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//
// ID Engine
// ID_IN.c - Input Manager
// v1.0d1
// By Jason Blochowiak
//
//
// This module handles dealing with the various input devices
//
// Depends on: Memory Mgr (for demo recording), Sound Mgr (for timing stuff),
// User Mgr (for command line parms)
//
// Globals:
// LastScan - The keyboard scan code of the last key pressed
// LastASCII - The ASCII value of the last key pressed
// DEBUG - there are more globals
//
#include "ID_HEADS.H"
#pragma hdrstop
#define KeyInt 9 // The keyboard ISR number
//
// mouse constants
//
#define MReset 0
#define MButtons 3
#define MDelta 11
#define MouseInt 0x33
#define Mouse(x) _AX = x,geninterrupt(MouseInt)
//
// joystick constants
//
#define JoyScaleMax 32768
#define JoyScaleShift 8
#define MaxJoyValue 5000
/*
=============================================================================
GLOBAL VARIABLES
=============================================================================
*/
//
// configuration variables
//
boolean MousePresent;
boolean JoysPresent[MaxJoys];
boolean JoyPadPresent;
// Global variables
boolean Keyboard[NumCodes];
boolean Paused;
char LastASCII;
ScanCode LastScan;
KeyboardDef KbdDefs = {0x1d,0x38,0x47,0x48,0x49,0x4b,0x4d,0x4f,0x50,0x51};
JoystickDef JoyDefs[MaxJoys];
ControlType Controls[MaxPlayers];
longword MouseDownCount;
Demo DemoMode = demo_Off;
byte _seg *DemoBuffer;
word DemoOffset,DemoSize;
/*
=============================================================================
LOCAL VARIABLES
=============================================================================
*/
static byte far ASCIINames[] = // Unshifted ASCII for scan codes
{
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0 ,27 ,'1','2','3','4','5','6','7','8','9','0','-','=',8 ,9 , // 0
'q','w','e','r','t','y','u','i','o','p','[',']',13 ,0 ,'a','s', // 1
'd','f','g','h','j','k','l',';',39 ,'`',0 ,92 ,'z','x','c','v', // 2
'b','n','m',',','.','/',0 ,'*',0 ,' ',0 ,0 ,0 ,0 ,0 ,0 , // 3
0 ,0 ,0 ,0 ,0 ,0 ,0 ,'7','8','9','-','4','5','6','+','1', // 4
'2','3','0',127,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 5
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 6
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 // 7
},
far ShiftNames[] = // Shifted ASCII for scan codes
{
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0 ,27 ,'!','@','#','$','%','^','&','*','(',')','_','+',8 ,9 , // 0
'Q','W','E','R','T','Y','U','I','O','P','{','}',13 ,0 ,'A','S', // 1
'D','F','G','H','J','K','L',':',34 ,'~',0 ,'|','Z','X','C','V', // 2
'B','N','M','<','>','?',0 ,'*',0 ,' ',0 ,0 ,0 ,0 ,0 ,0 , // 3
0 ,0 ,0 ,0 ,0 ,0 ,0 ,'7','8','9','-','4','5','6','+','1', // 4
'2','3','0',127,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 5
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 6
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 // 7
},
far SpecialNames[] = // ASCII for 0xe0 prefixed codes
{
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 0
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,13 ,0 ,0 ,0 , // 1
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 2
0 ,0 ,0 ,0 ,0 ,'/',0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 3
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 4
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 5
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 , // 6
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 // 7
};
static boolean IN_Started;
static boolean CapsLock;
static ScanCode CurCode,LastCode;
static Direction DirTable[] = // Quick lookup for total direction
{
dir_NorthWest, dir_North, dir_NorthEast,
