Implement native extension system

* Deprecates GDNative in favor of a simpler, lower level interface.
* New extension system allows registering core engine classes.
* Simple header interface in gdnative_interace.h

13 files changed, 243 insertions, 141 deletions

diff --git a/doc/classes/@GlobalScope.xml b/doc/classes/@GlobalScope.xml
index fa118bec54..d0e594a78b 100644
--- a/doc/classes/@GlobalScope.xml
+++ b/doc/classes/@GlobalScope.xml
@@ -1224,6 +1224,8 @@
 		<member name="Marshalls" type="Marshalls" setter="" getter="">
 			The [Marshalls] singleton.
 		</member>
+		<member name="NativeExtensionManager" type="NativeExtensionManager" setter="" getter="">
+		</member>
 		<member name="NavigationMeshGenerator" type="NavigationMeshGenerator" setter="" getter="">
 			The [NavigationMeshGenerator] singleton.
 		</member>
diff --git a/doc/classes/Color.xml b/doc/classes/Color.xml
index 29c21b3213..7b1415e40d 100644
--- a/doc/classes/Color.xml
+++ b/doc/classes/Color.xml
@@ -80,14 +80,16 @@
 			</argument>
 			<argument index="2" name="b" type="float">
 			</argument>
+			<argument index="3" name="a" type="float">
+			</argument>
 			<description>
-				Constructs a [Color] from RGB values, typically between 0 and 1. Alpha will be 1.
+				Constructs a [Color] from RGBA values, typically between 0 and 1.
 				[codeblocks]
 				[gdscript]
-				var color = Color(0.2, 1.0, 0.7) # Similar to `Color8(51, 255, 178, 255)`
+				var color = Color(0.2, 1.0, 0.7, 0.8) # Similar to `Color8(51, 255, 178, 204)`
 				[/gdscript]
 				[csharp]
-				var color = new Color(0.2f, 1.0f, 0.7f); // Similar to `Color.Color8(51, 255, 178, 255)`
+				var color = new Color(0.2f, 1.0f, 0.7f, 0.8f); // Similar to `Color.Color8(51, 255, 178, 255, 204)`
 				[/csharp]
 				[/codeblocks]
 			</description>
@@ -101,16 +103,14 @@
 			</argument>
 			<argument index="2" name="b" type="float">
 			</argument>
-			<argument index="3" name="a" type="float">
-			</argument>
 			<description>
-				Constructs a [Color] from RGBA values, typically between 0 and 1.
+				Constructs a [Color] from RGB values, typically between 0 and 1. Alpha will be 1.
 				[codeblocks]
 				[gdscript]
-				var color = Color(0.2, 1.0, 0.7, 0.8) # Similar to `Color8(51, 255, 178, 204)`
+				var color = Color(0.2, 1.0, 0.7) # Similar to `Color8(51, 255, 178, 255)`
 				[/gdscript]
 				[csharp]
-				var color = new Color(0.2f, 1.0f, 0.7f, 0.8f); // Similar to `Color.Color8(51, 255, 178, 255, 204)`
+				var color = new Color(0.2f, 1.0f, 0.7f); // Similar to `Color.Color8(51, 255, 178, 255)`
 				[/csharp]
 				[/codeblocks]
 			</description>
@@ -349,12 +349,6 @@
 		<method name="operator +" qualifiers="operator">
 			<return type="Color">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="Color">
-			</return>
 			<argument index="0" name="right" type="Color">
 			</argument>
 			<description>
@@ -363,12 +357,6 @@
 		<method name="operator -" qualifiers="operator">
 			<return type="Color">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
-			<return type="Color">
-			</return>
 			<argument index="0" name="right" type="Color">
 			</argument>
 			<description>
@@ -414,6 +402,18 @@
 			<description>
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="Color">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="Color">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="to_abgr32" qualifiers="const">
 			<return type="int">
 			</return>
diff --git a/doc/classes/Control.xml b/doc/classes/Control.xml
index d7e70fad32..2692108d94 100644
--- a/doc/classes/Control.xml
+++ b/doc/classes/Control.xml
@@ -150,10 +150,10 @@
 				* it happens outside parent's rectangle and the parent has either [member rect_clip_content] enabled.
 			</description>
 		</method>
-		<method name="_has_point" qualifiers="virtual">
+		<method name="_has_point" qualifiers="virtual const">
 			<return type="bool">
 			</return>
-			<argument index="0" name="point" type="Vector2">
