc, form);	
	return FALSE;
}

// static 
BOOL		LLWinImm::notifyIME(HIMC himc, DWORD action, DWORD index, DWORD value)					
{ 
	if ( sTheInstance.mImmNotifyIME )
		return sTheInstance.mImmNotifyIME(himc, action, index, value);	
	return FALSE;
}




// ----------------------------------------------------------------------------------------
LLWinImm::~LLWinImm()
{
	if (mHImmDll != NULL)
	{
		FreeLibrary(mHImmDll);
		mHImmDll = NULL;
	}
}


LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
							 const std::string& title, const std::string& name, S32 x, S32 y, S32 width,
							 S32 height, U32 flags, 
							 BOOL fullscreen, BOOL clearBg,
							 BOOL disable_vsync, BOOL use_gl,
							 BOOL ignore_pixel_depth,
							 U32 fsaa_samples)
	: LLWindow(callbacks, fullscreen, flags)
{
	mFSAASamples = fsaa_samples;
	mIconResource = gIconResource;
	mOverrideAspectRatio = 0.f;
	mNativeAspectRatio = 0.f;
	mMousePositionModified = FALSE;
	mInputProcessingPaused = FALSE;
	mPreeditor = NULL;
	mKeyCharCode = 0;
	mKeyScanCode = 0;
	mKeyVirtualKey = 0;
	mhDC = NULL;
	mhRC = NULL;

	// Initialize the keyboard
	gKeyboard = new LLKeyboardWin32();
	gKeyboard->setCallbacks(callbacks);

	// Initialize the Drag and Drop functionality
	mDragDrop = new LLDragDropWin32;

	// Initialize (boot strap) the Language text input management,
	// based on the system's (user's) default settings.
	allowLanguageTextInput(mPreeditor, FALSE);

	WNDCLASS		wc;
	RECT			window_rect;

	// Set the window title
	if (title.empty())
	{
		mWindowTitle = new WCHAR[50];
		wsprintf(mWindowTitle, L"OpenGL Window");
	}
	else
	{
		mWindowTitle = new WCHAR[256]; // Assume title length < 255 chars.
		mbstowcs(mWindowTitle, title.c_str(), 255);
		mWindowTitle[255] = 0;
	}

	// Set the window class name
	if (name.empty())
	{
		mWindowClassName = new WCHAR[50];
		wsprintf(mWindowClassName, L"OpenGL Window");
	}
	else
	{
		mWindowClassName = new WCHAR[256]; // Assume title length < 255 chars.
		mbstowcs(mWindowClassName, name.c_str(), 255);
		mWindowClassName[255] = 0;
	}


	// We're not clipping yet
	SetRect( &mOldMouseClip, 0, 0, 0, 0 );

	// Make an instance of our window then define the window class
	mhInstance = GetModuleHandle(NULL);
	mWndProc = NULL;

	mSwapMethod = SWAP_METHOD_UNDEFINED;

	// No WPARAM yet.
	mLastSizeWParam = 0;

	// Windows GDI rects don't include rightmost pixel
	window_rect.left = (long) 0;
	window_rect.right = (long) width;
	window_rect.top = (long) 0;
	window_rect.bottom = (long) height;

	// Grab screen size to sanitize the window
	S32 window_border_y = GetSystemMetrics(SM_CYBORDER);
	S32 virtual_screen_x = GetSystemMetrics(SM_XVIRTUALSCREEN); 
	S32 virtual_screen_y = GetSystemMetrics(SM_YVIRTUALSCREEN); 
	S32 virtual_screen_width = GetSystemMetrics(SM_CXVIRTUALSCREEN);
	S32 virtual_screen_height = GetSystemMetrics(SM_CYVIRTUALSCREEN);

	if (x < virtual_screen_x) x = virtual_screen_x;
	if (y < virtual_screen_y - window_border_y) y = virtual_screen_y - window_border_y;

	if (x + width > virtual_screen_x + virtual_screen_width) x = virtual_screen_x + virtual_screen_width - width;
	if (y + height > virtual_screen_y + virtual_screen_height) y = virtual_screen_y + virtual_screen_height - height;

	if (!sIsClassRegistered)
	{
		// Force redraw when resized and create a private device context

		// Makes double click messages.
		wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC | CS_DBLCLKS;

		// Set message handler function
		wc.lpfnWndProc = (WNDPROC) mainWindowProc;

		// unused
		wc.cbClsExtra = 0;
		wc.cbWndExtra = 0;

		wc.hInstance = mhInstance;
		wc.hIcon = LoadIcon(mhInstance, mIconResource);

		// We will set the cursor ourselves
		wc.hCursor = NULL;

		// background color is not used
		if (clearBg)
		{
			wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
		}
		else
		{
			wc.hbrBackground = (HBRUSH) NULL;
		}

		// we don't use windows menus
		wc.lpszMenuName = NULL;

		wc.lpszClassName = mWindowClassName;

		if (!RegisterClass(&wc))
		{
			OSMessageBox(mCallbacks->translateString("MBRegClassFailed"), 
				mCallbacks->translateString("MBError"), OSMB_OK);
			return;
		}
		sIsClassRegistered = TRUE;
	}

	//-----------------------------------------------------------------------
	// Get the current refresh rate
	//-----------------------------------------------------------------------

	DEVMODE dev_mode;
	::ZeroMemory(&dev_mode, sizeof(DEVMODE));
	dev_mode.dmSize = sizeof(DEVMODE);
	DWORD current_refresh;
	if (EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dev_mode))
	{
		current_refresh = dev_mode.dmDisplayFrequency;
		mNativeAspectRatio = ((F32)dev_mode.dmPelsWidth) / ((F32)dev_mode.dmPelsHeight);
	}
	else
	{
		current_refresh = 60;
	}

