/*
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.

*/
// gl_ngraph.c

#include "quakedef.h"

extern byte   *draw_chars;        // 8*8 graphic characters

int netgraphtexture;  // netgraph texture

#define NET_GRAPHHEIGHT 32

static  byte ngraph_texels[NET_GRAPHHEIGHT][NET_TIMINGS];

static void R_LineGraph (int x, int h)
{
  int   i;
  int   s;
  int   color;

  s = NET_GRAPHHEIGHT;

  if (h == 10000)
    color = 0x6f; // yellow
  else if (h == 9999)
    color = 0x4f; // red
  else if (h == 9998)
    color = 0xd0; // blue
  else
    color = 0xfe; // white

  if (h>s)
    h = s;
  
  for (i=0 ; i<h ; i++)
    if (i & 1)
      ngraph_texels[NET_GRAPHHEIGHT - i - 1][x] = 0xff;
    else
      ngraph_texels[NET_GRAPHHEIGHT - i - 1][x] = (byte)color;

  for ( ; i<s ; i++)
    ngraph_texels[NET_GRAPHHEIGHT - i - 1][x] = (byte)0xff;
}

void Draw_CharToNetGraph (int x, int y, int num)
{
  int   row, col;
  byte  *source;
  int   drawline;
  int   nx;

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

  for (drawline = 8; drawline; drawline--, y++)
  {
    for (nx=0 ; nx<8 ; nx++)
      if (source[nx] != 255)
        ngraph_texels[y][nx+x] = 0x60 + source[nx];
    source += 128;
  }
}


/*
==============
R_NetGraph
==============
*/
void R_NetGraph (void)
{
  int   a, x, i, y;
  int lost;
  char st[80];
  unsigned  ngraph_pixels[NET_GRAPHHEIGHT][NET_TIMINGS];

  x = 0;
  lost = CL_CalcNet();
  for (a=0 ; a<NET_TIMINGS ; a++)
  {
    i = (cls.netchan.outgoing_sequence-a) & NET_TIMINGSMASK;
    R_LineGraph (NET_TIMINGS-1-a, packet_latency[i]);
  }

  // now load the netgraph texture into gl and draw it
  for (y = 0; y < NET_GRAPHHEIGHT; y++)
    for (x = 0; x < NET_TIMINGS; x++)
      ngraph_pixels[y][x] = d_8to24table[ngraph_texels[y][x]];

  x = -((vid.width - 320)>>1);
  y = vid.height - sb_lines - 24 - NET_GRAPHHEIGHT - 1;

  M_DrawTextBox (x, y, NET_TIMINGS/8, NET_GRAPHHEIGHT/8 + 1);
  y += 8;

  sprintf(st, "%3i%% packet loss", lost);
  Draw_String(8, y, st);
  y += 8;
  
    GL_Bind(netgraphtexture);

  glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, 
    NET_TIMINGS, NET_GRAPHHEIGHT, 0, GL_RGBA, 
    GL_UNSIGNED_BYTE, ngraph_pixels);

  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  x = 8;
  glColor3f (1,1,1);
  glBegin (GL_QUADS);
  glTexCoord2f (0, 0);
  glVertex2f (x, y);
  glTexCoord2f (1, 0);
  glVertex2f (x+NET_TIMINGS, y);
  glTexCoord2f (1, 1);
  glVertex2f (x+NET_TIMINGS, y+NET_GRAPHHEIGHT);
  glTexCoord2f (0, 1);
  glVertex2f (x, y+NET_GRAPHHEIGHT);
  glEnd ();
}