SDLPAL/input.c

/* -*- mode: c; tab-width: 4; c-basic-offset: 3; c-file-style: "linux" -*- */
//
// Copyright (c) 2009, Wei Mingzhi <whistler_wmz@users.sf.net>.
// Portions Copyright (c) 2009, netwan.
//
// All rights reserved.
//
// This file is part of SDLPAL.
//
// SDLPAL is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

#include "main.h"
#include <math.h>

volatile PALINPUTSTATE   g_InputState;
static SDL_Joystick     *g_pJoy = NULL;
BOOL                     g_fUseJoystick = TRUE;

#if defined(GPH)
#define MIN_DEADZONE -16384
#define MAX_DEADZONE 16384
#endif

static VOID
PAL_KeyboardEventFilter(
   const SDL_Event       *lpEvent
)
/*++
  Purpose:

    Handle keyboard events.

  Parameters:

    [IN]  lpEvent - pointer to the event.

  Return value:

    None.

--*/
{
   switch (lpEvent->type)
   {
   case SDL_KEYDOWN:
      //
      // Pressed a key
      //
      if (lpEvent->key.keysym.mod & KMOD_ALT)
      {
         if (lpEvent->key.keysym.sym == SDLK_RETURN)
         {
            //
            // Pressed Alt+Enter (toggle fullscreen)...
            //
            VIDEO_ToggleFullscreen();
            return;
         }
         else if (lpEvent->key.keysym.sym == SDLK_F4)
         {
            //
            // Pressed Alt+F4 (Exit program)...
            //
            PAL_Shutdown();
            exit(0);
         }
      }

      switch (lpEvent->key.keysym.sym)
      {
#ifdef __SYMBIAN32__
      //
      // Symbian-specific stuff
      //
      case SDLK_0:
         VIDEO_ToggleScaleScreen();
         break;
      case SDLK_1:
         SOUND_AdjustVolume(0);
         break;
      case SDLK_3:
         SOUND_AdjustVolume(1);
         break;
#endif

      case SDLK_UP:
      case SDLK_KP8:
         g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
         g_InputState.dir = kDirNorth;
         g_InputState.dwKeyPress |= kKeyUp;
         break;

      case SDLK_DOWN:
      case SDLK_KP2:
         g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
         g_InputState.dir = kDirSouth;
         g_InputState.dwKeyPress |= kKeyDown;
         break;

      case SDLK_LEFT:
      case SDLK_KP4:
         g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
         g_InputState.dir = kDirWest;
         g_InputState.dwKeyPress |= kKeyLeft;
         break;

      case SDLK_RIGHT:
      case SDLK_KP6:
         g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
         g_InputState.dir = kDirEast;
         g_InputState.dwKeyPress |= kKeyRight;
         break;

#if defined(DINGOO)
      case SDLK_SPACE:
		 g_InputState.dwKeyPress = kKeyMenu;
         break;

      case SDLK_LCTRL:
		 g_InputState.dwKeyPress = kKeySearch;
         break;
#else
      case SDLK_ESCAPE:
      case SDLK_INSERT:
      case SDLK_LALT:
      case SDLK_RALT:
      case SDLK_KP0:
         g_InputState.dwKeyPress |= kKeyMenu;
         break;

      case SDLK_RETURN:
      case SDLK_SPACE:
      case SDLK_KP_ENTER:
      case SDLK_LCTRL:
         g_InputState.dwKeyPress |= kKeySearch;
         break;

      case SDLK_PAGEUP:
      case SDLK_KP9:
         g_InputState.dwKeyPress |= kKeyPgUp;
         break;

      case SDLK_PAGEDOWN:
      case SDLK_KP3:
         g_InputState.dwKeyPress |= kKeyPgDn;
         break;

      case SDLK_7: //7 for mobile device
      case SDLK_r:
         g_InputState.dwKeyPress |= kKeyRepeat;
         break;

      case SDLK_2: //2 for mobile device
      case SDLK_a:
         g_InputState.dwKeyPress |= kKeyAuto;
         break;

      case SDLK_d:
         g_InputState.dwKeyPress |= kKeyDefend;
         break;

      case SDLK_e:
         g_InputState.dwKeyPress |= kKeyUseItem;
         break;

      case SDLK_w:
         g_InputState.dwKeyPress |= kKeyThrowItem;
         break;

      case SDLK_q:
         g_InputState.dwKeyPress |= kKeyFlee;
         break;

      case SDLK_s:
         g_InputState.dwKeyPress |= kKeyStatus;
         break;

