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i_ibm.c
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i_ibm.c
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//
// Copyright (C) 1993-1996 Id Software, Inc.
// Copyright (C) 1993-2008 Raven Software
// Copyright (C) 2016-2017 Alexey Khokholov (Nuke.YKT)
//
// This program 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 2
// 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.
//
// DESCRIPTION:
// IBM DOS VGA graphics and key/mouse.
//
#include <string.h>
#include <dos.h>
#include <conio.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include "d_main.h"
#include "doomstat.h"
#include "r_local.h"
#include "sounds.h"
#include "i_system.h"
#include "i_sound.h"
#include "g_game.h"
#include "m_misc.h"
#include "v_video.h"
#include "w_wad.h"
#include "z_zone.h"
#include "ns_dpmi.h"
#include "ns_task.h"
#include "doomdef.h"
#include "doomstat.h"
#include "ns_inter.h"
#include "ns_cd.h"
#include "i_debug.h"
#include "am_map.h"
#include "std_func.h"
#include "options.h"
#include "math.h"
#if defined(MODE_CGA_AFH)
#include "i_cgaafh.h"
#endif
#if defined(MODE_CGA16)
#include "i_cga16.h"
#endif
#if defined(MODE_13H)
#include "i_vga.h"
#include "i_vga13h.h"
#endif
#if defined(MODE_PCP)
#include "i_pcp.h"
#endif
#if defined(MODE_SIGMA)
#include "i_sigma.h"
#endif
#if defined(MODE_CGA)
#include "i_cga4.h"
#endif
#if defined(MODE_CVB)
#include "i_cgacvb.h"
#endif
#if defined(MODE_HERC)
#include "i_herc.h"
#endif
#if defined(MODE_INCOLOR)
#include "i_incolor.h"
#endif
#if defined(MODE_CGA_BW)
#include "i_cgabw.h"
#endif
#if defined(MODE_EGA)
#include "i_ega320.h"
#endif
#if defined(MODE_VBE2)
#include "i_vga.h"
#endif
#if defined(MODE_Y)
#include "i_vgay.h"
#include "i_vga.h"
#endif
#if defined(MODE_Y_HALF)
#include "i_vgayh.h"
#include "i_vga.h"
#endif
#if defined(MODE_X)
#include "i_vgax.h"
#include "i_vga.h"
#endif
#if defined(MODE_VBE2_DIRECT)
#include "i_vga.h"
#endif
#if defined(MODE_CGA512)
#include "i_cga512.h"
#endif
#if defined(TEXT_MODE)
#include "i_text.h"
#endif
#if defined(MODE_VBE2) || defined(MODE_VBE2_DIRECT)
#include "i_vesa.h"
#endif
#if defined(MODE_MDA)
#include "i_mda.h"
#endif
//
// Macros
//
#define DPMI_INT 0x31
//
// Code
//
typedef struct
{
unsigned edi, esi, ebp, reserved, ebx, edx, ecx, eax;
unsigned short flags, es, ds, fs, gs, ip, cs, sp, ss;
} dpmiregs_t;
extern dpmiregs_t dpmiregs;
void I_ReadMouse(void);
extern int usemouse;
//
// Constants
//
#define SC_INDEX 0x3C4
#define SC_DATA 0x3C5
#define SC_RESET 0
#define SC_CLOCK 1
#define SC_MAPMASK 2
#define SC_CHARMAP 3
#define SC_MEMMODE 4
#define CRTC_INDEX 0x3D4
#define CRTC_DATA 0x3D5
#define CRTC_H_TOTAL 0
#define CRTC_H_DISPEND 1
#define CRTC_H_BLANK 2
#define CRTC_H_ENDBLANK 3