	//-----------------------------------------------------------------------
	// Drop resolution and go fullscreen
	// use a display mode with our desired size and depth, with a refresh
	// rate as close at possible to the users' default
	//-----------------------------------------------------------------------
	if (mFullscreen)
	{
		BOOL success = FALSE;
		DWORD closest_refresh = 0;

		for (S32 mode_num = 0;; mode_num++)
		{
			if (!EnumDisplaySettings(NULL, mode_num, &dev_mode))
			{
				break;
			}

			if (dev_mode.dmPelsWidth == width &&
				dev_mode.dmPelsHeight == height &&
				dev_mode.dmBitsPerPel == BITS_PER_PIXEL)
			{
				success = TRUE;
				if ((dev_mode.dmDisplayFrequency - current_refresh)
					< (closest_refresh - current_refresh))
				{
					closest_refresh = dev_mode.dmDisplayFrequency;
				}
			}
		}

		if (closest_refresh == 0)
		{
			LL_WARNS("Window") << "Couldn't find display mode " << width << " by " << height << " at " << BITS_PER_PIXEL << " bits per pixel" << LL_ENDL;
			//success = FALSE;

			if (!EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dev_mode))
			{
				success = FALSE;
			}
			else
			{
				if (dev_mode.dmBitsPerPel == BITS_PER_PIXEL)
				{
					LL_WARNS("Window") << "Current BBP is OK falling back to that" << LL_ENDL;
					window_rect.right=width=dev_mode.dmPelsWidth;
					window_rect.bottom=height=dev_mode.dmPelsHeight;
					success = TRUE;
				}
				else
				{
					LL_WARNS("Window") << "Current BBP is BAD" << LL_ENDL;
					success = FALSE;
				}
			}
		}

		// If we found a good resolution, use it.
		if (success)
		{
			success = setDisplayResolution(width, height, BITS_PER_PIXEL, closest_refresh);
		}

		// Keep a copy of the actual current device mode in case we minimize 
		// and change the screen resolution.   JC
		EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dev_mode);

		// If it failed, we don't want to run fullscreen
		if (success)
		{
			mFullscreen = TRUE;
			mFullscreenWidth   = dev_mode.dmPelsWidth;
			mFullscreenHeight  = dev_mode.dmPelsHeight;
			mFullscreenBits    = dev_mode.dmBitsPerPel;
			mFullscreenRefresh = dev_mode.dmDisplayFrequency;

			LL_INFOS("Window") << "Running at " << dev_mode.dmPelsWidth
				<< "x"   << dev_mode.dmPelsHeight
				<< "x"   << dev_mode.dmBitsPerPel
				<< " @ " << dev_mode.dmDisplayFrequency
				<< LL_ENDL;
		}
		else
		{
			mFullscreen = FALSE;
			mFullscreenWidth   = -1;
			mFullscreenHeight  = -1;
			mFullscreenBits    = -1;
			mFullscreenRefresh = -1;

			std::map<std::string,std::string> args;
			args["[WIDTH]"] = llformat("%d", width);
			args["[HEIGHT]"] = llformat ("%d", height);
			OSMessageBox(mCallbacks->translateString("MBFullScreenErr", args),
				mCallbacks->translateString("MBError"), OSMB_OK);
		}
	}

	// TODO: add this after resolving _WIN32_WINNT issue
	//	if (!fullscreen)
	//	{
	//		TRACKMOUSEEVENT track_mouse_event;
	//		track_mouse_event.cbSize = sizeof( TRACKMOUSEEVENT );
	//		track_mouse_event.dwFlags = TME_LEAVE;
	//		track_mouse_event.hwndTrack = mWindowHandle;
	//		track_mouse_event.dwHoverTime = HOVER_DEFAULT;
	//		TrackMouseEvent( &track_mouse_event ); 
	//	}


	//-----------------------------------------------------------------------
	// Create GL drawing context
	//-----------------------------------------------------------------------
	LLCoordScreen windowPos(x,y);
	LLCoordScreen windowSize(window_rect.right - window_rect.left,
							 window_rect.bottom - window_rect.top);
	if (!switchContext(mFullscreen, windowSize, TRUE, &windowPos))
	{
		return;
	}
	
	//start with arrow cursor
	initCursors();
	setCursor( UI_CURSOR_ARROW );

	// Initialize (boot strap) the Language text input management,
	// based on the system's (or user's) default settings.
	allowLanguageTextInput(NULL, FALSE);
}


LLWindowWin32::~LLWindowWin32()
{
	delete mDragDrop;

	delete [] mWindowTitle;
	mWindowTitle = NULL;

	delete [] mSupportedResolutions;
	mSupportedResolutions = NULL;

	delete mWindowClassName;
	mWindowClassName = NULL;
}

void LLWindowWin32::show()
{
	ShowWindow(mWindowHandle, SW_SHOW);
	SetForegroundWindow(mWindowHandle);
	SetFocus(mWindowHandle);
}

void LLWindowWin32::hide()
{
	setMouseClipping(FALSE);
	ShowWindow(mWindowHandle, SW_HIDE);
}

//virtual
void LLWindowWin32::minimize()
{
	setMouseClipping(FALSE);
	showCursor();
	ShowWindow(mWindowHandle, SW_MINIMIZE);
}

//virtual
void LLWindowWin32::restore()
{
	ShowWindow(mWindowHandle, SW_RESTORE);
	SetForegroundWindow(mWindowHandle);
	SetFocus(mWindowHandle);
}


// close() destroys all OS-specific code associated with a window.
// Usually called from LLWindowManager::destroyWindow()
void LLWindowWin32::close()
{
	LL_DEBUGS("Window") << "Closing LLWindowWin32" << LL_ENDL;
	// Is window is already closed?
	if (!mWindowHandle)
	{
		return;
	}

	mDragDrop->reset();

	// Make sure cursor is visible and we haven't mangled the clipping state.
	setMouseClipping(FALSE);
	showCursor();

	// Go back to screen mode written in the registry.
	if (mFullscreen)
	{
		resetDisplayResolution();
	}

	// Clean up remaining GL state
	LL_DEBUGS("Window") << "Shutting down GL" << LL_ENDL;
	gGLManager.shutdownGL();

