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/**
\file BumpMapPreprocess.h
\maintainer Morgan McGuire, http://graphics.cs.williams.edu
\created 2010-01-28
\edited 2010-01-28
Copyright 2000-2012, Morgan McGuire.
All rights reserved.
*/
#ifndef G3D_BumpMapPreprocess_h
#define G3D_BumpMapPreprocess_h
#include "G3D/platform.h"
namespace G3D {
class Any;
/**
Not in the BumpMap class to avoid a circular dependency between Texture and BumpMap.
G3D::Image::computeNormalMap().
*/
class BumpMapPreprocess {
public:
/** If true, the elevations are box filtered after computing normals
and before uploading, which produces better results for parallax offset mapping
Defaults to false. */
bool lowPassFilter;
/** Height of the maximum ("white") value, in pixels, for the purpose of computing normals.
A value of 255 means that a 255 x 255 bump image with a full black-to-white gradient
will produce a 45-degree ramp (this also results in "cubic" voxels).
A negative value means to set zExtentPixels to -zExtentPixels * max(width, height).
The default is -0.02.
*/
float zExtentPixels;
/** After computing normals, scale the height by |N.z|, a trick that reduces texture swim in steep areas for parallax offset
mapping. Defaults to false.*/
bool scaleZByNz;
BumpMapPreprocess() : lowPassFilter(false), zExtentPixels(-0.02f), scaleZByNz(false) {}
BumpMapPreprocess(const Any& any);
Any toAny() const;
bool operator==(const BumpMapPreprocess& other) const {
return
(lowPassFilter == other.lowPassFilter) &&
(zExtentPixels == other.zExtentPixels) &&
(scaleZByNz == other.scaleZByNz);
}
};
}
#endif
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