--- /dev/null
+/*
+===========================================================================
+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 ) );
+}