/*
-Minetest-c55
-Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
+ * Minetest
+ * Copyright (C) 2010-2014 celeron55, Perttu Ahola <celeron55@gmail.com>
+ * Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+ * 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.
+#pragma once
-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 "irr_v3d.h"
+#include "exceptions.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.
-*/
+extern FlagDesc flagdesc_noiseparams[];
-#ifndef NOISE_HEADER
-#define NOISE_HEADER
+// Note: this class is not polymorphic so that its high level of
+// optimizability may be preserved in the common use case
+class PseudoRandom {
+public:
+ const static u32 RANDOM_RANGE = 32767;
+
+ inline PseudoRandom(int seed=0):
+ m_next(seed)
+ {
+ }
+
+ inline void seed(int seed)
+ {
+ m_next = seed;
+ }
+
+ inline int next()
+ {
+ m_next = m_next * 1103515245 + 12345;
+ return (unsigned)(m_next / 65536) % (RANDOM_RANGE + 1);
+ }
+
+ inline int range(int min, int max)
+ {
+ if (max < min)
+ throw PrngException("Invalid range (max < min)");
+ /*
+ Here, we ensure the range is not too large relative to RANDOM_MAX,
+ as otherwise the effects of bias would become noticable. Unlike
+ PcgRandom, we cannot modify this RNG's range as it would change the
+ output of this RNG for reverse compatibility.
+ */
+ if ((u32)(max - min) > (RANDOM_RANGE + 1) / 10)
+ throw PrngException("Range too large");
+
+ return (next() % (max - min + 1)) + min;
+ }
+
+private:
+ int m_next;
+};
+
+class PcgRandom {
+public:
+ const static s32 RANDOM_MIN = -0x7fffffff - 1;
+ const static s32 RANDOM_MAX = 0x7fffffff;
+ const static u32 RANDOM_RANGE = 0xffffffff;
+
+ PcgRandom(u64 state=0x853c49e6748fea9bULL, u64 seq=0xda3e39cb94b95bdbULL);
+ void seed(u64 state, u64 seq=0xda3e39cb94b95bdbULL);
+ u32 next();
+ u32 range(u32 bound);
+ s32 range(s32 min, s32 max);
+ void bytes(void *out, size_t len);
+ s32 randNormalDist(s32 min, s32 max, int num_trials=6);
+
+private:
+ u64 m_state;
+ u64 m_inc;
+};
+
+#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 = 0.0f;
+ float scale = 1.0f;
+ v3f spread = v3f(250, 250, 250);
+ s32 seed = 12345;
+ u16 octaves = 3;
+ float persist = 0.6f;
+ float lacunarity = 2.0f;
+ u32 flags = NOISE_FLAG_DEFAULTS;
+
+ NoiseParams() = default;
+
+ NoiseParams(float offset_, float scale_, const 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_;
+ }
+};
+
+class Noise {
+public:
+ NoiseParams np;
+ s32 seed;
+ u32 sx;
+ u32 sy;
+ u32 sz;
+ float *noise_buf = nullptr;
+ float *gradient_buf = nullptr;
+ float *persist_buf = nullptr;
+ float *result = nullptr;
+
+ Noise(NoiseParams *np, s32 seed, u32 sx, u32 sy, u32 sz=1);
+ ~Noise();
+
+ void setSize(u32 sx, u32 sy, u32 sz=1);
+ void setSpreadFactor(v3f spread);
+ void setOctaves(int octaves);
+
+ void gradientMap2D(
+ float x, float y,
+ float step_x, float step_y,
+ s32 seed);
+ void gradientMap3D(
+ float x, float y, float z,
+ float step_x, float step_y, float step_z,
+ s32 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, const float *persistence_map,
+ size_t bufsize);
+
+};
+
+float NoisePerlin2D(NoiseParams *np, float x, float y, s32 seed);
+float NoisePerlin3D(NoiseParams *np, float x, float y, float z, s32 seed);
+
+inline float NoisePerlin2D_PO(NoiseParams *np, float x, float xoff,
+ float y, float yoff, s32 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, s32 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);
+float noise2d(int x, int y, s32 seed);
+float noise3d(int x, int y, int z, s32 seed);
+
+float noise2d_gradient(float x, float y, s32 seed, bool eased=true);
+float noise3d_gradient(float x, float y, float z, s32 seed, bool eased=false);
+
+float noise2d_perlin(float x, float y, s32 seed,
+ int octaves, float persistence, bool eased=true);
+
+float noise2d_perlin_abs(float x, float y, s32 seed,
+ int octaves, float persistence, bool eased=true);
-double noise2d_gradient(double x, double y, int seed);
+float noise3d_perlin(float x, float y, float z, s32 seed,
+ int octaves, float persistence, bool eased=false);
-double noise2d_perlin(double x, double y, int seed,
- int octaves, double persistence);
+float noise3d_perlin_abs(float x, float y, float z, s32 seed,
+ int octaves, float persistence, bool eased=false);
-#endif
+inline float easeCurve(float t)
+{
+ return t * t * t * (t * (6.f * t - 15.f) + 10.f);
+}
+float contour(float v);
projects / oweals / minetest.git / blobdiff