main.cpp File Reference

Main. More...

#include "defines.h"
#include <stdlib.h>
#include <stdio.h>
#include "TerrainGenerator.h"
#include "CPUtime.h"

Functions
void	SaveDEMFile (float **cell, const int n, const float scale, const float altitude, const char *basefilename)
	Save a cell of terrain elevations. More...
float	Generate2DNoise (float **cell, const int x, const int y, const int m0, const int m1, const int n)
	Generate a cell of amortized noise. More...
void	GenerateAndSave2DNoise (int nRow, int nCol, const int m0, const int m1, const float altitude, const int n)
	Generate and save a cell of amortized noise. More...
int	main (int argc, char *argv[])
	Main. More...

Variables
CTerrainGenerator *	g_pTerrainGenerator = NULL
	Pointer to the terrain generator.

Function Documentation

Generate2DNoise()

float Generate2DNoise	(	float **	cell,
		const int	x,
		const int	y,
		const int	m0,
		const int	m1,
		const int	n
	)

Generate a cell of 2D amortized noise using the infinite amortized noise generator.

Parameters

cell	Pointer to array in which to store the noise.
x	Tile column index.
y	Tile row index.
m0	Largest octave.
m1	Smallest octave.
n	Cell size.

GenerateAndSave2DNoise()

void GenerateAndSave2DNoise	(	int	nRow,
		int	nCol,
		const int	m0,
		const int	m1,
		const float	altitude,
		const int	n
	)

Generate a cell of amortized noise and save it as a DEM file. This function allocates memory for the cell, creates an infinite amortized noise generator, uses it to generate the noise, saves it as a DEM file, deallocates the generator and cell memory and returns.

Parameters

nRow	Tile row index.
nCol	Tile column index.
m0	Largest octave.
m1	Smallest octave.
altitude	Multiplier to convert noise to height.
n	Cell size.

main()

int main	(	int	argc,
		char *	argv[]
	)

Prompts the user for a random number seed, a tail multiplier and an altitude cap and then generates and saves a 4096x4096 cell of terrain elevations generated using 8 octaves of amortized noise with an exponentially distributed gradient magnitude.

Parameters

argc	Argument count
argv	Arguments.

Returns

0 for success, 1 for failure.

SaveDEMFile()

void SaveDEMFile	(	float **	cell,
		const int	n,
		const float	scale,
		const float	altitude,
		const char *	basefilename
	)

Save a cell of noise as a DEM file. The output file will have a ".asc" file expension, which is standard for DEM files.

Parameters

cell	Pointer to 2D array of elevations.
n	Width and height of array.
scale	Scale value to normalize amortized noise.
altitude	Multiplier to convert noise to height.
basefilename	Name of DEM file for output, without extension.