prog_noise.c File Reference

C implementation of Perlin Simplex Noise over 1, 2, 3 and 4 dims. More...

#include "main/imports.h"
#include "prog_noise.h"

Go to the source code of this file.

Defines
#define	FASTFLOOR(x)   ( ((x)>0) ? ((int)x) : (((int)x)-1) )
#define	F2   0.366025403f /* F2 = 0.5*(sqrt(3.0)-1.0) */
#define	G2   0.211324865f /* G2 = (3.0-Math.sqrt(3.0))/6.0 */
#define	F3   0.333333333f
#define	G3   0.166666667f
#define	F4   0.309016994f /* F4 = (Math.sqrt(5.0)-1.0)/4.0 */
#define	G4   0.138196601f /* G4 = (5.0-Math.sqrt(5.0))/20.0 */
Functions
static float	grad1 (int hash, float x)
static float	grad2 (int hash, float x, float y)
static float	grad3 (int hash, float x, float y, float z)
static float	grad4 (int hash, float x, float y, float z, float t)
GLfloat	_mesa_noise1 (GLfloat x)
GLfloat	_mesa_noise2 (GLfloat x, GLfloat y)
GLfloat	_mesa_noise3 (GLfloat x, GLfloat y, GLfloat z)
GLfloat	_mesa_noise4 (GLfloat x, GLfloat y, GLfloat z, GLfloat w)
Variables
unsigned char	perm [512]
static unsigned char	simplex [64][4]

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Detailed Description

C implementation of Perlin Simplex Noise over 1, 2, 3 and 4 dims.

Author:

Stefan Gustavson (stegu@itn.liu.se)

This implementation is "Simplex Noise" as presented by Ken Perlin at a relatively obscure and not often cited course session "Real-Time Shading" at Siggraph 2001 (before real time shading actually took on), under the title "hardware noise". The 3D function is numerically equivalent to his Java reference code available in the PDF course notes, although I re-implemented it from scratch to get more readable code. The 1D, 2D and 4D cases were implemented from scratch by me from Ken Perlin's text.

This file has no dependencies on any other file, not even its own header file. The header file is made for use by external code only.

Definition in file prog_noise.c.