/*
Copyright (C) 1996-1997 Id Software, Inc.

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.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// vid_x.c -- general x video driver

#define _BSD


#include <ctype.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#include <X11/extensions/XShm.h>

#include "quakedef.h"
#include "d_local.h"

cvar_t    _windowed_mouse = {"_windowed_mouse","0", true};
cvar_t    m_filter = {"m_filter","0", true};
float old_windowed_mouse;

qboolean        mouse_avail;
int             mouse_buttons=3;
int             mouse_oldbuttonstate;
int             mouse_buttonstate;
float   mouse_x, mouse_y;
float   old_mouse_x, old_mouse_y;
int p_mouse_x;
int p_mouse_y;
int ignorenext;
int bits_per_pixel;

typedef struct
{
  int input;
  int output;
} keymap_t;

viddef_t vid; // global video state
unsigned short d_8to16table[256];

int   num_shades=32;

int d_con_indirect = 0;

int   vid_buffersize;

static qboolean     doShm;
static Display      *x_disp;
static Colormap     x_cmap;
static Window     x_win;
static GC       x_gc;
static Visual     *x_vis;
static XVisualInfo    *x_visinfo;
//static XImage     *x_image;

static int        x_shmeventtype;
//static XShmSegmentInfo  x_shminfo;

static qboolean     oktodraw = false;

int XShmQueryExtension(Display *);
int XShmGetEventBase(Display *);

int current_framebuffer;
static XImage     *x_framebuffer[2] = { 0, 0 };
static XShmSegmentInfo  x_shminfo[2];

static int verbose=0;

static byte current_palette[768];

static long X11_highhunkmark;
static long X11_buffersize;

int vid_surfcachesize;
void *vid_surfcache;

void (*vid_menudrawfn)(void);
void (*vid_menukeyfn)(int key);
void VID_MenuKey (int key);

typedef unsigned short PIXEL16;
typedef unsigned long PIXEL24;
static PIXEL16 st2d_8to16table[256];
static PIXEL24 st2d_8to24table[256];
static int shiftmask_fl=0;
static long r_shift,g_shift,b_shift;
static unsigned long r_mask,g_mask,b_mask;

void shiftmask_init()
{
    unsigned int x;
    r_mask=x_vis->red_mask;
    g_mask=x_vis->green_mask;
    b_mask=x_vis->blue_mask;
    for(r_shift=-8,x=1;x<r_mask;x=x<<1)r_shift++;
    for(g_shift=-8,x=1;x<g_mask;x=x<<1)g_shift++;
    for(b_shift=-8,x=1;x<b_mask;x=x<<1)b_shift++;
    shiftmask_fl=1;
}

PIXEL16 xlib_rgb16(int r,int g,int b)
{
    PIXEL16 p;
    if(shiftmask_fl==0) shiftmask_init();
    p=0;

    if(r_shift>0) {
        p=(r<<(r_shift))&r_mask;
    } else if(r_shift<0) {
        p=(r>>(-r_shift))&r_mask;
    } else p|=(r&r_mask);

    if(g_shift>0) {
        p|=(g<<(g_shift))&g_mask;
    } else if(g_shift<0) {
        p|=(g>>(-g_shift))&g_mask;
    } else p|=(g&g_mask);

    if(b_shift>0) {
        p|=(b<<(b_shift))&b_mask;
    } else if(b_shift<0) {
        p|=(b>>(-b_shift))&b_mask;
    } else p|=(b&b_mask);

    return p;
}

PIXEL24 xlib_rgb24(int r,int g,int b)
{
    PIXEL24 p;
    if(shiftmask_fl==0) shiftmask_init();
    p=0;

    if(r_shift>0) {
        p=(r<<(r_shift))&r_mask;
    } else if(r_shift<0) {
        p=(r>>(-r_shift))&r_mask;
    } else p|=(r&r_mask);

    if(g_shift>0) {
        p|=(g<<(g_shift))&g_mask;
    } else if(g_shift<0) {
        p|=(g>>(-g_shift))&g_mask;
    } else p|=(g&g_mask);

    if(b_shift>0) {
        p|=(b<<(b_shift))&b_mask;
    } else if(b_shift<0) {
        p|=(b>>(-b_shift))&b_mask;
    } else p|=(b&b_mask);

    return p;
}

void st2_fixup( XImage *framebuf, int x, int y, int width, int height)
{
  int xi,yi;
  unsigned char *src;
  PIXEL16 *dest;
  register int count, n;

  if( (x<0)||(y<0) )return;

  for (yi = y; yi < (y+height); yi++) {
    src = &framebuf->data [yi * framebuf->bytes_per_line];

