snes9x/win32/win32_display.cpp

/***********************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.

  (c) Copyright 1996 - 2002  Gary Henderson (gary.henderson@ntlworld.com),
                             Jerremy Koot (jkoot@snes9x.com)

  (c) Copyright 2002 - 2004  Matthew Kendora

  (c) Copyright 2002 - 2005  Peter Bortas (peter@bortas.org)

  (c) Copyright 2004 - 2005  Joel Yliluoma (http://iki.fi/bisqwit/)

  (c) Copyright 2001 - 2006  John Weidman (jweidman@slip.net)

  (c) Copyright 2002 - 2006  funkyass (funkyass@spam.shaw.ca),
                             Kris Bleakley (codeviolation@hotmail.com)

  (c) Copyright 2002 - 2010  Brad Jorsch (anomie@users.sourceforge.net),
                             Nach (n-a-c-h@users.sourceforge.net),

  (c) Copyright 2002 - 2011  zones (kasumitokoduck@yahoo.com)

  (c) Copyright 2006 - 2007  nitsuja

  (c) Copyright 2009 - 2018  BearOso,
                             OV2

  (c) Copyright 2017         qwertymodo

  (c) Copyright 2011 - 2017  Hans-Kristian Arntzen,
                             Daniel De Matteis
                             (Under no circumstances will commercial rights be given)


  BS-X C emulator code
  (c) Copyright 2005 - 2006  Dreamer Nom,
                             zones

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003  _Demo_ (_demo_@zsnes.com),
                             Nach,
                             zsKnight (zsknight@zsnes.com)

  C4 C++ code
  (c) Copyright 2003 - 2006  Brad Jorsch,
                             Nach

  DSP-1 emulator code
  (c) Copyright 1998 - 2006  _Demo_,
                             Andreas Naive (andreasnaive@gmail.com),
                             Gary Henderson,
                             Ivar (ivar@snes9x.com),
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora,
                             Nach,
                             neviksti (neviksti@hotmail.com)

  DSP-2 emulator code
  (c) Copyright 2003         John Weidman,
                             Kris Bleakley,
                             Lord Nightmare (lord_nightmare@users.sourceforge.net),
                             Matthew Kendora,
                             neviksti

  DSP-3 emulator code
  (c) Copyright 2003 - 2006  John Weidman,
                             Kris Bleakley,
                             Lancer,
                             z80 gaiden

  DSP-4 emulator code
  (c) Copyright 2004 - 2006  Dreamer Nom,
                             John Weidman,
                             Kris Bleakley,
                             Nach,
                             z80 gaiden

  OBC1 emulator code
  (c) Copyright 2001 - 2004  zsKnight,
                             pagefault (pagefault@zsnes.com),
                             Kris Bleakley
                             Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code used in 1.39-1.51
  (c) Copyright 2002         Matthew Kendora with research by
                             zsKnight,
                             John Weidman,
                             Dark Force

  SPC7110 and RTC C++ emulator code used in 1.52+
  (c) Copyright 2009         byuu,
                             neviksti

  S-DD1 C emulator code
  (c) Copyright 2003         Brad Jorsch with research by
                             Andreas Naive,
                             John Weidman

  S-RTC C emulator code
  (c) Copyright 2001 - 2006  byuu,
                             John Weidman

  ST010 C++ emulator code
  (c) Copyright 2003         Feather,
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora

  Super FX x86 assembler emulator code
  (c) Copyright 1998 - 2003  _Demo_,
                             pagefault,
                             zsKnight

  Super FX C emulator code
  (c) Copyright 1997 - 1999  Ivar,
                             Gary Henderson,
                             John Weidman

  Sound emulator code used in 1.5-1.51
  (c) Copyright 1998 - 2003  Brad Martin
  (c) Copyright 1998 - 2006  Charles Bilyue'

  Sound emulator code used in 1.52+
  (c) Copyright 2004 - 2007  Shay Green (gblargg@gmail.com)

  S-SMP emulator code used in 1.54+
  (c) Copyright 2016         byuu

  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004  Marcus Comstedt (marcus@mc.pp.se)

  2xSaI filter
  (c) Copyright 1999 - 2001  Derek Liauw Kie Fa

  HQ2x, HQ3x, HQ4x filters
  (c) Copyright 2003         Maxim Stepin (maxim@hiend3d.com)

  NTSC filter
  (c) Copyright 2006 - 2007  Shay Green

  GTK+ GUI code
  (c) Copyright 2004 - 2018  BearOso

  Win32 GUI code
  (c) Copyright 2003 - 2006  blip,
                             funkyass,
                             Matthew Kendora,
                             Nach,
                             nitsuja
  (c) Copyright 2009 - 2018  OV2

  Mac OS GUI code
  (c) Copyright 1998 - 2001  John Stiles
  (c) Copyright 2001 - 2011  zones

  Libretro port
  (c) Copyright 2011 - 2017  Hans-Kristian Arntzen,
                             Daniel De Matteis
                             (Under no circumstances will commercial rights be given)


  Specific ports contains the works of other authors. See headers in
  individual files.