#define CRTC_H_RETRACE 4
#define CRTC_H_ENDRETRACE 5
#define CRTC_V_TOTAL 6
#define CRTC_OVERFLOW 7
#define CRTC_ROWSCAN 8
#define CRTC_MAXSCANLINE 9
#define CRTC_CURSORSTART 10
#define CRTC_CURSOREND 11
#define CRTC_STARTHIGH 12
#define CRTC_STARTLOW 13
#define CRTC_CURSORHIGH 14
#define CRTC_CURSORLOW 15
#define CRTC_V_RETRACE 16
#define CRTC_V_ENDRETRACE 17
#define CRTC_V_DISPEND 18
#define CRTC_OFFSET 19
#define CRTC_UNDERLINE 20
#define CRTC_V_BLANK 21
#define CRTC_V_ENDBLANK 22
#define CRTC_MODE 23
#define CRTC_LINECOMPARE 24
#define GC_INDEX 0x3CE
#define GC_DATA 0x3CF
#define GC_SETRESET 0
#define GC_ENABLESETRESET 1
#define GC_COLORCOMPARE 2
#define GC_DATAROTATE 3
#define GC_READMAP 4
#define GC_MODE 5
#define GC_MISCELLANEOUS 6
#define GC_COLORDONTCARE 7
#define GC_BITMASK 8
#define ATR_INDEX 0x3c0
#define ATR_MODE 16
#define ATR_OVERSCAN 17
#define ATR_COLORPLANEENABLE 18
#define ATR_PELPAN 19
#define ATR_COLORSELECT 20
#define STATUS_REGISTER_1 0x3da
#define PEL_WRITE_ADR 0x3c8
#define PEL_READ_ADR 0x3c7
#define PEL_DATA 0x3c9
#define PEL_MASK 0x3c6
#define SYNC_RESET 0
#define MAP_MASK 2
#define MEMORY_MODE 4
#define READ_MAP 4
#define GRAPHICS_MODE 5
#define MISCELLANOUS 6
#define MISC_OUTPUT 0x3C2
#define MAX_SCAN_LINE 9
#define UNDERLINE 0x14
#define MODE_CONTROL 0x17
#define VBLCOUNTER 34000 // hardware tics to a frame
#define TIMERINT 8
#define KEYBOARDINT 9
#define MOUSEB1 1
#define MOUSEB2 2
#define MOUSEB3 4
byte mousepresent;
unsigned int ticcount_hr;
unsigned int ticcount;
unsigned int fps;
// REGS stuff used for int calls
union REGS regs;
struct SREGS segregs;
#define KBDQUESIZE 32
byte keyboardque[KBDQUESIZE];
int kbdtail, kbdhead;
#define KEY_LSHIFT 0xfe
#define KEY_INS (0x80 + 0x52)
#define KEY_DEL (0x80 + 0x53)
#define KEY_PGUP (0x80 + 0x49)
#define KEY_PGDN (0x80 + 0x51)
#define KEY_HOME (0x80 + 0x47)
#define KEY_END (0x80 + 0x4f)
#define SC_RSHIFT 0x36
#define SC_LSHIFT 0x2a
void DPMIInt(int i);
void I_StartupSound(void);
void I_ShutdownSound(void);
void I_StartupTimer(void);
void I_ShutdownTimer(void);
//
// Graphics mode
//
#if defined(USE_BACKBUFFER)
int updatestate;
#endif
byte *pcscreen, *destscreen, *destview;
unsigned short *currentscreen;
//
// I_UpdateBox
//
#if defined(MODE_VBE2_DIRECT)
void I_UpdateBox(int x, int y, int w, int h)
{
byte *dest;
byte *source;
int i;
int offset = MulScreenWidth(y) + x;
dest = destscreen + offset;
source = screen0 + offset;
if (w & 1)
{
for (i = y; i < y + h; i++)
{
CopyBytes(source, dest, w);
dest += SCREENWIDTH;
source += SCREENWIDTH;
}
}
else
{
w /= 2;
for (i = y; i < y + h; i++)
{
CopyWords(source, dest, w);
dest += SCREENWIDTH;
source += SCREENWIDTH;
}
}
}
void I_UpdateBoxTransparent(int x, int y, int w, int h)
{
byte *dest;
byte *source;