	LL_DEBUGS("Window") << "Releasing Context" << LL_ENDL;
	if (mhRC)
	{
		if (!wglMakeCurrent(NULL, NULL))
		{
			LL_WARNS("Window") << "Release of DC and RC failed" << LL_ENDL;
		}

		if (!wglDeleteContext(mhRC))
		{
			LL_WARNS("Window") << "Release of rendering context failed" << LL_ENDL;
		}

		mhRC = NULL;
	}

	// Restore gamma to the system values.
	restoreGamma();

	if (mhDC && !ReleaseDC(mWindowHandle, mhDC))
	{
		LL_WARNS("Window") << "Release of ghDC failed" << LL_ENDL;
		mhDC = NULL;
	}

	LL_DEBUGS("Window") << "Destroying Window" << LL_ENDL;
	
	// Don't process events in our mainWindowProc any longer.
	SetWindowLong(mWindowHandle, GWL_USERDATA, NULL);

	// Make sure we don't leave a blank toolbar button.
	ShowWindow(mWindowHandle, SW_HIDE);

	// This causes WM_DESTROY to be sent *immediately*
	if (!DestroyWindow(mWindowHandle))
	{
		OSMessageBox(mCallbacks->translateString("MBDestroyWinFailed"),
			mCallbacks->translateString("MBShutdownErr"),
			OSMB_OK);
	}

	mWindowHandle = NULL;
}

BOOL LLWindowWin32::isValid()
{
	return (mWindowHandle != NULL);
}

BOOL LLWindowWin32::getVisible()
{
	return (mWindowHandle && IsWindowVisible(mWindowHandle));
}

BOOL LLWindowWin32::getMinimized()
{
	return (mWindowHandle && IsIconic(mWindowHandle));
}

BOOL LLWindowWin32::getMaximized()
{
	return (mWindowHandle && IsZoomed(mWindowHandle));
}

BOOL LLWindowWin32::maximize()
{
	BOOL success = FALSE;
	if (!mWindowHandle) return success;

	WINDOWPLACEMENT placement;
	placement.length = sizeof(WINDOWPLACEMENT);

	success = GetWindowPlacement(mWindowHandle, &placement);
	if (!success) return success;

	placement.showCmd = SW_MAXIMIZE;

	success = SetWindowPlacement(mWindowHandle, &placement);
	return success;
}

BOOL LLWindowWin32::getFullscreen()
{
	return mFullscreen;
}

BOOL LLWindowWin32::getPosition(LLCoordScreen *position)
{
	RECT window_rect;

	if (!mWindowHandle ||
		!GetWindowRect(mWindowHandle, &window_rect) ||
		NULL == position)
	{
		return FALSE;
	}

	position->mX = window_rect.left;
	position->mY = window_rect.top;
	return TRUE;
}

BOOL LLWindowWin32::getSize(LLCoordScreen *size)
{
	RECT window_rect;

	if (!mWindowHandle ||
		!GetWindowRect(mWindowHandle, &window_rect) ||
		NULL == size)
	{
		return FALSE;
	}

	size->mX = window_rect.right - window_rect.left;
	size->mY = window_rect.bottom - window_rect.top;
	return TRUE;
}

BOOL LLWindowWin32::getSize(LLCoordWindow *size)
{
	RECT client_rect;

	if (!mWindowHandle ||
		!GetClientRect(mWindowHandle, &client_rect) ||
		NULL == size)
	{
		return FALSE;
	}

	size->mX = client_rect.right - client_rect.left;
	size->mY = client_rect.bottom - client_rect.top;
	return TRUE;
}

BOOL LLWindowWin32::setPosition(const LLCoordScreen position)
{
	LLCoordScreen size;

	if (!mWindowHandle)
	{
		return FALSE;
	}
	getSize(&size);
	moveWindow(position, size);
	return TRUE;
}

BOOL LLWindowWin32::setSizeImpl(const LLCoordScreen size)
{
	LLCoordScreen position;

	getPosition(&position);
	if (!mWindowHandle)
	{
		return FALSE;
	}

	moveWindow(position, size);
	return TRUE;
}

// changing fullscreen resolution
BOOL LLWindowWin32::switchContext(BOOL fullscreen, const LLCoordScreen &size, BOOL disable_vsync, const LLCoordScreen * const posp)
{
	GLuint	pixel_format;
	DEVMODE dev_mode;
	::ZeroMemory(&dev_mode, sizeof(DEVMODE));
	dev_mode.dmSize = sizeof(DEVMODE);
	DWORD	current_refresh;
	DWORD	dw_ex_style;
	DWORD	dw_style;
	RECT	window_rect;
	S32 width = size.mX;
	S32 height = size.mY;
	BOOL auto_show = FALSE;

	if (mhRC)
	{
		auto_show = TRUE;
		resetDisplayResolution();
	}

	if (EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dev_mode))
	{
		current_refresh = dev_mode.dmDisplayFrequency;
	}
	else
	{
		current_refresh = 60;
	}

	gGLManager.shutdownGL();
	//destroy gl context
	if (mhRC)
	{
		if (!wglMakeCurrent(NULL, NULL))
		{
			LL_WARNS("Window") << "Release of DC and RC failed" << LL_ENDL;
		}

		if (!wglDeleteContext(mhRC))
		{
			LL_WARNS("Window") << "Release of rendering context failed" << LL_ENDL;
		}

		mhRC = NULL;
	}

	if (fullscreen)
	{
		mFullscreen = TRUE;
		BOOL success = FALSE;
		DWORD closest_refresh = 0;

		for (S32 mode_num = 0;; mode_num++)
		{
			if (!EnumDisplaySettings(NULL, mode_num, &dev_mode))
			{
				break;
			}

			if (dev_mode.dmPelsWidth == width &&
				dev_mode.dmPelsHeight == height &&
				dev_mode.dmBitsPerPel == BITS_PER_PIXEL)
			{
				success = TRUE;
				if ((dev_mode.dmDisplayFrequency - current_refresh)
					< (closest_refresh - current_refresh))
				{
					closest_refresh = dev_mode.dmDisplayFrequency;
				}
			}
		}

		if (closest_refresh == 0)
		{
			LL_WARNS("Window") << "Couldn't find display mode " << width << " by " << height << " at " << BITS_PER_PIXEL << " bits per pixel" << LL_ENDL;
			return FALSE;
		}