  Snes9x homepage: http://www.snes9x.com/

  Permission to use, copy, modify and/or distribute Snes9x in both binary
  and source form, for non-commercial purposes, is hereby granted without
  fee, providing that this license information and copyright notice appear
  with all copies and any derived work.

  This software is provided 'as-is', without any express or implied
  warranty. In no event shall the authors be held liable for any damages
  arising from the use of this software or it's derivatives.

  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes,
  but is not limited to, charging money for Snes9x or software derived from
  Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
  using Snes9x as a promotion for your commercial product.

  The copyright holders request that bug fixes and improvements to the code
  should be forwarded to them so everyone can benefit from the modifications
  in future versions.

  Super NES and Super Nintendo Entertainment System are trademarks of
  Nintendo Co., Limited and its subsidiary companies.
 ***********************************************************************************/

/* win32_display.cpp
	Contains most of the display related functions of the win32 port.
	Delegates relevant function calls to the currently selected IS9xDisplayOutput object.
*/

#include "../snes9x.h"
#include "../ppu.h"
#include "../font.h"
#include "wsnes9x.h"
#include "win32_display.h"
#include "CDirect3D.h"
#if DIRECTDRAW_SUPPORT
#include "CDirectDraw.h"
#endif
#include "COpenGL.h"
#include "IS9xDisplayOutput.h"

#include "../filter/hq2x.h"
#include "../filter/2xsai.h"
#include "../apu/apu.h"

// available display output methods
CDirect3D Direct3D;
#if DIRECTDRAW_SUPPORT
CDirectDraw DirectDraw;
#endif
COpenGL OpenGL;
SSurface Src = {0};
extern BYTE *ScreenBufferBlend;

// Interface used to access the display output
IS9xDisplayOutput *S9xDisplayOutput=&Direct3D;

#ifndef max
#define max(a,b)            (((a) > (b)) ? (a) : (b))
#endif
#ifndef min
#define min(a,b)            (((a) < (b)) ? (a) : (b))
#endif

bool8 S9xDeinitUpdate (int, int);
void DoAVIVideoFrame();

/*  WinRefreshDisplay
repeats the last rendered frame
*/
void WinRefreshDisplay(void)
{
	if(!Src.Width)
		return;

	SelectRenderMethod ();

	S9xDisplayOutput->Render(Src);
	GUI.FlipCounter++;
}

void WinChangeWindowSize(unsigned int newWidth, unsigned int newHeight)
{
	S9xDisplayOutput->ChangeRenderSize(newWidth,newHeight);
}

/*  WinDisplayReset
initializes the currently selected display output and
reinitializes the core graphics rendering
-----
returns true if successful, false otherwise
*/
bool WinDisplayReset(void)
{
	S9xDisplayOutput->DeInitialize();
	switch(GUI.outputMethod) {
		default:
		case DIRECT3D:
			S9xDisplayOutput = &Direct3D;
			break;
#if DIRECTDRAW_SUPPORT
		case DIRECTDRAW:
			S9xDisplayOutput = &DirectDraw;
			break;
#endif
		case OPENGL:
			S9xDisplayOutput = &OpenGL;
			break;
	}
	if(S9xDisplayOutput->Initialize(GUI.hWnd)) {
		S9xGraphicsDeinit();
		S9xSetWinPixelFormat ();
		S9xGraphicsInit();
		return true;
	} else {
		MessageBox (GUI.hWnd, Languages[ GUI.Language].errInitDD, TEXT("Snes9X - Display Failure"), MB_OK | MB_ICONSTOP);
		return false;
	}
}

void WinDisplayApplyChanges()
{
	S9xDisplayOutput->ApplyDisplayChanges();
}

RECT CalculateDisplayRect(unsigned int sourceWidth,unsigned int sourceHeight,
						  unsigned int displayWidth,unsigned int displayHeight)
{
	double xFactor;
	double yFactor;
	double minFactor;
	double renderWidthCalc,renderHeightCalc;
	int hExtend = GUI.HeightExtend ? SNES_HEIGHT_EXTENDED : SNES_HEIGHT;
	double snesAspect = (double)GUI.AspectWidth/hExtend;
	RECT drawRect;

	if(GUI.Stretch) {
		if(GUI.AspectRatio) {

			if (GUI.IntegerScaling && sourceHeight > 0 && sourceHeight <= displayHeight && (int)(sourceHeight * snesAspect) <= displayWidth) {
				int h;
				for (h = sourceHeight * 2; h <= displayHeight && (int)(h * snesAspect) <= displayWidth; h += sourceHeight) {}
				h -= sourceHeight;
				drawRect.right = (LONG)(h * snesAspect);
				drawRect.bottom = h;
			} else {
				//fix for hi-res images with FILTER_NONE
				//where we need to correct the aspect ratio
				renderWidthCalc = (double)sourceWidth;
				renderHeightCalc = (double)sourceHeight;
				if (renderWidthCalc / renderHeightCalc > snesAspect)
					renderWidthCalc = renderHeightCalc * snesAspect;
				else if (renderWidthCalc / renderHeightCalc < snesAspect)
					renderHeightCalc = renderWidthCalc / snesAspect;

				xFactor = (double)displayWidth / renderWidthCalc;
				yFactor = (double)displayHeight / renderHeightCalc;
				minFactor = xFactor < yFactor ? xFactor : yFactor;

				drawRect.right = (LONG)(renderWidthCalc * minFactor);
				drawRect.bottom = (LONG)(renderHeightCalc * minFactor);
			}

			drawRect.left = (displayWidth - drawRect.right) / 2;
			drawRect.top = (displayHeight - drawRect.bottom) / 2;
			drawRect.right += drawRect.left;
			drawRect.bottom += drawRect.top;

