/*
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_x11.c -- general x video driver

#define _BSD

typedef	unsigned short	PIXEL16;
typedef	unsigned int	PIXEL24;

#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", CVAR_ARCHIVE};
cvar_t		m_filter = {"m_filter","0", CVAR_ARCHIVE};
cvar_t		cl_keypad = {"cl_keypad", "1"};
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, p_mouse_y;
int		ignorenext, bits_per_pixel;

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	int		x_shmeventtype;

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;

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 (void)
{
	unsigned int	x;

	r_mask = x_vis->red_mask;
	g_mask = x_vis->green_mask;
	b_mask = x_vis->blue_mask;

	if (r_mask > (1 << 31) || g_mask > (1 << 31) || b_mask > (1 << 31))
		Sys_Error ("XGetVisualInfo returned bogus rgb 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)
		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)
		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;

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

	for (yi = y ; yi < y + height ; yi++)
	{
		src = &framebuf->data[yi*framebuf->bytes_per_line];
		dest = (PIXEL16 *)src;
		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;

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

	for (yi = y ; yi < y + height ; yi++)
	{
		src = &framebuf->data[yi*framebuf->bytes_per_line];
		dest = (PIXEL24 *)src;
		for (xi = (x + width - 1) ; xi >= x ; xi--)
			dest[xi] = st2d_8to24table[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, 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;

	if (!(d_pzbuffer = Hunk_HighAllocName(X11_buffersize, "video")))
		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, Q_malloc(mem), vid.width, vid.height, 32, 0);

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

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

void ResetSharedFrameBuffers(void)
{
	int	size, key, frm;
	int	minsize = getpagesize ();

	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;

	if (!(d_pzbuffer = Hunk_HighAllocName (X11_buffersize, "video")))
		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);

		if (verbose)
			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, num_visuals, template_mask;
	XVisualInfo	template;

	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
	if (!(x_disp = XOpenDisplay (0)))
	{
		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)
	{
		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, "JoeQuake");

		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[MAX_OSPATH], *d;

		doShm = true;
		if ((d = (char *)getenv("DISPLAY")))
		{
			Q_strncpyz (displayname, d, sizeof(displayname));
			for (d = displayname; *d && (*d != ':'); d++)
				;
			*d = 0;
			if (!(!Q_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.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, kp;
	char	buf[64];
	KeySym	keysym;

	key = 0;
	kp = (int)cl_keypad.value;

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

	switch (keysym)
	{
	case XK_Scroll_Lock: key = K_SCRLCK; break;

	case XK_Caps_Lock: key = K_CAPSLOCK; break;

	case XK_Num_Lock: key = kp ? KP_NUMLOCK : K_PAUSE; break;

	case XK_KP_Page_Up: key = kp ? KP_PGUP : K_PGUP; break;
	case XK_Page_Up: key = K_PGUP; break;

	case XK_KP_Page_Down: key = kp ? KP_PGDN : K_PGDN; break;
	case XK_Page_Down: key = K_PGDN; break;

	case XK_KP_Home: key = kp ? KP_HOME : K_HOME; break;
	case XK_Home: key = K_HOME; break;

	case XK_KP_End: key = kp ? KP_END : K_END; break;
	case XK_End: key = K_END; break;

	case XK_KP_Left: key = kp ? KP_LEFTARROW : K_LEFTARROW; break;
	case XK_Left: key = K_LEFTARROW; break;

	case XK_KP_Right: key = kp ? KP_RIGHTARROW : K_RIGHTARROW; break;
	case XK_Right: key = K_RIGHTARROW; break;

	case XK_KP_Down: key = kp ? KP_DOWNARROW : K_DOWNARROW; break;

	case XK_Down: key = K_DOWNARROW; break;

	case XK_KP_Up: key = kp ? KP_UPARROW : K_UPARROW; break;

	case XK_Up: key = K_UPARROW; break;

	case XK_Escape: key = K_ESCAPE; break;

	case XK_KP_Enter: key = kp ? KP_ENTER : K_ENTER; break;