    // Duff's Device
    count = width;
    n = (count + 7) / 8;
    dest = ((PIXEL16 *)src) + x+width - 1;
    src += x+width - 1;

    switch (count % 8) {
    case 0: do {  *dest-- = st2d_8to16table[*src--];
    case 7:     *dest-- = st2d_8to16table[*src--];
    case 6:     *dest-- = st2d_8to16table[*src--];
    case 5:     *dest-- = st2d_8to16table[*src--];
    case 4:     *dest-- = st2d_8to16table[*src--];
    case 3:     *dest-- = st2d_8to16table[*src--];
    case 2:     *dest-- = st2d_8to16table[*src--];
    case 1:     *dest-- = st2d_8to16table[*src--];
        } while (--n > 0);
    }

//    for(xi = (x+width-1); xi >= x; xi--) {
//      dest[xi] = st2d_8to16table[src[xi]];
//    }
  }
}

void st3_fixup( XImage *framebuf, int x, int y, int width, int height)
{
  int xi,yi;
  unsigned char *src;
  PIXEL24 *dest;
  register int count, n;

  if( (x<0)||(y<0) )return;

  for (yi = y; yi < (y+height); yi++) {
    src = &framebuf->data [yi * framebuf->bytes_per_line];

    // Duff's Device
    count = width;
    n = (count + 7) / 8;
    dest = ((PIXEL24 *)src) + x+width - 1;
    src += x+width - 1;

    switch (count % 8) {
    case 0: do {  *dest-- = st2d_8to24table[*src--];
    case 7:     *dest-- = st2d_8to24table[*src--];
    case 6:     *dest-- = st2d_8to24table[*src--];
    case 5:     *dest-- = st2d_8to24table[*src--];
    case 4:     *dest-- = st2d_8to24table[*src--];
    case 3:     *dest-- = st2d_8to24table[*src--];
    case 2:     *dest-- = st2d_8to24table[*src--];
    case 1:     *dest-- = st2d_8to24table[*src--];
        } while (--n > 0);
    }

//    for(xi = (x+width-1); xi >= x; xi--) {
//      dest[xi] = st2d_8to16table[src[xi]];
//    }
  }
}


// ========================================================================
// Tragic death handler
// ========================================================================

void TragicDeath(int signal_num)
{
  XAutoRepeatOn(x_disp);
  XCloseDisplay(x_disp);
  Sys_Error("This death brought to you by the number %d\n", signal_num);
}

// ========================================================================
// makes a null cursor
// ========================================================================

static Cursor CreateNullCursor(Display *display, Window root)
{
    Pixmap cursormask; 
    XGCValues xgc;
    GC gc;
    XColor dummycolour;
    Cursor cursor;

    cursormask = XCreatePixmap(display, root, 1, 1, 1/*depth*/);
    xgc.function = GXclear;
    gc =  XCreateGC(display, cursormask, GCFunction, &xgc);
    XFillRectangle(display, cursormask, gc, 0, 0, 1, 1);
    dummycolour.pixel = 0;
    dummycolour.red = 0;
    dummycolour.flags = 04;
    cursor = XCreatePixmapCursor(display, cursormask, cursormask,
          &dummycolour,&dummycolour, 0,0);
    XFreePixmap(display,cursormask);
    XFreeGC(display,gc);
    return cursor;
}

void ResetFrameBuffer(void)
{
  int mem;
  int pwidth;

  if (x_framebuffer[0])
  {
    free(x_framebuffer[0]->data);
    free(x_framebuffer[0]);
  }

  if (d_pzbuffer)
  {
    D_FlushCaches ();
    Hunk_FreeToHighMark (X11_highhunkmark);
    d_pzbuffer = NULL;
  }
  X11_highhunkmark = Hunk_HighMark ();

// alloc an extra line in case we want to wrap, and allocate the z-buffer
  X11_buffersize = vid.width * vid.height * sizeof (*d_pzbuffer);

  vid_surfcachesize = D_SurfaceCacheForRes (vid.width, vid.height);

  X11_buffersize += vid_surfcachesize;

  d_pzbuffer = Hunk_HighAllocName (X11_buffersize, "video");
  if (d_pzbuffer == NULL)
    Sys_Error ("Not enough memory for video mode\n");

  vid_surfcache = (byte *) d_pzbuffer
    + vid.width * vid.height * sizeof (*d_pzbuffer);