int i;
int offset = MulScreenWidth(y) + x;
dest = destscreen + offset;
source = screen0 + offset;
for (i = y; i < y + h; i++)
{
for (x = 0; x < w; x++)
{
if (source[x] != 251)
{
dest[x] = source[x];
}
}
dest += SCREENWIDTH;
source += SCREENWIDTH;
}
}
#endif
#if defined(MODE_X) || defined(MODE_Y) || defined(MODE_Y_HALF)
void I_UpdateBox(int x, int y, int w, int h)
{
int i, j, k, count;
int sp_x1, sp_x2;
int poffset;
int offset;
int pstep;
int step;
byte *dest, *source;
sp_x1 = x / 8;
sp_x2 = (x + w) / 8;
count = sp_x2 - sp_x1 + 1;
step = SCREENWIDTH - count * 8;
offset = MulScreenWidth(y) + sp_x1 * 8;
poffset = offset / 4;
pstep = step / 4;
if (count & 1)
{
// 16-bit copy
count = 2 * count;
for (i = 0; i < 4; i++)
{
outp(SC_INDEX + 1, 1 << i);
source = &screen0[offset + i];
dest = destscreen + poffset;
for (j = 0; j < h; j++)
{
k = dest + count;
while (dest < k)
{
*(unsigned short *)dest = (unsigned short)((*source) + ((*(source + 4)) << 8));
dest += 2;
source += 8;
}
source += step;
dest += pstep;
}
}
}
else
{
// 32-bit copy
count = 2 * count;
for (i = 0; i < 4; i++)
{
outp(SC_INDEX + 1, 1 << i);
source = &screen0[offset + i];
dest = destscreen + poffset;
for (j = 0; j < h; j++)
{
k = dest + count;
while (dest < k)
{
*(unsigned int *)dest = (unsigned int)((*source) + ((*(source + 4)) << 8) + ((*(source + 8)) << 16) + ((*(source + 12)) << 24));
dest += 4;
source += 16;
}
source += step;
dest += pstep;
}
}
}
}
void I_UpdateBoxTransparent(int x, int y, int w, int h)
{
int i, j, k, count;
int sp_x1, sp_x2;
int poffset;
int offset;
int pstep;
int step;
byte *dest, *source;
sp_x1 = x / 8;
sp_x2 = (x + w) / 8;
count = sp_x2 - sp_x1 + 1;
step = SCREENWIDTH - count * 8;
offset = MulScreenWidth(y) + sp_x1 * 8;
poffset = offset / 4;
pstep = step / 4;
count *= 2;
for (i = 0; i < 4; i++)
{
outp(SC_INDEX + 1, 1 << i);
source = &screen0[offset + i];
dest = destscreen + poffset;
for (j = 0; j < h; j++)
{
k = dest + count;
while (dest < k)
{
if (*source != 251)
*dest = *source;
dest++;
source += 4;
}
source += step;
dest += pstep;
}
}
}
#endif
//
// I_UpdateNoBlit
//
#if defined(MODE_X) || defined(MODE_Y) || defined(MODE_Y_HALF) || defined(MODE_VBE2_DIRECT)
int olddb[2][4];
void I_UpdateNoBlit(void)
{
int realdr[4];
// Set current screen
currentscreen = (unsigned short *)destscreen;
// Update dirtybox size
realdr[BOXTOP] = dirtybox[BOXTOP];
if (realdr[BOXTOP] < olddb[0][BOXTOP])
{
realdr[BOXTOP] = olddb[0][BOXTOP];
}
if (realdr[BOXTOP] < olddb[1][BOXTOP])
{
realdr[BOXTOP] = olddb[1][BOXTOP];
}
realdr[BOXRIGHT] = dirtybox[BOXRIGHT];
if (realdr[BOXRIGHT] < olddb[0][BOXRIGHT])
{
realdr[BOXRIGHT] = olddb[0][BOXRIGHT];
}
if (realdr[BOXRIGHT] < olddb[1][BOXRIGHT])
{
realdr[BOXRIGHT] = olddb[1][BOXRIGHT];
}
realdr[BOXBOTTOM] = dirtybox[BOXBOTTOM];