	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: key = kp ? KP_DEL : K_DEL; break;
	case XK_Delete: key = K_DEL; break;

	case XK_Pause: key = K_PAUSE; break;

	case XK_Shift_L: key = K_LSHIFT; break;								
	case XK_Shift_R: key = K_RSHIFT; break;

	case XK_Execute:
	case XK_Control_L: key = K_LCTRL; break;
	case XK_Control_R: key = K_RCTRL; break;

	case XK_Alt_L:
	case XK_Meta_L: key = K_LALT; break;								
	case XK_Alt_R:
	case XK_Meta_R: key = K_RALT; break;

	case XK_Super_L: key = K_LWIN; break;
	case XK_Super_R: key = K_RWIN; break;
	case XK_Menu: key = K_MENU; break;

	case XK_KP_Begin: key = kp ? KP_5 : '5'; break;

	case XK_KP_Insert: key = kp ? KP_INS : K_INS; break;
	case XK_Insert: key = K_INS; break;

	case XK_KP_Multiply: key = kp ? KP_STAR : '*'; break;

	case XK_KP_Add: key = kp ? KP_PLUS : '+'; break;

	case XK_KP_Subtract: key = kp ? KP_MINUS : '-'; break;

	case XK_KP_Divide: key = kp ? KP_SLASH : '/'; break;

	default:
		key = *(unsigned char *)buf;
		if (key >= 'A' && key <= 'Z')
			key = key - 'A' + 'a';
		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, config_notify_height;

void GetEvent (void)
{
	XEvent	event;

	XNextEvent (x_disp, &event);
	switch (event.type)
	{
	case KeyPress:
		keyq[keyq_head].key = XLateKey (&event.xkey);
		keyq[keyq_head].down = true;
		keyq_head = (keyq_head + 1) & 63;
		break;

	case KeyRelease:
		keyq[keyq_head].key = XLateKey (&event.xkey);
		keyq[keyq_head].down = false;
		keyq_head = (keyq_head + 1) & 63;
		break;

	case MotionNotify:
		if (_windowed_mouse.value)
		{
			mouse_x = (float)((int)event.xmotion.x - (int)(vid.width / 2));
			mouse_y = (float)((int)event.xmotion.y - (int)(vid.height / 2));

			// 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)(event.xmotion.x-p_mouse_x);
			mouse_y = (float)(event.xmotion.y-p_mouse_y);
			p_mouse_x = event.xmotion.x;
			p_mouse_y = event.xmotion.y;
		}
		break;

	case ButtonPress:
	case ButtonRelease:
		switch (event.xbutton.button)
		{
		case 1:
			Key_Event(K_MOUSE1, event.type == ButtonPress);
			break;

		case 2:
			Key_Event(K_MOUSE3, event.type == ButtonPress);
			break;

		case 3:
			Key_Event(K_MOUSE2, event.type == ButtonPress);
			break;

		case 4:
			Key_Event(K_MWHEELUP, event.type == ButtonPress);
			break;

		case 5:
			Key_Event(K_MWHEELDOWN, event.type == ButtonPress);
			break;
		}
		break;

	case ConfigureNotify:
		config_notify_width = event.xconfigure.width;
		config_notify_height = event.xconfigure.height;
		config_notify = 1;
		break;

	default:
		if (doShm && 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.conwidth = vid.width;
		vid.conheight = vid.height;
		vid.recalc_refdef = 1;			// force a surface cache flush
		Con_CheckResize ();
		Con_Clear_f ();
		return;
	}

	if (doShm)
	{
		while (rects)
		{
			if (x_visinfo->depth == 24)
				st3_fixup (x_framebuffer[current_framebuffer], rects->x, rects->y, rects->width, rects->height);
			else if (x_visinfo->depth == 16)
				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;
		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);
	}
}

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;
		}
	}
}

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 Force_CenterView_f (void)
{
	cl.viewangles[PITCH] = 0;
}

void IN_Init (void)
{
	Cmd_AddCommand ("force_centerview", Force_CenterView_f);
	if (COM_CheckParm("-nomouse"))
	    return;
	Cvar_Register (&_windowed_mouse);
	Cvar_Register (&m_filter);
	Cvar_Register (&cl_keypad);
	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)
{
	float	tx, ty;

	if (!mouse_avail)
		return;
   
	tx = mouse_x;
	ty = mouse_y;

	if (m_filter.value)
	{
		mouse_x = (tx + old_mouse_x) * 0.5;
		mouse_y = (ty + old_mouse_y) * 0.5;
	}

	old_mouse_x = tx;
	old_mouse_y = ty;
   
	mouse_x *= sensitivity.value;
	mouse_y *= sensitivity.value;
   
	if ((in_strafe.state & 1) || (lookstrafe.value && mlook_active))
		cmd->sidemove += m_side.value * mouse_x;
	else
		cl.viewangles[YAW] -= m_yaw.value * mouse_x;

	if (mlook_active)
		V_StopPitchDrift ();
   
	if (mlook_active && !(in_strafe.state & 1))
	{
		cl.viewangles[PITCH] += m_pitch.value * mouse_y;
		cl.viewangles[PITCH] = bound(-70, cl.viewangles[PITCH], 80);
	}
	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)
{
}
