9 files changed, 42 insertions, 2 deletions
diff --git a/core/class_db.cpp b/core/class_db.cpp
index 219bdbddd8..f7b446707d 100644
--- a/core/class_db.cpp
+++ b/core/class_db.cpp
@@ -249,6 +249,11 @@ void ClassDB::set_current_api(APIType p_api) {
 	current_api = p_api;
 }
 
+ClassDB::APIType ClassDB::get_current_api() {
+
+	return current_api;
+}
+
 HashMap<StringName, ClassDB::ClassInfo> ClassDB::classes;
 HashMap<StringName, StringName> ClassDB::resource_base_extensions;
 HashMap<StringName, StringName> ClassDB::compat_classes;
diff --git a/core/class_db.h b/core/class_db.h
index 321682d76b..f18a7113d7 100644
--- a/core/class_db.h
+++ b/core/class_db.h
@@ -371,6 +371,7 @@ public:
 	static void init();
 
 	static void set_current_api(APIType p_api);
+	static APIType get_current_api();
 	static void cleanup();
 };
 
diff --git a/core/math/audio_frame.h b/core/math/audio_frame.h
index f970c510e0..ebe0356c93 100644
--- a/core/math/audio_frame.h
+++ b/core/math/audio_frame.h
@@ -122,6 +122,12 @@ struct AudioFrame {
 		r = p_frame.r;
 	}
 
+	_ALWAYS_INLINE_ AudioFrame operator=(const AudioFrame &p_frame) {
+		l = p_frame.l;
+		r = p_frame.r;
+		return *this;
+	}
+
 	_ALWAYS_INLINE_ AudioFrame() {}
 };
 
diff --git a/core/math/quat.h b/core/math/quat.h
index 7d71ec03e8..8ed2fa7cc2 100644
--- a/core/math/quat.h
+++ b/core/math/quat.h
@@ -131,6 +131,14 @@ public:
 			w(q.w) {
 	}
 
+	Quat operator=(const Quat &q) {
+		x = q.x;
+		y = q.y;
+		z = q.z;
+		w = q.w;
+		return *this;
+	}
+
 	Quat(const Vector3 &v0, const Vector3 &v1) // shortest arc
 	{
 		Vector3 c = v0.cross(v1);
diff --git a/core/math/random_number_generator.cpp b/core/math/random_number_generator.cpp
index fccc0f72fe..6add00c1d8 100644
--- a/core/math/random_number_generator.cpp
+++ b/core/math/random_number_generator.cpp
@@ -40,6 +40,7 @@ void RandomNumberGenerator::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("randi"), &RandomNumberGenerator::randi);
 	ClassDB::bind_method(D_METHOD("randf"), &RandomNumberGenerator::randf);
+	ClassDB::bind_method(D_METHOD("randfn", "mean", "deviation"), &RandomNumberGenerator::randfn, DEFVAL(0.0), DEFVAL(1.0));
 	ClassDB::bind_method(D_METHOD("randf_range", "from", "to"), &RandomNumberGenerator::randf_range);
 	ClassDB::bind_method(D_METHOD("randi_range", "from", "to"), &RandomNumberGenerator::randi_range);
 	ClassDB::bind_method(D_METHOD("randomize"), &RandomNumberGenerator::randomize);
diff --git a/core/math/random_number_generator.h b/core/math/random_number_generator.h
index 66c77b8ccf..6b6bcdd2cd 100644
--- a/core/math/random_number_generator.h
+++ b/core/math/random_number_generator.h
@@ -55,6 +55,8 @@ public:
 
 	_FORCE_INLINE_ real_t randf_range(real_t from, real_t to) { return randbase.random(from, to); }
 
+	_FORCE_INLINE_ real_t randfn(real_t mean = 0.0, real_t deviation = 1.0) { return randbase.randfn(mean, deviation); }
+
 	_FORCE_INLINE_ int randi_range(int from, int to) {
 		unsigned int ret = randbase.rand();
 		return ret % (to - from + 1) + from;
diff --git a/core/math/random_pcg.h b/core/math/random_pcg.h
index cd721ef4d1..0d1b311c0d 100644
--- a/core/math/random_pcg.h
+++ b/core/math/random_pcg.h
@@ -31,6 +31,8 @@
 #ifndef RANDOM_PCG_H
 #define RANDOM_PCG_H
 
+#include <math.h>
+
 #include "core/math/math_defs.h"
 
 #include "thirdparty/misc/pcg.h"
@@ -61,6 +63,13 @@ public:
 	_FORCE_INLINE_ double randd() { return (double)rand() / (double)RANDOM_MAX; }
 	_FORCE_INLINE_ float randf() { return (float)rand() / (float)RANDOM_MAX; }
 
+	_FORCE_INLINE_ double randfn(double p_mean, double p_deviation) {
+		return p_mean + p_deviation * (cos(Math_TAU * randd()) * sqrt(-2.0 * log(randd()))); // Box-Muller transform
+	}
+	_FORCE_INLINE_ float randfn(float p_mean, float p_deviation) {
+		return p_mean + p_deviation * (cos(Math_TAU * randf()) * sqrt(-2.0 * log(randf()))); // Box-Muller transform
+	}
+
 	double random(double p_from, double p_to);
 	float random(float p_from, float p_to);
 	real_t random(int p_from, int p_to) { return (real_t)random((real_t)p_from, (real_t)p_to); }
diff --git a/core/ustring.h b/core/ustring.h
index cb3d87378a..9288c1526e 100644
--- a/core/ustring.h
+++ b/core/ustring.h
@@ -97,6 +97,10 @@ public:
 
 	_FORCE_INLINE_ CharString() {}
 	_FORCE_INLINE_ CharString(const CharString &p_str) { _cowdata._ref(p_str._cowdata); }
+	_FORCE_INLINE_ CharString operator=(const CharString &p_str) {
+		_cowdata._ref(p_str._cowdata);
+		return *this;
+	}
 
 	bool operator<(const CharString &p_right) const;
 	CharString &operator+=(char p_char);
@@ -339,6 +343,10 @@ public:
 
 	_FORCE_INLINE_ String() {}
 	_FORCE_INLINE_ String(const String &p_str) { _cowdata._ref(p_str._cowdata); }
+	String operator=(const String &p_str) {
+		_cowdata._ref(p_str._cowdata);
+		return *this;
+	}
 
 	String(const char *p_str);
 	String(const CharType *p_str, int p_clip_to_len = -1);
diff --git a/core/variant_call.cpp b/core/variant_call.cpp
index 3812592639..9ef7b7e7e6 100644
--- a/core/variant_call.cpp
+++ b/core/variant_call.cpp
@@ -1927,9 +1927,9 @@ void register_variant_methods() {
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "IDENTITY", identity_transform);
 	transform_x.set(-1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0);
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "FLIP_X", transform_x);
-	transform_x.set(1, 0, 0, 0, -1, 0, 0, 0, 1, 0, 0, 0);
+	transform_y.set(1, 0, 0, 0, -1, 0, 0, 0, 1, 0, 0, 0);
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "FLIP_Y", transform_y);
-	transform_x.set(1, 0, 0, 0, 1, 0, 0, 0, -1, 0, 0, 0);
+	transform_z.set(1, 0, 0, 0, 1, 0, 0, 0, -1, 0, 0, 0);
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "FLIP_Z", transform_z);
 
 	_VariantCall::add_variant_constant(Variant::PLANE, "PLANE_YZ", Plane(Vector3(1, 0, 0), 0));