if (realdr[BOXBOTTOM] > olddb[0][BOXBOTTOM])
{
realdr[BOXBOTTOM] = olddb[0][BOXBOTTOM];
}
if (realdr[BOXBOTTOM] > olddb[1][BOXBOTTOM])
{
realdr[BOXBOTTOM] = olddb[1][BOXBOTTOM];
}
realdr[BOXLEFT] = dirtybox[BOXLEFT];
if (realdr[BOXLEFT] > olddb[0][BOXLEFT])
{
realdr[BOXLEFT] = olddb[0][BOXLEFT];
}
if (realdr[BOXLEFT] > olddb[1][BOXLEFT])
{
realdr[BOXLEFT] = olddb[1][BOXLEFT];
}
// Leave current box for next update
// CopyDWords(olddb[1], olddb[0], 4);
// CopyDWords(dirtybox, olddb[1], 4);
// memcpy(olddb[0], olddb[1], 16);
// memcpy(olddb[1], dirtybox, 16);
olddb[0][0] = olddb[1][0];
olddb[0][1] = olddb[1][1];
olddb[0][2] = olddb[1][2];
olddb[0][3] = olddb[1][3];
olddb[1][0] = dirtybox[0];
olddb[1][1] = dirtybox[1];
olddb[1][2] = dirtybox[2];
olddb[1][3] = dirtybox[3];
// Update screen
if (realdr[BOXBOTTOM] <= realdr[BOXTOP])
{
int x, y, w, h;
x = realdr[BOXLEFT];
w = realdr[BOXRIGHT] - x + 1;
y = realdr[BOXBOTTOM];
h = realdr[BOXTOP] - y + 1;
if (transparentmap)
I_UpdateBoxTransparent(x, y, w, h);
else
I_UpdateBox(x, y, w, h);
}
// Clear box
dirtybox[BOXTOP] = dirtybox[BOXRIGHT] = MININT;
dirtybox[BOXBOTTOM] = dirtybox[BOXLEFT] = MAXINT;
}
#endif
//
// I_FinishUpdate
//
extern int screenblocks;
//#define SUB_FRAME_FPS
#define MAX_FPS 256 //must be power of 2
unsigned int fps_time[MAX_FPS];
unsigned int fps_head = 0;
unsigned int fps_tail = 0;
unsigned int fps_size = 0;
#ifdef SUB_FRAME_FPS
unsigned int fps_sum = 0;
#endif
void I_CalculateFPS(void)
{
unsigned int time, timer_rate;
if (uncappedFPS)
{
time = ticcount_hr;
timer_rate = 560;
}
else
{
time = ticcount;
timer_rate = 35;
}
//dequeue old items (older than 1 sec)
while ((fps_size > 0 && ((time - fps_time[fps_head]) >= timer_rate))
|| (fps_size >= MAX_FPS-1))
{
#ifdef SUB_FRAME_FPS
fps_sum -= fps_time[fps_head] - fps_time[(fps_head + MAX_FPS - 1) % MAX_FPS];
#endif
fps_head = (fps_head + 1) % MAX_FPS;
fps_size--;
}
//enqueue new item
#ifdef SUB_FRAME_FPS
fps_sum += time - fps_time[(fps_tail + MAX_FPS - 1) % MAX_FPS];
#endif
fps_time[fps_tail] = time;
fps_tail = (fps_tail + 1) % MAX_FPS;
fps_size++;
#ifdef SUB_FRAME_FPS
fps = fps_sum == 0 ? 0 : (timer_rate * fps_size) / fps_sum;
#else
fps = fps_size;
#endif
}
//
// I_InitGraphics
//
#ifdef SUPPORTS_HERCULES_AUTOMAP
void I_InitHerculesHalfMode(void)
{
byte Graph_640x400[12] = {0x03, 0x34, 0x28, 0x2A, 0x47, 0x69, 0x00, 0x64, 0x65, 0x02, 0x03, 0x0A};
int i;
outp(0x03BF, Graph_640x400[0]);
for (i = 0; i < 10; i++)
{
outp(0x03B4, i);
outp(0x03B5, Graph_640x400[i + 1]);
}
outp(0x03B8, Graph_640x400[11]);
SetDWords((byte *)0xB0000, 0, 8192);
}
void I_FinishHerculesHalfMode(void)
{
byte Text_80x25[12] = {0x00, 0x61, 0x50, 0x52, 0x0F, 0x19, 0x06, 0x19, 0x19, 0x02, 0x0D, 0x08};
int i;
outp(0x03BF, Text_80x25[0]);
