From bc6d477cbb66527da7c4976856f28a3d67d3dff9 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Thu, 19 May 2011 20:06:54 +0300
Subject: Add (possibly non-compatible) work-in-progress noise.{h,cpp} so that
 they won't be accidentally lost. These are useful for upcoming mapgen
 updates.

---
 src/noise.h.new | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 src/noise.h.new

(limited to 'src/noise.h.new')

diff --git a/src/noise.h.new b/src/noise.h.new
new file mode 100644
index 000000000..59ca1bf94
--- /dev/null
+++ b/src/noise.h.new
@@ -0,0 +1,108 @@
+/*
+Minetest-c55
+Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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.
+
+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.
+
+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.
+*/
+
+#ifndef NOISE_HEADER
+#define NOISE_HEADER
+
+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);
+
+double noise2d_gradient(double x, double y, int seed);
+double noise3d_gradient(double x, double y, double z, int seed);
+
+double noise2d_perlin(double x, double y, int seed,
+		int octaves, double persistence);
+
+double noise2d_perlin_abs(double x, double y, int seed,
+		int octaves, double persistence);
+
+double noise3d_perlin(double x, double y, double z, int seed,
+		int octaves, double persistence);
+
+double noise3d_perlin_abs(double x, double y, double z, int seed,
+		int octaves, double persistence);
+
+enum NoiseType
+{
+	NOISE_PERLIN,
+	NOISE_PERLIN_ABS,
+	NOISE_PERLIN_CONTOUR,
+	NOISE_PERLIN_CONTOUR_FLIP_YZ
+};
+
+struct NoiseParams
+{
+	NoiseType type;
+	int seed;
+	int octaves;
+	double persistence;
+	double pos_scale;
+	double noise_scale; // Useful for contour noises
+	
+	NoiseParams(NoiseType type_=NOISE_PERLIN, int seed_=0,
+			int octaves_=3, double persistence_=0.5,
+			double pos_scale_=100.0, double noise_scale_=1.0):
+		type(type_),
+		seed(seed_),
+		octaves(octaves_),
+		persistence(persistence_),
+		pos_scale(pos_scale_),
+		noise_scale(noise_scale_)
+	{
+	}
+};
+
+double noise3d_param(const NoiseParams &param, double x, double y, double z);
+
+class NoiseBuffer
+{
+public:
+	NoiseBuffer();
+	~NoiseBuffer();
+	
+	void clear();
+	void create(const NoiseParams &param,
+			double first_x, double first_y, double first_z,
+			double last_x, double last_y, double last_z,
+			double samplelength_x, double samplelength_y, double samplelength_z);
+	void multiply(const NoiseParams &param);
+	// Deprecated
+	void create(int seed, int octaves, double persistence,
+			bool abs,
+			double first_x, double first_y, double first_z,
+			double last_x, double last_y, double last_z,
+			double samplelength_x, double samplelength_y, double samplelength_z);
+
+	void intSet(int x, int y, int z, double d);
+	void intMultiply(int x, int y, int z, double d);
+	double intGet(int x, int y, int z);
+	double get(double x, double y, double z);
+
+private:
+	double *m_data;
+	double m_start_x, m_start_y, m_start_z;
+	double m_samplelength_x, m_samplelength_y, m_samplelength_z;
+	int m_size_x, m_size_y, m_size_z;
+};
+
+#endif
+
-- 
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