		} else {
			drawRect.top = 0;
			drawRect.left = 0;
			drawRect.right = displayWidth;
			drawRect.bottom = displayHeight;
		}
	} else {
		drawRect.left = ((int)(displayWidth) - (int)sourceWidth) / 2;
		drawRect.top = ((int)(displayHeight) - (int)sourceHeight) / 2;
		if(!GUI.AlwaysCenterImage) {
			if(drawRect.left < 0) drawRect.left = 0;
			if(drawRect.top < 0) drawRect.top = 0;
		}
		drawRect.right = drawRect.left + sourceWidth;
		drawRect.bottom = drawRect.top + sourceHeight;
	}
	return drawRect;
}

// we no longer support 8bit modes - no palette necessary
void S9xSetPalette( void)
{
	return;	
}

bool8 S9xInitUpdate (void)
{
	return (TRUE);
}

// only necessary for avi recording
// TODO: check if this can be removed
bool8 S9xContinueUpdate(int Width, int Height)
{
	// called every other frame during interlace
	
    Src.Width = Width;
	if(Height%SNES_HEIGHT)
	    Src.Height = Height;
	else
	{
		if(Height==SNES_HEIGHT)
			Src.Height=SNES_HEIGHT_EXTENDED;
		else Src.Height=SNES_HEIGHT_EXTENDED<<1;
	}
    Src.Pitch = GFX.Pitch;
    Src.Surface = (BYTE*)GFX.Screen;

	// avi writing
	DoAVIVideoFrame();

	return true;
}

// do the actual rendering of a frame
bool8 S9xDeinitUpdate (int Width, int Height)
{
    Src.Width = Width;
	if(Height%SNES_HEIGHT)
	    Src.Height = Height;
	else
	{
		if(Height==SNES_HEIGHT)
			Src.Height=SNES_HEIGHT_EXTENDED;
		else Src.Height=SNES_HEIGHT_EXTENDED<<1;
	}
    Src.Pitch = GFX.Pitch;
    Src.Surface = (BYTE*)GFX.Screen;

	// avi writing
	DoAVIVideoFrame();

	// Clear some of the old SNES rendered image
	// when the resolution becomes lower in x or y,
	// otherwise the image processors (filters) might access
	// some of the old rendered data at the edges.
    {
        static int LastWidth = 0;
        static int LastHeight = 0;

        if (Width < LastWidth)
        {
            const int hh = max(LastHeight, Height);
            for (int i = 0; i < hh; i++)
                memset (GFX.Screen + i * (GFX.Pitch>>1) + Width*1, 0, 4);
        }
        if (Height < LastHeight)
		{
            const int ww = max(LastWidth, Width);
            for (int i = Height; i < LastHeight ; i++)
                memset (GFX.Screen + i * (GFX.Pitch>>1), 0, ww * 2);

			// also old clear extended height stuff from drawing surface
			if((int)Src.Height > Height)
				for (int i = Height; i < (int)Src.Height ; i++)
					memset (Src.Surface + i * Src.Pitch, 0, Src.Pitch);
		}
        LastWidth = Width;
        LastHeight = Height;
    }
	
	WinRefreshDisplay();

    return (true);
}

/*  S9xSetWinPixelFormat
sets default settings and calls the appropriate display object
*/
void S9xSetWinPixelFormat ()
{
    S9xSetRenderPixelFormat (RGB565);
    GUI.NeedDepthConvert = FALSE;
	GUI.DepthConverted = !GUI.NeedDepthConvert;

	S9xBlit2xSaIFilterDeinit();
	S9xBlitHQ2xFilterDeinit();

	S9xDisplayOutput->SetSnes9xColorFormat();
}

char *ReadShaderFileContents(const TCHAR *filename)
{
	HANDLE hFile;
	DWORD size;
	DWORD bytesRead;
	char *contents;

	hFile = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL,
				OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN , 0);
	if(hFile == INVALID_HANDLE_VALUE){
		return NULL;
	}
	size = GetFileSize(hFile,NULL);
	contents = new char[size+1];
	if(!ReadFile(hFile,contents,size,&bytesRead,NULL)) {
		CloseHandle(hFile);
		delete[] contents;
		return NULL;
	}
	CloseHandle(hFile);
	contents[size] = '\0';
	return contents;