for (i = 0; i < 10; i++)
{
outp(0x03B4, i);
outp(0x03B5, Text_80x25[i + 1]);
}
outp(0x03B8, Text_80x25[11]);
SetDWords((byte *)0xB0000, 0, 8192);
}
#endif
void I_InitGraphics(void)
{
#ifdef SUPPORTS_HERCULES_AUTOMAP
if (HERCmap)
I_InitHerculesHalfMode();
#endif
#if defined(MODE_CGA_AFH)
CGA_AFH_InitGraphics();
#endif
#if defined(MODE_CGA16)
CGA_16_InitGraphics();
#endif
#if defined(MODE_T4025) || defined(MODE_T4050)
TEXT_40x25_InitGraphics();
#endif
#if defined(MODE_T8025)
TEXT_80x25_InitGraphics();
#endif
#if defined(MODE_T8050) || defined(MODE_T8043)
TEXT_80x25_Double_InitGraphics();
#endif
#if defined(MODE_MDA)
MDA_InitGraphics();
#endif
#if defined(MODE_Y)
VGA_Y_InitGraphics();
#endif
#if defined(MODE_Y_HALF)
VGA_Y_Half_InitGraphics();
#endif
#if defined(MODE_X)
VGA_X_InitGraphics();
#endif
#if defined(MODE_13H)
VGA_13H_InitGraphics();
#endif
#if defined(MODE_CGA)
CGA_InitGraphics();
#endif
#if defined(MODE_CGA512)
CGA_512_InitGraphics();
#endif
#if defined(MODE_CGA_BW)
CGA_BW_InitGraphics();
#endif
#if defined(MODE_PCP)
PCP_InitGraphics();
#endif
#if defined(MODE_SIGMA)
Sigma_InitGraphics();
#endif
#if defined(MODE_EGA)
EGA_InitGraphics();
#endif
#if defined(MODE_CVB)
CGA_CVBS_InitGraphics();
#endif
#if defined(MODE_HERC)
HERC_InitGraphics();
#endif
#if defined(MODE_INCOLOR)
InColor_InitGraphics();
#endif
#if defined(MODE_VBE2) || defined(MODE_VBE2_DIRECT)
VBE2_InitGraphics();
#endif
#if defined(MODE_13H) || defined(MODE_VBE2) || defined(MODE_X) || defined(MODE_Y) || defined(MODE_Y_HALF) || defined(MODE_VBE2_DIRECT)
VGA_TestFastSetPalette();
#endif
I_ProcessPalette(W_CacheLumpName("PLAYPAL", PU_CACHE));
I_SetPalette(0);
}
//
// I_ShutdownGraphics
//
void I_ShutdownGraphics(void)
{
#if defined(MODE_HERC)
HERC_ShutdownGraphics();
#endif
#if defined(MODE_INCOLOR)
InColor_ShutdownGraphics();
#endif
#if defined(MODE_VBE2) || defined(MODE_VBE2_DIRECT)
VBE_Done();
#endif
#ifdef SUPPORTS_HERCULES_AUTOMAP
if (HERCmap)
I_FinishHerculesHalfMode();
#endif
regs.w.ax = 3;
int386(0x10, ®s, ®s); // back to text mode
}
//
// I_StartTic
//
// called by D_DoomLoop
// called before processing each tic in a frame
// can call D_PostEvent
// asyncronous interrupt functions should maintain private ques that are
// read by the syncronous functions to be converted into events
//
#define SC_UPARROW 0x48
#define SC_DOWNARROW 0x50
#define SC_LEFTARROW 0x4b
#define SC_RIGHTARROW 0x4d
byte scantokey[128] =
{
// 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', '-', '=', KEY_BACKSPACE, 9, // 0
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
'o', 'p', '[', ']', 13, KEY_RCTRL, 'a', 's', // 1
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
39, '`', KEY_LSHIFT, 92, 'z', 'x', 'c', 'v', // 2
'b', 'n', 'm', ',', '.', '/', KEY_RSHIFT, '*',
