newtree/source/gl_screen.c

/*
	gl_screen.c

	master for refresh, status bar, console, chat, notify, etc

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <string.h>
#include <time.h>

#include "cl_parse.h"
#include "cmd.h"
#include "console.h"
#include "draw.h"
#include "glquake.h"
#include "host.h"
#include "keys.h"
#include "menu.h"
#include "pcx.h"
#include "qendian.h"
#include "sbar.h"
#include "skin.h"
#include "sys.h"
#include "view.h"

/*

background clear
rendering
turtle/net/ram icons
sbar
centerprint / slow centerprint
notify lines
intermission / finale overlay
loading plaque
console
menu

required background clears
required update regions


syncronous draw mode or async
One off screen buffer, with updates either copied or xblited
Need to double buffer?


async draw will require the refresh area to be cleared, because it will be
xblited, but sync draw can just ignore it.

sync
draw

CenterPrint ()
SlowPrint ()
Screen_Update ();
Con_Printf ();

net 
turn off messages option

the refresh is allways rendered, unless the console is full screen


console is:
	notify lines
	half
	full
	

*/

int         glx, gly, glwidth, glheight;

// only the refresh window will be updated unless these variables are flagged 
int         scr_copytop;
int         scr_copyeverything;

float       scr_con_current;
float       scr_conlines;				// lines of console to display

int         oldscreensize, oldfov;
int         oldsbar;
cvar_t     *scr_viewsize;
cvar_t     *scr_fov;					// 10 - 170
cvar_t     *scr_conspeed;
cvar_t     *scr_centertime;
cvar_t     *scr_showram;
cvar_t     *scr_showturtle;
cvar_t     *scr_showpause;
cvar_t     *scr_printspeed;
cvar_t     *gl_triplebuffer;
cvar_t     *crosshair;
cvar_t     *crosshaircolor;
cvar_t     *cl_crossx;
cvar_t     *cl_crossy;

qboolean    scr_initialized;			// ready to draw

qpic_t     *scr_ram;
qpic_t     *scr_net;
qpic_t     *scr_turtle;

int         scr_fullupdate;

int         clearconsole;
int         clearnotify;

extern int  sb_lines;

viddef_t    vid;						// global video state

vrect_t     scr_vrect;

qboolean    scr_disabled_for_loading;
float       scr_disabled_time;

qboolean    block_drawing;

void        SCR_ScreenShot_f (void);
void        SCR_RSShot_f (void);

/*
===============================================================================

CENTER PRINTING

===============================================================================
*/

char        scr_centerstring[1024];
float       scr_centertime_start;		// for slow victory printing
float       scr_centertime_off;
int         scr_center_lines;
int         scr_erase_lines;
int         scr_erase_center;

/*
==============
SCR_CenterPrint

Called for important messages that should stay in the center of the screen
for a few moments
==============
*/
void
SCR_CenterPrint (char *str)
{
	strncpy (scr_centerstring, str, sizeof (scr_centerstring) - 1);
	scr_centertime_off = scr_centertime->value;
	scr_centertime_start = cl.time;

	// count the number of lines for centering
	scr_center_lines = 1;
	while (*str) {
		if (*str == '\n')
			scr_center_lines++;
		str++;
	}
}


void
SCR_DrawCenterString (void)
{
	char       *start;
	int         l;
	int         j;
	int         x, y;
	int         remaining;

