X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Fnoise.h;h=05c877b3237c6b0f66a90d0a0465792250094737;hb=63867b1a372a4d1a4a4ffdec9d0862b094211a89;hp=63974e86ab38d832937ec7f0941205e0b8b76351;hpb=48a772b3c6388cbe7f9003557f27cc2cf51b8fe8;p=minetest.git diff --git a/src/noise.h b/src/noise.h index 63974e86a..05c877b32 100644 --- a/src/noise.h +++ b/src/noise.h @@ -1,39 +1,231 @@ /* -Minetest-c55 -Copyright (C) 2010-2011 celeron55, Perttu Ahola + * Minetest + * Copyright (C) 2010-2014 celeron55, Perttu Ahola + * Copyright (C) 2010-2014 kwolekr, Ryan Kwolek + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, are + * permitted provided that the following conditions are met: + * 1. Redistributions of source code must retain the above copyright notice, this list of + * conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, this list + * of conditions and the following disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. +#ifndef NOISE_HEADER +#define NOISE_HEADER -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. +#include "debug.h" +#include "irr_v3d.h" +#include "util/string.h" -You should have received a copy of the GNU General Public License along -with this program; if not, write to the Free Software Foundation, Inc., -51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. -*/ +#define PSEUDORANDOM_MAX 32767 -#ifndef NOISE_HEADER -#define NOISE_HEADER +extern FlagDesc flagdesc_noiseparams[]; + +class PseudoRandom +{ +public: + PseudoRandom(): m_next(0) + { + } + PseudoRandom(int seed): m_next(seed) + { + } + void seed(int seed) + { + m_next = seed; + } + // Returns 0...PSEUDORANDOM_MAX + int next() + { + m_next = m_next * 1103515245 + 12345; + return((unsigned)(m_next/65536) % (PSEUDORANDOM_MAX + 1)); + } + int range(int min, int max) + { + if (max-min > (PSEUDORANDOM_MAX + 1) / 10) + { + //dstream<<"WARNING: PseudoRandom::range: max > 32767"< max) + { + assert(0); + return max; + } + return (next()%(max-min+1))+min; + } +private: + int m_next; +}; + +#define NOISE_FLAG_DEFAULTS 0x01 +#define NOISE_FLAG_EASED 0x02 +#define NOISE_FLAG_ABSVALUE 0x04 + +//// TODO(hmmmm): implement these! +#define NOISE_FLAG_POINTBUFFER 0x08 +#define NOISE_FLAG_SIMPLEX 0x10 + +struct NoiseParams { + float offset; + float scale; + v3f spread; + s32 seed; + u16 octaves; + float persist; + float lacunarity; + u32 flags; + + NoiseParams() { + offset = 0.0f; + scale = 1.0f; + spread = v3f(250, 250, 250); + seed = 12345; + octaves = 3; + persist = 0.6f; + lacunarity = 2.0f; + flags = NOISE_FLAG_DEFAULTS; + } + + NoiseParams(float offset_, float scale_, v3f spread_, s32 seed_, + u16 octaves_, float persist_, float lacunarity_, + u32 flags_=NOISE_FLAG_DEFAULTS) + { + offset = offset_; + scale = scale_; + spread = spread_; + seed = seed_; + octaves = octaves_; + persist = persist_; + lacunarity = lacunarity_; + flags = flags_; + } +}; + + +// Convenience macros for getting/setting NoiseParams in Settings as a string +// WARNING: Deprecated, use Settings::getNoiseParamsFromValue() instead +#define NOISEPARAMS_FMT_STR "f,f,v3,s32,u16,f" +//#define getNoiseParams(x, y) getStruct((x), NOISEPARAMS_FMT_STR, &(y), sizeof(y)) +//#define setNoiseParams(x, y) setStruct((x), NOISEPARAMS_FMT_STR, &(y)) + +class Noise { +public: + NoiseParams np; + int seed; + int sx; + int sy; + int sz; + float *noise_buf; + float *gradient_buf; + float *persist_buf; + float *result; + + Noise(NoiseParams *np, int seed, int sx, int sy, int sz=1); + ~Noise(); + + void setSize(int sx, int sy, int sz=1); + void setSpreadFactor(v3f spread); + void setOctaves(int octaves); + + void gradientMap2D( + float x, float y, + float step_x, float step_y, + int seed); + void gradientMap3D( + float x, float y, float z, + float step_x, float step_y, float step_z, + int seed); + + float *perlinMap2D(float x, float y, float *persistence_map=NULL); + float *perlinMap3D(float x, float y, float z, float *persistence_map=NULL); + + inline float *perlinMap2D_PO(float x, float xoff, float y, float yoff, + float *persistence_map=NULL) + { + return perlinMap2D( + x + xoff * np.spread.X, + y + yoff * np.spread.Y, + persistence_map); + } + + inline float *perlinMap3D_PO(float x, float xoff, float y, float yoff, + float z, float zoff, float *persistence_map=NULL) + { + return perlinMap3D( + x + xoff * np.spread.X, + y + yoff * np.spread.Y, + z + zoff * np.spread.Z, + persistence_map); + } + +private: + void allocBuffers(); + void resizeNoiseBuf(bool is3d); + void updateResults(float g, float *gmap, float *persistence_map, size_t bufsize); + +}; + +float NoisePerlin2D(NoiseParams *np, float x, float y, int seed); +float NoisePerlin3D(NoiseParams *np, float x, float y, float z, int seed); + +inline float NoisePerlin2D_PO(NoiseParams *np, float x, float xoff, + float y, float yoff, int seed) +{ + return NoisePerlin2D(np, + x + xoff * np->spread.X, + y + yoff * np->spread.Y, + seed); +} + +inline float NoisePerlin3D_PO(NoiseParams *np, float x, float xoff, + float y, float yoff, float z, float zoff, int seed) +{ + return NoisePerlin3D(np, + x + xoff * np->spread.X, + y + yoff * np->spread.Y, + z + zoff * np->spread.Z, + seed); +} -double easeCurve(double t); - // Return value: -1 ... 1 -double noise2d(int x, int y, int seed); -double noise3d(int x, int y, int z, int seed); +float noise2d(int x, int y, int seed); +float noise3d(int x, int y, int z, int seed); + +float noise2d_gradient(float x, float y, int seed, bool eased=true); +float noise3d_gradient(float x, float y, float z, int seed, bool eased=false); + +float noise2d_perlin(float x, float y, int seed, + int octaves, float persistence, bool eased=true); + +float noise2d_perlin_abs(float x, float y, int seed, + int octaves, float persistence, bool eased=true); + +float noise3d_perlin(float x, float y, float z, int seed, + int octaves, float persistence, bool eased=false); -double noise2d_gradient(double x, double y, int seed); -double noise3d_gradient(double x, double y, double z, int seed); +float noise3d_perlin_abs(float x, float y, float z, int seed, + int octaves, float persistence, bool eased=false); -double noise2d_perlin(double x, double y, int seed, - int octaves, double persistence); +inline float easeCurve(float t) +{ + return t * t * t * (t * (6.f * t - 15.f) + 10.f); +} -double noise3d_perlin(double x, double y, double z, int seed, - int octaves, double persistence); +float contour(float v); #endif