khanat-opennel-code/code/nel/src/3d/height_map.cpp
2010-05-06 02:08:41 +02:00

75 lines
1.9 KiB
C++

// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "std3d.h"
#include "nel/3d/height_map.h"
using namespace NLMISC;
namespace NL3D
{
// ***************************************************************************
void CHeightMap::resize(uint w, uint h)
{
_Width= w;
_Height= h;
Heights.resize(w*h);
}
// ***************************************************************************
void CHeightMap::buildFromBitmap(const NLMISC::CBitmap &bitmap0)
{
// copy bitmap.
CBitmap bitmap= bitmap0;
// convert to luminance.
bitmap.convertToType(CBitmap::Luminance);
// resize array.
uint w, h;
w= bitmap.getWidth();
h= bitmap.getHeight();
resize(w,h);
// get luminance image.
CObjectVector<uint8> &array= bitmap.getPixels();
// invert the image in Y.
for(uint y=0;y<h;y++)
{
for(uint x=0;x<w;x++)
{
uint8 v= array[(h-1-y)*w+x];
Heights[y*w+x]= v;
}
}
}
// ***************************************************************************
float CHeightMap::getZ(uint x, uint y) const
{
nlassert(x<_Width && y<_Height);
return Heights[y*_Width+x]*MaxZ/255;
}
} // NL3D