	// the finale prints the characters one at a time
	if (cl.intermission)
		remaining = scr_printspeed->value * (cl.time - scr_centertime_start);
	else
		remaining = 9999;

	scr_erase_center = 0;
	start = scr_centerstring;

	if (scr_center_lines <= 4)
		y = vid.height * 0.35;
	else
		y = 48;

	do {								// scan the width of the line
		for (l = 0; l < 40; l++)
			if (start[l] == '\n' || !start[l])
				break;
		x = (vid.width - l * 8) / 2;
		for (j = 0; j < l; j++, x += 8) {
			Draw_Character8 (x, y, start[j]);
			if (!remaining--)
				return;
		}

		y += 8;

		while (*start && *start != '\n')
			start++;

		if (!*start)
			break;
		start++;						// skip the \n
	} while (1);
}

void
SCR_CheckDrawCenterString (void)
{
	scr_copytop = 1;
	if (scr_center_lines > scr_erase_lines)
		scr_erase_lines = scr_center_lines;

	scr_centertime_off -= host_frametime;

	if (scr_centertime_off <= 0 && !cl.intermission)
		return;
	if (key_dest != key_game)
		return;

	SCR_DrawCenterString ();
}

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

/*
====================
CalcFov
====================
*/
float
CalcFov (float fov_x, float width, float height)
{
	float       a;
	float       x;

	if (fov_x < 1 || fov_x > 179)
		Sys_Error ("Bad fov: %f", fov_x);

	x = width / tan (fov_x / 360 * M_PI);

	a = (x == 0) ? 90 : atan (height / x);	// 0 shouldn't happen

	a = a * 360 / M_PI;

	return a;
}

/*
	SCR_CalcRefdef

	Must be called whenever vid changes
	Internal use only
*/
static void
SCR_CalcRefdef (void)
{
	float       size;
	int         h;
	qboolean    full = false;


	scr_fullupdate = 0;					// force a background redraw
	vid.recalc_refdef = 0;

// force the status bar to redraw
	Sbar_Changed ();

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

// bound viewsize
	Cvar_SetValue (scr_viewsize, bound (30, scr_viewsize->int_val, 120));

// bound field of view
	Cvar_SetValue (scr_fov, bound (10, scr_fov->value, 170));

	if (scr_viewsize->int_val >= 120)
		sb_lines = 0;					// no status bar at all
	else if (scr_viewsize->int_val >= 110)
		sb_lines = 24;					// no inventory
	else
		sb_lines = 24 + 16 + 8;

	if (scr_viewsize->int_val >= 100) {
		full = true;
		size = 100.0;
	} else {
		size = scr_viewsize->int_val;
	}
	// intermission is always full screen   
	if (cl.intermission) {
		full = true;
		size = 100.0;
		sb_lines = 0;
	}
	size /= 100.0;

	if (!cl_sbar->int_val && full)
		h = vid.height;
	else
		h = vid.height - sb_lines;

	r_refdef.vrect.width = vid.width * size + 0.5;
	if (r_refdef.vrect.width < 96) {
		size = 96.0 / r_refdef.vrect.width;
		r_refdef.vrect.width = 96;		// min for icons
	}

	r_refdef.vrect.height = vid.height * size + 0.5;
	if (cl_sbar->int_val || !full) {
		if (r_refdef.vrect.height > vid.height - sb_lines)
			r_refdef.vrect.height = vid.height - sb_lines;
	} else if (r_refdef.vrect.height > vid.height)
		r_refdef.vrect.height = vid.height;
	r_refdef.vrect.x = (vid.width - r_refdef.vrect.width) / 2;
	if (full)
		r_refdef.vrect.y = 0;
	else
		r_refdef.vrect.y = (h - r_refdef.vrect.height) / 2;

	r_refdef.fov_x = scr_fov->int_val;
	r_refdef.fov_y =
		CalcFov (r_refdef.fov_x, r_refdef.vrect.width, r_refdef.vrect.height);

	scr_vrect = r_refdef.vrect;
}


/*
	SCR_SizeUp_f

	Keybinding command
*/
void
SCR_SizeUp_f (void)
{
	if (scr_viewsize->int_val < 120) {
		Cvar_SetValue (scr_viewsize, scr_viewsize->int_val + 10);
		vid.recalc_refdef = 1;
	}
}


/*
	SCR_SizeDown_f

	Keybinding command
*/
void
SCR_SizeDown_f (void)
{
	Cvar_SetValue (scr_viewsize, scr_viewsize->int_val - 10);
	vid.recalc_refdef = 1;
}