		// If we found a good resolution, use it.
		if (success)
		{
			success = setDisplayResolution(width, height, BITS_PER_PIXEL, closest_refresh);
		}

		// Keep a copy of the actual current device mode in case we minimize 
		// and change the screen resolution.   JC
		EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dev_mode);

		if (success)
		{
			mFullscreen = TRUE;
			mFullscreenWidth   = dev_mode.dmPelsWidth;
			mFullscreenHeight  = dev_mode.dmPelsHeight;
			mFullscreenBits    = dev_mode.dmBitsPerPel;
			mFullscreenRefresh = dev_mode.dmDisplayFrequency;

			LL_INFOS("Window") << "Running at " << dev_mode.dmPelsWidth
				<< "x"   << dev_mode.dmPelsHeight
				<< "x"   << dev_mode.dmBitsPerPel
				<< " @ " << dev_mode.dmDisplayFrequency
				<< LL_ENDL;

			window_rect.left = (long) 0;
			window_rect.right = (long) width;			// Windows GDI rects don't include rightmost pixel
			window_rect.top = (long) 0;
			window_rect.bottom = (long) height;
			dw_ex_style = WS_EX_APPWINDOW;
			dw_style = WS_POPUP;

			// Move window borders out not to cover window contents
			AdjustWindowRectEx(&window_rect, dw_style, FALSE, dw_ex_style);
		}
		// If it failed, we don't want to run fullscreen
		else
		{
			mFullscreen = FALSE;
			mFullscreenWidth   = -1;
			mFullscreenHeight  = -1;
			mFullscreenBits    = -1;
			mFullscreenRefresh = -1;

			LL_INFOS("Window") << "Unable to run fullscreen at " << width << "x" << height << LL_ENDL;
			return FALSE;
		}
	}
	else
	{
		mFullscreen = FALSE;
		window_rect.left = (long) (posp ? posp->mX : 0);
		window_rect.right = (long) width + window_rect.left;			// Windows GDI rects don't include rightmost pixel
		window_rect.top = (long) (posp ? posp->mY : 0);
		window_rect.bottom = (long) height + window_rect.top;
		// Window with an edge
		dw_ex_style = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
		dw_style = WS_OVERLAPPEDWINDOW;
	}

	// don't post quit messages when destroying old windows
	mPostQuit = FALSE;

	// create window
	DestroyWindow(mWindowHandle);
	mWindowHandle = CreateWindowEx(dw_ex_style,
		mWindowClassName,
		mWindowTitle,
		WS_CLIPSIBLINGS | WS_CLIPCHILDREN | dw_style,
		window_rect.left,								// x pos
		window_rect.top,								// y pos
		window_rect.right - window_rect.left,			// width
		window_rect.bottom - window_rect.top,			// height
		NULL,
		NULL,
		mhInstance,
		NULL);

	LL_INFOS("Window") << "window is created." << llendl ;

	//-----------------------------------------------------------------------
	// Create GL drawing context
	//-----------------------------------------------------------------------
	static PIXELFORMATDESCRIPTOR pfd =
	{
		sizeof(PIXELFORMATDESCRIPTOR), 
			1,
			PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER, 
			PFD_TYPE_RGBA,
			BITS_PER_PIXEL,
			0, 0, 0, 0, 0, 0,	// RGB bits and shift, unused
			8,					// alpha bits
			0,					// alpha shift
			0,					// accum bits
			0, 0, 0, 0,			// accum RGBA
			24,					// depth bits
			8,					// stencil bits, avi added for stencil test
			0,
			PFD_MAIN_PLANE,
			0,
			0, 0, 0
	};

	if (!(mhDC = GetDC(mWindowHandle)))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBDevContextErr"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (!(pixel_format = ChoosePixelFormat(mhDC, &pfd)))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBPixelFmtErr"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	// Verify what pixel format we actually received.
	if (!DescribePixelFormat(mhDC, pixel_format, sizeof(PIXELFORMATDESCRIPTOR),
		&pfd))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBPixelFmtDescErr"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	// (EXP-1765) dump pixel data to see if there is a pattern that leads to unreproducible crash
	LL_INFOS("Window") << "--- begin pixel format dump ---" << llendl ;
	LL_INFOS("Window") << "pixel_format is " << pixel_format << llendl ;
	LL_INFOS("Window") << "pfd.nSize:            " << pfd.nSize << llendl ;
	LL_INFOS("Window") << "pfd.nVersion:         " << pfd.nVersion << llendl ;
	LL_INFOS("Window") << "pfd.dwFlags:          0x" << std::hex << pfd.dwFlags << std::dec << llendl ;
	LL_INFOS("Window") << "pfd.iPixelType:       " << (int)pfd.iPixelType << llendl ;
	LL_INFOS("Window") << "pfd.cColorBits:       " << (int)pfd.cColorBits << llendl ;
	LL_INFOS("Window") << "pfd.cRedBits:         " << (int)pfd.cRedBits << llendl ;
	LL_INFOS("Window") << "pfd.cRedShift:        " << (int)pfd.cRedShift << llendl ;
	LL_INFOS("Window") << "pfd.cGreenBits:       " << (int)pfd.cGreenBits << llendl ;
	LL_INFOS("Window") << "pfd.cGreenShift:      " << (int)pfd.cGreenShift << llendl ;
	LL_INFOS("Window") << "pfd.cBlueBits:        " << (int)pfd.cBlueBits << llendl ;
	LL_INFOS("Window") << "pfd.cBlueShift:       " << (int)pfd.cBlueShift << llendl ;
	LL_INFOS("Window") << "pfd.cAlphaBits:       " << (int)pfd.cAlphaBits << llendl ;
	LL_INFOS("Window") << "pfd.cAlphaShift:      " << (int)pfd.cAlphaShift << llendl ;
	LL_INFOS("Window") << "pfd.cAccumBits:       " << (int)pfd.cAccumBits << llendl ;
	LL_INFOS("Window") << "pfd.cAccumRedBits:    " << (int)pfd.cAccumRedBits << llendl ;
	LL_INFOS("Window") << "pfd.cAccumGreenBits:  " << (int)pfd.cAccumGreenBits << llendl ;
	LL_INFOS("Window") << "pfd.cAccumBlueBits:   " << (int)pfd.cAccumBlueBits << llendl ;
	LL_INFOS("Window") << "pfd.cAccumAlphaBits:  " << (int)pfd.cAccumAlphaBits << llendl ;
	LL_INFOS("Window") << "pfd.cDepthBits:       " << (int)pfd.cDepthBits << llendl ;
	LL_INFOS("Window") << "pfd.cStencilBits:     " << (int)pfd.cStencilBits << llendl ;
	LL_INFOS("Window") << "pfd.cAuxBuffers:      " << (int)pfd.cAuxBuffers << llendl ;
	LL_INFOS("Window") << "pfd.iLayerType:       " << (int)pfd.iLayerType << llendl ;
	LL_INFOS("Window") << "pfd.bReserved:        " << (int)pfd.bReserved << llendl ;
	LL_INFOS("Window") << "pfd.dwLayerMask:      " << pfd.dwLayerMask << llendl ;
	LL_INFOS("Window") << "pfd.dwVisibleMask:    " << pfd.dwVisibleMask << llendl ;
	LL_INFOS("Window") << "pfd.dwDamageMask:     " << pfd.dwDamageMask << llendl ;
	LL_INFOS("Window") << "--- end pixel format dump ---" << llendl ;