  D_InitCaches(vid_surfcache, vid_surfcachesize);

  pwidth = x_visinfo->depth / 8;
  if (pwidth == 3) pwidth = 4;
  mem = ((vid.width*pwidth+7)&~7) * vid.height;

  x_framebuffer[0] = XCreateImage(  x_disp,
    x_vis,
    x_visinfo->depth,
    ZPixmap,
    0,
    malloc(mem),
    vid.width, vid.height,
    32,
    0);

  if (!x_framebuffer[0])
    Sys_Error("VID: XCreateImage failed\n");

  vid.buffer = (byte*) (x_framebuffer[0]);
  vid.conbuffer = vid.buffer;

}

void ResetSharedFrameBuffers(void)
{

  int size;
  int key;
  int minsize = getpagesize();
  int frm;

  if (d_pzbuffer)
  {
    D_FlushCaches ();
    Hunk_FreeToHighMark (X11_highhunkmark);
    d_pzbuffer = NULL;
  }

  X11_highhunkmark = Hunk_HighMark ();

// alloc an extra line in case we want to wrap, and allocate the z-buffer
  X11_buffersize = vid.width * vid.height * sizeof (*d_pzbuffer);

  vid_surfcachesize = D_SurfaceCacheForRes (vid.width, vid.height);

  X11_buffersize += vid_surfcachesize;

  d_pzbuffer = Hunk_HighAllocName (X11_buffersize, "video");
  if (d_pzbuffer == NULL)
    Sys_Error ("Not enough memory for video mode\n");

  vid_surfcache = (byte *) d_pzbuffer
    + vid.width * vid.height * sizeof (*d_pzbuffer);

  D_InitCaches(vid_surfcache, vid_surfcachesize);

  for (frm=0 ; frm<2 ; frm++)
  {

  // free up old frame buffer memory

    if (x_framebuffer[frm])
    {
      XShmDetach(x_disp, &x_shminfo[frm]);
      free(x_framebuffer[frm]);
      shmdt(x_shminfo[frm].shmaddr);
    }

  // create the image

    x_framebuffer[frm] = XShmCreateImage( x_disp,
            x_vis,
            x_visinfo->depth,
            ZPixmap,
            0,
            &x_shminfo[frm],
            vid.width,
            vid.height );

  // grab shared memory

    size = x_framebuffer[frm]->bytes_per_line
      * x_framebuffer[frm]->height;
    if (size < minsize)
      Sys_Error("VID: Window must use at least %d bytes\n", minsize);

    key = random();
    x_shminfo[frm].shmid = shmget((key_t)key, size, IPC_CREAT|0777);
    if (x_shminfo[frm].shmid==-1)
      Sys_Error("VID: Could not get any shared memory\n");

    // attach to the shared memory segment
    x_shminfo[frm].shmaddr =
      (void *) shmat(x_shminfo[frm].shmid, 0, 0);

    printf("VID: shared memory id=%d, addr=0x%lx\n", x_shminfo[frm].shmid,
      (long) x_shminfo[frm].shmaddr);

    x_framebuffer[frm]->data = x_shminfo[frm].shmaddr;

  // get the X server to attach to it

    if (!XShmAttach(x_disp, &x_shminfo[frm]))
      Sys_Error("VID: XShmAttach() failed\n");
    XSync(x_disp, 0);
    shmctl(x_shminfo[frm].shmid, IPC_RMID, 0);

  }

}

// Called at startup to set up translation tables, takes 256 8 bit RGB values
// the palette data will go away after the call, so it must be copied off if
// the video driver will need it again

void  VID_Init (unsigned char *palette)
{

   int pnum, i;
   XVisualInfo template;
   int num_visuals;
   int template_mask;
   
   ignorenext=0;
   vid.width = 320;
   vid.height = 200;
   vid.maxwarpwidth = WARP_WIDTH;
   vid.maxwarpheight = WARP_HEIGHT;
   vid.numpages = 2;
   vid.colormap = host_colormap;
   // vid.cbits = VID_CBITS;
   // vid.grades = VID_GRADES;
   vid.fullbright = 256 - LittleLong (*((int *)vid.colormap + 2048));
   
  srandom(getpid());

  verbose=COM_CheckParm("-verbose");