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

/*
==================
SCR_Init
==================
*/
void
SCR_Init_Cvars (void)
{
	scr_fov = Cvar_Get ("fov", "90", CVAR_NONE, "None");
	scr_viewsize = Cvar_Get ("viewsize", "100", CVAR_ARCHIVE, "None");
	scr_conspeed = Cvar_Get ("scr_conspeed", "300", CVAR_NONE, "None");
	scr_showram = Cvar_Get ("showram", "1", CVAR_NONE, "None");
	scr_showturtle = Cvar_Get ("showturtle", "0", CVAR_NONE, "None");
	scr_showpause = Cvar_Get ("showpause", "1", CVAR_NONE, "None");
	scr_centertime = Cvar_Get ("scr_centertime", "2", CVAR_NONE, "None");
	scr_printspeed = Cvar_Get ("scr_printspeed", "8", CVAR_NONE, "None");
	gl_triplebuffer = Cvar_Get ("gl_triplebuffer", "1", CVAR_ARCHIVE, "None");

	crosshaircolor = Cvar_Get ("crosshaircolor", "79", CVAR_ARCHIVE, "None");
	crosshair = Cvar_Get ("crosshair", "0", CVAR_ARCHIVE, "None");
	cl_crossx = Cvar_Get ("cl_crossx", "0", CVAR_ARCHIVE, "None");
	cl_crossy = Cvar_Get ("cl_crossy", "0", CVAR_ARCHIVE, "None");
}

void
SCR_Init (void)
{
//
// register our commands
//
	Cmd_AddCommand ("screenshot", SCR_ScreenShot_f);
	Cmd_AddCommand ("snap", SCR_RSShot_f);
	Cmd_AddCommand ("sizeup", SCR_SizeUp_f);
	Cmd_AddCommand ("sizedown", SCR_SizeDown_f);

	scr_ram = Draw_PicFromWad ("ram");
	scr_net = Draw_PicFromWad ("net");
	scr_turtle = Draw_PicFromWad ("turtle");

	scr_initialized = true;
}

 /* 
    SCR_DrawRam */
void
SCR_DrawRam (void)
{
	if (!scr_showram->int_val)
		return;

	if (!r_cache_thrash)
		return;

	Draw_Pic (scr_vrect.x + 32, scr_vrect.y, scr_ram);
}


/*
==============
SCR_DrawTurtle
==============
*/
void
SCR_DrawTurtle (void)
{
	static int  count;

	if (!scr_showturtle->int_val)
		return;

	if (host_frametime < 0.1) {
		count = 0;
		return;
	}

	count++;
	if (count < 3)
		return;

	Draw_Pic (scr_vrect.x, scr_vrect.y, scr_turtle);
}

/*
==============
SCR_DrawNet
==============
*/
void
SCR_DrawNet (void)
{
	if (cls.netchan.outgoing_sequence - cls.netchan.incoming_acknowledged <
		UPDATE_BACKUP - 1)
		return;
	if (cls.demoplayback)
		return;

	Draw_Pic (scr_vrect.x + 64, scr_vrect.y, scr_net);
}

void
SCR_DrawFPS (void)
{
	extern cvar_t *show_fps;
	static double lastframetime;
	double      t;
	extern int  fps_count;
	static int  lastfps;
	int         x, y;
	char        st[80];

	if (!show_fps->int_val)
		return;

	t = Sys_DoubleTime ();
	if ((t - lastframetime) >= 1.0) {
		lastfps = fps_count;
		fps_count = 0;
		lastframetime = t;
	}
	/* Misty: I really do need to read about snprintf a bit. This thing keeps 
	   chewing on my foot! */
	snprintf (st, sizeof (st), "%-3d FPS", lastfps);
	/* Misty: New trick! (for me) the ? makes this work like a if then else - 
	   IE: if cl_hudswap->int_val is not null, do first case, else (else is a 
	   : here) do second case. Deek taught me this trick */
	x = cl_hudswap->int_val ? vid.width - ((strlen (st) * 8) + 8) : 8;
	y = vid.height - sb_lines - 8;
	Draw_String8 (x, y, st);

