/*
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"
#include "gl_local.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, s, 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

	h = min(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) {
	byte *source;
	int row, col, drawline, 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;
	}
}

void R_NetGraph (void) {
	int a, x, i, y, 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 =	0;
	y = vid.height - sb_lines - 24 - NET_GRAPHHEIGHT - 1;

	if (r_netgraph.value != 2 && r_netgraph.value != 3)
		Draw_TextBox (x, y, NET_TIMINGS / 8, NET_GRAPHHEIGHT / 8 + 1);

	if (r_netgraph.value != 3) {
		sprintf (st, "%3i%% packet loss", lost);
		Draw_String (8, y + 8, st);
	}

	x = 8;
	y += 16;

    GL_Bind(netgraphtexture);

	glTexImage2D (GL_TEXTURE_2D, 0, 4, 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);

	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 ();
}
