godot/thirdparty/misc/open-simplex-noise-no-allocate.patch

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diff -u orig/open-simplex-noise.c misc/open-simplex-noise.c
--- orig/open-simplex-noise.c 2018-09-14 11:11:40.049810000 +0200
+++ misc/open-simplex-noise.c 2018-09-14 11:09:39.726457000 +0200
@@ -13,6 +13,11 @@
* of any particular randomization library, so results
* will be the same when ported to other languages.
*/
+
+// -- GODOT start --
+// Modified to work without allocating memory, also removed some unused function.
+// -- GODOT end --
+
#include <math.h>
#include <stdlib.h>
#include <stdint.h>
@@ -34,11 +39,12 @@
#define DEFAULT_SEED (0LL)
-struct osn_context {
+// -- GODOT start --
+/*struct osn_context {
int16_t *perm;
int16_t *permGradIndex3D;
-};
-
+};*/
+// -- GODOT end --
#define ARRAYSIZE(x) (sizeof((x)) / sizeof((x)[0]))
/*
@@ -126,7 +132,9 @@
int xi = (int) x;
return x < xi ? xi - 1 : xi;
}
-
+
+// -- GODOT start --
+/*
static int allocate_perm(struct osn_context *ctx, int nperm, int ngrad)
{
if (ctx->perm)
@@ -154,18 +162,21 @@
memcpy(ctx->perm, p, sizeof(*ctx->perm) * nelements);
for (i = 0; i < 256; i++) {
- /* Since 3D has 24 gradients, simple bitmask won't work, so precompute modulo array. */
+ // Since 3D has 24 gradients, simple bitmask won't work, so precompute modulo array.
ctx->permGradIndex3D[i] = (int16_t)((ctx->perm[i] % (ARRAYSIZE(gradients3D) / 3)) * 3);
}
return 0;
}
+*/
+// -- GODOT end --
/*
* Initializes using a permutation array generated from a 64-bit seed.
* Generates a proper permutation (i.e. doesn't merely perform N successive pair
* swaps on a base array). Uses a simple 64-bit LCG.
*/
-int open_simplex_noise(int64_t seed, struct osn_context **ctx)
+// -- GODOT start --
+int open_simplex_noise(int64_t seed, struct osn_context *ctx)
{
int rc;
int16_t source[256];
@@ -174,20 +185,9 @@
int16_t *permGradIndex3D;
int r;
- *ctx = (struct osn_context *) malloc(sizeof(**ctx));
- if (!(*ctx))
- return -ENOMEM;
- (*ctx)->perm = NULL;
- (*ctx)->permGradIndex3D = NULL;
-
- rc = allocate_perm(*ctx, 256, 256);
- if (rc) {
- free(*ctx);
- return rc;
- }
-
- perm = (*ctx)->perm;
- permGradIndex3D = (*ctx)->permGradIndex3D;
+ perm = ctx->perm;
+ permGradIndex3D = ctx->permGradIndex3D;
+// -- GODOT end --
for (i = 0; i < 256; i++)
source[i] = (int16_t) i;
@@ -206,6 +206,8 @@
return 0;
}
+// -- GODOT start --
+/*
void open_simplex_noise_free(struct osn_context *ctx)
{
if (!ctx)
@@ -220,6 +222,8 @@
}
free(ctx);
}
+*/
+// -- GODOT end --
/* 2D OpenSimplex (Simplectic) Noise. */
double open_simplex_noise2(struct osn_context *ctx, double x, double y)
diff -u orig/open-simplex-noise.h misc/open-simplex-noise.h
--- orig/open-simplex-noise.h 2018-09-14 11:11:19.659807000 +0200
+++ misc/open-simplex-noise.h 2018-09-14 11:10:05.006460000 +0200
@@ -35,11 +35,18 @@
extern "C" {
#endif
-struct osn_context;
+// -- GODOT start --
+// Modified to work without allocating memory, also removed some unused function.
-int open_simplex_noise(int64_t seed, struct osn_context **ctx);
+struct osn_context {
+ int16_t perm[256];
+ int16_t permGradIndex3D[256];
+};
+
+int open_simplex_noise(int64_t seed, struct osn_context *ctx);
+//int open_simplex_noise_init_perm(struct osn_context *ctx, int16_t p[], int nelements);
+// -- GODOT end --
void open_simplex_noise_free(struct osn_context *ctx);
-int open_simplex_noise_init_perm(struct osn_context *ctx, int16_t p[], int nelements);
double open_simplex_noise2(struct osn_context *ctx, double x, double y);
double open_simplex_noise3(struct osn_context *ctx, double x, double y, double z);
double open_simplex_noise4(struct osn_context *ctx, double x, double y, double z, double w);