}

/* Misty: I like to see the time */
void
SCR_DrawTime (void)
{
	extern cvar_t *show_time;
	int         x, y;
	char        st[80];
	char        local_time[120];
	time_t      systime;

	/* any cvar that can take multiple settings must be able to handle abuse. 
	 */
	if (show_time->int_val <= 0)
		return;

	/* actually find the time and set systime to it */
	time (&systime);

	if (show_time->int_val == 1) {
		/* now set local_time to 24 hour time using hours:minutes format */
		strftime (local_time, sizeof (local_time), "%k:%M",
				  localtime (&systime));
	} else if (show_time->int_val >= 2) {
		/* >= is another abuse protector */
		strftime (local_time, sizeof (local_time), "%l:%M %P",
				  localtime (&systime));
	}

	/* now actually print it to the screen directly above where show_fps is */
	snprintf (st, sizeof (st), "%s", local_time);
	x = cl_hudswap->int_val ? vid.width - ((strlen (st) * 8) + 8) : 8;
	y = vid.height - sb_lines - 16;
	Draw_String8 (x, y, st);
}

/*
==============
DrawPause
==============
*/
void
SCR_DrawPause (void)
{
	qpic_t     *pic;

	if (!scr_showpause->int_val)		// turn off for screenshots
		return;

	if (!cl.paused)
		return;

	pic = Draw_CachePic ("gfx/pause.lmp");
	Draw_Pic ((vid.width - pic->width) / 2,
			  (vid.height - 48 - pic->height) / 2, pic);
}

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


/*
==================
SCR_SetUpToDrawConsole
==================
*/
void
SCR_SetUpToDrawConsole (void)
{
	Con_CheckResize ();

// decide on the height of the console
	if (cls.state != ca_active) {
		scr_conlines = vid.height;		// full screen
		scr_con_current = scr_conlines;
	} else if (key_dest == key_console)
		scr_conlines = vid.height / 2;	// half screen
	else
		scr_conlines = 0;				// none visible

	if (scr_conlines < scr_con_current) {
		scr_con_current -= scr_conspeed->value * host_frametime;
		if (scr_conlines > scr_con_current)
			scr_con_current = scr_conlines;

	} else if (scr_conlines > scr_con_current) {
		scr_con_current += scr_conspeed->value * host_frametime;
		if (scr_conlines < scr_con_current)
			scr_con_current = scr_conlines;
	}

	if (clearconsole++ < vid.numpages) {
		Sbar_Changed ();
	} else if (clearnotify++ < vid.numpages) {
	} else
		con_notifylines = 0;
}

/*
==================
SCR_DrawConsole
==================
*/
void
SCR_DrawConsole (void)
{
	if (scr_con_current) {
		scr_copyeverything = 1;
		Con_DrawConsole (scr_con_current);
		clearconsole = 0;
	} else {
		if (key_dest == key_game || key_dest == key_message)
			Con_DrawNotify ();			// only draw notify in game
	}
}


/* 
============================================================================== 
 
						SCREEN SHOTS 
 
============================================================================== 
*/

typedef struct _TargaHeader {
	unsigned char id_length, colormap_type, image_type;
	unsigned short colormap_index, colormap_length;
	unsigned char colormap_size;
	unsigned short x_origin, y_origin, width, height;
	unsigned char pixel_size, attributes;
} TargaHeader;


/* 
================== 
SCR_ScreenShot_f
================== 
*/
void
SCR_ScreenShot_f (void)
{
	byte       *buffer;
	char        pcxname[80];
	char        checkname[MAX_OSPATH];
	int         i;