// open the display
  x_disp = XOpenDisplay(0);
  if (!x_disp)
  {
    if (getenv("DISPLAY"))
      Sys_Error("VID: Could not open display [%s]\n",
        getenv("DISPLAY"));
    else
      Sys_Error("VID: Could not open local display\n");
  }

// catch signals so i can turn on auto-repeat

  {
    struct sigaction sa;
    sigaction(SIGINT, 0, &sa);
    sa.sa_handler = TragicDeath;
    sigaction(SIGINT, &sa, 0);
    sigaction(SIGTERM, &sa, 0);
  }

  XAutoRepeatOff(x_disp);

// for debugging only
  XSynchronize(x_disp, True);

// check for command-line window size
  if ((pnum=COM_CheckParm("-winsize")))
  {
    if (pnum >= com_argc-2)
      Sys_Error("VID: -winsize <width> <height>\n");
    vid.width = Q_atoi(com_argv[pnum+1]);
    vid.height = Q_atoi(com_argv[pnum+2]);
    if (!vid.width || !vid.height)
      Sys_Error("VID: Bad window width/height\n");
  }
  if ((pnum=COM_CheckParm("-width"))) {
    if (pnum >= com_argc-1)
      Sys_Error("VID: -width <width>\n");
    vid.width = Q_atoi(com_argv[pnum+1]);
    if (!vid.width)
      Sys_Error("VID: Bad window width\n");
  }
  if ((pnum=COM_CheckParm("-height"))) {
    if (pnum >= com_argc-1)
      Sys_Error("VID: -height <height>\n");
    vid.height = Q_atoi(com_argv[pnum+1]);
    if (!vid.height)
      Sys_Error("VID: Bad window height\n");
  }

  template_mask = 0;

// specify a visual id
  if ((pnum=COM_CheckParm("-visualid")))
  {
    if (pnum >= com_argc-1)
      Sys_Error("VID: -visualid <id#>\n");
    template.visualid = Q_atoi(com_argv[pnum+1]);
    template_mask = VisualIDMask;
  }

// If not specified, use default visual
  else
  {
    int screen;
    screen = XDefaultScreen(x_disp);
    template.visualid =
      XVisualIDFromVisual(XDefaultVisual(x_disp, screen));
    template_mask = VisualIDMask;
  }

// pick a visual- warn if more than one was available
  x_visinfo = XGetVisualInfo(x_disp, template_mask, &template, &num_visuals);
  if (num_visuals > 1)
  {
    printf("Found more than one visual id at depth %d:\n", template.depth);
    for (i=0 ; i<num_visuals ; i++)
      printf("  -visualid %d\n", (int)(x_visinfo[i].visualid));
  }
  else if (num_visuals == 0)
  {
    if (template_mask == VisualIDMask)
      Sys_Error("VID: Bad visual id %d\n", template.visualid);
    else
      Sys_Error("VID: No visuals at depth %d\n", template.depth);
  }

  if (verbose)
  {
    printf("Using visualid %d:\n", (int)(x_visinfo->visualid));
    printf("  screen %d\n", x_visinfo->screen);
    printf("  red_mask 0x%x\n", (int)(x_visinfo->red_mask));
    printf("  green_mask 0x%x\n", (int)(x_visinfo->green_mask));
    printf("  blue_mask 0x%x\n", (int)(x_visinfo->blue_mask));
    printf("  colormap_size %d\n", x_visinfo->colormap_size);
    printf("  bits_per_rgb %d\n", x_visinfo->bits_per_rgb);
  }

  x_vis = x_visinfo->visual;

// setup attributes for main window
  {
     int attribmask = CWEventMask  | CWColormap | CWBorderPixel;
     XSetWindowAttributes attribs;
     Colormap tmpcmap;
     
     tmpcmap = XCreateColormap(x_disp, XRootWindow(x_disp,
               x_visinfo->screen), x_vis, AllocNone);
     
           attribs.event_mask = StructureNotifyMask | KeyPressMask
       | KeyReleaseMask | ExposureMask | PointerMotionMask |
       ButtonPressMask | ButtonReleaseMask;
     attribs.border_pixel = 0;
     attribs.colormap = tmpcmap;

// create the main window
    x_win = XCreateWindow(  x_disp,
      XRootWindow(x_disp, x_visinfo->screen),
      0, 0, // x, y
      vid.width, vid.height,
      0, // borderwidth
      x_visinfo->depth,
      InputOutput,
      x_vis,
      attribmask,
      &attribs );
    XStoreName( x_disp,x_win,"xquake");


    if (x_visinfo->class != TrueColor)
      XFreeColormap(x_disp, tmpcmap);
  }

  if (x_visinfo->depth == 8)
  {
    // create and upload the palette
    if (x_visinfo->class == PseudoColor)
    {
      x_cmap = XCreateColormap(x_disp, x_win, x_vis, AllocAll);
      VID_SetPalette(palette);
      XSetWindowColormap(x_disp, x_win, x_cmap);
    }
  }