}

void ReduceToPath(TCHAR *filename)
{
    for (int i = lstrlen(filename); i >= 0; i--) {
        if (IS_SLASH(filename[i])) {
            filename[i] = TEXT('\0');
            break;
        }
    }
}

// TODO: abstract the following functions in some way - only necessary for directdraw

/* DirectDraw only begin */
void SwitchToGDI()
{
#if DIRECTDRAW_SUPPORT
	if(GUI.outputMethod!=DIRECTDRAW)
		return;

    IPPU.ColorsChanged = true;
    DirectDraw.lpDD->FlipToGDISurface();
    GUI.FlipCounter = 0;
    DirectDraw.lpDDSPrimary2->SetPalette (NULL);
#endif
}

static void ClearSurface (LPDIRECTDRAWSURFACE2 lpDDSurface)
{
#if DIRECTDRAW_SUPPORT
    DDBLTFX fx;

    memset (&fx, 0, sizeof (fx));
    fx.dwSize = sizeof (fx);

    while (lpDDSurface->Blt (NULL, DirectDraw.lpDDSPrimary2, NULL, DDBLT_WAIT, NULL) == DDERR_SURFACELOST)
        lpDDSurface->Restore ();
#endif
}

void UpdateBackBuffer()
{
#if DIRECTDRAW_SUPPORT
    if (GUI.outputMethod==DIRECTDRAW && GUI.FullScreen)
    {
        SwitchToGDI();

        DDBLTFX fx;

        memset (&fx, 0, sizeof (fx));
        fx.dwSize = sizeof (fx);

        while (DirectDraw.lpDDSPrimary2->Blt (NULL, NULL, NULL, DDBLT_WAIT | DDBLT_COLORFILL, &fx) == DDERR_SURFACELOST)
            DirectDraw.lpDDSPrimary2->Restore ();

        if (GetMenu (GUI.hWnd) != NULL)
            DrawMenuBar (GUI.hWnd);

        GUI.FlipCounter = 0;
        DDSCAPS caps;
        caps.dwCaps = DDSCAPS_BACKBUFFER;

        LPDIRECTDRAWSURFACE2 pDDSurface;

        if (DirectDraw.lpDDSPrimary2->GetAttachedSurface (&caps, &pDDSurface) == DD_OK &&
            pDDSurface != NULL)
        {
            ClearSurface (pDDSurface);
			DirectDraw.lpDDSPrimary2->Flip (NULL, GUI.Vsync?DDFLIP_WAIT:DDFLIP_NOVSYNC);
            while (DirectDraw.lpDDSPrimary2->GetFlipStatus (DDGFS_ISFLIPDONE) != DD_OK)
                Sleep (0);
			if(DirectDraw.doubleBuffered)
	            ClearSurface (pDDSurface);
        }
    }
    else
    {
        if (GetMenu( GUI.hWnd) != NULL)
            DrawMenuBar (GUI.hWnd);
    }
#endif
}

void RestoreGUIDisplay ()
{
#if DIRECTDRAW_SUPPORT
	if(GUI.outputMethod!=DIRECTDRAW)
		return;

    S9xSetPause (PAUSE_RESTORE_GUI);

    if (GUI.FullScreen &&
        (GUI.FullscreenMode.width < 640 || GUI.FullscreenMode.height < 400) &&
        !DirectDraw.SetDisplayMode (640, 480, 1, 0, 60, !GUI.FullScreen, false))
    {
        MessageBox (GUI.hWnd, Languages[ GUI.Language].errModeDD, TEXT("Snes9X - DirectDraw(1)"), MB_OK | MB_ICONSTOP);
        S9xClearPause (PAUSE_RESTORE_GUI);
        return;
    }
    SwitchToGDI();
    S9xClearPause (PAUSE_RESTORE_GUI);
#endif
}

void RestoreSNESDisplay ()
{
#if DIRECTDRAW_SUPPORT
	if(GUI.outputMethod!=DIRECTDRAW)
		return;

	if (!DirectDraw.SetFullscreen(GUI.FullScreen))
    {
        MessageBox (GUI.hWnd, Languages[ GUI.Language].errModeDD, TEXT("Snes9X - DirectDraw(4)"), MB_OK | MB_ICONSTOP);
        return;
    }

    UpdateBackBuffer();
#endif
}

/* DirectDraw only end */

void SaveMainWinPos()
{
	WINDOWPLACEMENT wndPlacement={0};
	wndPlacement.length = sizeof(WINDOWPLACEMENT);
	GetWindowPlacement(GUI.hWnd,&wndPlacement);
	GUI.window_maximized = wndPlacement.showCmd == SW_SHOWMAXIMIZED;
	if(!GUI.FullScreen && !GUI.EmulatedFullscreen)
		GUI.window_size = wndPlacement.rcNormalPosition;
}

void RestoreMainWinPos()
{
	WINDOWPLACEMENT wndPlacement={0};
	wndPlacement.length = sizeof(WINDOWPLACEMENT);
	wndPlacement.showCmd = GUI.window_maximized?SW_SHOWMAXIMIZED:SW_SHOWNORMAL;
	wndPlacement.rcNormalPosition = GUI.window_size;
	SetWindowPlacement(GUI.hWnd,&wndPlacement);
}