// 
// find a file name to save it to 
// 
	strcpy (pcxname, "qf000.tga");

	for (i = 0; i <= 999; i++) {
		pcxname[2] = i / 100 + '0';
		pcxname[3] = i / 10 % 10 + '0';
		pcxname[4] = i % 10 + '0';
		snprintf (checkname, sizeof (checkname), "%s/%s", com_gamedir, pcxname);
		if (Sys_FileTime (checkname) == -1)
			break;						// file doesn't exist
	}
	if (i == 1000) {
		Con_Printf ("SCR_ScreenShot_f: Couldn't create a PCX file\n");
		return;
	}


	buffer = malloc (glwidth * glheight * 3 + 18);
	memset (buffer, 0, 18);
	buffer[2] = 2;						// uncompressed type
	buffer[12] = glwidth & 255;
	buffer[13] = glwidth >> 8;
	buffer[14] = glheight & 255;
	buffer[15] = glheight >> 8;
	buffer[16] = 24;					// pixel size

	glReadPixels (glx, gly, glwidth, glheight, GL_BGR, GL_UNSIGNED_BYTE,
				  buffer + 18);
	COM_WriteFile (pcxname, buffer, glwidth * glheight * 3 + 18);

	free (buffer);
	Con_Printf ("Wrote %s\n", pcxname);
}

/* 
============== 
WritePCXfile 
============== 
*/
void
WritePCXfile (char *filename, byte * data, int width, int height,
			  int rowbytes, byte * palette, qboolean upload)
{
	int         i, j, length;
	pcx_t      *pcx;
	byte       *pack;

	pcx = Hunk_TempAlloc (width * height * 2 + 1000);
	if (pcx == NULL) {
		Con_Printf ("SCR_ScreenShot_f: not enough memory\n");
		return;
	}

	pcx->manufacturer = 0x0a;			// PCX id
	pcx->version = 5;					// 256 color
	pcx->encoding = 1;					// uncompressed
	pcx->bits_per_pixel = 8;			// 256 color
	pcx->xmin = 0;
	pcx->ymin = 0;
	pcx->xmax = LittleShort ((short) (width - 1));
	pcx->ymax = LittleShort ((short) (height - 1));
	pcx->hres = LittleShort ((short) width);
	pcx->vres = LittleShort ((short) height);
	memset (pcx->palette, 0, sizeof (pcx->palette));
	pcx->color_planes = 1;				// chunky image
	pcx->bytes_per_line = LittleShort ((short) width);
	pcx->palette_type = LittleShort (2);	// not a grey scale
	memset (pcx->filler, 0, sizeof (pcx->filler));

// pack the image
	pack = &pcx->data;

	data += rowbytes * (height - 1);

	for (i = 0; i < height; i++) {
		for (j = 0; j < width; j++) {
			if ((*data & 0xc0) != 0xc0)
				*pack++ = *data++;
			else {
				*pack++ = 0xc1;
				*pack++ = *data++;
			}
		}

		data += rowbytes - width;
		data -= rowbytes * 2;
	}

// write the palette
	*pack++ = 0x0c;						// palette ID byte
	for (i = 0; i < 768; i++)
		*pack++ = *palette++;

// write output file 
	length = pack - (byte *) pcx;

	if (upload)
		CL_StartUpload ((void *) pcx, length);
	else
		COM_WriteFile (filename, pcx, length);
}



/*
Find closest color in the palette for named color
*/
int
MipColor (int r, int g, int b)
{
	int         i;
	float       dist;
	int         best = 0;
	float       bestdist;
	int         r1, g1, b1;
	static int  lr = -1, lg = -1, lb = -1;
	static int  lastbest;

	if (r == lr && g == lg && b == lb)
		return lastbest;

	bestdist = 256 * 256 * 3;

	for (i = 0; i < 256; i++) {
		r1 = host_basepal[i * 3] - r;
		g1 = host_basepal[i * 3 + 1] - g;
		b1 = host_basepal[i * 3 + 2] - b;
		dist = r1 * r1 + g1 * g1 + b1 * b1;
		if (dist < bestdist) {
			bestdist = dist;
			best = i;
		}
	}
	lr = r;
	lg = g;
	lb = b;
	lastbest = best;
	return best;
}

