/*
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.

*/

// draw.c -- this is the only file outside the refresh that touches the
// vid buffer

#include "quakedef.h"

typedef struct {
  vrect_t rect;
  int   width;
  int   height;
  byte  *ptexbytes;
  int   rowbytes;
} rectdesc_t;

static rectdesc_t r_rectdesc;

byte    *draw_chars;        // 8*8 graphic characters
qpic_t    *draw_disc;
qpic_t    *draw_backtile;

//=============================================================================
/* Support Routines */

typedef struct cachepic_s
{
  char    name[MAX_QPATH];
  cache_user_t  cache;
} cachepic_t;

#define MAX_CACHED_PICS   128
cachepic_t  menu_cachepics[MAX_CACHED_PICS];
int     menu_numcachepics;


qpic_t  *Draw_PicFromWad (char *name)
{
  return W_GetLumpName (name);
}

/*
================
Draw_CachePic
================
*/
qpic_t  *Draw_CachePic (char *path)
{
  cachepic_t  *pic;
  int     i;
  qpic_t    *dat;
  
  for (pic=menu_cachepics, i=0 ; i<menu_numcachepics ; pic++, i++)
    if (!strcmp (path, pic->name))
      break;

  if (i == menu_numcachepics)
  {
    if (menu_numcachepics == MAX_CACHED_PICS)
      Sys_Error ("menu_numcachepics == MAX_CACHED_PICS");
    menu_numcachepics++;
    strcpy (pic->name, path);
  }

  dat = Cache_Check (&pic->cache);

  if (dat)
    return dat;

//
// load the pic from disk
//
  COM_LoadCacheFile (path, &pic->cache);
  
  dat = (qpic_t *)pic->cache.data;
  if (!dat)
  {
    Sys_Error ("Draw_CachePic: failed to load %s", path);
  }

  SwapPic (dat);

  return dat;
}



/*
===============
Draw_Init
===============
*/
void Draw_Init (void)
{
  int   i;

  draw_chars = W_GetLumpName ("conchars");
  draw_disc = W_GetLumpName ("disc");
  draw_backtile = W_GetLumpName ("backtile");

  r_rectdesc.width = draw_backtile->width;
  r_rectdesc.height = draw_backtile->height;
  r_rectdesc.ptexbytes = draw_backtile->data;
  r_rectdesc.rowbytes = draw_backtile->width;
}



/*
================
Draw_Character

Draws one 8*8 graphics character with 0 being transparent.
It can be clipped to the top of the screen to allow the console to be
smoothly scrolled off.
================
*/
void Draw_Character (int x, int y, int num)
{
  byte      *dest;
  byte      *source;
  unsigned short  *pusdest;
  int       drawline; 
  int       row, col;

  num &= 255;
  
  if (y <= -8)
    return;     // totally off screen

#ifdef PARANOID
  if (y > vid.height - 8 || x < 0 || x > vid.width - 8)
    Sys_Error ("Con_DrawCharacter: (%i, %i)", x, y);
  if (num < 0 || num > 255)
    Sys_Error ("Con_DrawCharacter: char %i", num);
#endif

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

  if (y < 0)
  { // clipped
    drawline = 8 + y;
    source -= 128*y;
    y = 0;
  }
  else
    drawline = 8;


  if (r_pixbytes == 1)
  {
    dest = vid.conbuffer + y*vid.conrowbytes + x;
  
    while (drawline--)
    {
      if (source[0])
        dest[0] = source[0];
      if (source[1])
        dest[1] = source[1];
      if (source[2])
        dest[2] = source[2];
      if (source[3])
        dest[3] = source[3];
      if (source[4])
        dest[4] = source[4];
      if (source[5])
        dest[5] = source[5];
      if (source[6])
        dest[6] = source[6];
      if (source[7])
        dest[7] = source[7];
      source += 128;
      dest += vid.conrowbytes;
    }
  }
  else
  {
  // FIXME: pre-expand to native format?
    pusdest = (unsigned short *)
        ((byte *)vid.conbuffer + y*vid.conrowbytes + (x<<1));

    while (drawline--)
    {
      if (source[0])
        pusdest[0] = d_8to16table[source[0]];
      if (source[1])
        pusdest[1] = d_8to16table[source[1]];
      if (source[2])
        pusdest[2] = d_8to16table[source[2]];
      if (source[3])
        pusdest[3] = d_8to16table[source[3]];
      if (source[4])
        pusdest[4] = d_8to16table[source[4]];
      if (source[5])
        pusdest[5] = d_8to16table[source[5]];
      if (source[6])
        pusdest[6] = d_8to16table[source[6]];
      if (source[7])
        pusdest[7] = d_8to16table[source[7]];

      source += 128;
      pusdest += (vid.conrowbytes >> 1);
    }
  }
}

/*
================
Draw_String
================
*/
void Draw_String (int x, int y, char *str)
{
  while (*str)
  {
    Draw_Character (x, y, *str);
    str++;
    x += 8;
  }
}