// inviso cursor
  XDefineCursor(x_disp, x_win, CreateNullCursor(x_disp, x_win));

// create the GC
  {
    XGCValues xgcvalues;
    int valuemask = GCGraphicsExposures;
    xgcvalues.graphics_exposures = False;
    x_gc = XCreateGC(x_disp, x_win, valuemask, &xgcvalues );
  }

// map the window
  XMapWindow(x_disp, x_win);

// wait for first exposure event
  {
    XEvent event;
    do
    {
      XNextEvent(x_disp, &event);
      if (event.type == Expose && !event.xexpose.count)
        oktodraw = true;
    } while (!oktodraw);
  }
// now safe to draw

// even if MITSHM is available, make sure it's a local connection
  if (XShmQueryExtension(x_disp))
  {
    char *displayname;
    doShm = true;
    displayname = (char *) getenv("DISPLAY");
    if (displayname)
    {
      char *d = displayname;
      while (*d && (*d != ':')) d++;
      if (*d) *d = 0;
      if (!(!strcasecmp(displayname, "unix") || !*displayname))
        doShm = false;
    }
  }

  if (doShm)
  {
    x_shmeventtype = XShmGetEventBase(x_disp) + ShmCompletion;
    ResetSharedFrameBuffers();
  }
  else
    ResetFrameBuffer();

  current_framebuffer = 0;
  vid.rowbytes = x_framebuffer[0]->bytes_per_line;
  vid.buffer = x_framebuffer[0]->data;
  vid.direct = 0;
  vid.conbuffer = x_framebuffer[0]->data;
  vid.conrowbytes = vid.rowbytes;
  vid.conwidth = vid.width;
  vid.conheight = vid.height;
  vid.aspect = ((float)vid.height / (float)vid.width) * (320.0 / 240.0);

//  XSynchronize(x_disp, False);

}

void VID_ShiftPalette(unsigned char *p)
{
  VID_SetPalette(p);
}



void VID_SetPalette(unsigned char *palette)
{

  int i;
  XColor colors[256];

  for(i=0;i<256;i++) {
    st2d_8to16table[i]= xlib_rgb16(palette[i*3], palette[i*3+1],palette[i*3+2]);
    st2d_8to24table[i]= xlib_rgb24(palette[i*3], palette[i*3+1],palette[i*3+2]);
  }

  if (x_visinfo->class == PseudoColor && x_visinfo->depth == 8)
  {
    if (palette != current_palette)
      memcpy(current_palette, palette, 768);
    for (i=0 ; i<256 ; i++)
    {
      colors[i].pixel = i;
      colors[i].flags = DoRed|DoGreen|DoBlue;
      colors[i].red = palette[i*3] * 257;
      colors[i].green = palette[i*3+1] * 257;
      colors[i].blue = palette[i*3+2] * 257;
    }
    XStoreColors(x_disp, x_cmap, colors, 256);
  }

}

// Called at shutdown

void  VID_Shutdown (void)
{
  Con_Printf("VID_Shutdown\n");
  XAutoRepeatOn(x_disp);
  XCloseDisplay(x_disp);
}

int XLateKey(XKeyEvent *ev)
{

  int key;
  char buf[64];
  KeySym keysym;

  key = 0;

  XLookupString(ev, buf, sizeof buf, &keysym, 0);

  switch(keysym)
  {
    case XK_KP_Page_Up:
    case XK_Page_Up:   key = K_PGUP; break;

    case XK_KP_Page_Down:
    case XK_Page_Down:   key = K_PGDN; break;

    case XK_KP_Home:
    case XK_Home:  key = K_HOME; break;

    case XK_KP_End:
    case XK_End:   key = K_END; break;

    case XK_KP_Left:
    case XK_Left:  key = K_LEFTARROW; break;

    case XK_KP_Right:
    case XK_Right:  key = K_RIGHTARROW;   break;

    case XK_KP_Down:
    case XK_Down:  key = K_DOWNARROW; break;

    case XK_KP_Up:
    case XK_Up:    key = K_UPARROW;  break;

    case XK_Escape: key = K_ESCAPE;   break;

