virtualx-engine/thirdparty/misc/open-simplex-noise-no-allocate.patch

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);