/*
================
Draw_DebugChar

Draws a single character directly to the upper right corner of the screen.
This is for debugging lockups by drawing different chars in different parts
of the code.
================
*/
void Draw_DebugChar (char num)
{
  byte      *dest;
  byte      *source;
  int       drawline; 
  extern byte   *draw_chars;
  int       row, col;

  if (!vid.direct)
    return;   // don't have direct FB access, so no debugchars...

  drawline = 8;

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

  dest = vid.direct + 312;

  while (drawline--)
  {
    dest[0] = source[0];
    dest[1] = source[1];
    dest[2] = source[2];
    dest[3] = source[3];
    dest[4] = source[4];
    dest[5] = source[5];
    dest[6] = source[6];
    dest[7] = source[7];
    source += 128;
    dest += 320;
  }
}

/*
=============
Draw_Pic
=============
*/
void Draw_Pic (int x, int y, qpic_t *pic)
{
  byte      *dest, *source;
  unsigned short  *pusdest;
  int       v, u;

  if ((x < 0) ||
    (x + pic->width > vid.width) ||
    (y < 0) ||
    (y + pic->height > vid.height))
  {
    Sys_Error ("Draw_Pic: bad coordinates");
  }

  source = pic->data;

  if (r_pixbytes == 1)
  {
    dest = vid.buffer + y * vid.rowbytes + x;

    for (v=0 ; v<pic->height ; v++)
    {
      Q_memcpy (dest, source, pic->width);
      dest += vid.rowbytes;
      source += pic->width;
    }
  }
  else
  {
  // FIXME: pretranslate at load time?
    pusdest = (unsigned short *)vid.buffer + y * (vid.rowbytes >> 1) + x;

    for (v=0 ; v<pic->height ; v++)
    {
      for (u=0 ; u<pic->width ; u++)
      {
        pusdest[u] = d_8to16table[source[u]];
      }

      pusdest += vid.rowbytes >> 1;
      source += pic->width;
    }
  }
}


/*
=============
Draw_TransPic
=============
*/
void Draw_TransPic (int x, int y, qpic_t *pic)
{
  byte  *dest, *source, tbyte;
  unsigned short  *pusdest;
  int       v, u;

  if (x < 0 || (unsigned)(x + pic->width) > vid.width || y < 0 ||
     (unsigned)(y + pic->height) > vid.height)
  {
    Sys_Error ("Draw_TransPic: bad coordinates");
  }
    
  source = pic->data;

  if (r_pixbytes == 1)
  {
    dest = vid.buffer + y * vid.rowbytes + x;

    if (pic->width & 7)
    { // general
      for (v=0 ; v<pic->height ; v++)
      {
        for (u=0 ; u<pic->width ; u++)
          if ( (tbyte=source[u]) != TRANSPARENT_COLOR)
            dest[u] = tbyte;
  
        dest += vid.rowbytes;
        source += pic->width;
      }
    }
    else
    { // unwound
      for (v=0 ; v<pic->height ; v++)
      {
        for (u=0 ; u<pic->width ; u+=8)
        {
          if ( (tbyte=source[u]) != TRANSPARENT_COLOR)
            dest[u] = tbyte;
          if ( (tbyte=source[u+1]) != TRANSPARENT_COLOR)
            dest[u+1] = tbyte;
          if ( (tbyte=source[u+2]) != TRANSPARENT_COLOR)
            dest[u+2] = tbyte;
          if ( (tbyte=source[u+3]) != TRANSPARENT_COLOR)
            dest[u+3] = tbyte;
          if ( (tbyte=source[u+4]) != TRANSPARENT_COLOR)
            dest[u+4] = tbyte;
          if ( (tbyte=source[u+5]) != TRANSPARENT_COLOR)
            dest[u+5] = tbyte;
          if ( (tbyte=source[u+6]) != TRANSPARENT_COLOR)
            dest[u+6] = tbyte;
          if ( (tbyte=source[u+7]) != TRANSPARENT_COLOR)
            dest[u+7] = tbyte;
        }
        dest += vid.rowbytes;
        source += pic->width;
      }
    }
  }
  else
  {
  // FIXME: pretranslate at load time?
    pusdest = (unsigned short *)vid.buffer + y * (vid.rowbytes >> 1) + x;

