The terrain generator class. More...

Inheritance diagram for CTerrainGenerator:

Public Member Functions
	CTerrainGenerator (const unsigned int n, const unsigned int s, float tail)
	Constructor. More...

Public Member Functions inherited from CInfiniteAmortizedNoise2D
	CInfiniteAmortizedNoise2D (const unsigned n, const unsigned int s)
	Constructor. More...

	~CInfiniteAmortizedNoise2D ()
	Destructor.

float	generate (int x, int y, const int m0, const int m1, const int n, float **cell)
	Generate a cell of 2D amortized noise. More...

Protected Member Functions
unsigned int	h (const unsigned int x, const unsigned int y, unsigned int seed)
	2D hash function. More...

void	initEdgeTables (const int x, const int y, const int n)
	Initialize the amortized noise tables. More...

Protected Member Functions inherited from CInfiniteAmortizedNoise2D
virtual unsigned int	h (const unsigned int x, const unsigned int y)
	2D hash function. More...

void	FillUp (float *t, const float s, const int n)
	Fill amortized noise table bottom up. More...

void	FillDn (float *t, const float s, const int n)
	Fill amortized noise table top down. More...

virtual void	initEdgeTables (const int x, const int y, const int n)
	Initialize the amortized noise tables. More...

void	initSplineTable (const int n)
	Initialize the spline table. More...

float	getNoise (const int i, const int j)
	Get one point of amortized noise. More...

void	getNoise (const int n, const int i0, const int j0, float **cell)
	Get 1 octave of amortized noise into cell. More...

void	addNoise (const int n, const int i0, const int j0, const float scale, float **cell)
	Add 1 octave of amortized noise into cell. More...

Protected Attributes
unsigned int	seed1
	Hash seed for gradient magnitude.

unsigned int	seed2
	Hash seed for tail of gradient magnitude distribution.

float	omega
	Tail height multiplier.

Protected Attributes inherited from CInfiniteAmortizedNoise2D
float *	uax
	X coordinate of u used to compute a.

float *	vax
	X coordinate of v used to compute a.

float *	ubx
	X coordinate of u used to compute b.

float *	vbx
	X coordinate of v used to compute b.

float *	uay
	Y coordinate of u used to compute a.

float *	vay
	Y coordinate of v used to compute a.

float *	uby
	Y coordinate of u used to compute b.

float *	vby
	Y coordinate of v used to compute b.

float *	spline
	Spline table.

unsigned int	seed
	Hash seed.

Detailed Description

The terrain class implements the 2D infinite amortized noise algorithm with an exponential gradient magnitude distribution.

Constructor & Destructor Documentation

CTerrainGenerator::CTerrainGenerator	(	const unsigned int	n,
		const unsigned int	s,
		float	tail
	)

The constructor initializes the new random number seeds and omega, and relies on the CInfiniteAmortizedNoise2D constructor to do the rest.

Parameters

unsigned int CTerrainGenerator::h	(	const unsigned int	x,
		const unsigned int	y,
		unsigned int	seed
	)

protected

Hash two unsigned ints into a single unsigned int using MurmurHash.

Parameters

x	X coordinate of value to be hashed.
y	Y coordinate of value to be hashed.
seed	Seed for the hash function.

void CTerrainGenerator::initEdgeTables	(	const int	x0,
		const int	y0,
		const int	n
	)

protectedvirtual

Initialize the edge tables with gradients with a uniformly distributed direction and an exponentially distributed magnitude.

Parameters

x0	x coordinate of top left corner of cell.
y0	y coordinate of top left corner of cell.
n	Granularity.

The documentation for this class was generated from the following files: