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/*

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.

*/

// screen.c -- master for refresh, status bar, console, chat, notify, etc

#include "quakedef.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

float		oldscreensize, oldfov;

cvar_t		scr_viewsize = {"viewsize","100", true};

cvar_t		scr_fov = {"fov","90"};	// 10 - 170

cvar_t		scr_conspeed = {"scr_conspeed","300"};

cvar_t		scr_centertime = {"scr_centertime","2"};

cvar_t		scr_showram = {"showram","1"};

cvar_t		scr_showturtle = {"showturtle","0"};

cvar_t		scr_showpause = {"showpause","1"};

cvar_t		scr_printspeed = {"scr_printspeed","8"};

cvar_t		gl_triplebuffer = {"gl_triplebuffer", "1", true };

extern	cvar_t	crosshair;

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;

int			sb_lines;

viddef_t	vid;				// global video state

vrect_t		scr_vrect;

qboolean	scr_disabled_for_loading;

qboolean	scr_drawloading;

float		scr_disabled_time;

qboolean	block_drawing;

void SCR_ScreenShot_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

		{

			Draw_Character (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 = atan (height/x);

        a = a*360/M_PI;

        return a;

}

/*

=================

SCR_CalcRefdef

Must be called whenever vid changes

Internal use only

=================

*/

static void SCR_CalcRefdef (void)

{

	vrect_t		vrect;

	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

	if (scr_viewsize.value < 30)

		Cvar_Set ("viewsize","30");

	if (scr_viewsize.value > 120)

		Cvar_Set ("viewsize","120");

// bound field of view

	if (scr_fov.value < 10)

		Cvar_Set ("fov","10");

	if (scr_fov.value > 170)

		Cvar_Set ("fov","170");

// intermission is always full screen

	if (cl.intermission)

		size = 120;

	else

		size = scr_viewsize.value;

	if (size >= 120)

		sb_lines = 0;		// no status bar at all

	else if (size >= 110)

		sb_lines = 24;		// no inventory

	else

		sb_lines = 24+16+8;

	if (scr_viewsize.value >= 100.0) {

		full = true;

		size = 100.0;

	} else

		size = scr_viewsize.value;

	if (cl.intermission)

	{

		full = true;

		size = 100;

		sb_lines = 0;

	}

	size /= 100.0;

	h = vid.height - sb_lines;

	r_refdef.vrect.width = vid.width * size;

	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;

	if (r_refdef.vrect.height > vid.height - sb_lines)

		r_refdef.vrect.height = vid.height - sb_lines;

	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.value;

	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)

{

	Cvar_SetValue ("viewsize",scr_viewsize.value+10);

	vid.recalc_refdef = 1;

}

/*

=================

SCR_SizeDown_f

Keybinding command

=================

*/

void SCR_SizeDown_f (void)

{

	Cvar_SetValue ("viewsize",scr_viewsize.value-10);

	vid.recalc_refdef = 1;

}

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

/*

==================

SCR_Init

==================

*/

void SCR_Init (void)

{

	Cvar_RegisterVariable (&scr_fov);

	Cvar_RegisterVariable (&scr_viewsize);

	Cvar_RegisterVariable (&scr_conspeed);

	Cvar_RegisterVariable (&scr_showram);

	Cvar_RegisterVariable (&scr_showturtle);

	Cvar_RegisterVariable (&scr_showpause);

	Cvar_RegisterVariable (&scr_centertime);

	Cvar_RegisterVariable (&scr_printspeed);

	Cvar_RegisterVariable (&gl_triplebuffer);

//

// register our commands

//

	Cmd_AddCommand ("screenshot",SCR_ScreenShot_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.value)

		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.value)

		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 (realtime - cl.last_received_message < 0.3)

		return;

	if (cls.demoplayback)

		return;

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

}

/*

==============

DrawPause

==============

*/

void SCR_DrawPause (void)

{

	qpic_t	*pic;

	if (!scr_showpause.value)		// 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_DrawLoading

==============

*/

void SCR_DrawLoading (void)

{

	qpic_t	*pic;

	if (!scr_drawloading)

		return;

	pic = Draw_CachePic ("gfx/loading.lmp");

	Draw_Pic ( (vid.width - pic->width)/2,

		(vid.height - 48 - pic->height)/2, pic);

}

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

/*

==================

SCR_SetUpToDrawConsole

==================

*/

void SCR_SetUpToDrawConsole (void)

{

	Con_CheckResize ();

	if (scr_drawloading)

		return;		// never a console with loading plaque

// decide on the height of the console

	con_forcedup = !cl.worldmodel || cls.signon != SIGNONS;

	if (con_forcedup)

	{

		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, true);

		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, c, temp;