    for (v=0 ; v<pic->height ; v++)
    {
      for (u=0 ; u<pic->width ; u++)
      {
        tbyte = source[u];

        if (tbyte != TRANSPARENT_COLOR)
        {
          pusdest[u] = d_8to16table[tbyte];
        }
      }

      pusdest += vid.rowbytes >> 1;
      source += pic->width;
    }
  }
}


/*
=============
Draw_TransPicTranslate
=============
*/
void Draw_TransPicTranslate (int x, int y, qpic_t *pic, byte *translation)
{
  byte  *dest, *source, tbyte;
  unsigned short  *pusdest;
  int       v, u;

  if (x < 0 || (unsigned)(x + pic->width) > vid.width || y < 0 ||
     (unsigned)(y + pic->height) > vid.height)
  {
    Sys_Error ("Draw_TransPic: bad coordinates");
  }
    
  source = pic->data;

  if (r_pixbytes == 1)
  {
    dest = vid.buffer + y * vid.rowbytes + x;

    if (pic->width & 7)
    { // general
      for (v=0 ; v<pic->height ; v++)
      {
        for (u=0 ; u<pic->width ; u++)
          if ( (tbyte=source[u]) != TRANSPARENT_COLOR)
            dest[u] = translation[tbyte];

        dest += vid.rowbytes;
        source += pic->width;
      }
    }
    else
    { // unwound
      for (v=0 ; v<pic->height ; v++)
      {
        for (u=0 ; u<pic->width ; u+=8)
        {
          if ( (tbyte=source[u]) != TRANSPARENT_COLOR)
            dest[u] = translation[tbyte];
          if ( (tbyte=source[u+1]) != TRANSPARENT_COLOR)
            dest[u+1] = translation[tbyte];
          if ( (tbyte=source[u+2]) != TRANSPARENT_COLOR)
            dest[u+2] = translation[tbyte];
          if ( (tbyte=source[u+3]) != TRANSPARENT_COLOR)
            dest[u+3] = translation[tbyte];
          if ( (tbyte=source[u+4]) != TRANSPARENT_COLOR)
            dest[u+4] = translation[tbyte];
          if ( (tbyte=source[u+5]) != TRANSPARENT_COLOR)
            dest[u+5] = translation[tbyte];
          if ( (tbyte=source[u+6]) != TRANSPARENT_COLOR)
            dest[u+6] = translation[tbyte];
          if ( (tbyte=source[u+7]) != TRANSPARENT_COLOR)
            dest[u+7] = translation[tbyte];
        }
        dest += vid.rowbytes;
        source += pic->width;
      }
    }
  }
  else
  {
  // FIXME: pretranslate at load time?
    pusdest = (unsigned short *)vid.buffer + y * (vid.rowbytes >> 1) + x;

    for (v=0 ; v<pic->height ; v++)
    {
      for (u=0 ; u<pic->width ; u++)
      {
        tbyte = source[u];

        if (tbyte != TRANSPARENT_COLOR)
        {
          pusdest[u] = d_8to16table[tbyte];
        }
      }

      pusdest += vid.rowbytes >> 1;
      source += pic->width;
    }
  }
}


void Draw_CharToConback (int num, byte *dest)
{
  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] = 0x60 + source[x];
    source += 128;
    dest += 320;
  }

}

/*
================
Draw_ConsoleBackground

================
*/
void Draw_ConsoleBackground (int lines)
{
  int       x, y, v;
  byte      *src, *dest;
  unsigned short  *pusdest;
  int       f, fstep;
  qpic_t      *conback;
  char      ver[100];

  conback = Draw_CachePic ("gfx/conback.lmp");