// from gl_draw.c
byte       *draw_chars;					// 8*8 graphic characters

void
SCR_DrawCharToSnap (int num, byte * dest, int width)
{
	int         row, col;
	byte       *source;
	int         drawline;
	int         x;

	row = num >> 4;
	col = num & 15;
	source = draw_chars + (row << 10) + (col << 3);

	drawline = 8;

	while (drawline--) {
		for (x = 0; x < 8; x++)
			if (source[x])
				dest[x] = source[x];
			else
				dest[x] = 98;
		source += 128;
		dest -= width;
	}

}

void
SCR_DrawStringToSnap (const char *s, byte * buf, int x, int y, int width)
{
	byte       *dest;
	const unsigned char *p;

	dest = buf + ((y * width) + x);

	p = (const unsigned char *) s;
	while (*p) {
		SCR_DrawCharToSnap (*p++, dest, width);
		dest += 8;
	}
}


/* 
================== 
SCR_RSShot_f
================== 
*/
void
SCR_RSShot_f (void)
{
	int         x, y;
	unsigned char *src, *dest;
	char        pcxname[80];
	unsigned char *newbuf;
	int         w, h;
	int         dx, dy, dex, dey, nx;
	int         r, b, g;
	int         count;
	float       fracw, frach;
	char        st[80];
	time_t      now;

	if (CL_IsUploading ())
		return;							// already one pending

	if (cls.state < ca_onserver)
		return;							// gotta be connected

	Con_Printf ("Remote screen shot requested.\n");

#if 0
// 
// find a file name to save it to 
// 
	strcpy (pcxname, "mquake00.pcx");

	for (i = 0; i <= 99; i++) {
		pcxname[6] = i / 10 + '0';
		pcxname[7] = i % 10 + '0';
		snprintf (checkname, sizeof (checkname), "%s/%s", com_gamedir, pcxname);
		if (Sys_FileTime (checkname) == -1)
			break;						// file doesn't exist
	}
	if (i == 100) {
		Con_Printf ("SCR_ScreenShot_f: Couldn't create a PCX");
		return;
	}
#endif

// 
// save the pcx file 
// 
	newbuf = malloc (glheight * glwidth * 3);

	glReadPixels (glx, gly, glwidth, glheight, GL_RGB, GL_UNSIGNED_BYTE,
				  newbuf);

	w = (vid.width < RSSHOT_WIDTH) ? glwidth : RSSHOT_WIDTH;
	h = (vid.height < RSSHOT_HEIGHT) ? glheight : RSSHOT_HEIGHT;

	fracw = (float) glwidth / (float) w;
	frach = (float) glheight / (float) h;

	for (y = 0; y < h; y++) {
		dest = newbuf + (w * 3 * y);

		for (x = 0; x < w; x++) {
			r = g = b = 0;

			dx = x * fracw;
			dex = (x + 1) * fracw;
			if (dex == dx)
				dex++;					// at least one
			dy = y * frach;
			dey = (y + 1) * frach;
			if (dey == dy)
				dey++;					// at least one

			count = 0;
			for ( /* */ ; dy < dey; dy++) {
				src = newbuf + (glwidth * 3 * dy) + dx * 3;
				for (nx = dx; nx < dex; nx++) {
					r += *src++;
					g += *src++;
					b += *src++;
					count++;
				}
			}
			r /= count;
			g /= count;
			b /= count;
			*dest++ = r;
			*dest++ = b;
			*dest++ = g;
		}
	}

