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/* $Id: FilterNormal.h 19485 2009-03-31 22:34:34Z gsrb3d $
-----------------------------------------------------------------------------
This source file is part of blendTex library
Copyright (c) 2007 The Zdeno Ash Miklas
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
#if !defined FILTERNORMAL_H
#define FILTERNORMAL_H
#include "Common.h"
#include "FilterBase.h"
// scale constants for normals
const float depthScaleKoef = 255.0;
const float normScaleKoef = float(depthScaleKoef / 2.0);
/// pixel filter for normal mapping
class FilterNormal : public FilterBase
{
public:
/// constructor
FilterNormal (void);
/// destructor
virtual ~FilterNormal (void) {}
/// get index of color used to calculate normals
unsigned short getColor (void) { return m_colIdx; }
/// set index of color used to calculate normals
void setColor (unsigned short colIdx);
/// get depth
float getDepth (void) { return m_depth; }
/// set depth
void setDepth (float depth);
protected:
/// depth of normal relief
float m_depth;
/// scale to calculate normals
float m_depthScale;
/// color index, 0=red, 1=green, 2=blue, 3=alpha
unsigned short m_colIdx;
/// filter pixel, source int buffer
template <class SRC> unsigned int tFilter (SRC * src, short x, short y,
short * size, unsigned int pixSize, unsigned int val = 0)
{
// get value of required color
int actPix = int(VT_C(val,m_colIdx));
int upPix = actPix;
int leftPix = actPix;
// get upper and left pixel from actual pixel
if (y > 0)
{
val = convertPrevious(src - pixSize * size[0], x, y - 1, size, pixSize);
upPix = VT_C(val,m_colIdx);
}
if (x > 0)
{
val = convertPrevious(src - pixSize, x - 1, y, size, pixSize);
leftPix = VT_C(val,m_colIdx);
}
// height differences (from blue color)
float dx = (actPix - leftPix) * m_depthScale;
float dy = (actPix - upPix) * m_depthScale;
// normalize vector
float dz = float(normScaleKoef / sqrt(dx * dx + dy * dy + 1.0));
dx = dx * dz + normScaleKoef;
dy = dy * dz + normScaleKoef;
dz += normScaleKoef;
// return normal vector converted to color
VT_RGBA(val, dx, dy, dz, 0xFF);
return val;
}
/// filter pixel, source byte buffer
virtual unsigned int filter (unsigned char * src, short x, short y,
short * size, unsigned int pixSize, unsigned int val = 0)
{ return tFilter(src, x, y, size, pixSize, val); }
/// filter pixel, source int buffer
virtual unsigned int filter (unsigned int * src, short x, short y,
short * size, unsigned int pixSize, unsigned int val = 0)
{ return tFilter(src, x, y, size, pixSize, val); }
};
#endif
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