/*  ToggleFullScreen
switches between fullscreen and window mode and saves the window position
if EmulateFullscreen is set we simply create a borderless window that spans the screen
*/
void ToggleFullScreen ()
{
    S9xSetPause (PAUSE_TOGGLE_FULL_SCREEN);

    SaveMainWinPos();

	if(GUI.EmulateFullscreen) {
		HMONITOR hm;
		MONITORINFO mi;
		GUI.EmulatedFullscreen = !GUI.EmulatedFullscreen;
		if(GUI.EmulatedFullscreen) {
			if(GetMenu(GUI.hWnd)!=NULL)
				SetMenu(GUI.hWnd,NULL);
			SetWindowLongPtr (GUI.hWnd, GWL_STYLE, WS_POPUP|WS_VISIBLE);
			hm = MonitorFromWindow(GUI.hWnd,MONITOR_DEFAULTTONEAREST);
			mi.cbSize = sizeof(mi);
			GetMonitorInfo(hm,&mi);
			SetWindowPos (GUI.hWnd, HWND_TOP, mi.rcMonitor.left, mi.rcMonitor.top, mi.rcMonitor.right - mi.rcMonitor.left, mi.rcMonitor.bottom - mi.rcMonitor.top, SWP_DRAWFRAME|SWP_FRAMECHANGED);
		} else {
			SetWindowLongPtr( GUI.hWnd, GWL_STYLE, WS_POPUPWINDOW|WS_CAPTION|
                   WS_THICKFRAME|WS_VISIBLE|WS_MINIMIZEBOX|WS_MAXIMIZEBOX);
			SetMenu(GUI.hWnd,GUI.hMenu);
			SetWindowPos (GUI.hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE|SWP_DRAWFRAME|SWP_FRAMECHANGED);
			RestoreMainWinPos();
		}
	} else {
		GUI.FullScreen = !GUI.FullScreen;
		if(GUI.FullScreen) {
			if(GetMenu(GUI.hWnd)!=NULL)
				SetMenu(GUI.hWnd,NULL);
			SetWindowLongPtr (GUI.hWnd, GWL_STYLE, WS_POPUP|WS_VISIBLE);
			SetWindowPos (GUI.hWnd, HWND_TOPMOST, 0, 0, GUI.FullscreenMode.width, GUI.FullscreenMode.height, SWP_DRAWFRAME|SWP_FRAMECHANGED);
			if(!S9xDisplayOutput->SetFullscreen(true))
				GUI.FullScreen = false;
		}
		if(!GUI.FullScreen) {
			SetWindowLongPtr( GUI.hWnd, GWL_STYLE, WS_POPUPWINDOW|WS_CAPTION|
                   WS_THICKFRAME|WS_VISIBLE|WS_MINIMIZEBOX|WS_MAXIMIZEBOX);
			SetMenu(GUI.hWnd,GUI.hMenu);
			S9xDisplayOutput->SetFullscreen(false);
			SetWindowPos (GUI.hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE|SWP_DRAWFRAME|SWP_FRAMECHANGED);
			RestoreMainWinPos();
		}
		if (GUI.AutomaticInputRate)
		{
			int rate = WinGetAutomaticInputRate();
			if (rate)
			{
				Settings.SoundInputRate = rate;
				S9xUpdateDynamicRate(1, 2);
			}
		}
		S9xGraphicsDeinit();
		S9xSetWinPixelFormat ();
		S9xInitUpdate();
		S9xGraphicsInit();
	}
	IPPU.RenderThisFrame = true;

	S9xClearPause (PAUSE_TOGGLE_FULL_SCREEN);
}

/*  S9xOpenSoundDevice
ennumerates the available display modes of the currently selected output
*/
void WinEnumDisplayModes(std::vector<dMode> *modeVector)
{
	S9xDisplayOutput->EnumModes(modeVector);
}

double WinGetRefreshRate(void)
{
	typedef LONG(WINAPI *PGDCBS) (UINT32, UINT32 *, UINT32 *);
	typedef LONG(WINAPI *PQDC)   (UINT32, UINT32*, DISPLAYCONFIG_PATH_INFO *, UINT32*, DISPLAYCONFIG_MODE_INFO *, DISPLAYCONFIG_TOPOLOGY_ID *);
	static PGDCBS pGDCBS = NULL;
	static PQDC   pQDC   = NULL;
	static int firstrun = 1;

	if (firstrun)
	{
		HMODULE user32 = GetModuleHandleA("user32.dll");
		pQDC = (PQDC) GetProcAddress(user32, "QueryDisplayConfig");
		pGDCBS = (PGDCBS) GetProcAddress(user32, "GetDisplayConfigBufferSizes");
		firstrun = 0;
	}

	double refreshRate = 0.0;

	if (!pGDCBS || !pQDC)
		return refreshRate;