      case SDLK_f:
      case SDLK_5: // 5 for mobile device
         g_InputState.dwKeyPress |= kKeyForce;
         break;

      case SDLK_HASH: //# for mobile device
      case SDLK_p:
         VIDEO_SaveScreenshot();
         break;
#endif

      default:
         break;
      }
      break;

   case SDL_KEYUP:
      //
      // Released a key
      //
      switch (lpEvent->key.keysym.sym)
      {
      case SDLK_UP:
      case SDLK_KP8:
         if (g_InputState.dir == kDirNorth)
         {
            g_InputState.dir = g_InputState.prevdir;
         }
         g_InputState.prevdir = kDirUnknown;
         break;

      case SDLK_DOWN:
      case SDLK_KP2:
         if (g_InputState.dir == kDirSouth)
         {
            g_InputState.dir = g_InputState.prevdir;
         }
         g_InputState.prevdir = kDirUnknown;
         break;

      case SDLK_LEFT:
      case SDLK_KP4:
         if (g_InputState.dir == kDirWest)
         {
            g_InputState.dir = g_InputState.prevdir;
         }
         g_InputState.prevdir = kDirUnknown;
         break;

      case SDLK_RIGHT:
      case SDLK_KP6:
         if (g_InputState.dir == kDirEast)
         {
            g_InputState.dir = g_InputState.prevdir;
         }
         g_InputState.prevdir = kDirUnknown;
         break;

      default:
         break;
      }
      break;
   }
}

static VOID
PAL_MouseEventFilter(
   const SDL_Event *lpEvent
)
/*++
  Purpose:

    Handle mouse events.

  Parameters:

    [IN]  lpEvent - pointer to the event.

  Return value:

    None.

--*/
{
#ifdef PAL_HAS_MOUSE
   static short hitTest = 0; // Double click detect;	
   const SDL_VideoInfo *vi;

   double       screenWidth, gridWidth;
   double       screenHeight, gridHeight;
   double       mx, my;
   double       thumbx;
   double       thumby;
   INT          gridIndex;
   BOOL			isLeftMouseDBClick = FALSE;
   BOOL			isLeftMouseClick = FALSE;
   BOOL			isRightMouseClick = FALSE;
   static INT   lastReleaseButtonTime, lastPressButtonTime, betweenTime;
   static INT   lastPressx = 0;
   static INT   lastPressy = 0;
   static INT   lastReleasex = 0;
   static INT   lastReleasey = 0;

   if (lpEvent->type!= SDL_MOUSEBUTTONDOWN && lpEvent->type != SDL_MOUSEBUTTONUP)
      return;

   vi = SDL_GetVideoInfo();
   screenWidth = vi->current_w;
   screenHeight = vi->current_h;
   gridWidth = screenWidth / 3;
   gridHeight = screenHeight / 3;
   mx = lpEvent->button.x;
   my = lpEvent->button.y;
   thumbx = ceil(mx / gridWidth);
   thumby = floor(my / gridHeight);
   gridIndex = thumbx + thumby * 3 - 1;
   
   switch (lpEvent->type)
   {
   case SDL_MOUSEBUTTONDOWN:
      lastPressButtonTime = SDL_GetTicks();
      lastPressx = lpEvent->button.x;
      lastPressy = lpEvent->button.y;
      switch (gridIndex)
      {
      case 2:
         g_InputState.prevdir = g_InputState.dir;
         g_InputState.dir = kDirNorth;
         break;
      case 6:
         g_InputState.prevdir = g_InputState.dir;
         g_InputState.dir = kDirSouth;
         break;
      case 0:
         g_InputState.prevdir = g_InputState.dir;
         g_InputState.dir = kDirWest;
         break;
      case 8:
         g_InputState.prevdir = g_InputState.dir;
         g_InputState.dir = kDirEast;
         break;
      case 1:
    	 //g_InputState.prevdir = g_InputState.dir;
    	 //g_InputState.dir = kDirNorth;
         g_InputState.dwKeyPress |= kKeyUp;
         break;
      case 7:
    	 //g_InputState.prevdir = g_InputState.dir;
    	 //g_InputState.dir = kDirSouth; 
         g_InputState.dwKeyPress |= kKeyDown;
         break;
      case 3:
    	 //g_InputState.prevdir = g_InputState.dir;
    	 //g_InputState.dir = kDirWest;
    	 g_InputState.dwKeyPress |= kKeyLeft;
         break;
      case 5:
         //g_InputState.prevdir = g_InputState.dir;
         //g_InputState.dir = kDirEast;
         g_InputState.dwKeyPress |= kKeyRight;
         break;
      }
      break;
   case SDL_MOUSEBUTTONUP:
      lastReleaseButtonTime = SDL_GetTicks();
      lastReleasex = lpEvent->button.x;
      lastReleasey = lpEvent->button.y;
      hitTest ++;
      if (abs(lastPressx - lastReleasex) < 25 &&
                     abs(lastPressy - lastReleasey) < 25)
      {
		  betweenTime = lastReleaseButtonTime - lastPressButtonTime;
		  if (betweenTime >500)
		  {
			  isRightMouseClick = TRUE;
		  }
		  else if (betweenTime >=0)
		  {
			  if((betweenTime < 100) && (hitTest >= 2))
			  {
				  isLeftMouseClick = TRUE;
			  	  hitTest = 0;  
			  }
			  else
			  {  
				  isLeftMouseClick = TRUE;
				  if(betweenTime > 100)
				  {
					  hitTest = 0;
				  }
				  
