The Quake 2 tools as originally released under the GPL license.

qdata/tables.c

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+/*
+===========================================================================
+Copyright (C) 1997-2006 Id Software, Inc.
+
+This file is part of Quake 2 Tools source code.
+
+Quake 2 Tools source code 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.
+
+Quake 2 Tools source code 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 Quake 2 Tools source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+
+#include "qdata.h"
+
+/*
+=============================================================================
+
+ALPHALIGHT GENERATION
+
+Find alphamap values that best match modulated lightmap values
+
+This isn't used anymore, but I'm keeping it around...
+=============================================================================
+*/
+
+unsigned short	alphamap[32*32*32];
+unsigned char	inverse16to8table[65536];
+
+/*
+static int FindNearestColor( unsigned int color )
+{
+	int i;
+	int closest_so_far = 0;
+	float closest_distance_so_far = 100000000;
+	float d;
+	float r[2], g[2], b[2];
+
+	// incoming color is assumed to be in 0xRRGGBB format
+	r[0] = ( color & 31 ) << 3;
+	g[0] = ( ( color >> 5 ) & 63 ) << 2;
+	b[0] = ( ( color >> 11 ) & 31 ) << 3;
+
+	for ( i = 0; i < 256; i++ )
+	{
+		r[1] = ( d_8to24table[i] >> 0 ) & 0xFF;
+		g[1] = ( d_8to24table[i] >> 8 ) & 0xFF;
+		b[1] = ( d_8to24table[i] >> 16 ) & 0xFF;
+
+		d = ( r[1] - r[0] ) * ( r[1] - r[0] ) +
+			( g[1] - g[0] ) * ( g[1] - g[0] ) +
+			( b[1] - b[0] ) * ( b[1] - b[0] );
+
+		if ( d < closest_distance_so_far )
+		{
+			closest_distance_so_far = d;
+			closest_so_far = i;
+		}
+	}
+
+	return closest_so_far;
+}
+*/
+
+extern byte BestColor( int, int, int, int, int );
+
+void Inverse16_BuildTable( void )
+{
+	int i;
+
+	/*
+	** create the 16-to-8 table
+	*/
+	for ( i = 0; i < 65536; i++ )
+	{
+		int r = i & 31;
+		int g = ( i >> 5 ) & 63;
+		int b = ( i >> 11 ) & 31;
+
+		r <<= 3;
+		g <<= 2;
+		b <<= 3;
+
+		inverse16to8table[i] = BestColor( r, g, b, 0, 255 );
+	}
+}
+
+void Alphalight_Thread (int i)
+{
+	int		j;
+	float	r, g, b;
+	float	mr, mg, mb, ma;
+	float	distortion, bestdistortion;
+	float	v;
+
+	r = (i>>10) * (1.0/16);
+	g = ((i>>5)&31)  * (1.0/16);
+	b = (i&31) * (1.0/16);
+
+	bestdistortion = 999999;
+	for (j=0 ; j<16*16*16*16 ; j++)
+	{
+		mr = (j>>12) * (1.0/16);
+		mg = ((j>>8)&15) * (1.0/16);
+		mb = ((j>>4)&15) * (1.0/16);
+		ma = (j&15) * (1.0/16);
+
+		v = r * 0.5 - (mr*ma + 0.5*(1.0-ma));
+		distortion = v*v;
+		v = g * 0.5 - (mg*ma + 0.5*(1.0-ma));
+		distortion += v*v;
+		v = b * 0.5 - (mb*ma + 0.5*(1.0-ma));
+		distortion += v*v;
+
+		distortion *= 1.0 + ma*4;
+
+		if (distortion < bestdistortion)
+		{
+			bestdistortion = distortion;
+			alphamap[i] = j;
+		}
+	}
+}
+
+void Cmd_Alphalight (void)
+{
+	char	savename[1024];
+
+	GetToken (false);
+
+	if (g_release)
+	{
+		ReleaseFile (token);
+		return;
+	}
+
+	sprintf (savename, "%s%s", gamedir, token);
+	printf ("Building alphalight table...\n");
+
+	RunThreadsOnIndividual (32*32*32, true, Alphalight_Thread);
+
+	SaveFile (savename, (byte *)alphamap, sizeof(alphamap));
+}
+
+
+void Cmd_Inverse16Table( void )
+{
+	char savename[1024];
+
+	if ( g_release )
+	{
+		sprintf (savename, "pics/16to8.dat");
+		ReleaseFile( savename );
+		return;
+	}
+
+	sprintf (savename, "%spics/16to8.dat", gamedir);
+	printf ("Building inverse 16-to-8 table...\n");
+
+	Inverse16_BuildTable();
+
+	SaveFile( savename, (byte *) inverse16to8table, sizeof( inverse16to8table ) );
+}