dir_West, dir_None, dir_East,
dir_SouthWest, dir_South, dir_SouthEast
};
static void (*INL_KeyHook)(void);
static void interrupt (*OldKeyVect)(void);
static char *ParmStrings[] = {"nojoys","nomouse",nil};
// Internal routines
///////////////////////////////////////////////////////////////////////////
//
// INL_KeyService() - Handles a keyboard interrupt (key up/down)
//
///////////////////////////////////////////////////////////////////////////
static void interrupt
INL_KeyService(void)
{
static boolean special;
byte k,c,
temp;
int i;
k = inportb(0x60); // Get the scan code
// Tell the XT keyboard controller to clear the key
outportb(0x61,(temp = inportb(0x61)) | 0x80);
outportb(0x61,temp);
if (k == 0xe0) // Special key prefix
special = true;
else if (k == 0xe1) // Handle Pause key
Paused = true;
else
{
if (k & 0x80) // Break code
{
k &= 0x7f;
// DEBUG - handle special keys: ctl-alt-delete, print scrn
Keyboard[k] = false;
}
else // Make code
{
LastCode = CurCode;
CurCode = LastScan = k;
Keyboard[k] = true;
if (special)
c = SpecialNames[k];
else
{
if (k == sc_CapsLock)
{
CapsLock ^= true;
// DEBUG - make caps lock light work
}
if (Keyboard[sc_LShift] || Keyboard[sc_RShift]) // If shifted
{
c = ShiftNames[k];
if ((c >= 'A') && (c <= 'Z') && CapsLock)
c += 'a' - 'A';
}
else
{
c = ASCIINames[k];
if ((c >= 'a') && (c <= 'z') && CapsLock)
c -= 'a' - 'A';
}
}
if (c)
LastASCII = c;
}
special = false;
}
if (INL_KeyHook && !special)
INL_KeyHook();
outportb(0x20,0x20);
}
///////////////////////////////////////////////////////////////////////////
//
// INL_GetMouseDelta() - Gets the amount that the mouse has moved from the
// mouse driver
//
///////////////////////////////////////////////////////////////////////////
static void
INL_GetMouseDelta(int *x,int *y)
{
Mouse(MDelta);
*x = _CX;
*y = _DX;
}
///////////////////////////////////////////////////////////////////////////
//
// INL_GetMouseButtons() - Gets the status of the mouse buttons from the
// mouse driver
//
///////////////////////////////////////////////////////////////////////////
static word
INL_GetMouseButtons(void)
{
word buttons;
Mouse(MButtons);
buttons = _BX;
return(buttons);
}
///////////////////////////////////////////////////////////////////////////
//
// IN_GetJoyAbs() - Reads the absolute position of the specified joystick
//
///////////////////////////////////////////////////////////////////////////
void
IN_GetJoyAbs(word joy,word *xp,word *yp)
{
byte xb,yb,
xs,ys;
word x,y;
x = y = 0;
xs = joy? 2 : 0; // Find shift value for x axis
xb = 1 << xs; // Use shift value to get x bit mask
ys = joy? 3 : 1; // Do the same for y axis
yb = 1 << ys;
// Read the absolute joystick values
asm pushf // Save some registers
asm push si
asm push di
asm cli // Make sure an interrupt doesn't screw the timings
asm mov dx,0x201
asm in al,dx
asm out dx,al // Clear the resistors
asm mov ah,[xb] // Get masks into registers
asm mov ch,[yb]
asm xor si,si // Clear count registers
asm xor di,di
asm xor bh,bh // Clear high byte of bx for later
asm push bp // Don't mess up stack frame
asm mov bp,MaxJoyValue
loop:
asm in al,dx // Get bits indicating whether all are finished
asm dec bp // Check bounding register
asm jz done // We have a silly value - abort
asm mov bl,al // Duplicate the bits
asm and bl,ah // Mask off useless bits (in [xb])
asm add si,bx // Possibly increment count register
asm mov cl,bl // Save for testing later
asm mov bl,al
asm and bl,ch // [yb]
asm add di,bx
asm add cl,bl
asm jnz loop // If both bits were 0, drop out
done:
asm pop bp
asm mov cl,[xs] // Get the number of bits to shift
