glw_imp.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

	    }
	}

// 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

    gl_cx = glXCreateContext( x_disp, x_visinfo, 0, True );
    if (!glXMakeCurrent( x_disp, x_win, gl_cx ))
		Sys_Error( "Can't make window current to context\n" );

// even if MITSHM is available, make sure it's a local connection
#if 0
// This is messing up the DISPLAY environment variable so can't close and
// reopen the window (it lops off the :0.0)...
	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;
		}
	}
#endif

#if 0
	if (doShm)
	{
		x_shmeventtype = XShmGetEventBase(x_disp) + ShmCompletion;
		ResetSharedFrameBuffers();
	}
	else
		ResetFrameBuffer();
#endif

	current_framebuffer = 0;
/* 	vid.rowbytes = x_framebuffer[0]->bytes_per_line; */
/* 	vid.buffer = x_framebuffer[0]->data; */

//	XSynchronize(x_disp, False);

	X11_active = true;

	return true;
}

/*****************************************************************************/

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:	 key = K_KP_PGUP; break;
		case XK_Page_Up:	 key = K_PGUP; break;

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

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

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

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

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

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

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

		case XK_Escape: key = K_ESCAPE;		break;

		case XK_KP_Enter: key = K_KP_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 = K_KP_DEL; break;
		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_KP_5;	break;

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

		case XK_KP_Multiply: key = '*'; break;
		case XK_KP_Add:  key = K_KP_PLUS; break;
		case XK_KP_Subtract: key = K_KP_MINUS; break;
		case XK_KP_Divide: key = K_KP_SLASH; 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';
			break;
	} 

	return key;
}

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) {
			mx += ((int)x_event.xmotion.x - (int)(vid.width/2));
			my += ((int)x_event.xmotion.y - (int)(vid.height/2));

			/* move the mouse to the window center again */
			XSelectInput(x_disp,x_win, STD_EVENT_MASK & ~PointerMotionMask);
			XWarpPointer(x_disp,None,x_win,0,0,0,0, 
				(vid.width/2),(vid.height/2));
			XSelectInput(x_disp,x_win, STD_EVENT_MASK);
		} else {
			mx = ((int)x_event.xmotion.x - (int)p_mouse_x);
			my = ((int)x_event.xmotion.y - (int)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:
		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);
		}
	}
}

/*****************************************************************************/

/*****************************************************************************/
/* KEYBOARD                                                                  */
/*****************************************************************************/

Key_Event_fp_t Key_Event_fp;

void KBD_Init(Key_Event_fp_t fp)
{
	_windowed_mouse = ri.Cvar_Get ("_windowed_mouse", "0", CVAR_ARCHIVE);
	Key_Event_fp = fp;
}

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

void KBD_Close(void)
{
}


static void Force_CenterView_f (void)
{
	in_state->viewangles[PITCH] = 0;
}

static void RW_IN_MLookDown (void) 
{ 
	mlooking = true; 
}

static void RW_IN_MLookUp (void) 
{
	mlooking = false;
	in_state->IN_CenterView_fp ();
}

void RW_IN_Init(in_state_t *in_state_p)
{
	int mtype;
	int i;

	fprintf(stderr, "GL RW_IN_Init\n");

	in_state = in_state_p;

	// mouse variables
	_windowed_mouse = ri.Cvar_Get ("_windowed_mouse", "0", CVAR_ARCHIVE);
	m_filter = ri.Cvar_Get ("m_filter", "0", 0);
    in_mouse = ri.Cvar_Get ("in_mouse", "1", CVAR_ARCHIVE);
	freelook = ri.Cvar_Get( "freelook", "0", 0 );
	lookstrafe = ri.Cvar_Get ("lookstrafe", "0", 0);
	sensitivity = ri.Cvar_Get ("sensitivity", "3", 0);
	m_pitch = ri.Cvar_Get ("m_pitch", "0.022", 0);
	m_yaw = ri.Cvar_Get ("m_yaw", "0.022", 0);
	m_forward = ri.Cvar_Get ("m_forward", "1", 0);
	m_side = ri.Cvar_Get ("m_side", "0.8", 0);

	ri.Cmd_AddCommand ("+mlook", RW_IN_MLookDown);
	ri.Cmd_AddCommand ("-mlook", RW_IN_MLookUp);

	ri.Cmd_AddCommand ("force_centerview", Force_CenterView_f);

	mouse_x = mouse_y = 0.0;
	mouse_avail = true;
}

void RW_IN_Shutdown(void)
{
	mouse_avail = false;

	ri.Cmd_RemoveCommand ("force_centerview");
	ri.Cmd_RemoveCommand ("+mlook");
	ri.Cmd_RemoveCommand ("-mlook");
}

/*
===========
IN_Commands
===========
*/
void RW_IN_Commands (void)
{
	int i;
   
	if (!mouse_avail) 
		return;
   
	for (i=0 ; i<3 ; i++) {
		if ( (mouse_buttonstate & (1<<i)) && !(mouse_oldbuttonstate & (1<<i)) )
			in_state->Key_Event_fp (K_MOUSE1 + i, true);

		if ( !(mouse_buttonstate & (1<<i)) && (mouse_oldbuttonstate & (1<<i)) )
			in_state->Key_Event_fp (K_MOUSE1 + i, false);
	}
	mouse_oldbuttonstate = mouse_buttonstate;
}

/*
===========
IN_Move
===========
*/
void RW_IN_Move (usercmd_t *cmd)
{
	if (!mouse_avail)
		return;
   
	if (m_filter->value)
	{
		mouse_x = (mx + old_mouse_x) * 0.5;
		mouse_y = (my + old_mouse_y) * 0.5;
	} else {
		mouse_x = mx;
		mouse_y = my;
	}

	old_mouse_x = mx;
	old_mouse_y = my;

	if (!mouse_x && !mouse_y)
		return;

	mouse_x *= sensitivity->value;
	mouse_y *= sensitivity->value;

// add mouse X/Y movement to cmd
	if ( (*in_state->in_strafe_state & 1) || 
		(lookstrafe->value && mlooking ))
		cmd->sidemove += m_side->value * mouse_x;
	else
		in_state->viewangles[YAW] -= m_yaw->value * mouse_x;

	if ( (mlooking || freelook->value) && 
		!(*in_state->in_strafe_state & 1))
	{
		in_state->viewangles[PITCH] += m_pitch->value * mouse_y;
	}
	else
	{
		cmd->forwardmove -= m_forward->value * mouse_y;
	}
	mx = my = 0;
}

void RW_IN_Frame (void)
{
}

void RW_IN_Activate(void)
{
}


//===============================================================================

/*
================
Sys_MakeCodeWriteable
================
*/
void Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)
{

	int r;
	unsigned long addr;
	int psize = getpagesize();

	addr = (startaddr & ~(psize-1)) - psize;

//	fprintf(stderr, "writable code %lx(%lx)-%lx, length=%lx\n", startaddr,
//			addr, startaddr+length, length);

	r = mprotect((char*)addr, length + startaddr - addr + psize, 7);

	if (r < 0)
    		Sys_Error("Protection change failed\n");

}