#include <quadsquare.h>

Public Member Functions
float	Sample (int x, int z, float &texture) const

Public Attributes
short *	Data

unsigned char *	terrainmap

int	XOrigin

int	ZOrigin

unsigned long	XSize

unsigned long	ZSize

unsigned int	RowWidth

int	Scale

Detailed Description

Definition at line 55 of file quadsquare.h.

Member Function Documentation

float HeightMapInfo::Sample	(	int	x,
		int	z,
		float &	texture
	)		const

Definition at line 445 of file quadsquare.cpp.

References float, x, and z.

Referenced by quadsquare::AddHeightMapAux().

 {
     //Break coordinates into grid-relative coords (ix,iz) and remainder (rx,rz)
     int ix   = (x-XOrigin)>>Scale;
     int iz   = (z-ZOrigin)>>Scale;
     int mask = (1<<Scale)-1;
     int rx   = (x-XOrigin)&mask;
     int rz   = (z-ZOrigin)&mask;
     int ixpp = ix+1;
     int izpp = iz+1;
     if (ix < 0) {
         ix   = 0;
         ixpp = 0;
     }
     if ( ix >= (int) (XSize-1) ) {
         ix   = XSize-1;
         ixpp = XSize-1;
     }
     if (iz < 0) {
         iz   = 0;
         izpp = 0;
     }
     if ( iz >= (int) (ZSize-1) ) {
         iz   = ZSize-1;
         izpp = ZSize-1;
     }
     float fx  = float(rx)/(mask+1);
     float fz  = float(rz)/(mask+1);
     float s00 = Data[ix+iz*RowWidth];
     float s01 = Data[(ixpp)+iz*RowWidth];
     float s10 = Data[ix+(izpp)*RowWidth];
     float s11 = Data[(ixpp)+(izpp)*RowWidth];
     float t00 = texturelookup[terrainmap[ix+iz*RowWidth]];
     float t01 = texturelookup[terrainmap[(ixpp)+iz*RowWidth]];
     float t10 = texturelookup[terrainmap[ix+(izpp)*RowWidth]];
     float t11 = texturelookup[terrainmap[(ixpp)+(izpp)*RowWidth]];
     texture = (t00*(1-fx)+t01*fx)*(1-fz)
               +(t10*(1-fx)+t11*fx)*fz;
     return (s00*(1-fx)+s01*fx)*(1-fz)
            +(s10*(1-fx)+s11*fx)*fz;
 }