4 =============================================================================
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6 ALPHALIGHT GENERATION
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8 Find alphamap values that best match modulated lightmap values
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10 This isn't used anymore, but I'm keeping it around...
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11 =============================================================================
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14 unsigned short alphamap[32*32*32];
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15 unsigned char inverse16to8table[65536];
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18 static int FindNearestColor( unsigned int color )
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21 int closest_so_far = 0;
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22 float closest_distance_so_far = 100000000;
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24 float r[2], g[2], b[2];
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26 // incoming color is assumed to be in 0xRRGGBB format
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27 r[0] = ( color & 31 ) << 3;
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28 g[0] = ( ( color >> 5 ) & 63 ) << 2;
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29 b[0] = ( ( color >> 11 ) & 31 ) << 3;
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31 for ( i = 0; i < 256; i++ )
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33 r[1] = ( d_8to24table[i] >> 0 ) & 0xFF;
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34 g[1] = ( d_8to24table[i] >> 8 ) & 0xFF;
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35 b[1] = ( d_8to24table[i] >> 16 ) & 0xFF;
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37 d = ( r[1] - r[0] ) * ( r[1] - r[0] ) +
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38 ( g[1] - g[0] ) * ( g[1] - g[0] ) +
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39 ( b[1] - b[0] ) * ( b[1] - b[0] );
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41 if ( d < closest_distance_so_far )
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43 closest_distance_so_far = d;
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48 return closest_so_far;
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52 extern byte BestColor( int, int, int, int, int );
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54 void Inverse16_BuildTable( void )
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59 ** create the 16-to-8 table
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61 for ( i = 0; i < 65536; i++ )
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64 int g = ( i >> 5 ) & 63;
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65 int b = ( i >> 11 ) & 31;
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71 inverse16to8table[i] = BestColor( r, g, b, 0, 255 );
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75 void Alphalight_Thread (int i)
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79 float mr, mg, mb, ma;
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80 float distortion, bestdistortion;
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83 r = (i>>10) * (1.0/16);
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84 g = ((i>>5)&31) * (1.0/16);
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85 b = (i&31) * (1.0/16);
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87 bestdistortion = 999999;
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88 for (j=0 ; j<16*16*16*16 ; j++)
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90 mr = (j>>12) * (1.0/16);
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91 mg = ((j>>8)&15) * (1.0/16);
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92 mb = ((j>>4)&15) * (1.0/16);
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93 ma = (j&15) * (1.0/16);
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95 v = r * 0.5 - (mr*ma + 0.5*(1.0-ma));
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97 v = g * 0.5 - (mg*ma + 0.5*(1.0-ma));
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99 v = b * 0.5 - (mb*ma + 0.5*(1.0-ma));
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102 distortion *= 1.0 + ma*4;
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104 if (distortion < bestdistortion)
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106 bestdistortion = distortion;
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112 void Cmd_Alphalight (void)
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114 char savename[1024];
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120 ReleaseFile (token);
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124 sprintf (savename, "%s%s", gamedir, token);
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125 printf ("Building alphalight table...\n");
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127 RunThreadsOnIndividual (32*32*32, true, Alphalight_Thread);
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129 SaveFile (savename, (byte *)alphamap, sizeof(alphamap));
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133 void Cmd_Inverse16Table( void )
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135 char savename[1024];
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139 sprintf (savename, "pics/16to8.dat");
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140 ReleaseFile( savename );
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144 sprintf (savename, "%spics/16to8.dat", gamedir);
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145 printf ("Building inverse 16-to-8 table...\n");
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147 Inverse16_BuildTable();
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149 SaveFile( savename, (byte *) inverse16to8table, sizeof( inverse16to8table ) );
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