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.
134 lines
3.6 KiB
Diff
134 lines
3.6 KiB
Diff
diff -u orig/open-simplex-noise.c misc/open-simplex-noise.c
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--- orig/open-simplex-noise.c 2018-09-14 11:11:40.049810000 +0200
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+++ misc/open-simplex-noise.c 2018-09-14 11:09:39.726457000 +0200
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@@ -13,6 +13,11 @@
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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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+
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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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+// -- GODOT end --
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+
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#include <math.h>
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#include <stdlib.h>
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#include <stdint.h>
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@@ -34,11 +39,12 @@
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#define DEFAULT_SEED (0LL)
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-struct osn_context {
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+// -- GODOT start --
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+/*struct osn_context {
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int16_t *perm;
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int16_t *permGradIndex3D;
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-};
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-
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+};*/
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+// -- GODOT end --
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#define ARRAYSIZE(x) (sizeof((x)) / sizeof((x)[0]))
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/*
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@@ -126,7 +132,9 @@
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int xi = (int) x;
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return x < xi ? xi - 1 : xi;
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}
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-
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+
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+// -- GODOT start --
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+/*
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static int allocate_perm(struct osn_context *ctx, int nperm, int ngrad)
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{
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if (ctx->perm)
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@@ -154,18 +162,21 @@
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memcpy(ctx->perm, p, sizeof(*ctx->perm) * nelements);
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for (i = 0; i < 256; i++) {
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- /* Since 3D has 24 gradients, simple bitmask won't work, so precompute modulo array. */
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+ // Since 3D has 24 gradients, simple bitmask won't work, so precompute modulo array.
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ctx->permGradIndex3D[i] = (int16_t)((ctx->perm[i] % (ARRAYSIZE(gradients3D) / 3)) * 3);
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}
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return 0;
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}
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+*/
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+// -- GODOT end --
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/*
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* Initializes using a permutation array generated from a 64-bit seed.
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* Generates a proper permutation (i.e. doesn't merely perform N successive pair
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* swaps on a base array). Uses a simple 64-bit LCG.
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*/
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-int open_simplex_noise(int64_t seed, struct osn_context **ctx)
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+// -- GODOT start --
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+int open_simplex_noise(int64_t seed, struct osn_context *ctx)
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{
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int rc;
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int16_t source[256];
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@@ -174,20 +185,9 @@
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int16_t *permGradIndex3D;
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int r;
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- *ctx = (struct osn_context *) malloc(sizeof(**ctx));
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- if (!(*ctx))
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- return -ENOMEM;
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- (*ctx)->perm = NULL;
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- (*ctx)->permGradIndex3D = NULL;
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-
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- rc = allocate_perm(*ctx, 256, 256);
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- if (rc) {
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- free(*ctx);
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- return rc;
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- }
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-
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- perm = (*ctx)->perm;
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- permGradIndex3D = (*ctx)->permGradIndex3D;
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+ perm = ctx->perm;
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+ permGradIndex3D = ctx->permGradIndex3D;
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+// -- GODOT end --
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for (i = 0; i < 256; i++)
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source[i] = (int16_t) i;
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@@ -206,6 +206,8 @@
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return 0;
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}
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+// -- GODOT start --
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+/*
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void open_simplex_noise_free(struct osn_context *ctx)
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{
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if (!ctx)
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@@ -220,6 +222,8 @@
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}
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free(ctx);
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}
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+*/
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+// -- GODOT end --
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/* 2D OpenSimplex (Simplectic) Noise. */
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double open_simplex_noise2(struct osn_context *ctx, double x, double y)
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diff -u orig/open-simplex-noise.h misc/open-simplex-noise.h
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--- orig/open-simplex-noise.h 2018-09-14 11:11:19.659807000 +0200
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+++ misc/open-simplex-noise.h 2018-09-14 11:10:05.006460000 +0200
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@@ -35,11 +35,18 @@
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extern "C" {
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#endif
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-struct osn_context;
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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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-int open_simplex_noise(int64_t seed, struct osn_context **ctx);
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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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+
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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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-int open_simplex_noise_init_perm(struct osn_context *ctx, int16_t p[], int nelements);
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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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