KEY_RALT, ' ', 0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, // 3
KEY_F6, KEY_F7, KEY_F8, KEY_F9, KEY_F10, 0, 0, KEY_HOME,
KEY_UPARROW, KEY_PGUP, '-', KEY_LEFTARROW, '5', KEY_RIGHTARROW, '+', KEY_END, // 4
KEY_DOWNARROW, KEY_PGDN, KEY_INS, KEY_DEL, 0, 0, 0, KEY_F11,
KEY_F12, 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
};
void I_StartTic(void)
{
int k;
event_t ev;
if (mousepresent)
I_ReadMouse();
//
// keyboard events
//
while (kbdtail < kbdhead)
{
k = keyboardque[kbdtail & (KBDQUESIZE - 1)];
kbdtail++;
// extended keyboard shift key bullshit
if ((k & 0x7f) == SC_LSHIFT || (k & 0x7f) == SC_RSHIFT)
{
if (keyboardque[(kbdtail - 2) & (KBDQUESIZE - 1)] == 0xe0)
{
continue;
}
k &= 0x80;
k |= SC_RSHIFT;
}
if (k == 0xe0 || keyboardque[(kbdtail - 2) & (KBDQUESIZE - 1)] == 0xe1)
{
continue; // special / pause keys, pause key bullshit
}
if (k == 0xc5 && keyboardque[(kbdtail - 2) & (KBDQUESIZE - 1)] == 0x9d)
{
ev.type = ev_keydown;
ev.data1 = KEY_PAUSE;
D_PostEvent(&ev);
continue;
}
ev.type = (k & 0x80) != 0;
k &= 0x7f;
ev.data1 = scantokey[k];
D_PostEvent(&ev);
}
}
//
// Timer interrupt
//
//
// I_TimerISR
//
void I_TimerHrISR(task *task)
{
// 560 HZ
ticcount_hr++;
// 35 HZ
ticcount = ticcount_hr >> 4;
}
void I_TimerISR(task *task)
{
ticcount++;
}
//
// I_StartupTimer
//
task *tsm_task = NULL;
void I_ShutdownTimer(void)
{
if (tsm_task) {
TS_Terminate(tsm_task);
}
tsm_task = NULL;
TS_Shutdown();
}
int currentTimer = -1;
void I_SetHrTimerEnabled(int enabled) {
if (currentTimer == enabled)
return;
currentTimer = enabled;
if (tsm_task) {
TS_Terminate(tsm_task);
}
if (enabled) {
// Move the ticcount for consistency
ticcount_hr = ticcount << 4;
tsm_task = TS_ScheduleTask(I_TimerHrISR, 560, 1, NULL);
}
else {
tsm_task = TS_ScheduleTask(I_TimerISR, 35, 1, NULL);
}
TS_Dispatch();
}
void I_StartupTimer(void) {
I_SetHrTimerEnabled(false);
}
//
// Keyboard
//
void(__interrupt __far *oldkeyboardisr)() = NULL;
//
// I_KeyboardISR
//
void __interrupt I_KeyboardISR(void)
{
// Get the scan code
keyboardque[kbdhead & (KBDQUESIZE - 1)] = InByte60h();
kbdhead++;
// acknowledge the interrupt
OutByte20h(0x20);
}
//
// I_StartupKeyboard
//
void I_StartupKeyboard(void)
{
oldkeyboardisr = _dos_getvect(KEYBOARDINT);
_dos_setvect(0x8000 | KEYBOARDINT, I_KeyboardISR);
}
void I_ShutdownKeyboard(void)
{
if (oldkeyboardisr)
_dos_setvect(KEYBOARDINT, oldkeyboardisr);
*(short *)0x41c = *(short *)0x41a; // clear bios key buffer
}
//
// Mouse
//
int I_ResetMouse(void)
{
regs.w.ax = 0; // reset
int386(0x33, ®s, ®s);
return regs.w.ax;
}
//
// StartupMouse
//
void I_StartupMouse(void)
{
//
// General mouse detection
//
mousepresent = 0;
if (M_CheckParm("-nomouse") || !usemouse)
{
return;
}
if (I_ResetMouse() != 0xffff)
{
printf("Mouse: not present\n", 0);