godot/modules/opensimplex/simplex_noise.h

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/*  simplex_noise.h                                                      */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
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#ifndef SIMPLEX_NOISE_H
#define SIMPLEX_NOISE_H

#include "core/image.h"
#include "core/reference.h"
#include "scene/resources/texture.h"

#include "thirdparty/misc/open-simplex-noise.h"

class SimplexNoise : public Resource {
	GDCLASS(SimplexNoise, Resource)
	OBJ_SAVE_TYPE(SimplexNoise);

	osn_context contexts[6];

	int seed;
	float persistance; // Controls details, value in [0,1]. Higher increases grain, lower increases smoothness.
	int octaves; // Number of noise layers
	float period; // Distance above which we start to see similarities. The higher, the longer "hills" will be on a terrain.
	float lacunarity; // Controls period change across octaves. 2 is usually a good value to address all detail levels.

public:
	SimplexNoise();
	~SimplexNoise();

	void _init_seeds();

	void set_seed(int seed);
	int get_seed();

	void set_octaves(int p_octaves);
	int get_octaves() const { return octaves; }

	void set_period(float p_period);
	float get_period() const { return period; }

	void set_persistance(float p_persistance);
	float get_persistance() const { return persistance; }

	void set_lacunarity(float p_lacunarity);
	float get_lacunarity() const { return lacunarity; }

	Ref<Image> get_image(int p_width, int p_height);
	Ref<Image> get_seamless_image(int p_size);

	float get_noise_2d(float x, float y);
	float get_noise_3d(float x, float y, float z);
	float get_noise_4d(float x, float y, float z, float w);

	_FORCE_INLINE_ float _get_octave_noise_2d(int octave, float x, float y) { return open_simplex_noise2(&(contexts[octave]), x, y); }
	_FORCE_INLINE_ float _get_octave_noise_3d(int octave, float x, float y, float z) { return open_simplex_noise3(&(contexts[octave]), x, y, z); }
	_FORCE_INLINE_ float _get_octave_noise_4d(int octave, float x, float y, float z, float w) { return open_simplex_noise4(&(contexts[octave]), x, y, z, w); }

	// Convenience

	_FORCE_INLINE_ float get_noise_2dv(Vector2 v) { return get_noise_2d(v.x, v.y); }
	_FORCE_INLINE_ float get_noise_3dv(Vector3 v) { return get_noise_3d(v.x, v.y, v.z); }

protected:
	static void _bind_methods();
};

#endif // OPENSIMPLEX_NOISE_H