asm shr si,cl // and shift the count that many times
asm mov cl,[ys]
asm shr di,cl
asm mov [x],si // Store the values into the variables
asm mov [y],di
asm pop di
asm pop si
asm popf // Restore the registers
*xp = x;
*yp = y;
}
///////////////////////////////////////////////////////////////////////////
//
// INL_GetJoyDelta() - Returns the relative movement of the specified
// joystick (from +/-127)
//
///////////////////////////////////////////////////////////////////////////
void INL_GetJoyDelta(word joy,int *dx,int *dy)
{
word x,y;
longword time;
JoystickDef *def;
static longword lasttime;
IN_GetJoyAbs(joy,&x,&y);
def = JoyDefs + joy;
if (x < def->threshMinX)
{
if (x < def->joyMinX)
x = def->joyMinX;
x = -(x - def->threshMinX);
x *= def->joyMultXL;
x >>= JoyScaleShift;
*dx = (x > 127)? -127 : -x;
}
else if (x > def->threshMaxX)
{
if (x > def->joyMaxX)
x = def->joyMaxX;
x = x - def->threshMaxX;
x *= def->joyMultXH;
x >>= JoyScaleShift;
*dx = (x > 127)? 127 : x;
}
else
*dx = 0;
if (y < def->threshMinY)
{
if (y < def->joyMinY)
y = def->joyMinY;
y = -(y - def->threshMinY);
y *= def->joyMultYL;
y >>= JoyScaleShift;
*dy = (y > 127)? -127 : -y;
}
else if (y > def->threshMaxY)
{
if (y > def->joyMaxY)
y = def->joyMaxY;
y = y - def->threshMaxY;
y *= def->joyMultYH;
y >>= JoyScaleShift;
*dy = (y > 127)? 127 : y;
}
else
*dy = 0;
lasttime = TimeCount;
}
///////////////////////////////////////////////////////////////////////////
//
// INL_GetJoyButtons() - Returns the button status of the specified
// joystick
//
///////////////////////////////////////////////////////////////////////////
static word
INL_GetJoyButtons(word joy)
{
register word result;
result = inportb(0x201); // Get all the joystick buttons
result >>= joy? 6 : 4; // Shift into bits 0-1
result &= 3; // Mask off the useless bits
result ^= 3;
return(result);
}
///////////////////////////////////////////////////////////////////////////
//
// IN_GetJoyButtonsDB() - Returns the de-bounced button status of the
// specified joystick
//
///////////////////////////////////////////////////////////////////////////
word
IN_GetJoyButtonsDB(word joy)
{
longword lasttime;
word result1,result2;
do
{
result1 = INL_GetJoyButtons(joy);
lasttime = TimeCount;
while (TimeCount == lasttime)
;
result2 = INL_GetJoyButtons(joy);
} while (result1 != result2);
return(result1);
}
///////////////////////////////////////////////////////////////////////////
//
// INL_StartKbd() - Sets up my keyboard stuff for use
//
///////////////////////////////////////////////////////////////////////////
static void
INL_StartKbd(void)
{
INL_KeyHook = NULL; // no key hook routine
IN_ClearKeysDown();
OldKeyVect = getvect(KeyInt);
setvect(KeyInt,INL_KeyService);
}
///////////////////////////////////////////////////////////////////////////
//
// INL_ShutKbd() - Restores keyboard control to the BIOS
//
///////////////////////////////////////////////////////////////////////////
static void
INL_ShutKbd(void)
{
poke(0x40,0x17,peek(0x40,0x17) & 0xfaf0); // Clear ctrl/alt/shift flags
setvect(KeyInt,OldKeyVect);
}
///////////////////////////////////////////////////////////////////////////
//
// INL_StartMouse() - Detects and sets up the mouse
//
///////////////////////////////////////////////////////////////////////////
static boolean
INL_StartMouse(void)
{
#if 0
if (getvect(MouseInt))
{
Mouse(MReset);
if (_AX == 0xffff)
return(true);
}
return(false);
#endif
union REGS regs;
unsigned char far *vector;
if ((vector=MK_FP(peek(0,0x33*4+2),peek(0,0x33*4)))==NULL)
return false;
if (*vector == 207)
return false;
Mouse(MReset);
return true;
}