    case XK_KP_Enter:
    case XK_Return: key = K_ENTER;     break;

    case XK_Tab:    key = K_TAB;       break;

    case XK_F1:    key = K_F1;        break;

    case XK_F2:    key = K_F2;        break;

    case XK_F3:    key = K_F3;        break;

    case XK_F4:    key = K_F4;        break;

    case XK_F5:    key = K_F5;        break;

    case XK_F6:    key = K_F6;        break;

    case XK_F7:    key = K_F7;        break;

    case XK_F8:    key = K_F8;        break;

    case XK_F9:    key = K_F9;        break;

    case XK_F10:    key = K_F10;       break;

    case XK_F11:    key = K_F11;       break;

    case XK_F12:    key = K_F12;       break;

    case XK_BackSpace: key = K_BACKSPACE; break;

    case XK_KP_Delete:
    case XK_Delete: key = K_DEL; break;

    case XK_Pause:  key = K_PAUSE;     break;

    case XK_Shift_L:
    case XK_Shift_R:  key = K_SHIFT;    break;

    case XK_Execute: 
    case XK_Control_L: 
    case XK_Control_R:  key = K_CTRL;    break;

    case XK_Alt_L:  
    case XK_Meta_L: 
    case XK_Alt_R:  
    case XK_Meta_R: key = K_ALT;      break;

    case XK_KP_Begin: key = K_AUX30;  break;

    case XK_Insert:
    case XK_KP_Insert: key = K_INS; break;

    case XK_KP_Multiply: key = '*'; break;
    case XK_KP_Add: key = '+'; break;
    case XK_KP_Subtract: key = '-'; break;
    case XK_KP_Divide: key = '/'; break;

#if 0
    case 0x021: key = '1';break;/* [!] */
    case 0x040: key = '2';break;/* [@] */
    case 0x023: key = '3';break;/* [#] */
    case 0x024: key = '4';break;/* [$] */
    case 0x025: key = '5';break;/* [%] */
    case 0x05e: key = '6';break;/* [^] */
    case 0x026: key = '7';break;/* [&] */
    case 0x02a: key = '8';break;/* [*] */
    case 0x028: key = '9';;break;/* [(] */
    case 0x029: key = '0';break;/* [)] */
    case 0x05f: key = '-';break;/* [_] */
    case 0x02b: key = '=';break;/* [+] */
    case 0x07c: key = '\'';break;/* [|] */
    case 0x07d: key = '[';break;/* [}] */
    case 0x07b: key = ']';break;/* [{] */
    case 0x022: key = '\'';break;/* ["] */
    case 0x03a: key = ';';break;/* [:] */
    case 0x03f: key = '/';break;/* [?] */
    case 0x03e: key = '.';break;/* [>] */
    case 0x03c: key = ',';break;/* [<] */
#endif

    default:
      key = *(unsigned char*)buf;
      if (key >= 'A' && key <= 'Z')
        key = key - 'A' + 'a';
//      fprintf(stdout, "case 0x0%x: key = ___;break;/* [%c] */\n", keysym);
      break;
  } 

  return key;
}

struct
{
  int key;
  int down;
} keyq[64];
int keyq_head=0;
int keyq_tail=0;

int config_notify=0;
int config_notify_width;
int config_notify_height;
                  
void GetEvent(void)
{
  XEvent x_event;
  int b;
   
  XNextEvent(x_disp, &x_event);
  switch(x_event.type) {
  case KeyPress:
    keyq[keyq_head].key = XLateKey(&x_event.xkey);
    keyq[keyq_head].down = true;
    keyq_head = (keyq_head + 1) & 63;
    break;
  case KeyRelease:
    keyq[keyq_head].key = XLateKey(&x_event.xkey);
    keyq[keyq_head].down = false;
    keyq_head = (keyq_head + 1) & 63;
    break;

  case MotionNotify:
    if (_windowed_mouse.value) {
      mouse_x = (float) ((int)x_event.xmotion.x - (int)(vid.width/2));
      mouse_y = (float) ((int)x_event.xmotion.y - (int)(vid.height/2));
//printf("m: x=%d,y=%d, mx=%3.2f,my=%3.2f\n", 
//  x_event.xmotion.x, x_event.xmotion.y, mouse_x, mouse_y);