			  }
		  }
      }
      switch (gridIndex)
      {
      case 2:
    	 if( isLeftMouseDBClick )
		 {
			 SOUND_AdjustVolume(1);
			 break;
		 }
      case 6:
      case 0:
    	 if( isLeftMouseDBClick )
		 {
			 SOUND_AdjustVolume(0);
			 break;
		 }
      case 7:
    	  if (isRightMouseClick) //repeat attack
    	  {
    	     g_InputState.dwKeyPress |= kKeyRepeat;
    	     break;
    	  }
      case 8:
         g_InputState.dir = kDirUnknown;
         g_InputState.prevdir = kDirUnknown;
         break;
      case 1:
    	 if( isRightMouseClick )
		 {
			 g_InputState.dwKeyPress |= kKeyForce;
		 }
    	 break;
      case 3:
    	 if( isRightMouseClick )
		 {
			 g_InputState.dwKeyPress |= kKeyAuto;
		 }
    	 break;
      case 5:
    	 if( isRightMouseClick )
		 {
			 g_InputState.dwKeyPress |= kKeyDefend;
		 }
		 break;
      case 4:
		if (isRightMouseClick) // menu
		{
		   g_InputState.dwKeyPress |= kKeyMenu;
		}
		else if (isLeftMouseClick) // search
		{
		   g_InputState.dwKeyPress |= kKeySearch;
		}
		
        break;
      }
      break;
   }
#endif
}

static VOID
PAL_JoystickEventFilter(
   const SDL_Event       *lpEvent
)
/*++
  Purpose:

    Handle joystick events.

  Parameters:

    [IN]  lpEvent - pointer to the event.

  Return value:

    None.

--*/
{
#ifdef PAL_HAS_JOYSTICKS
   switch (lpEvent->type)
   {
#if defined (GEKKO)
   case SDL_JOYHATMOTION:
      switch (lpEvent->jhat.value)
      {
      case SDL_HAT_LEFT:
        g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
        g_InputState.dir = kDirWest;
        g_InputState.dwKeyPress = kKeyLeft;
        break;

      case SDL_HAT_RIGHT:
        g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
        g_InputState.dir = kDirEast;
        g_InputState.dwKeyPress = kKeyRight;
        break;

      case SDL_HAT_UP:
        g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
        g_InputState.dir = kDirNorth;
        g_InputState.dwKeyPress = kKeyUp;
        break;

      case SDL_HAT_DOWN:
        g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
        g_InputState.dir = kDirSouth;
        g_InputState.dwKeyPress = kKeyDown;
        break;
      }
      break;
#else
   case SDL_JOYAXISMOTION:
      //
      // Moved an axis on joystick
      //
      switch (lpEvent->jaxis.axis)
      {
      case 0:
         //
         // X axis
         //
#if defined(GPH)
		if (lpEvent->jaxis.value > MAX_DEADZONE) {
			g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
			g_InputState.dir = kDirEast;
			g_InputState.dwKeyPress = kKeyRight;
		} else if (lpEvent->jaxis.value < MIN_DEADZONE) {
			g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
			g_InputState.dir = kDirWest;
			g_InputState.dwKeyPress = kKeyLeft;
		} else {
			g_InputState.dir = kDirUnknown;
		}
#else
         if (lpEvent->jaxis.value > 20000)
         {
            if (g_InputState.dir != kDirEast)
            {
               g_InputState.dwKeyPress |= kKeyRight;
            }
            g_InputState.prevdir = g_InputState.dir;
            g_InputState.dir = kDirEast;
         }
         else if (lpEvent->jaxis.value < -20000)
         {
            if (g_InputState.dir != kDirWest)
            {
               g_InputState.dwKeyPress |= kKeyLeft;
            }
            g_InputState.prevdir = g_InputState.dir;
            g_InputState.dir = kDirWest;
         }
         else
         {
            if (g_InputState.prevdir != kDirEast &&
               g_InputState.prevdir != kDirWest)
            {
               g_InputState.dir = g_InputState.prevdir;
            }
            g_InputState.prevdir = kDirUnknown;
         }
#endif
         break;

