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noise.h
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1#pragma once
2#ifndef MATH_NOISE_H
3#define MATH_NOISE_H
4//------------------------------------------------------------------------------
16#include "core/types.h"
17
18//------------------------------------------------------------------------------
19namespace Math
20{
21class noise
22{
23public:
25 static float gen(float x, float y, float z);
26
27private:
29 static float fade(float t);
31 static float lerp(float t, float a, float b);
33 static float grad(int hash, float x, float y, float z);
34
35 static int perm[512];
36};
37
38int noise::perm[512] = {60,137,91,90,15,
39 131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
40 190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
41 88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
42 77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
43 102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
44 135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
45 5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
46 223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
47 129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
48 251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
49 49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
50 138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
51 };
52
53//------------------------------------------------------------------------------
56inline
57float
59{
60 return t * t * t * (t * (t * 6.0f - 15.0f) + 10.0f);
61}
62
63//------------------------------------------------------------------------------
66inline
67float
68noise::lerp(float t, float a, float b)
69{
70 return a + t * (b - a);
71}
72
73//------------------------------------------------------------------------------
76inline
77float
78noise::grad(int hash, float x, float y, float z)
79{
80 int h = hash & 15;
81 float u = h < 8 ? x : y;
82 float v = h < 4 ? y : ((h == 12) || (h==14)) ? x : z;
83 return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
84}
85
86//------------------------------------------------------------------------------
89inline
90float
91noise::gen(float x, float y, float z)
92{
93 float floorX = floorf(x);
94 float floorY = floorf(y);
95 float floorZ = floorf(z);
96
97 // find unit cube that contains point
98 int X = int(floorX) & 255;
99 int Y = int(floorY) & 255;
100 int Z = int(floorZ) & 255;
101
102 // find relative x,y,z of point in cube
103 x -= floorX;
104 y -= floorY;
105 z -= floorZ;
106
107 // compute fade curves for x, y, z
108 float u = fade(x);
109 float v = fade(y);
110 float w = fade(z);
111
112 // hash coords of 8 cube corners
113 int A = perm[X] + Y;
114 int AA = perm[A] + Z;
115 int AB = perm[A+1] + Z;
116 int B = perm[X+1] + Y;
117 int BA = perm[B] + Z;
118 int BB = perm[B+1] + Z;
119
120 // add blended results from 8 corners of cube
121 return lerp(w, lerp(v, lerp(u, grad(perm[AA ], x , y , z ),
122 grad(perm[BA ], x-1, y , z )),
123 lerp(u, grad(perm[AB ], x , y-1, z ),
124 grad(perm[BB ], x-1, y-1, z ))),
125 lerp(v, lerp(u, grad(perm[AA+1], x , y , z-1 ),
126 grad(perm[BA+1], x-1, y , z-1 )),
127 lerp(u, grad(perm[AB+1], x , y-1, z-1 ),
128 grad(perm[BB+1], x-1, y-1, z-1 ))));
129}
130
131} // namespace Math
132//------------------------------------------------------------------------------
133#endif
Perlin noise class.
Definition noise.h:22
static float grad(int hash, float x, float y, float z)
convert into gradient direction
Definition noise.h:78
static float lerp(float t, float a, float b)
lerp between a and b
Definition noise.h:68
static float fade(float t)
compute fade curve
Definition noise.h:58
static int perm[512]
Definition noise.h:35
static float gen(float x, float y, float z)
generate noise value
Definition noise.h:91
@ Y
Definition euler.h:8
@ Z
Definition euler.h:8
#define X(x)
Definition materialloader.cc:153
Different curves.
Definition angularpfeedbackloop.h:17