      /* move the mouse to the window center again */
      XSelectInput(x_disp,x_win,StructureNotifyMask|KeyPressMask
        |KeyReleaseMask|ExposureMask
        |ButtonPressMask
        |ButtonReleaseMask);
      XWarpPointer(x_disp,None,x_win,0,0,0,0, 
        (vid.width/2),(vid.height/2));
      XSelectInput(x_disp,x_win,StructureNotifyMask|KeyPressMask
        |KeyReleaseMask|ExposureMask
        |PointerMotionMask|ButtonPressMask
        |ButtonReleaseMask);
    } else {
      mouse_x = (float) (x_event.xmotion.x-p_mouse_x);
      mouse_y = (float) (x_event.xmotion.y-p_mouse_y);
      p_mouse_x=x_event.xmotion.x;
      p_mouse_y=x_event.xmotion.y;
    }
    break;

  case ButtonPress:
    b=-1;
    if (x_event.xbutton.button == 1)
      b = 0;
    else if (x_event.xbutton.button == 2)
      b = 2;
    else if (x_event.xbutton.button == 3)
      b = 1;
    if (b>=0)
      mouse_buttonstate |= 1<<b;
    break;

  case ButtonRelease:
    b=-1;
    if (x_event.xbutton.button == 1)
      b = 0;
    else if (x_event.xbutton.button == 2)
      b = 2;
    else if (x_event.xbutton.button == 3)
      b = 1;
    if (b>=0)
      mouse_buttonstate &= ~(1<<b);
    break;
  
  case ConfigureNotify:
//printf("config notify\n");
    config_notify_width = x_event.xconfigure.width;
    config_notify_height = x_event.xconfigure.height;
    config_notify = 1;
    break;

  default:
    if (doShm && x_event.type == x_shmeventtype)
      oktodraw = true;
  }
   
  if (old_windowed_mouse != _windowed_mouse.value) {
    old_windowed_mouse = _windowed_mouse.value;

    if (!_windowed_mouse.value) {
      /* ungrab the pointer */
      XUngrabPointer(x_disp,CurrentTime);
    } else {
      /* grab the pointer */
      XGrabPointer(x_disp,x_win,True,0,GrabModeAsync,
        GrabModeAsync,x_win,None,CurrentTime);
    }
  }
}

// flushes the given rectangles from the view buffer to the screen

void  VID_Update (vrect_t *rects)
{
  vrect_t full;

// if the window changes dimension, skip this frame

  if (config_notify)
  {
    fprintf(stderr, "config notify\n");
    config_notify = 0;
    vid.width = config_notify_width & ~7;
    vid.height = config_notify_height;
    if (doShm)
      ResetSharedFrameBuffers();
    else
      ResetFrameBuffer();
    vid.rowbytes = x_framebuffer[0]->bytes_per_line;
    vid.buffer = x_framebuffer[current_framebuffer]->data;
    vid.conbuffer = vid.buffer;
    vid.conwidth = vid.width;
    vid.conheight = vid.height;
    vid.conrowbytes = vid.rowbytes;
    vid.recalc_refdef = 1;        // force a surface cache flush
    Con_CheckResize();
    Con_Clear_f();
    return;
  }

  // force full update if not 8bit
  if (x_visinfo->depth != 8) {
    extern int scr_fullupdate;

    scr_fullupdate = 0;
  }


  if (doShm)
  {

    while (rects)
    {
      if (x_visinfo->depth == 16)
        st2_fixup( x_framebuffer[current_framebuffer], 
          rects->x, rects->y, rects->width,
          rects->height);
      else if (x_visinfo->depth == 24)
        st3_fixup( x_framebuffer[current_framebuffer], 
          rects->x, rects->y, rects->width,
          rects->height);
      if (!XShmPutImage(x_disp, x_win, x_gc,
        x_framebuffer[current_framebuffer], rects->x, rects->y,
        rects->x, rects->y, rects->width, rects->height, True))
          Sys_Error("VID_Update: XShmPutImage failed\n");
      oktodraw = false;
      while (!oktodraw) GetEvent();
      rects = rects->pnext;
    }
    current_framebuffer = !current_framebuffer;
    vid.buffer = x_framebuffer[current_framebuffer]->data;
    vid.conbuffer = vid.buffer;
    XSync(x_disp, False);
  }
  else
  {
    while (rects)
    {
      if (x_visinfo->depth == 16)
        st2_fixup( x_framebuffer[current_framebuffer], 
          rects->x, rects->y, rects->width,
          rects->height);
      else if (x_visinfo->depth == 24)
        st3_fixup( x_framebuffer[current_framebuffer], 
          rects->x, rects->y, rects->width,
          rects->height);
      XPutImage(x_disp, x_win, x_gc, x_framebuffer[0], rects->x,
        rects->y, rects->x, rects->y, rects->width, rects->height);
      rects = rects->pnext;
    }
    XSync(x_disp, False);
  }