      case 1:
         //
         // Y axis
         //
#if defined(GPH)
		if (lpEvent->jaxis.value > MAX_DEADZONE) {
			g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
			g_InputState.dir = kDirSouth;
			g_InputState.dwKeyPress = kKeyDown;
		} else if (lpEvent->jaxis.value < MIN_DEADZONE) {
			g_InputState.prevdir = (gpGlobals->fInBattle ? kDirUnknown : g_InputState.dir);
			g_InputState.dir = kDirNorth;
			g_InputState.dwKeyPress = kKeyUp;
		} else {
			g_InputState.dir = kDirUnknown;
		}
#else
         if (lpEvent->jaxis.value > 20000)
         {
            if (g_InputState.dir != kDirSouth)
            {
               g_InputState.dwKeyPress |= kKeyDown;
            }
            g_InputState.prevdir = g_InputState.dir;
            g_InputState.dir = kDirSouth;
         }
         else if (lpEvent->jaxis.value < -20000)
         {
            if (g_InputState.dir != kDirNorth)
            {
               g_InputState.dwKeyPress |= kKeyUp;
            }
            g_InputState.prevdir = g_InputState.dir;
            g_InputState.dir = kDirNorth;
         }
         else
         {
            if (g_InputState.prevdir != kDirNorth &&
               g_InputState.prevdir != kDirSouth)
            {
               g_InputState.dir = g_InputState.prevdir;
            }
            g_InputState.prevdir = kDirUnknown;
         }
#endif
         break;
      }
      break;
#endif

   case SDL_JOYBUTTONDOWN:
      //
      // Pressed the joystick button
      //
#if defined(GPH)
      switch (lpEvent->jbutton.button)
      {
#if defined(GP2XWIZ)
		case 14:
#elif defined(CAANOO)
		case 3:
#endif
			g_InputState.dwKeyPress = kKeyMenu;
			break;

#if defined(GP2XWIZ)
		case 13:
#elif defined(CAANOO)
		case 2:
#endif
			g_InputState.dwKeyPress = kKeySearch;
			break;
#else
#if defined(GEKKO)
      switch (lpEvent->jbutton.button)
      {
		case 2:
         g_InputState.dwKeyPress |= kKeyMenu;
         break;

		case 3:
         g_InputState.dwKeyPress |= kKeySearch;
         break;
#else
      switch (lpEvent->jbutton.button & 1)
      {
      case 0:
         g_InputState.dwKeyPress |= kKeyMenu;
         break;

      case 1:
         g_InputState.dwKeyPress |= kKeySearch;
         break;
#endif
#endif
      }
      break;
   }
#endif
}

#ifdef PAL_HAS_TOUCH

#define  TOUCH_NONE     0
#define	 TOUCH_UP		1
#define	 TOUCH_DOWN		2
#define	 TOUCH_LEFT		3
#define	 TOUCH_RIGHT	4
#define	 TOUCH_BUTTON1	5
#define	 TOUCH_BUTTON2	6
#define  TOUCH_BUTTON3  7
#define  TOUCH_BUTTON4  8

static int
PAL_GetTouchArea(
   float X,
   float Y
)
{
   if (Y < 0.5)
   {
      //
      // Upper area
      //
	  return TOUCH_NONE;
   }
   else if (X < 1.0 / 3)
   {
      if (Y - 0.5 < (1.0 / 6 - fabs(X - 1.0 / 3 / 2)) * (0.5 / (1.0 / 3)))
      {
         return TOUCH_UP;
      }
	  else if (Y - 0.75 > fabs(X - 1.0 / 3 / 2) * (0.5 / (1.0 / 3)))
	  {
		 return TOUCH_DOWN;
	  }
	  else if (X < 1.0 / 3 / 2 && fabs(Y - 0.75) < 0.25 - X * (0.5 / (1.0 / 3)))
	  {
		 return TOUCH_LEFT;
	  }
	  else
	  {
		 return TOUCH_RIGHT;
	  }
   }
   else if (X > 1.0 - 1.0 / 3)
   {
	  if (X < 1.0 - (1.0 / 3 / 2))
	  {
		 if (Y < 0.75)
		 {
			return TOUCH_BUTTON1;
		 }
		 else
		 {
			return TOUCH_BUTTON3;
		 }
	  }
	  else
	  {
		 if (Y < 0.75)
		 {
			return TOUCH_BUTTON2;
		 }
		 else
		 {
			return TOUCH_BUTTON4;
		 }
	  }
   }