///////////////////////////////////////////////////////////////////////////
//
// INL_ShutMouse() - Cleans up after the mouse
//
///////////////////////////////////////////////////////////////////////////
static void
INL_ShutMouse(void)
{
}
//
// INL_SetJoyScale() - Sets up scaling values for the specified joystick
//
static void
INL_SetJoyScale(word joy)
{
JoystickDef *def;
def = &JoyDefs[joy];
def->joyMultXL = JoyScaleMax / (def->threshMinX - def->joyMinX);
def->joyMultXH = JoyScaleMax / (def->joyMaxX - def->threshMaxX);
def->joyMultYL = JoyScaleMax / (def->threshMinY - def->joyMinY);
def->joyMultYH = JoyScaleMax / (def->joyMaxY - def->threshMaxY);
}
///////////////////////////////////////////////////////////////////////////
//
// IN_SetupJoy() - Sets up thresholding values and calls INL_SetJoyScale()
// to set up scaling values
//
///////////////////////////////////////////////////////////////////////////
void
IN_SetupJoy(word joy,word minx,word maxx,word miny,word maxy)
{
word d,r;
JoystickDef *def;
def = &JoyDefs[joy];
def->joyMinX = minx;
def->joyMaxX = maxx;
r = maxx - minx;
d = r / 3;
def->threshMinX = ((r / 2) - d) + minx;
def->threshMaxX = ((r / 2) + d) + minx;
def->joyMinY = miny;
def->joyMaxY = maxy;
r = maxy - miny;
d = r / 3;
def->threshMinY = ((r / 2) - d) + miny;
def->threshMaxY = ((r / 2) + d) + miny;
INL_SetJoyScale(joy);
}
///////////////////////////////////////////////////////////////////////////
//
// INL_StartJoy() - Detects & auto-configures the specified joystick
// The auto-config assumes the joystick is centered
//
///////////////////////////////////////////////////////////////////////////
static boolean
INL_StartJoy(word joy)
{
word x,y;
IN_GetJoyAbs(joy,&x,&y);
if
(
((x == 0) || (x > MaxJoyValue - 10))
|| ((y == 0) || (y > MaxJoyValue - 10))
)
return(false);
else
{
IN_SetupJoy(joy,0,x * 2,0,y * 2);
return(true);
}
}
///////////////////////////////////////////////////////////////////////////
//
// INL_ShutJoy() - Cleans up the joystick stuff
//
///////////////////////////////////////////////////////////////////////////
static void
INL_ShutJoy(word joy)
{
JoysPresent[joy] = false;
}
///////////////////////////////////////////////////////////////////////////
//
// IN_Startup() - Starts up the Input Mgr
//
///////////////////////////////////////////////////////////////////////////
void
IN_Startup(void)
{
boolean checkjoys,checkmouse;
word i;
if (IN_Started)
return;
checkjoys = true;
checkmouse = true;
for (i = 1;i < _argc;i++)
{
switch (US_CheckParm(_argv[i],ParmStrings))
{
case 0:
checkjoys = false;
break;
case 1:
checkmouse = false;
break;
}
}
INL_StartKbd();
MousePresent = checkmouse? INL_StartMouse() : false;
for (i = 0;i < MaxJoys;i++)
JoysPresent[i] = checkjoys? INL_StartJoy(i) : false;
IN_Started = true;
}
///////////////////////////////////////////////////////////////////////////
//
// IN_Default() - Sets up default conditions for the Input Mgr
//
///////////////////////////////////////////////////////////////////////////
void
IN_Default(boolean gotit,ControlType in)
{
if
(
(!gotit)
|| ((in == ctrl_Joystick1) && !JoysPresent[0])
|| ((in == ctrl_Joystick2) && !JoysPresent[1])
|| ((in == ctrl_Mouse) && !MousePresent)
)
in = ctrl_Keyboard1;
IN_SetControlType(0,in);
}
///////////////////////////////////////////////////////////////////////////
//
// IN_Shutdown() - Shuts down the Input Mgr
//
///////////////////////////////////////////////////////////////////////////
void
IN_Shutdown(void)
{
word i;
if (!IN_Started)
return;
INL_ShutMouse();
for (i = 0;i < MaxJoys;i++)
INL_ShutJoy(i);
INL_ShutKbd();
IN_Started = false;
}