}

static int dither;

void VID_DitherOn(void)
{
    if (dither == 0)
    {
    vid.recalc_refdef = 1;
        dither = 1;
    }
}

void VID_DitherOff(void)
{
    if (dither)
    {
    vid.recalc_refdef = 1;
        dither = 0;
    }
}

int Sys_OpenWindow(void)
{
  return 0;
}

void Sys_EraseWindow(int window)
{
}

void Sys_DrawCircle(int window, int x, int y, int r)
{
}

void Sys_DisplayWindow(int window)
{
}

void Sys_SendKeyEvents(void)
{
// get events from x server
  if (x_disp)
  {
    while (XPending(x_disp)) GetEvent();
    while (keyq_head != keyq_tail)
    {
      Key_Event(keyq[keyq_tail].key, keyq[keyq_tail].down);
      keyq_tail = (keyq_tail + 1) & 63;
    }
  }
}

#if 0
char *Sys_ConsoleInput (void)
{

  static char text[256];
  int   len;
  fd_set  readfds;
  int   ready;
  struct timeval timeout;

  timeout.tv_sec = 0;
  timeout.tv_usec = 0;
  FD_ZERO(&readfds);
  FD_SET(0, &readfds);
  ready = select(1, &readfds, 0, 0, &timeout);

  if (ready>0)
  {
    len = read (0, text, sizeof(text));
    if (len >= 1)
    {
      text[len-1] = 0;  // rip off the /n and terminate
      return text;
    }
  }

  return 0;
  
}
#endif

void D_BeginDirectRect (int x, int y, byte *pbitmap, int width, int height)
{
// direct drawing of the "accessing disk" icon isn't supported under Linux
}

void D_EndDirectRect (int x, int y, int width, int height)
{
// direct drawing of the "accessing disk" icon isn't supported under Linux
}

void IN_Init (void)
{
  Cvar_RegisterVariable (&_windowed_mouse);
  Cvar_RegisterVariable (&m_filter);
   if ( COM_CheckParm ("-nomouse") )
     return;
   mouse_x = mouse_y = 0.0;
   mouse_avail = 1;
}

void IN_Shutdown (void)
{
   mouse_avail = 0;
}

void IN_Commands (void)
{
  int i;
   
  if (!mouse_avail) return;
   
  for (i=0 ; i<mouse_buttons ; i++) {
    if ( (mouse_buttonstate & (1<<i)) && !(mouse_oldbuttonstate & (1<<i)) )
      Key_Event (K_MOUSE1 + i, true);

    if ( !(mouse_buttonstate & (1<<i)) && (mouse_oldbuttonstate & (1<<i)) )
      Key_Event (K_MOUSE1 + i, false);
  }
  mouse_oldbuttonstate = mouse_buttonstate;
}

void IN_Move (usercmd_t *cmd)
{
  if (!mouse_avail)
    return;
   
  if (m_filter.value) {
    mouse_x = (mouse_x + old_mouse_x) * 0.5;
    mouse_y = (mouse_y + old_mouse_y) * 0.5;
  }

  old_mouse_x = mouse_x;
  old_mouse_y = mouse_y;
   
  mouse_x *= sensitivity.value;
  mouse_y *= sensitivity.value;
   
  if ( (in_strafe.state & 1) || (lookstrafe.value && (in_mlook.state & 1) ))
    cmd->sidemove += m_side.value * mouse_x;
  else
    cl.viewangles[YAW] -= m_yaw.value * mouse_x;
  if (in_mlook.state & 1)
    V_StopPitchDrift ();
   
  if ( (in_mlook.state & 1) && !(in_strafe.state & 1)) {
    cl.viewangles[PITCH] += m_pitch.value * mouse_y;
    if (cl.viewangles[PITCH] > 80)
      cl.viewangles[PITCH] = 80;
    if (cl.viewangles[PITCH] < -70)
      cl.viewangles[PITCH] = -70;
  } else {
    if ((in_strafe.state & 1) && noclip_anglehack)
      cmd->upmove -= m_forward.value * mouse_y;
    else
      cmd->forwardmove -= m_forward.value * mouse_y;
  }
  mouse_x = mouse_y = 0.0;
}