Add SimplexNoise and NoiseTexture as new resources

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.

1 files changed, 58 insertions, 0 deletions

diff --git a/thirdparty/misc/open-simplex-noise.h b/thirdparty/misc/open-simplex-noise.h
new file mode 100644
index 0000000000..89e0df8218
--- /dev/null
+++ b/thirdparty/misc/open-simplex-noise.h
@@ -0,0 +1,58 @@
+#ifndef OPEN_SIMPLEX_NOISE_H__
+#define OPEN_SIMPLEX_NOISE_H__
+
+/*
+ * OpenSimplex (Simplectic) Noise in C.
+ * Ported to C from Kurt Spencer's java implementation by Stephen M. Cameron
+ *
+ * v1.1 (October 6, 2014) 
+ * - Ported to C
+ * 
+ * v1.1 (October 5, 2014)
+ * - Added 2D and 4D implementations.
+ * - Proper gradient sets for all dimensions, from a
+ *   dimensionally-generalizable scheme with an actual
+ *   rhyme and reason behind it.
+ * - Removed default permutation array in favor of
+ *   default seed.
+ * - Changed seed-based constructor to be independent
+ *   of any particular randomization library, so results
+ *   will be the same when ported to other languages.
+ */
+
+#if ((__GNUC_STDC_INLINE__) || (__STDC_VERSION__ >= 199901L))
+	#include <stdint.h>
+	#define INLINE inline
+#elif (defined (_MSC_VER) || defined (__GNUC_GNU_INLINE__))
+	#include <stdint.h>
+	#define INLINE __inline
+#else 
+	/* ANSI C doesn't have inline or stdint.h. */
+	#define INLINE
+#endif
+
+#ifdef __cplusplus
+	extern "C" {
+#endif
+
+// -- GODOT start --
+// Modified to work without allocating memory, also removed some unused function. 
+
+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);
+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);
+
+#ifdef __cplusplus
+	}
+#endif
+
+#endif