3 * Copyright (C) 2010-2014 celeron55, Perttu Ahola <celeron55@gmail.com>
4 * Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
7 * Redistribution and use in source and binary forms, with or without modification, are
8 * permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright notice, this list of
10 * conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
17 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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31 #include "util/string.h"
33 extern FlagDesc flagdesc_noiseparams[];
35 // Note: this class is not polymorphic so that its high level of
36 // optimizability may be preserved in the common use case
39 const static u32 RANDOM_RANGE = 32767;
41 inline PseudoRandom(int seed=0):
46 inline void seed(int seed)
53 m_next = m_next * 1103515245 + 12345;
54 return (unsigned)(m_next / 65536) % (RANDOM_RANGE + 1);
57 inline int range(int min, int max)
61 Here, we ensure the range is not too large relative to RANDOM_MAX,
62 as otherwise the effects of bias would become noticable. Unlike
63 PcgRandom, we cannot modify this RNG's range as it would change the
64 output of this RNG for reverse compatibility.
66 assert((u32)(max - min) <= (RANDOM_RANGE + 1) / 10);
68 return (next() % (max - min + 1)) + min;
77 const static s32 RANDOM_MIN = -0x7fffffff - 1;
78 const static s32 RANDOM_MAX = 0x7fffffff;
79 const static u32 RANDOM_RANGE = 0xffffffff;
81 PcgRandom(u64 state=0x853c49e6748fea9bULL, u64 seq=0xda3e39cb94b95bdbULL);
82 void seed(u64 state, u64 seq=0xda3e39cb94b95bdbULL);
85 s32 range(s32 min, s32 max);
86 void bytes(void *out, size_t len);
87 s32 randNormalDist(s32 min, s32 max, int num_trials=6);
94 #define NOISE_FLAG_DEFAULTS 0x01
95 #define NOISE_FLAG_EASED 0x02
96 #define NOISE_FLAG_ABSVALUE 0x04
98 //// TODO(hmmmm): implement these!
99 #define NOISE_FLAG_POINTBUFFER 0x08
100 #define NOISE_FLAG_SIMPLEX 0x10
116 spread = v3f(250, 250, 250);
121 flags = NOISE_FLAG_DEFAULTS;
124 NoiseParams(float offset_, float scale_, v3f spread_, s32 seed_,
125 u16 octaves_, float persist_, float lacunarity_,
126 u32 flags_=NOISE_FLAG_DEFAULTS)
134 lacunarity = lacunarity_;
140 // Convenience macros for getting/setting NoiseParams in Settings as a string
141 // WARNING: Deprecated, use Settings::getNoiseParamsFromValue() instead
142 #define NOISEPARAMS_FMT_STR "f,f,v3,s32,u16,f"
143 //#define getNoiseParams(x, y) getStruct((x), NOISEPARAMS_FMT_STR, &(y), sizeof(y))
144 //#define setNoiseParams(x, y) setStruct((x), NOISEPARAMS_FMT_STR, &(y))
158 Noise(NoiseParams *np, int seed, int sx, int sy, int sz=1);
161 void setSize(int sx, int sy, int sz=1);
162 void setSpreadFactor(v3f spread);
163 void setOctaves(int octaves);
167 float step_x, float step_y,
170 float x, float y, float z,
171 float step_x, float step_y, float step_z,
174 float *perlinMap2D(float x, float y, float *persistence_map=NULL);
175 float *perlinMap3D(float x, float y, float z, float *persistence_map=NULL);
177 inline float *perlinMap2D_PO(float x, float xoff, float y, float yoff,
178 float *persistence_map=NULL)
181 x + xoff * np.spread.X,
182 y + yoff * np.spread.Y,
186 inline float *perlinMap3D_PO(float x, float xoff, float y, float yoff,
187 float z, float zoff, float *persistence_map=NULL)
190 x + xoff * np.spread.X,
191 y + yoff * np.spread.Y,
192 z + zoff * np.spread.Z,
198 void resizeNoiseBuf(bool is3d);
199 void updateResults(float g, float *gmap, float *persistence_map, size_t bufsize);
203 float NoisePerlin2D(NoiseParams *np, float x, float y, int seed);
204 float NoisePerlin3D(NoiseParams *np, float x, float y, float z, int seed);
206 inline float NoisePerlin2D_PO(NoiseParams *np, float x, float xoff,
207 float y, float yoff, int seed)
209 return NoisePerlin2D(np,
210 x + xoff * np->spread.X,
211 y + yoff * np->spread.Y,
215 inline float NoisePerlin3D_PO(NoiseParams *np, float x, float xoff,
216 float y, float yoff, float z, float zoff, int seed)
218 return NoisePerlin3D(np,
219 x + xoff * np->spread.X,
220 y + yoff * np->spread.Y,
221 z + zoff * np->spread.Z,
225 // Return value: -1 ... 1
226 float noise2d(int x, int y, int seed);
227 float noise3d(int x, int y, int z, int seed);
229 float noise2d_gradient(float x, float y, int seed, bool eased=true);
230 float noise3d_gradient(float x, float y, float z, int seed, bool eased=false);
232 float noise2d_perlin(float x, float y, int seed,
233 int octaves, float persistence, bool eased=true);
235 float noise2d_perlin_abs(float x, float y, int seed,
236 int octaves, float persistence, bool eased=true);
238 float noise3d_perlin(float x, float y, float z, int seed,
239 int octaves, float persistence, bool eased=false);
241 float noise3d_perlin_abs(float x, float y, float z, int seed,
242 int octaves, float persistence, bool eased=false);
244 inline float easeCurve(float t)
246 return t * t * t * (t * (6.f * t - 15.f) + 10.f);
249 float contour(float v);