f12a1b8863
SimplexNoise can be used to generate parameterized fractal noise based on Open Simplex. NoiseTexture uses SimplexNoise to generate noise textures for using in shaders/visual effects.
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
#ifndef OPEN_SIMPLEX_NOISE_H__
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#define OPEN_SIMPLEX_NOISE_H__
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/*
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* OpenSimplex (Simplectic) Noise in C.
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* Ported to C from Kurt Spencer's java implementation by Stephen M. Cameron
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*
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* v1.1 (October 6, 2014)
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* - Ported to C
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*
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* v1.1 (October 5, 2014)
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* - Added 2D and 4D implementations.
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* - Proper gradient sets for all dimensions, from a
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* dimensionally-generalizable scheme with an actual
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* rhyme and reason behind it.
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* - Removed default permutation array in favor of
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* default seed.
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* - Changed seed-based constructor to be independent
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* of any particular randomization library, so results
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* will be the same when ported to other languages.
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*/
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#if ((__GNUC_STDC_INLINE__) || (__STDC_VERSION__ >= 199901L))
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#include <stdint.h>
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#define INLINE inline
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#elif (defined (_MSC_VER) || defined (__GNUC_GNU_INLINE__))
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#include <stdint.h>
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#define INLINE __inline
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#else
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/* ANSI C doesn't have inline or stdint.h. */
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#define INLINE
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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// -- GODOT start --
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// Modified to work without allocating memory, also removed some unused function.
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struct osn_context {
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int16_t perm[256];
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int16_t permGradIndex3D[256];
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};
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int open_simplex_noise(int64_t seed, struct osn_context *ctx);
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//int open_simplex_noise_init_perm(struct osn_context *ctx, int16_t p[], int nelements);
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// -- GODOT end --
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void open_simplex_noise_free(struct osn_context *ctx);
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double open_simplex_noise2(struct osn_context *ctx, double x, double y);
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double open_simplex_noise3(struct osn_context *ctx, double x, double y, double z);
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double open_simplex_noise4(struct osn_context *ctx, double x, double y, double z, double w);
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#ifdef __cplusplus
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}
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#endif
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#endif
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