//

// find a file name to save it to

//

	strcpy(pcxname,"quake00.tga");

	for (i=0 ; i<=99 ; i++)

	{

		pcxname[5] = i/10 + '0';

		pcxname[6] = i%10 + '0';

		sprintf (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 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_RGB, GL_UNSIGNED_BYTE, buffer+18 );

	// swap rgb to bgr

	c = 18+glwidth*glheight*3;

	for (i=18 ; i

	{

		temp = buffer[i];

		buffer[i] = buffer[i+2];

		buffer[i+2] = temp;

	}

	COM_WriteFile (pcxname, buffer, glwidth*glheight*3 + 18 );

	free (buffer);

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

}

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

/*

===============

SCR_BeginLoadingPlaque

================

*/

void SCR_BeginLoadingPlaque (void)

{

	S_StopAllSounds (true);

	if (cls.state != ca_connected)

		return;

	if (cls.signon != SIGNONS)

		return;

// redraw with no console and the loading plaque

	Con_ClearNotify ();

	scr_centertime_off = 0;

	scr_con_current = 0;

	scr_drawloading = true;

	scr_fullupdate = 0;

	Sbar_Changed ();

	SCR_UpdateScreen ();

	scr_drawloading = false;

	scr_disabled_for_loading = true;

	scr_disabled_time = realtime;

	scr_fullupdate = 0;

}

/*

===============

SCR_EndLoadingPlaque

================

*/

void SCR_EndLoadingPlaque (void)

{

	scr_disabled_for_loading = false;

	scr_fullupdate = 0;

	Con_ClearNotify ();

}

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

char	*scr_notifystring;

qboolean	scr_drawdialog;

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

			Draw_Character (x, y, start[j]);

		y += 8;

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

			start++;

		if (!*start)

			break;

		start++;		// skip the \n

	} while (1);

}

/*

==================

SCR_ModalMessage

Displays a text string in the center of the screen and waits for a Y or N

keypress.

==================

*/

int SCR_ModalMessage (char *text)

{

	if (cls.state == ca_dedicated)

		return true;

	scr_notifystring = text;

// draw a fresh screen

	scr_fullupdate = 0;

	scr_drawdialog = true;

	SCR_UpdateScreen ();

	scr_drawdialog = false;

	S_ClearBuffer ();		// so dma doesn't loop current sound

	do

	{

		key_count = -1;		// wait for a key down and up

		Sys_SendKeyEvents ();

	} while (key_lastpress != 'y' && key_lastpress != 'n' && key_lastpress != K_ESCAPE);

	scr_fullupdate = 0;

	SCR_UpdateScreen ();

	return key_lastpress == 'y';

}

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

/*

===============

SCR_BringDownConsole

Brings the console down and fades the palettes back to normal

================

*/

void SCR_BringDownConsole (void)

{

	int		i;

	scr_centertime_off = 0;

	for (i=0 ; i<20 && scr_conlines != scr_con_current ; i++)

		SCR_UpdateScreen ();

	cl.cshifts[0].percent = 0;		// no area contents palette on next frame

	VID_SetPalette (host_basepal);

}

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));

	}

}

/*

==================

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)

{

	static float	oldscr_viewsize;

	vrect_t		vrect;

	if (block_drawing)

		return;

	vid.numpages = 2 + gl_triplebuffer.value;

	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)

		return;				// not initialized yet

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

	//

	// determine size of refresh window

	//

	if (oldfov != scr_fov.value)

	{

		oldfov = scr_fov.value;

		vid.recalc_refdef = true;

	}

	if (oldscreensize != scr_viewsize.value)

	{

		oldscreensize = scr_viewsize.value;

		vid.recalc_refdef = true;

	}

	if (vid.recalc_refdef)

		SCR_CalcRefdef ();

//

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

//

	SCR_SetUpToDrawConsole ();

	V_RenderView ();

	GL_Set2D ();

	//

	// draw any areas not covered by the refresh

	//

	SCR_TileClear ();

	if (scr_drawdialog)

	{

		Sbar_Draw ();

		Draw_FadeScreen ();

		SCR_DrawNotifyString ();

		scr_copyeverything = true;

	}

	else if (scr_drawloading)

	{

		SCR_DrawLoading ();

		Sbar_Draw ();

	}

	else 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.value)

			Draw_Character (scr_vrect.x + scr_vrect.width/2, scr_vrect.y + scr_vrect.height/2, '+');

		SCR_DrawRam ();

		SCR_DrawNet ();

		SCR_DrawTurtle ();

		SCR_DrawPause ();

		SCR_CheckDrawCenterString ();

		Sbar_Draw ();

		SCR_DrawConsole ();

		M_Draw ();

	}

	V_UpdatePalette ();

	GL_EndRendering ();

}