	if (pfd.cColorBits < 32)
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBTrueColorWindow"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (pfd.cAlphaBits < 8)
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBAlpha"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (!SetPixelFormat(mhDC, pixel_format, &pfd))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBPixelFmtSetErr"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (!(mhRC = wglCreateContext(mhDC)))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBGLContextErr"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (!wglMakeCurrent(mhDC, mhRC))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBGLContextActErr"),
			mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	LL_INFOS("Window") << "Drawing context is created." << llendl ;

	gGLManager.initWGL();
	
	if (wglChoosePixelFormatARB)
	{
		// OK, at this point, use the ARB wglChoosePixelFormatsARB function to see if we
		// can get exactly what we want.
		GLint attrib_list[256];
		S32 cur_attrib = 0;

		attrib_list[cur_attrib++] = WGL_DEPTH_BITS_ARB;
		attrib_list[cur_attrib++] = 24;

		attrib_list[cur_attrib++] = WGL_STENCIL_BITS_ARB;
		attrib_list[cur_attrib++] = 8;

		attrib_list[cur_attrib++] = WGL_DRAW_TO_WINDOW_ARB;
		attrib_list[cur_attrib++] = GL_TRUE;

		attrib_list[cur_attrib++] = WGL_ACCELERATION_ARB;
		attrib_list[cur_attrib++] = WGL_FULL_ACCELERATION_ARB;

		attrib_list[cur_attrib++] = WGL_SUPPORT_OPENGL_ARB;
		attrib_list[cur_attrib++] = GL_TRUE;

		attrib_list[cur_attrib++] = WGL_DOUBLE_BUFFER_ARB;
		attrib_list[cur_attrib++] = GL_TRUE;

		attrib_list[cur_attrib++] = WGL_COLOR_BITS_ARB;
		attrib_list[cur_attrib++] = 24;

		attrib_list[cur_attrib++] = WGL_ALPHA_BITS_ARB;
		attrib_list[cur_attrib++] = 8;

		U32 end_attrib = 0;
		if (mFSAASamples > 0)
		{
			end_attrib = cur_attrib;
			attrib_list[cur_attrib++] = WGL_SAMPLE_BUFFERS_ARB;
			attrib_list[cur_attrib++] = GL_TRUE;

			attrib_list[cur_attrib++] = WGL_SAMPLES_ARB;
			attrib_list[cur_attrib++] = mFSAASamples;
		}

		// End the list
		attrib_list[cur_attrib++] = 0;

		GLint pixel_formats[256];
		U32 num_formats = 0;

		// First we try and get a 32 bit depth pixel format
		BOOL result = wglChoosePixelFormatARB(mhDC, attrib_list, NULL, 256, pixel_formats, &num_formats);
		
		while(!result && mFSAASamples > 0) 
		{
			llwarns << "FSAASamples: " << mFSAASamples << " not supported." << llendl ;

			mFSAASamples /= 2 ; //try to decrease sample pixel number until to disable anti-aliasing
			if(mFSAASamples < 2)
			{
				mFSAASamples = 0 ;
			}

			if (mFSAASamples > 0)
			{
				attrib_list[end_attrib + 3] = mFSAASamples;
			}
			else
			{
				cur_attrib = end_attrib ;
				end_attrib = 0 ;
				attrib_list[cur_attrib++] = 0 ; //end
			}
			result = wglChoosePixelFormatARB(mhDC, attrib_list, NULL, 256, pixel_formats, &num_formats);

			if(result)
			{
				llwarns << "Only support FSAASamples: " << mFSAASamples << llendl ;
			}
		}

		if (!result)
		{
			llwarns << "mFSAASamples: " << mFSAASamples << llendl ;

			close();
			show_window_creation_error("Error after wglChoosePixelFormatARB 32-bit");
			return FALSE;
		}

		if (!num_formats)
		{
			if (end_attrib > 0)
			{
				LL_INFOS("Window") << "No valid pixel format for " << mFSAASamples << "x anti-aliasing." << LL_ENDL;
				attrib_list[end_attrib] = 0;