   return TOUCH_NONE;
}

static VOID
PAL_SetTouchAction(
  int area
)
{
   switch (area)
   {
   case TOUCH_UP:
	  g_InputState.dir = kDirNorth;
	  g_InputState.dwKeyPress |= kKeyUp;
	  break;

   case TOUCH_DOWN:
	  g_InputState.dir = kDirSouth;
	  g_InputState.dwKeyPress |= kKeyDown;
	  break;

   case TOUCH_LEFT:
	  g_InputState.dir = kDirWest;
	  g_InputState.dwKeyPress |= kKeyLeft;
	  break;

   case TOUCH_RIGHT:
	  g_InputState.dir = kDirEast;
	  g_InputState.dwKeyPress |= kKeyRight;
	  break;

   case TOUCH_BUTTON1:
      if (gpGlobals->fInBattle)
      {
         g_InputState.dwKeyPress |= kKeyRepeat;
      }
      else
      {
         g_InputState.dwKeyPress |= kKeyThrowItem;
      }
	  break;

   case TOUCH_BUTTON2:
	  g_InputState.dwKeyPress |= kKeyMenu;
	  break;

   case TOUCH_BUTTON3:
      g_InputState.dwKeyPress |= kKeyUseItem;
	  break;

   case TOUCH_BUTTON4:
	  g_InputState.dwKeyPress |= kKeySearch;
	  break;
   }
}

static VOID
PAL_UnsetTouchAction(
  int area
)
{
   switch (area)
   {
   case TOUCH_UP:
   case TOUCH_DOWN:
   case TOUCH_LEFT:
   case TOUCH_RIGHT:
	  g_InputState.dir = kDirUnknown;
	  break;
   }
}
#endif

static VOID
PAL_TouchEventFilter(
   const SDL_Event *lpEvent
)
/*++
  Purpose:

    Handle touch events.

  Parameters:

    [IN]  lpEvent - pointer to the event.

  Return value:

    None.

--*/
{
#ifdef PAL_HAS_TOUCH
   static SDL_TouchID finger1 = -1, finger2 = -1;
   static int prev_touch1 = TOUCH_NONE;
   static int prev_touch2 = TOUCH_NONE;

   switch (lpEvent->type)
   {
   case SDL_FINGERDOWN:
	  if (finger1 == -1)
	  {
         int area = PAL_GetTouchArea(lpEvent->tfinger.x, lpEvent->tfinger.y);

         finger1 = lpEvent->tfinger.fingerId;
         prev_touch1 = area;
         PAL_SetTouchAction(area);
	  }
	  else if (finger2 == -1)
	  {
         int area = PAL_GetTouchArea(lpEvent->tfinger.x, lpEvent->tfinger.y);

         finger2 = lpEvent->tfinger.fingerId;
         prev_touch2 = area;
         PAL_SetTouchAction(area);
	  }
	  break;

   case SDL_FINGERUP:
	  if (lpEvent->tfinger.fingerId == finger1)
	  {
		 PAL_UnsetTouchAction(prev_touch1);
		 finger1 = -1;
		 prev_touch1 = TOUCH_NONE;
	  }
	  else if (lpEvent->tfinger.fingerId == finger2)
	  {
		 PAL_UnsetTouchAction(prev_touch2);
		 finger2 = -1;
		 prev_touch2 = TOUCH_NONE;
	  }
	  break;

   case SDL_FINGERMOTION:
      if (lpEvent->tfinger.fingerId == finger1)
      {
         int area = PAL_GetTouchArea(lpEvent->tfinger.x, lpEvent->tfinger.y);
         if (prev_touch1 != area && area != TOUCH_NONE)
         {
            PAL_UnsetTouchAction(prev_touch1);
            prev_touch1 = area;
            PAL_SetTouchAction(area);
         }
      }
      else if (lpEvent->tfinger.fingerId == finger2)
      {
         int area = PAL_GetTouchArea(lpEvent->tfinger.x, lpEvent->tfinger.y);
         if (prev_touch2 != area && area != TOUCH_NONE)
         {
            PAL_UnsetTouchAction(prev_touch2);
            prev_touch2 = area;
            PAL_SetTouchAction(area);
         }
      }
      break;
   }
#endif
}

static int SDLCALL
PAL_EventFilter(
   const SDL_Event       *lpEvent
)

/*++
  Purpose:

    SDL event filter function. A filter to process all events.

