Procedural Texture Extension

#include <math.h>
#include "extensionmanager.h"
#include "textureextension.h"
class CproceduralChecker : public CtextureExtension
{
 DECLARE_EXTENSION_METHODS( "Checker", CproceduralChecker, 1 )
 unsigned int uRepeat, vRepeat;
public:
 CproceduralChecker()
 {
 getExtensionData()->createUInt( "repeatU", 10, 1, 10000 );
 getExtensionData()->createUInt( "repeatV", 10, 1, 10000 );
 }
 ~CproceduralChecker()
 {
 }
 bool initialize()
 {
 getExtensionData()->getUInt( "repeatU", uRepeat );
 getExtensionData()->getUInt( "repeatV", vRepeat );
 return true;
 }
 bool getRGB( Crgb& rgb, real u, real v, const IntersectionInfo* intersectionInfo )
 {
 int pu = ( ( int )( uRepeat * fabs( u ) ) ) % 2;
 int pv = ( ( int )( vRepeat * fabs( v ) ) ) % 2;
 rgb.r *= pu ^ pv;
 rgb.g *= pu ^ pv;
 rgb.b *= pu ^ pv;
 return true;
 }
};
EXPORT_TEXTURE_EXTENSION( CproceduralChecker )