				BOOL result = wglChoosePixelFormatARB(mhDC, attrib_list, NULL, 256, pixel_formats, &num_formats);
				if (!result)
				{
					close();
					show_window_creation_error("Error after wglChoosePixelFormatARB 32-bit no AA");
					return FALSE;
				}
			}

			if (!num_formats)
			{
				LL_INFOS("Window") << "No 32 bit z-buffer, trying 24 bits instead" << LL_ENDL;
				// Try 24-bit format
				attrib_list[1] = 24;
				BOOL result = wglChoosePixelFormatARB(mhDC, attrib_list, NULL, 256, pixel_formats, &num_formats);
				if (!result)
				{
					close();
					show_window_creation_error("Error after wglChoosePixelFormatARB 24-bit");
					return FALSE;
				}

				if (!num_formats)
				{
					LL_WARNS("Window") << "Couldn't get 24 bit z-buffer,trying 16 bits instead!" << LL_ENDL;
					attrib_list[1] = 16;
					BOOL result = wglChoosePixelFormatARB(mhDC, attrib_list, NULL, 256, pixel_formats, &num_formats);
					if (!result || !num_formats)
					{
						close();
						show_window_creation_error("Error after wglChoosePixelFormatARB 16-bit");
						return FALSE;
					}
				}
			}

			LL_INFOS("Window") << "Choosing pixel formats: " << num_formats << " pixel formats returned" << LL_ENDL;
		}

		LL_INFOS("Window") << "pixel formats done." << llendl ;

		S32 swap_method = 0;
		S32 cur_format = num_formats-1;
		GLint swap_query = WGL_SWAP_METHOD_ARB;

		BOOL found_format = FALSE;

		while (!found_format && wglGetPixelFormatAttribivARB(mhDC, pixel_format, 0, 1, &swap_query, &swap_method))
		{
			if (swap_method == WGL_SWAP_UNDEFINED_ARB || cur_format <= 0)
			{
				found_format = TRUE;
			}
			else
			{
				--cur_format;
			}
		}
		
		pixel_format = pixel_formats[cur_format];
		
		if (mhDC != 0)											// Does The Window Have A Device Context?
		{
			wglMakeCurrent(mhDC, 0);							// Set The Current Active Rendering Context To Zero
			if (mhRC != 0)										// Does The Window Have A Rendering Context?
			{
				wglDeleteContext (mhRC);							// Release The Rendering Context
				mhRC = 0;										// Zero The Rendering Context

			}
			ReleaseDC (mWindowHandle, mhDC);						// Release The Device Context
			mhDC = 0;											// Zero The Device Context
		}
		DestroyWindow (mWindowHandle);									// Destroy The Window
		

		mWindowHandle = CreateWindowEx(dw_ex_style,
			mWindowClassName,
			mWindowTitle,
			WS_CLIPSIBLINGS | WS_CLIPCHILDREN | dw_style,
			window_rect.left,								// x pos
			window_rect.top,								// y pos
			window_rect.right - window_rect.left,			// width
			window_rect.bottom - window_rect.top,			// height
			NULL,
			NULL,
			mhInstance,
			NULL);

		LL_INFOS("Window") << "recreate window done." << llendl ;

		if (!(mhDC = GetDC(mWindowHandle)))
		{
			close();
			OSMessageBox(mCallbacks->translateString("MBDevContextErr"), mCallbacks->translateString("MBError"), OSMB_OK);
			return FALSE;
		}

		if (!SetPixelFormat(mhDC, pixel_format, &pfd))
		{
			close();
			OSMessageBox(mCallbacks->translateString("MBPixelFmtSetErr"),
				mCallbacks->translateString("MBError"), OSMB_OK);
			return FALSE;
		}

		if (wglGetPixelFormatAttribivARB(mhDC, pixel_format, 0, 1, &swap_query, &swap_method))
		{
			switch (swap_method)
			{
			case WGL_SWAP_EXCHANGE_ARB:
				mSwapMethod = SWAP_METHOD_EXCHANGE;
				LL_DEBUGS("Window") << "Swap Method: Exchange" << LL_ENDL;
				break;
			case WGL_SWAP_COPY_ARB:
				mSwapMethod = SWAP_METHOD_COPY;
				LL_DEBUGS("Window") << "Swap Method: Copy" << LL_ENDL;
				break;
			case WGL_SWAP_UNDEFINED_ARB:
				mSwapMethod = SWAP_METHOD_UNDEFINED;
				LL_DEBUGS("Window") << "Swap Method: Undefined" << LL_ENDL;
				break;
			default:
				mSwapMethod = SWAP_METHOD_UNDEFINED;
				LL_DEBUGS("Window") << "Swap Method: Unknown" << LL_ENDL;
				break;
			}
		}		
	}
	else
	{
		LL_WARNS("Window") << "No wgl_ARB_pixel_format extension, using default ChoosePixelFormat!" << LL_ENDL;
	}

	// Verify what pixel format we actually received.
	if (!DescribePixelFormat(mhDC, pixel_format, sizeof(PIXELFORMATDESCRIPTOR),
		&pfd))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBPixelFmtDescErr"), mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	LL_INFOS("Window") << "GL buffer: Color Bits " << S32(pfd.cColorBits) 
		<< " Alpha Bits " << S32(pfd.cAlphaBits)
		<< " Depth Bits " << S32(pfd.cDepthBits) 
		<< LL_ENDL;

	// make sure we have 32 bits per pixel
	if (pfd.cColorBits < 32 || GetDeviceCaps(mhDC, BITSPIXEL) < 32)
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBTrueColorWindow"), mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (pfd.cAlphaBits < 8)
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBAlpha"), mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	mhRC = 0;
	if (wglCreateContextAttribsARB)
	{ //attempt to create a specific versioned context
		S32 attribs[] = 
		{ //start at 4.2
			WGL_CONTEXT_MAJOR_VERSION_ARB, 4,
			WGL_CONTEXT_MINOR_VERSION_ARB, 2,
			WGL_CONTEXT_PROFILE_MASK_ARB,  LLRender::sGLCoreProfile ? WGL_CONTEXT_CORE_PROFILE_BIT_ARB : WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
			WGL_CONTEXT_FLAGS_ARB, gDebugGL ? WGL_CONTEXT_DEBUG_BIT_ARB : 0,
			0
		};

		bool done = false;
		while (!done)
		{
			mhRC = wglCreateContextAttribsARB(mhDC, mhRC, attribs);

