/*
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<l ; j++, x+=8)
    {
      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<c ; i+=3)
  {
    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<l ; j++, x+=8)
      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 ();
}