// hack the version number directly into the pic
#ifdef _WIN32
  sprintf (ver, "(WinQuake) %4.2f", (float)VERSION);
  dest = conback->data + 320*186 + 320 - 11 - 8*strlen(ver);
#elif defined(X11)
  sprintf (ver, "(X11 Quake %2.2f) %4.2f", (float)X11_VERSION, (float)VERSION);
  dest = conback->data + 320*186 + 320 - 11 - 8*strlen(ver);
#elif defined(__linux__)
  sprintf (ver, "(Linux Quake %2.2f) %4.2f", (float)LINUX_VERSION, (float)VERSION);
  dest = conback->data + 320*186 + 320 - 11 - 8*strlen(ver);
#else
  dest = conback->data + 320 - 43 + 320*186;
  sprintf (ver, "%4.2f", VERSION);
#endif

  for (x=0 ; x<strlen(ver) ; x++)
    Draw_CharToConback (ver[x], dest+(x<<3));
  
// draw the pic
  if (r_pixbytes == 1)
  {
    dest = vid.conbuffer;

    for (y=0 ; y<lines ; y++, dest += vid.conrowbytes)
    {
      v = (vid.conheight - lines + y)*200/vid.conheight;
      src = conback->data + v*320;
      if (vid.conwidth == 320)
        memcpy (dest, src, vid.conwidth);
      else
      {
        f = 0;
        fstep = 320*0x10000/vid.conwidth;
        for (x=0 ; x<vid.conwidth ; x+=4)
        {
          dest[x] = src[f>>16];
          f += fstep;
          dest[x+1] = src[f>>16];
          f += fstep;
          dest[x+2] = src[f>>16];
          f += fstep;
          dest[x+3] = src[f>>16];
          f += fstep;
        }
      }
    }
  }
  else
  {
    pusdest = (unsigned short *)vid.conbuffer;

    for (y=0 ; y<lines ; y++, pusdest += (vid.conrowbytes >> 1))
    {
    // FIXME: pre-expand to native format?
    // FIXME: does the endian switching go away in production?
      v = (vid.conheight - lines + y)*200/vid.conheight;
      src = conback->data + v*320;
      f = 0;
      fstep = 320*0x10000/vid.conwidth;
      for (x=0 ; x<vid.conwidth ; x+=4)
      {
        pusdest[x] = d_8to16table[src[f>>16]];
        f += fstep;
        pusdest[x+1] = d_8to16table[src[f>>16]];
        f += fstep;
        pusdest[x+2] = d_8to16table[src[f>>16]];
        f += fstep;
        pusdest[x+3] = d_8to16table[src[f>>16]];
        f += fstep;
      }
    }
  }
}


/*
==============
R_DrawRect8
==============
*/
void R_DrawRect8 (vrect_t *prect, int rowbytes, byte *psrc,
  int transparent)
{
  byte  t;
  int   i, j, srcdelta, destdelta;
  byte  *pdest;

  pdest = vid.buffer + (prect->y * vid.rowbytes) + prect->x;

  srcdelta = rowbytes - prect->width;
  destdelta = vid.rowbytes - prect->width;

  if (transparent)
  {
    for (i=0 ; i<prect->height ; i++)
    {
      for (j=0 ; j<prect->width ; j++)
      {
        t = *psrc;
        if (t != TRANSPARENT_COLOR)
        {
          *pdest = t;
        }

        psrc++;
        pdest++;
      }

      psrc += srcdelta;
      pdest += destdelta;
    }
  }
  else
  {
    for (i=0 ; i<prect->height ; i++)
    {
      memcpy (pdest, psrc, prect->width);
      psrc += rowbytes;
      pdest += vid.rowbytes;
    }
  }
}


/*
==============
R_DrawRect16
==============
*/
void R_DrawRect16 (vrect_t *prect, int rowbytes, byte *psrc,
  int transparent)
{
  byte      t;
  int       i, j, srcdelta, destdelta;
  unsigned short  *pdest;

// FIXME: would it be better to pre-expand native-format versions?

