/*
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

typedef unsigned short PIXEL;

#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;

// not used
int		VGA_width, VGA_height, VGA_rowbytes, VGA_bufferrowbytes, VGA_planar;
byte	*VGA_pagebase;


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);

static PIXEL st2d_8to16table[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;
}

PIXEL xlib_rgb (int r, int g, int b)
{
	PIXEL 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;
	PIXEL *dest;
	
	if ( (x < 0) || (y < 0)) return;
	
	for (yi = y; yi < (y + height); yi++)
	{
		src = &framebuf->data [yi * framebuf->bytes_per_line];
		dest = (PIXEL*) src;
		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;
	
	S_Init();
	
	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_rgb (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)
{

// 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;
	}
	
	if (doShm)
	{
	
		while (rects)
		{
			if (x_visinfo->depth != 8)
				st2_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 != 8)
				st2_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;
}

void VID_LockBuffer (void)
{
}

void VID_UnlockBuffer (void)
{
}

