nel/src/3d/tile_lumel.cpp

   1 // NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
   2 // Copyright (C) 2010  Winch Gate Property Limited
   3 //
   4 // This program is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU Affero General Public License as
   6 // published by the Free Software Foundation, either version 3 of the
   7 // License, or (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU Affero General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU Affero General Public License
  15 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "std3d.h"
  18
  19 #include "nel/3d/tile_lumel.h"
  20
  21 using namespace NLMISC;
  22
  23 #ifdef DEBUG_NEW
  24 #define new DEBUG_NEW
  25 #endif
  26
  27 namespace NL3D
  28 {
  29
  30
  31 // ***************************************************************************
  32 void CTileLumel::createUncompressed (uint8 interpolated, uint8 shaded)
  33 {
  34         // Shading
  35         Shaded=shaded;
  36
  37         // Same color ?
  38         if (interpolated!=shaded)
  39         {
  40                 // Compute compressed value
  41                 sint temp=((shaded<<3)/(sint)(interpolated?interpolated:1));
  42                 clamp (temp, 0, 15);
  43
  44                 // After decompression
  45                 uint decompressed=(((uint)interpolated*((uint)temp))>>3)+4;
  46                 if (decompressed>255)
  47                         decompressed=255;
  48
  49                 // Need to compress ?
  50                 if (abs((sint)shaded-(sint)decompressed)>=abs((sint)shaded-(sint)interpolated))
  51                 {
  52                         // Shadow not present
  53                         _ShadowValue=0xff;
  54                 }
  55                 else
  56                 {
  57                         // Shadow
  58                         _ShadowValue=temp;
  59                 }
  60         }
  61         else
  62         {
  63                 // Shadow not present
  64                 _ShadowValue=0xff;
  65         }
  66 }
  67
  68 // ***************************************************************************
  69 void CTileLumel::pack (CStreamBit& stream) const
  70 {
  71         // There is shadow here ?
  72         if (isShadowed ())
  73         {
  74                 // Put a true
  75                 stream.pushBackBool(true);
  76
  77                 // Read the shadow value
  78                 stream.pushBack4bits(_ShadowValue);
  79         }
  80         else
  81                 // Put a false
  82                 stream.pushBackBool(false);
  83 }
  84
  85
  86 } // NL3D
  87
  88
  89 /* End of tile_lumel.h */