			if (!mhRC)
			{
				if (attribs[3] > 0)
				{ //decrement minor version
					attribs[3]--;
				}
				else if (attribs[1] > 3)
				{ //decrement major version and start minor version over at 3
					attribs[1]--;
					attribs[3] = 3;
				}
				else
				{ //we reached 3.0 and still failed, bail out
					done = true;
				}
			}
			else
			{
				llinfos << "Created OpenGL " << llformat("%d.%d", attribs[1], attribs[3]) << " context." << llendl;
				done = true;

				if (LLRender::sGLCoreProfile)
				{
					LLGLSLShader::sNoFixedFunction = true;
				}
			}
		}
	}

	if (!mhRC && !(mhRC = wglCreateContext(mhDC)))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBGLContextErr"), mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (!wglMakeCurrent(mhDC, mhRC))
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBGLContextActErr"), mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}

	if (!gGLManager.initGL())
	{
		close();
		OSMessageBox(mCallbacks->translateString("MBVideoDrvErr"), mCallbacks->translateString("MBError"), OSMB_OK);
		return FALSE;
	}
	
	// Disable vertical sync for swap
	if (disable_vsync && wglSwapIntervalEXT)
	{
		LL_DEBUGS("Window") << "Disabling vertical sync" << LL_ENDL;
		wglSwapIntervalEXT(0);
	}
	else
	{
		LL_DEBUGS("Window") << "Keeping vertical sync" << LL_ENDL;
	}

	SetWindowLong(mWindowHandle, GWL_USERDATA, (U32)this);

	// register this window as handling drag/drop events from the OS
	DragAcceptFiles( mWindowHandle, TRUE );

	mDragDrop->init( mWindowHandle );
	
	//register joystick timer callback
	SetTimer( mWindowHandle, 0, 1000 / 30, NULL ); // 30 fps timer

	// ok to post quit messages now
	mPostQuit = TRUE;

	if (auto_show)
	{
		show();
		glClearColor(0.0f, 0.0f, 0.0f, 0.f);
		glClear(GL_COLOR_BUFFER_BIT);
		swapBuffers();
	}

	return TRUE;
}

void LLWindowWin32::moveWindow( const LLCoordScreen& position, const LLCoordScreen& size )
{
	if( mIsMouseClipping )
	{
		RECT client_rect_in_screen_space;
		if( getClientRectInScreenSpace( &client_rect_in_screen_space ) )
		{
			ClipCursor( &client_rect_in_screen_space );
		}
	}

	// if the window was already maximized, MoveWindow seems to still set the maximized flag even if
	// the window is smaller than maximized.
	// So we're going to do a restore first (which is a ShowWindow call) (SL-44655).

	// THIS CAUSES DEV-15484 and DEV-15949 
	//ShowWindow(mWindowHandle, SW_RESTORE);
	// NOW we can call MoveWindow
	MoveWindow(mWindowHandle, position.mX, position.mY, size.mX, size.mY, TRUE);
}

BOOL LLWindowWin32::setCursorPosition(const LLCoordWindow position)
{
	LLCoordScreen screen_pos;

	mMousePositionModified = TRUE;
	if (!mWindowHandle)
	{
		return FALSE;
	}

	if (!convertCoords(position, &screen_pos))
	{
		return FALSE;
	}

	// Inform the application of the new mouse position (needed for per-frame
	// hover/picking to function).
	LLCoordGL gl_pos;
	convertCoords(position, &gl_pos);
	mCallbacks->handleMouseMove(this, gl_pos, (MASK)0);
	
	// DEV-18951 VWR-8524 Camera moves wildly when alt-clicking.
	// Because we have preemptively notified the application of the new
	// mouse position via handleMouseMove() above, we need to clear out
	// any stale mouse move events.  RN/JC
	MSG msg;
	while (PeekMessage(&msg, NULL, WM_MOUSEMOVE, WM_MOUSEMOVE, PM_REMOVE))
	{ }

	return SetCursorPos(screen_pos.mX, screen_pos.mY);
}

BOOL LLWindowWin32::getCursorPosition(LLCoordWindow *position)
{
	POINT cursor_point;
	LLCoordScreen screen_pos;

	if (!mWindowHandle ||
		!GetCursorPos(&cursor_point))
	{
		return FALSE;
	}

	screen_pos.mX = cursor_point.x;
	screen_pos.mY = cursor_point.y;

	return convertCoords(screen_pos, position);
}

void LLWindowWin32::hideCursor()
{
	while (ShowCursor(FALSE) >= 0)
	{
		// nothing, wait for cursor to push down
	}
	mCursorHidden = TRUE;
	mHideCursorPermanent = TRUE;
}

void LLWindowWin32::showCursor()
{
	// makes sure the cursor shows up
	while (ShowCursor(TRUE) < 0)
	{
		// do nothing, wait for cursor to pop out
	}
	mCursorHidden = FALSE;
	mHideCursorPermanent = FALSE;
}

void LLWindowWin32::showCursorFromMouseMove()
{
	if (!mHideCursorPermanent)
	{
		showCursor();
	}
}

void LLWindowWin32::hideCursorUntilMouseMove()
{
	if (!mHideCursorPermanent)
	{
		hideCursor();
		mHideCursorPermanent = FALSE;
	}
}

BOOL LLWindowWin32::isCursorHidden()
{
	return mCursorHidden;
}


HCURSOR LLWindowWin32::loadColorCursor(LPCTSTR name)
{
	return (HCURSOR)LoadImage(mhInstance,
							  name,
							  IMAGE_CURSOR,
							  0,	// default width
							  0,	// default height
							  LR_DEFAULTCOLOR);
}


void LLWindowWin32::initCursors()
{
	mCursor[ UI_CURSOR_ARROW ]		= LoadCursor(NULL, IDC_ARROW);
	mCursor[ UI_CURSOR_WAIT ]		= LoadCursor(NULL, IDC_WAIT);
	mCursor[ UI_CURSOR_HAND ]		= LoadCursor(NULL, IDC_HAND);
	mCursor[ UI_CURSOR_IBEAM ]		= LoadCursor(NULL, IDC_IBEAM);
	mCursor[ UI_CURSOR_CROSS ]		= LoadCursor(NULL, IDC_CROSS);
	mCursor[ UI_CURSOR_SIZENWSE ]	= LoadCursor(NULL, IDC_SIZENWSE);
	mCursor[ UI_CURSOR_SIZENESW ]	= LoadCursor(NULL, IDC_SIZENESW);
	mCursor[ UI_CURSOR_SIZEWE ]		= LoadCursor(NULL, IDC_SIZEWE);  
	mCursor[ UI_CURSOR_SIZENS ]		= LoadCursor(NULL, IDC_SIZENS);  
	mCursor[ UI_CURSOR_NO ]			= LoadCursor(NULL, IDC_NO);
	mCursor[ UI_CURSOR_WORKING ]	= LoadCursor(NULL, IDC_APPSTARTING); 