  pdest = (unsigned short *)vid.buffer +
      (prect->y * (vid.rowbytes >> 1)) + prect->x;

  srcdelta = rowbytes - prect->width;
  destdelta = (vid.rowbytes >> 1) - prect->width;

  if (transparent)
  {
    for (i=0 ; i<prect->height ; i++)
    {
      for (j=0 ; j<prect->width ; j++)
      {
        t = *psrc;
        if (t != TRANSPARENT_COLOR)
        {
          *pdest = d_8to16table[t];
        }

        psrc++;
        pdest++;
      }

      psrc += srcdelta;
      pdest += destdelta;
    }
  }
  else
  {
    for (i=0 ; i<prect->height ; i++)
    {
      for (j=0 ; j<prect->width ; j++)
      {
        *pdest = d_8to16table[*psrc];
        psrc++;
        pdest++;
      }

      psrc += srcdelta;
      pdest += destdelta;
    }
  }
}


/*
=============
Draw_TileClear

This repeats a 64*64 tile graphic to fill the screen around a sized down
refresh window.
=============
*/
void Draw_TileClear (int x, int y, int w, int h)
{
  int       width, height, tileoffsetx, tileoffsety;
  byte      *psrc;
  vrect_t     vr;

  r_rectdesc.rect.x = x;
  r_rectdesc.rect.y = y;
  r_rectdesc.rect.width = w;
  r_rectdesc.rect.height = h;

  vr.y = r_rectdesc.rect.y;
  height = r_rectdesc.rect.height;

  tileoffsety = vr.y % r_rectdesc.height;

  while (height > 0)
  {
    vr.x = r_rectdesc.rect.x;
    width = r_rectdesc.rect.width;

    if (tileoffsety != 0)
      vr.height = r_rectdesc.height - tileoffsety;
    else
      vr.height = r_rectdesc.height;

    if (vr.height > height)
      vr.height = height;

    tileoffsetx = vr.x % r_rectdesc.width;

    while (width > 0)
    {
      if (tileoffsetx != 0)
        vr.width = r_rectdesc.width - tileoffsetx;
      else
        vr.width = r_rectdesc.width;

      if (vr.width > width)
        vr.width = width;

      psrc = r_rectdesc.ptexbytes +
          (tileoffsety * r_rectdesc.rowbytes) + tileoffsetx;

      if (r_pixbytes == 1)
      {
        R_DrawRect8 (&vr, r_rectdesc.rowbytes, psrc, 0);
      }
      else
      {
        R_DrawRect16 (&vr, r_rectdesc.rowbytes, psrc, 0);
      }

      vr.x += vr.width;
      width -= vr.width;
      tileoffsetx = 0;  // only the left tile can be left-clipped
    }

    vr.y += vr.height;
    height -= vr.height;
    tileoffsety = 0;    // only the top tile can be top-clipped
  }
}


/*
=============
Draw_Fill

Fills a box of pixels with a single color
=============
*/
void Draw_Fill (int x, int y, int w, int h, int c)
{
  byte      *dest;
  unsigned short  *pusdest;
  unsigned    uc;
  int       u, v;

  if (r_pixbytes == 1)
  {
    dest = vid.buffer + y*vid.rowbytes + x;
    for (v=0 ; v<h ; v++, dest += vid.rowbytes)
      for (u=0 ; u<w ; u++)
        dest[u] = c;
  }
  else
  {
    uc = d_8to16table[c];

    pusdest = (unsigned short *)vid.buffer + y * (vid.rowbytes >> 1) + x;
    for (v=0 ; v<h ; v++, pusdest += (vid.rowbytes >> 1))
      for (u=0 ; u<w ; u++)
        pusdest[u] = uc;
  }
}
//=============================================================================

/*
================
Draw_FadeScreen

================
*/
void Draw_FadeScreen (void)
{
  int     x,y;
  byte    *pbuf;

  VID_UnlockBuffer ();
  S_ExtraUpdate ();
  VID_LockBuffer ();

  for (y=0 ; y<vid.height ; y++)
  {
    int t;

    pbuf = (byte *)(vid.buffer + vid.rowbytes*y);
    t = (y & 1) << 1;

    for (x=0 ; x<vid.width ; x++)
    {
      if ((x & 3) != t)
        pbuf[x] = 0;
    }
  }

  VID_UnlockBuffer ();
  S_ExtraUpdate ();
  VID_LockBuffer ();
}

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

/*
================
Draw_BeginDisc

Draws the little blue disc in the corner of the screen.
Call before beginning any disc IO.
================
*/
void Draw_BeginDisc (void)
{

  D_BeginDirectRect (vid.width - 24, 0, draw_disc->data, 24, 24);
}


/*
================
Draw_EndDisc

Erases the disc icon.
Call after completing any disc IO
================
*/
void Draw_EndDisc (void)
{

  D_EndDirectRect (vid.width - 24, 0, 24, 24);
}