///////////////////////////////////////////////////////////////////////////
//
// IN_SetKeyHook() - Sets the routine that gets called by INL_KeyService()
// everytime a real make/break code gets hit
//
///////////////////////////////////////////////////////////////////////////
void
IN_SetKeyHook(void (*hook)())
{
INL_KeyHook = hook;
}
///////////////////////////////////////////////////////////////////////////
//
// IN_ClearKeysDown() - Clears the keyboard array
//
///////////////////////////////////////////////////////////////////////////
void
IN_ClearKeysDown(void)
{
int i;
LastScan = sc_None;
LastASCII = key_None;
memset (Keyboard,0,sizeof(Keyboard));
}
///////////////////////////////////////////////////////////////////////////
//
// IN_ReadControl() - Reads the device associated with the specified
// player and fills in the control info struct
//
///////////////////////////////////////////////////////////////////////////
void
IN_ReadControl(int player,ControlInfo *info)
{
boolean realdelta;
byte dbyte;
word buttons;
int dx,dy;
Motion mx,my;
ControlType type;
register KeyboardDef *def;
dx = dy = 0;
mx = my = motion_None;
buttons = 0;
if (DemoMode == demo_Playback)
{
dbyte = DemoBuffer[DemoOffset + 1];
my = (dbyte & 3) - 1;
mx = ((dbyte >> 2) & 3) - 1;
buttons = (dbyte >> 4) & 3;
if (!(--DemoBuffer[DemoOffset]))
{
DemoOffset += 2;
if (DemoOffset >= DemoSize)
DemoMode = demo_PlayDone;
}
realdelta = false;
}
else if (DemoMode == demo_PlayDone)
Quit("Demo playback exceeded");
else
{
switch (type = Controls[player])
{
case ctrl_Keyboard:
def = &KbdDefs;
if (Keyboard[def->upleft])
mx = motion_Left,my = motion_Up;
else if (Keyboard[def->upright])
mx = motion_Right,my = motion_Up;
else if (Keyboard[def->downleft])
mx = motion_Left,my = motion_Down;
else if (Keyboard[def->downright])
mx = motion_Right,my = motion_Down;
if (Keyboard[def->up])
my = motion_Up;
else if (Keyboard[def->down])
my = motion_Down;
if (Keyboard[def->left])
mx = motion_Left;
else if (Keyboard[def->right])
mx = motion_Right;
if (Keyboard[def->button0])
buttons += 1 << 0;
if (Keyboard[def->button1])
buttons += 1 << 1;
realdelta = false;
break;
case ctrl_Joystick1:
case ctrl_Joystick2:
INL_GetJoyDelta(type - ctrl_Joystick,&dx,&dy);
buttons = INL_GetJoyButtons(type - ctrl_Joystick);
realdelta = true;
break;
case ctrl_Mouse:
INL_GetMouseDelta(&dx,&dy);
buttons = INL_GetMouseButtons();
realdelta = true;
break;
}
}
if (realdelta)
{
mx = (dx < 0)? motion_Left : ((dx > 0)? motion_Right : motion_None);
my = (dy < 0)? motion_Up : ((dy > 0)? motion_Down : motion_None);
}
else
{
dx = mx * 127;
dy = my * 127;
}
info->x = dx;
info->xaxis = mx;
info->y = dy;
info->yaxis = my;
info->button0 = buttons & (1 << 0);
info->button1 = buttons & (1 << 1);
info->button2 = buttons & (1 << 2);
info->button3 = buttons & (1 << 3);
info->dir = DirTable[((my + 1) * 3) + (mx + 1)];
if (DemoMode == demo_Record)
{
// Pack the control info into a byte
dbyte = (buttons << 4) | ((mx + 1) << 2) | (my + 1);
if
(
(DemoBuffer[DemoOffset + 1] == dbyte)
&& (DemoBuffer[DemoOffset] < 255)
)
(DemoBuffer[DemoOffset])++;
else
{
if (DemoOffset || DemoBuffer[DemoOffset])
DemoOffset += 2;
if (DemoOffset >= DemoSize)
Quit("Demo buffer overflow");
DemoBuffer[DemoOffset] = 1;
DemoBuffer[DemoOffset + 1] = dbyte;
}
}
}
///////////////////////////////////////////////////////////////////////////
//
// IN_SetControlType() - Sets the control type to be used by the specified
// player
//
///////////////////////////////////////////////////////////////////////////
void
IN_SetControlType(int player,ControlType type)
{
// DEBUG - check that requested type is present?