	HMODULE module = GetModuleHandle(NULL);
	mCursor[ UI_CURSOR_TOOLGRAB ]	= LoadCursor(module, TEXT("TOOLGRAB"));
	mCursor[ UI_CURSOR_TOOLLAND ]	= LoadCursor(module, TEXT("TOOLLAND"));
	mCursor[ UI_CURSOR_TOOLFOCUS ]	= LoadCursor(module, TEXT("TOOLFOCUS"));
	mCursor[ UI_CURSOR_TOOLCREATE ]	= LoadCursor(module, TEXT("TOOLCREATE"));
	mCursor[ UI_CURSOR_ARROWDRAG ]	= LoadCursor(module, TEXT("ARROWDRAG"));
	mCursor[ UI_CURSOR_ARROWCOPY ]	= LoadCursor(module, TEXT("ARROWCOPY"));
	mCursor[ UI_CURSOR_ARROWDRAGMULTI ]	= LoadCursor(module, TEXT("ARROWDRAGMULTI"));
	mCursor[ UI_CURSOR_ARROWCOPYMULTI ]	= LoadCursor(module, TEXT("ARROWCOPYMULTI"));
	mCursor[ UI_CURSOR_NOLOCKED ]	= LoadCursor(module, TEXT("NOLOCKED"));
	mCursor[ UI_CURSOR_ARROWLOCKED ]= LoadCursor(module, TEXT("ARROWLOCKED"));
	mCursor[ UI_CURSOR_GRABLOCKED ]	= LoadCursor(module, TEXT("GRABLOCKED"));
	mCursor[ UI_CURSOR_TOOLTRANSLATE ]	= LoadCursor(module, TEXT("TOOLTRANSLATE"));
	mCursor[ UI_CURSOR_TOOLROTATE ]	= LoadCursor(module, TEXT("TOOLROTATE")); 
	mCursor[ UI_CURSOR_TOOLSCALE ]	= LoadCursor(module, TEXT("TOOLSCALE"));
	mCursor[ UI_CURSOR_TOOLCAMERA ]	= LoadCursor(module, TEXT("TOOLCAMERA"));
	mCursor[ UI_CURSOR_TOOLPAN ]	= LoadCursor(module, TEXT("TOOLPAN"));
	mCursor[ UI_CURSOR_TOOLZOOMIN ] = LoadCursor(module, TEXT("TOOLZOOMIN"));
	mCursor[ UI_CURSOR_TOOLPICKOBJECT3 ] = LoadCursor(module, TEXT("TOOLPICKOBJECT3"));
	mCursor[ UI_CURSOR_PIPETTE ] = LoadCursor(module, TEXT("TOOLPIPETTE"));
	mCursor[ UI_CURSOR_TOOLSIT ]	= LoadCursor(module, TEXT("TOOLSIT"));
	mCursor[ UI_CURSOR_TOOLBUY ]	= LoadCursor(module, TEXT("TOOLBUY"));
	mCursor[ UI_CURSOR_TOOLOPEN ]	= LoadCursor(module, TEXT("TOOLOPEN"));

	// Color cursors
	mCursor[ UI_CURSOR_TOOLPLAY ]		= loadColorCursor(TEXT("TOOLPLAY"));
	mCursor[ UI_CURSOR_TOOLPAUSE ]		= loadColorCursor(TEXT("TOOLPAUSE"));
	mCursor[ UI_CURSOR_TOOLMEDIAOPEN ]	= loadColorCursor(TEXT("TOOLMEDIAOPEN"));

	// Note: custom cursors that are not found make LoadCursor() return NULL.
	for( S32 i = 0; i < UI_CURSOR_COUNT; i++ )
	{
		if( !mCursor[i] )
		{
			mCursor[i] = LoadCursor(NULL, IDC_ARROW);
		}
	}
}



void LLWindowWin32::updateCursor()
{
	if (mNextCursor == UI_CURSOR_ARROW
		&& mBusyCount > 0)
	{
		mNextCursor = UI_CURSOR_WORKING;
	}

	if( mCurrentCursor != mNextCursor )
	{
		mCurrentCursor = mNextCursor;
		SetCursor( mCursor[mNextCursor] );
	}
}

ECursorType LLWindowWin32::getCursor() const
{
	return mCurrentCursor;
}

void LLWindowWin32::captureMouse()
{
	SetCapture(mWindowHandle);
}

void LLWindowWin32::releaseMouse()
{
	// *NOTE:Mani ReleaseCapture will spawn new windows messages...
	// which will in turn call our MainWindowProc. It therefore requires
	// pausing *and more importantly resumption* of the mainlooptimeout...
	// just like DispatchMessage below.
	mCallbacks->handlePauseWatchdog(this);
	ReleaseCapture();
	mCallbacks->handleResumeWatchdog(this);
}


void LLWindowWin32::delayInputProcessing()
{
	mInputProcessingPaused = TRUE;
}

void LLWindowWin32::gatherInput()
{
	MSG		msg;
	int		msg_count = 0;

	LLMemType m1(LLMemType::MTYPE_GATHER_INPUT);

	while ((msg_count < MAX_MESSAGE_PER_UPDATE) && PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
	{
		mCallbacks->handlePingWatchdog(this, "Main:TranslateGatherInput");
		TranslateMessage(&msg);

		// turn watchdog off in…