	OSVERSIONINFO ovi;
	DISPLAYCONFIG_TOPOLOGY_ID topologyID;
	unsigned int numPathArrayElements = 0;
	unsigned int numModeInfoArrayElements = 0;
	DISPLAYCONFIG_PATH_INFO * pathInfoArray = NULL;
	DISPLAYCONFIG_MODE_INFO * modeInfoArray = NULL;
	int result = 0;

	ovi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
	if (!GetVersionEx(&ovi))
		return refreshRate;

	if (ovi.dwMajorVersion < 6 || (ovi.dwMajorVersion == 6 && ovi.dwMinorVersion < 1))
		return refreshRate;

	result = pGDCBS(QDC_DATABASE_CURRENT,
		&numPathArrayElements,
		&numModeInfoArrayElements);

	if (result != ERROR_SUCCESS)
		return refreshRate;

	pathInfoArray = (DISPLAYCONFIG_PATH_INFO *)
		malloc(sizeof(DISPLAYCONFIG_PATH_INFO) * numPathArrayElements);
	modeInfoArray = (DISPLAYCONFIG_MODE_INFO *)
		malloc(sizeof(DISPLAYCONFIG_MODE_INFO) * numModeInfoArrayElements);

	result = pQDC(QDC_DATABASE_CURRENT,
		&numPathArrayElements,
		pathInfoArray,
		&numModeInfoArrayElements,
		modeInfoArray,
		&topologyID);

	if (result == ERROR_SUCCESS && numPathArrayElements >= 1)
	{
		refreshRate = (float)pathInfoArray[0].targetInfo.refreshRate.Numerator /
			pathInfoArray[0].targetInfo.refreshRate.Denominator;
	}

	free(modeInfoArray);
	free(pathInfoArray);

	return refreshRate;
}

int WinGetAutomaticInputRate(void)
{
    double refreshRate = WinGetRefreshRate();

    if (refreshRate == 0.0)
        return 0;

    // Try for a close multiple of 60hz
    if (refreshRate > 119.0 && refreshRate < 121.0)
        refreshRate /= 2.0;
    if (refreshRate > 179.0 && refreshRate < 181.0)
        refreshRate /= 3.0;
    if (refreshRate > 239.0 && refreshRate < 241.0)
        refreshRate /= 4.0;

    double newInputRate = refreshRate * 32040.0 / 60.09881389744051 + 0.5;

    if (newInputRate > 32040.0 * 1.05 || newInputRate < 32040.0 * 0.95)
        newInputRate = 0.0;

    return (int)newInputRate;
}

/* Depth conversion functions begin */

void Convert16To24 (SSurface *src, SSurface *dst, RECT *srect)
{
    const int height = srect->bottom - srect->top;
    const int width = srect->right - srect->left;
    const int offset1 = srect->top * src->Pitch + srect->left * 2;
    const int offset2 = ((dst->Height - height) >> 1) * dst->Pitch + ((dst->Width - width) >> 1) * 3;
	const int snesWidth = src->Width;
	const int snesHeight = src->Height;
	const bool doubledX = (snesWidth >= width*2) ? true : false;
	const bool doubledY = (snesHeight >= height*2) ? true : false;

    for (int y = 0; y < height; y++)
    {
		register uint16 *s = (uint16 *) ((uint8 *) src->Surface + (doubledY ? y*2 : y) * src->Pitch + offset1);
        register uint8 *d = ((uint8 *) dst->Surface + y * dst->Pitch + offset2);

		#define Interp(c1, c2) \
			(c1 == c2) ? c1 : \
			(((((c1 & 0x07E0)      + (c2 & 0x07E0)) >> 1) & 0x07E0) + \
			((((c1 & 0xF81F)      + (c2 & 0xF81F)) >> 1) & 0xF81F))

		if(y >= snesHeight)
		{
			// beyond SNES image - make the row black
			memset(d, 0, width*3);
		}
		else

#ifdef LSB_FIRST
		if (GUI.RedShift < GUI.BlueShift)
#else
		if (GUI.RedShift > GUI.BlueShift)
#endif
        {
			// Order is RGB
			if(!doubledX)
			{
				for (int x = 0; x < width; x++)
				{
					uint32 pixel = *s++;
					*(d + 0) = (pixel >> (11 - 3)) & 0xf8;
					*(d + 1) = (pixel >> (6 - 3)) & 0xf8;
					*(d + 2) = (pixel & 0x1f) << 3;
					d += 3;
				}
			}
			else // high-res x, blend:
			{
				for (int x = 0; x < width; x++)
				{
					uint32 pixel = Interp(s[0],s[1]);
					s += 2;
					*(d + 0) = (pixel >> (11 - 3)) & 0xf8;
					*(d + 1) = (pixel >> (6 - 3)) & 0xf8;
					*(d + 2) = (pixel & 0x1f) << 3;
					d += 3;
				}
			}
        }
        else
        {
			// Order is BGR
			if(!doubledX)
			{
				for (int x = 0; x < width; x++)
				{
					uint32 pixel = *s++;
					*(d + 0) = (pixel & 0x1f) << 3;
					*(d + 1) = (pixel >> (6 - 3)) & 0xf8;
					*(d + 2) = (pixel >> (11 - 3)) & 0xf8;
					d += 3;
				}
			}
			else // high-res x, blend:
			{
				for (int x = 0; x < width; x++)
				{
					uint32 pixel = Interp(s[0],s[1]);
					s += 2;
					*(d + 0) = (pixel & 0x1f) << 3;
					*(d + 1) = (pixel >> (6 - 3)) & 0xf8;
					*(d + 2) = (pixel >> (11 - 3)) & 0xf8;
					d += 3;
				}
			}
        }
    }
}