  Parameters:

    [IN]  lpEvent - pointer to the event.

  Return value:

    1 = the event will be added to the internal queue.
    0 = the event will be dropped from the queue.

--*/
{
   switch (lpEvent->type)
   {
#if SDL_VERSION_ATLEAST(2,0,0)
   case SDL_WINDOWEVENT:
      if (lpEvent->window.event == SDL_WINDOWEVENT_RESIZED)
      {
         //
         // resized the window
         //
         VIDEO_Resize(lpEvent->window.data1, lpEvent->window.data2);
      }
      break;

#ifdef __IOS__
   case SDL_APP_WILLENTERBACKGROUND:
      g_bRenderPaused = TRUE;
      break;

   case SDL_APP_DIDENTERFOREGROUND:
      g_bRenderPaused = FALSE;
	  VIDEO_UpdateScreen(NULL);
      break;
#endif

#else
           
   case SDL_VIDEORESIZE:
      //
      // resized the window
      //
      VIDEO_Resize(lpEvent->resize.w, lpEvent->resize.h);
      break;
#endif

   case SDL_QUIT:
      //
      // clicked on the close button of the window. Quit immediately.
      //
      PAL_Shutdown();
      exit(0);
   }

   PAL_KeyboardEventFilter(lpEvent);
   PAL_MouseEventFilter(lpEvent);
   PAL_JoystickEventFilter(lpEvent);
   PAL_TouchEventFilter(lpEvent);

   //
   // All events are handled here; don't put anything to the internal queue
   //
   return 0;
}

VOID
PAL_ClearKeyState(
   VOID
)
/*++
  Purpose:

    Clear the record of pressed keys.

  Parameters:

    None.

  Return value:

    None.

--*/
{
   g_InputState.dwKeyPress = 0;
}

VOID
PAL_InitInput(
   VOID
)
/*++
  Purpose:

    Initialize the input subsystem.

  Parameters:

    None.

  Return value:

    None.

--*/
{
   memset((void *)&g_InputState, 0, sizeof(g_InputState));
   g_InputState.dir = kDirUnknown;
   g_InputState.prevdir = kDirUnknown;

   //
   // Check for joystick
   //
#ifdef PAL_HAS_JOYSTICKS
   if (SDL_NumJoysticks() > 0 && g_fUseJoystick)
   {
      g_pJoy = SDL_JoystickOpen(0);
      if (g_pJoy != NULL)
      {
         SDL_JoystickEventState(SDL_ENABLE);
      }
   }
#endif
}

VOID
PAL_ShutdownInput(
   VOID
)
/*++
  Purpose:

    Shutdown the input subsystem.

  Parameters:

    None.

  Return value:

    None.

--*/
{
#ifdef PAL_HAS_JOYSTICKS
#if SDL_VERSION_ATLEAST(2,0,0)
   if (g_pJoy != NULL)
   {
      SDL_JoystickClose(g_pJoy);
      g_pJoy = NULL;
   }
#else
   if (SDL_JoystickOpened(0))
   {
      assert(g_pJoy != NULL);
      SDL_JoystickClose(g_pJoy);
      g_pJoy = NULL;
   }
#endif
#endif
}

VOID
PAL_ProcessEvent(
   VOID
)
/*++
  Purpose:

    Process all events.

  Parameters:

    None.

  Return value:

    None.

--*/
{
#ifdef PAL_HAS_NATIVEMIDI
   MIDI_CheckLoop();
#endif
   while (PAL_PollEvent(NULL));
}

int
PAL_PollEvent(
   SDL_Event *event
)
/*++
  Purpose:

    Poll and process one event.

  Parameters:

    [OUT] event - Events polled from SDL.

  Return value:

    Return value of PAL_PollEvent.

--*/
{
   SDL_Event evt;

   int ret = SDL_PollEvent(&evt);
   if (ret != 0)
   {
	  PAL_EventFilter(&evt);
   }

   if (event != NULL)
   {
	  *event = evt;
   }

   return ret;
}