Controls[player] = type;
}
///////////////////////////////////////////////////////////////////////////
//
// IN_WaitForKey() - Waits for a scan code, then clears LastScan and
// returns the scan code
//
///////////////////////////////////////////////////////////////////////////
ScanCode
IN_WaitForKey(void)
{
ScanCode result;
while (!(result = LastScan))
;
LastScan = 0;
return(result);
}
///////////////////////////////////////////////////////////////////////////
//
// IN_WaitForASCII() - Waits for an ASCII char, then clears LastASCII and
// returns the ASCII value
//
///////////////////////////////////////////////////////////////////////////
char
IN_WaitForASCII(void)
{
char result;
while (!(result = LastASCII))
;
LastASCII = '\0';
return(result);
}
///////////////////////////////////////////////////////////////////////////
//
// IN_Ack() - waits for a button or key press. If a button is down, upon
// calling, it must be released for it to be recognized
//
///////////////////////////////////////////////////////////////////////////
boolean btnstate[8];
void IN_StartAck(void)
{
unsigned i,buttons;
//
// get initial state of everything
//
IN_ClearKeysDown();
memset (btnstate,0,sizeof(btnstate));
buttons = IN_JoyButtons () << 4;
if (MousePresent)
buttons |= IN_MouseButtons ();
for (i=0;i<8;i++,buttons>>=1)
if (buttons&1)
btnstate[i] = true;
}
boolean IN_CheckAck (void)
{
unsigned i,buttons;
//
// see if something has been pressed
//
if (LastScan)
return true;
buttons = IN_JoyButtons () << 4;
if (MousePresent)
buttons |= IN_MouseButtons ();
for (i=0;i<8;i++,buttons>>=1)
if ( buttons&1 )
{
if (!btnstate[i])
return true;
}
else
btnstate[i]=false;
return false;
}
void IN_Ack (void)
{
IN_StartAck ();
while (!IN_CheckAck ())
;
}
///////////////////////////////////////////////////////////////////////////
//
// IN_UserInput() - Waits for the specified delay time (in ticks) or the
// user pressing a key or a mouse button. If the clear flag is set, it
// then either clears the key or waits for the user to let the mouse
// button up.
//
///////////////////////////////////////////////////////////////////////////
boolean IN_UserInput(longword delay)
{
longword lasttime;
lasttime = TimeCount;
IN_StartAck ();
do
{
if (IN_CheckAck())
return true;
} while (TimeCount - lasttime < delay);
return(false);
}
//===========================================================================
/*
===================
=
= IN_MouseButtons
=
===================
*/
byte IN_MouseButtons (void)
{
if (MousePresent)
{
Mouse(MButtons);
return _BX;
}
else
return 0;
}
/*
===================
=
= IN_JoyButtons
=
===================
*/
byte IN_JoyButtons (void)
{
unsigned joybits;
joybits = inportb(0x201); // Get all the joystick buttons
joybits >>= 4; // only the high bits are useful
joybits ^= 15; // return with 1=pressed
return joybits;
}
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