void Convert16To32 (SSurface *src, SSurface *dst, RECT *srect)
{
    int height = srect->bottom - srect->top;
    int width = srect->right - srect->left;
    int offset1 = srect->top * src->Pitch + srect->left * 2;
    int offset2 = 0;//((dst->Height - height) >> 1) * dst->Pitch +
        //((dst->Width - width) >> 1) * sizeof (uint32);

    for (register int y = 0; y < height; y++)
    {
        register uint16 *s = (uint16 *) ((uint8 *) src->Surface + y * src->Pitch + offset1);
        register uint32 *d = (uint32 *) ((uint8 *) dst->Surface +
                                         y * dst->Pitch + offset2);
        for (register int x = 0; x < width; x++)
        {
            uint32 pixel = *s++;
            *d++ = (((pixel >> 11) & 0x1f) << GUI.RedShift) |
                   (((pixel >> 6) & 0x1f) << GUI.GreenShift) |
                   ((pixel & 0x1f) << GUI.BlueShift);
        }
    }
}

void ConvertDepth (SSurface *src, SSurface *dst, RECT *srect)
{
    // SNES image has been rendered in 16-bit, RGB565 format
    switch (GUI.ScreenDepth)
    {
        case 15: // is this right?
        case 16:
            break;
        case 24:
            Convert16To24 (src, dst, srect);
            break;
        case 32:
            Convert16To32 (src, dst, srect);
            break;
    }
}

/* Depth conversion functions end */


/* The rest of the functions are recreations of the core string display functions with additional scaling.
   They provide the possibility to render the messages into a surface other than the core GFX.Screen.
*/

void WinDisplayStringFromBottom (const char *string, int linesFromBottom, int pixelsFromLeft, bool allowWrap)
{
	if(Settings.StopEmulation)
		return;
	if(Settings.AutoDisplayMessages) {
		WinSetCustomDisplaySurface((void *)GFX.Screen, GFX.RealPPL, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight, 1);
		WinDisplayStringInBuffer<uint16>(string, linesFromBottom, pixelsFromLeft, allowWrap);
	} else
		if(GUI.ScreenDepth == 32) {
			WinDisplayStringInBuffer<uint32>(string, linesFromBottom, pixelsFromLeft, allowWrap);
		} else {
			WinDisplayStringInBuffer<uint16>(string, linesFromBottom, pixelsFromLeft, allowWrap);
		}
}

static int	font_width = 8, font_height = 9;
static void *displayScreen;
int displayPpl, displayWidth, displayHeight, displayScale, fontwidth_scaled, fontheight_scaled;

void WinSetCustomDisplaySurface(void *screen, int ppl, int width, int height, int scale)
{
	displayScreen=screen;
	displayPpl=ppl;
	displayWidth=width;
	displayHeight=height;
	displayScale=max(1,width/IPPU.RenderedScreenWidth);
	fontwidth_scaled=font_width*displayScale;
	fontheight_scaled=font_height*displayScale;
}

template<typename screenPtrType>
void WinDisplayChar (screenPtrType *s, uint8 c)
{
	int h, w;

	int	line   = ((c - 32) >> 4) * fontheight_scaled;
	int	offset = ((c - 32) & 15) * fontwidth_scaled;

	if (GUI.filterMessagFont && (displayScale == 2 || displayScale == 3))
	{
		if (displayScale == 2) {
			for (h = 0; h < fontheight_scaled; h += 2, line += 2, s += 2 * displayPpl - fontwidth_scaled)
				for (w = 0; w < fontwidth_scaled; w += 2, s += 2)
					FontPixToScreenEPX((offset + w) / 2, line / 2, s);
		}
		else if (displayScale == 3) {
			for (h = 0; h < fontheight_scaled; h += 3, line += 3, s += 3 * displayPpl - fontwidth_scaled)
				for (w = 0; w < fontwidth_scaled; w += 3, s += 3)
					FontPixToScreenEPXSimple3((offset + w) / 3, line / 3, s);
		}
	}
	else
	{
		for(h=0; h<fontheight_scaled; h++, line++, s+=displayPpl-fontwidth_scaled)
			for(w=0; w<fontwidth_scaled; w++, s++)
				FontPixToScreen(font [(line)/displayScale] [(offset + w)/displayScale], s);
	}
}