	// convert to eight bit
	for (y = 0; y < h; y++) {
		src = newbuf + (w * 3 * y);
		dest = newbuf + (w * y);

		for (x = 0; x < w; x++) {
			*dest++ = MipColor (src[0], src[1], src[2]);
			src += 3;
		}
	}

	time (&now);
	strcpy (st, ctime (&now));
	st[strlen (st) - 1] = 0;
	SCR_DrawStringToSnap (st, newbuf, w - strlen (st) * 8, h - 1, w);

	strncpy (st, cls.servername, sizeof (st));
	st[sizeof (st) - 1] = 0;
	SCR_DrawStringToSnap (st, newbuf, w - strlen (st) * 8, h - 11, w);

	strncpy (st, name->string, sizeof (st));
	st[sizeof (st) - 1] = 0;
	SCR_DrawStringToSnap (st, newbuf, w - strlen (st) * 8, h - 21, w);

	WritePCXfile (pcxname, newbuf, w, h, w, host_basepal, true);

	free (newbuf);

	Con_Printf ("Wrote %s\n", pcxname);
}




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


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

char       *scr_notifystring;

void
SCR_DrawNotifyString (void)
{
	char       *start;
	int         l;
	int         j;
	int         x, y;

	start = scr_notifystring;

	y = vid.height * 0.35;

	do {
		// scan the width of the line
		for (l = 0; l < 40; l++)
			if (start[l] == '\n' || !start[l])
				break;
		x = (vid.width - l * 8) / 2;
		for (j = 0; j < l; j++, x += 8)
			Draw_Character8 (x, y, start[j]);

		y += 8;

		while (*start && *start != '\n')
			start++;

		if (!*start)
			break;
		start++;						// skip the \n
	} while (1);
}

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

void
SCR_TileClear (void)
{
	if (r_refdef.vrect.x > 0) {
		// left
		Draw_TileClear (0, 0, r_refdef.vrect.x, vid.height - sb_lines);
		// right
		Draw_TileClear (r_refdef.vrect.x + r_refdef.vrect.width, 0,
						vid.width - r_refdef.vrect.x + r_refdef.vrect.width,
						vid.height - sb_lines);
	}
	if (r_refdef.vrect.y > 0) {
		// top
		Draw_TileClear (r_refdef.vrect.x, 0,
						r_refdef.vrect.x + r_refdef.vrect.width,
						r_refdef.vrect.y);
		// bottom
		Draw_TileClear (r_refdef.vrect.x,
						r_refdef.vrect.y + r_refdef.vrect.height,
						r_refdef.vrect.width,
						vid.height - sb_lines -
						(r_refdef.vrect.height + r_refdef.vrect.y));
	}
}

int         oldviewsize = 0;
extern void R_ForceLightUpdate ();
qboolean    lighthalf;
unsigned char lighthalf_v[3];
extern cvar_t *gl_lightmode, *brightness, *contrast;

/*
	SCR_UpdateScreen

	This is called every frame, and can also be called explicitly to flush
	text to the screen.

	WARNING: be very careful calling this from elsewhere, because the refresh
	needs almost the entire 256k of stack space!
*/
void
SCR_UpdateScreen (void)
{
	double      time1 = 0, time2;
	float       f;

	if (block_drawing)
		return;

	vid.numpages = 2 + gl_triplebuffer->int_val;

	scr_copytop = 0;
	scr_copyeverything = 0;

	if (scr_disabled_for_loading) {
		if (realtime - scr_disabled_time > 60) {
			scr_disabled_for_loading = false;
			Con_Printf ("load failed.\n");
		} else {
			return;
		}
	}

	if (!scr_initialized || !con_initialized)	// not initialized yet
		return;

	if (oldsbar != cl_sbar->int_val) {
		oldsbar = cl_sbar->int_val;
		vid.recalc_refdef = true;
	}

	if (oldviewsize != scr_viewsize->int_val) {
		oldviewsize = scr_viewsize->int_val;
		vid.recalc_refdef = true;
	}

