nel/src/3d/height_map.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/height_map.h"
  20
  21
  22 using namespace NLMISC;
  23
  24 #ifdef DEBUG_NEW
  25 #define new DEBUG_NEW
  26 #endif
  27
  28 namespace NL3D
  29 {
  30
  31
  32 // ***************************************************************************
  33 void                    CHeightMap::resize(uint w, uint h)
  34 {
  35         _Width= w;
  36         _Height= h;
  37         Heights.resize(w*h);
  38 }
  39
  40
  41 // ***************************************************************************
  42 void                    CHeightMap::buildFromBitmap(const NLMISC::CBitmap &bitmap0)
  43 {
  44         // copy bitmap.
  45         CBitmap         bitmap= bitmap0;
  46         // convert to luminance.
  47         bitmap.convertToType(CBitmap::Luminance);
  48
  49         // resize array.
  50         uint    w, h;
  51         w= bitmap.getWidth();
  52         h= bitmap.getHeight();
  53         resize(w,h);
  54
  55         // get luminance image.
  56         CObjectVector<uint8>    &array= bitmap.getPixels();
  57         // invert the image in Y.
  58         for(uint y=0;y<h;y++)
  59         {
  60                 for(uint x=0;x<w;x++)
  61                 {
  62                         uint8   v= array[(h-1-y)*w+x];
  63                         Heights[y*w+x]= v;
  64                 }
  65         }
  66 }
  67
  68
  69 // ***************************************************************************
  70 float                   CHeightMap::getZ(uint x, uint y) const
  71 {
  72         nlassert(x<_Width && y<_Height);
  73         return Heights[y*_Width+x]*MaxZ/255;
  74 }
  75
  76
  77
  78 } // NL3D