static inline void FontPixToScreen(char p, uint16 *s)
{
	if(p == '#')
	{
		*s = Settings.DisplayColor;
	}
	else if(p == '.')
	{
		static const uint16 black = BUILD_PIXEL(0,0,0);
		*s = black;
	}
}

static inline void FontPixToScreen(char p, uint32 *s)
{
#define CONVERT_16_TO_32(pixel) \
    (((((pixel) >> 11)        ) << /*RedShift+3*/  19) | \
     ((((pixel) >> 6)   & 0x1f) << /*GreenShift+3*/11) | \
      (((pixel)         & 0x1f) << /*BlueShift+3*/ 3))

	if(p == '#')
	{
		*s = CONVERT_16_TO_32(Settings.DisplayColor);
	}
	else if(p == '.')
	{
		static const uint32 black = CONVERT_16_TO_32(BUILD_PIXEL(0,0,0));
		*s = black;
	}
}

#define CHOOSE(c1) ((c1=='#'||X=='#') ? '#' : ((c1=='.'||X=='.') ? '.' : c1))

template<typename screenPtrType>
static inline void FontPixToScreenEPX(int x, int y, screenPtrType *s)
{
	const char X = font[y][x];                // E D H
	const char A = x>0  ?font[y][x-1]:' ';    // A X C
	const char C = x<143?font[y][x+1]:' ';    // F B G
	if (A != C)
	{
		const char D = y>0  ?font[y-1][x]:' ';
		const char B = y<125?font[y+1][x]:' ';
		if (B != D)
		{
			FontPixToScreen((D == A) ? CHOOSE(D) : X, s);
			FontPixToScreen((C == D) ? CHOOSE(C) : X, s+1);
			FontPixToScreen((A == B) ? CHOOSE(A) : X, s+displayPpl);
			FontPixToScreen((B == C) ? CHOOSE(B) : X, s+displayPpl+1);
			return;
		}
	}
	FontPixToScreen(X, s);
	FontPixToScreen(X, s+1);
	FontPixToScreen(X, s+displayPpl);
	FontPixToScreen(X, s+displayPpl+1);
}
#undef CHOOSE

#define CHOOSE(c1) ((X=='#') ? '#' : c1)
template<typename screenPtrType>
inline void FontPixToScreenEPXSimple3(int x, int y, screenPtrType *s)
{
	const char X = font[y][x];                // E D H
	const char A = x>0  ?font[y][x-1]:' ';    // A X C
	const char C = x<143?font[y][x+1]:' ';    // F B G
	const char D = y>0  ?font[y-1][x]:' ';
	const char B = y<125?font[y+1][x]:' ';
	const bool XnE = y>0  &&x>0  ?(X != font[y-1][x-1]):X!=' ';
	const bool XnF = y<125&&x<143?(X != font[y+1][x-1]):X!=' ';
	const bool XnG = y<125&&x>0  ?(X != font[y+1][x+1]):X!=' ';
	const bool XnH = y>0  &&x<143?(X != font[y-1][x+1]):X!=' ';
	const bool DA = D == A && (XnE || CHOOSE(D)!=X);
	const bool AB = A == B && (XnF || CHOOSE(A)!=X);
	const bool BC = B == C && (XnG || CHOOSE(B)!=X);
	const bool CD = C == D && (XnH || CHOOSE(C)!=X);
	FontPixToScreen(DA ? A : X, s);
	FontPixToScreen(X, s+1);
	FontPixToScreen(CD ? C : X, s+2);
	FontPixToScreen(X, s+displayPpl);
	FontPixToScreen(X, s+displayPpl+1);
	FontPixToScreen(X, s+displayPpl+2);
	FontPixToScreen(AB ? A : X, s+displayPpl+displayPpl);
	FontPixToScreen(X, s+displayPpl+displayPpl+1);
	FontPixToScreen(BC ? C : X, s+displayPpl+displayPpl+2);
}
#undef CHOOSE

template<typename screenPtrType>
void WinDisplayStringInBuffer (const char *string, int linesFromBottom, int pixelsFromLeft, bool allowWrap)
{
	if (linesFromBottom <= 0)
		linesFromBottom = 1;

	screenPtrType	*dst = (screenPtrType	*)displayScreen + (displayHeight - fontheight_scaled * linesFromBottom) * displayPpl + (int)(pixelsFromLeft * (float)displayWidth/IPPU.RenderedScreenWidth);

	int	len = strlen(string);
	int	max_chars = displayWidth / (fontwidth_scaled - displayScale);
	int	char_count = 0;

	for (int i = 0 ; i < len ; i++, char_count++)
	{
		if (char_count >= max_chars || (uint8) string[i] < 32)
		{
			if (!allowWrap)
				break;

			dst += fontheight_scaled * displayPpl - (fontwidth_scaled - displayScale) * max_chars;
			if (dst >= (screenPtrType	*)displayScreen + displayHeight * displayPpl)
				break;

			char_count -= max_chars;
		}

		if ((uint8) string[i] < 32)
			continue;

		WinDisplayChar(dst, string[i]);
		dst += fontwidth_scaled - displayScale;
	}
}