	GL_BeginRendering (&glx, &gly, &glwidth, &glheight);

	if (r_speeds->int_val) {
		time1 = Sys_DoubleTime ();
		c_brush_polys = 0;
		c_alias_polys = 0;
	}

	if (oldfov != scr_fov->value) {		// determine size of refresh window
		oldfov = scr_fov->value;
		vid.recalc_refdef = true;
	}

	if (vid.recalc_refdef)
		SCR_CalcRefdef ();

	// do 3D refresh drawing, and then update the screen

	if (lighthalf != gl_lightmode->int_val) {
		lighthalf = gl_lightmode->int_val;
		if (lighthalf)
			lighthalf_v[0] = lighthalf_v[1] = lighthalf_v[2] = 128;
		else
			lighthalf_v[0] = lighthalf_v[1] = lighthalf_v[2] = 255;
		R_ForceLightUpdate ();
	}

	SCR_SetUpToDrawConsole ();

	V_RenderView ();

	GL_Set2D ();

	// draw any areas not covered by the refresh
	SCR_TileClear ();

	if (r_netgraph->int_val)
		R_NetGraph ();

	if (cl.intermission == 1 && key_dest == key_game) {
		Sbar_IntermissionOverlay ();
	} else if (cl.intermission == 2 && key_dest == key_game) {
		Sbar_FinaleOverlay ();
		SCR_CheckDrawCenterString ();
	} else {
		if (crosshair->int_val)
			Draw_Crosshair ();

		SCR_DrawRam ();
		SCR_DrawNet ();
		SCR_DrawFPS ();
		SCR_DrawTime ();
		SCR_DrawTurtle ();
		SCR_DrawPause ();
		SCR_CheckDrawCenterString ();
		Sbar_Draw ();
		SCR_DrawConsole ();
		M_Draw ();
	}

	// LordHavoc: adjustable brightness and contrast,
	// also makes polyblend apply to whole screen
	glDisable (GL_TEXTURE_2D);

	Cvar_SetValue (brightness, bound (1, brightness->value, 5));
	if (lighthalf)						// LordHavoc: render was done at half 
										// 
		// brightness
		f = brightness->value * 2;
	else
		f = brightness->value;
	if (f >= 1.002) {					// Make sure we don't get bit by
		// roundoff errors
		glBlendFunc (GL_DST_COLOR, GL_ONE);
		glBegin (GL_QUADS);
		while (f >= 1.002) {			// precision
			if (f >= 2)
				glColor3f (1, 1, 1);
			else
				glColor3f (f - 1, f - 1, f - 1);
			glVertex2f (0, 0);
			glVertex2f (vid.width, 0);
			glVertex2f (vid.width, vid.height);
			glVertex2f (0, vid.height);
			f *= 0.5;
		}
		glEnd ();
		glColor3ubv (lighthalf_v);
		glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	}
	Cvar_SetValue (contrast, bound (0.0, contrast->value, 1.0));
	if (v_blend[3] || (contrast->value < 0.999)) {	// precision
		glBegin (GL_QUADS);
		if (contrast->value < 0.999) {	// precision
			glColor4f (0.5, 0.5, 0.5, (1 - contrast->value));
			glVertex2f (0, 0);
			glVertex2f (vid.width, 0);
			glVertex2f (vid.width, vid.height);
			glVertex2f (0, vid.height);
		}

		if (v_blend[3]) {
			glColor4fv (v_blend);
			glVertex2f (0, 0);
			glVertex2f (vid.width, 0);
			glVertex2f (vid.width, vid.height);
			glVertex2f (0, vid.height);
		}
		glEnd ();
		glColor3ubv (lighthalf_v);
	}

	glEnable (GL_TEXTURE_2D);

	V_UpdatePalette ();

	if (r_speeds->int_val) {
//      glFinish ();
		time2 = Sys_DoubleTime ();
		Con_Printf ("%3i ms  %4i wpoly %4i epoly\n",
					(int) ((time2 - time1) * 1000), c_brush_polys,
					c_alias_polys);
	}

	glFinish ();
	GL_EndRendering ();
}