+			<argument index="0" name="" type="Vector2">
 			</argument>
 			<description>
 				Virtual method to be implemented by the user. Returns whether the given [code]point[/code] is inside this control.
diff --git a/doc/classes/NativeExtension.xml b/doc/classes/NativeExtension.xml
new file mode 100644
index 0000000000..c48af7df7b
--- /dev/null
+++ b/doc/classes/NativeExtension.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="NativeExtension" inherits="RefCounted" version="4.0">
+	<brief_description>
+	</brief_description>
+	<description>
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="close_library">
+			<return type="void">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="get_minimum_library_initialization_level" qualifiers="const">
+			<return type="int" enum="NativeExtension.InitializationLevel">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="initialize_library">
+			<return type="void">
+			</return>
+			<argument index="0" name="level" type="int" enum="NativeExtension.InitializationLevel">
+			</argument>
+			<description>
+			</description>
+		</method>
+		<method name="is_library_open" qualifiers="const">
+			<return type="bool">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="open_library">
+			<return type="int" enum="Error">
+			</return>
+			<argument index="0" name="path" type="String">
+			</argument>
+			<argument index="1" name="entry_symbol" type="String">
+			</argument>
+			<description>
+			</description>
+		</method>
+	</methods>
+	<constants>
+		<constant name="INITIALIZATION_LEVEL_CORE" value="0" enum="InitializationLevel">
+		</constant>
+		<constant name="INITIALIZATION_LEVEL_SERVERS" value="1" enum="InitializationLevel">
+		</constant>
+		<constant name="INITIALIZATION_LEVEL_SCENE" value="2" enum="InitializationLevel">
+		</constant>
+		<constant name="INITIALIZATION_LEVEL_EDITOR" value="3" enum="InitializationLevel">
+		</constant>
+	</constants>
+</class>
diff --git a/doc/classes/NativeExtensionManager.xml b/doc/classes/NativeExtensionManager.xml
new file mode 100644
index 0000000000..ba9018ff4c
--- /dev/null
+++ b/doc/classes/NativeExtensionManager.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="NativeExtensionManager" inherits="Object" version="4.0">
+	<brief_description>
+	</brief_description>
+	<description>
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="get_extension">
+			<return type="NativeExtension">
+			</return>
+			<argument index="0" name="path" type="String">
+			</argument>
+			<description>
+			</description>
+		</method>
+		<method name="get_loaded_extensions" qualifiers="const">
+			<return type="PackedStringArray">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="load_extension">
+			<return type="int" enum="NativeExtensionManager.LoadStatus">
+			</return>
+			<argument index="0" name="path" type="String">
+			</argument>
+			<description>
+			</description>
+		</method>
+		<method name="reload_extension">
+			<return type="int" enum="NativeExtensionManager.LoadStatus">
+			</return>
+			<argument index="0" name="path" type="String">
+			</argument>
+			<description>
+			</description>
+		</method>
+		<method name="unload_extension">
+			<return type="int" enum="NativeExtensionManager.LoadStatus">
+			</return>
+			<argument index="0" name="path" type="String">
+			</argument>
+			<description>
+			</description>
+		</method>
+	</methods>
+	<constants>
+		<constant name="LOAD_STATUS_OK" value="0" enum="LoadStatus">
+		</constant>
+		<constant name="LOAD_STATUS_FAILED" value="1" enum="LoadStatus">
+		</constant>
+		<constant name="LOAD_STATUS_ALREADY_LOADED" value="2" enum="LoadStatus">
+		</constant>
+		<constant name="LOAD_STATUS_NOT_LOADED" value="3" enum="LoadStatus">
+		</constant>
+		<constant name="LOAD_STATUS_NEEDS_RESTART" value="4" enum="LoadStatus">
+		</constant>
+	</constants>
+</class>
diff --git a/doc/classes/Plane.xml b/doc/classes/Plane.xml
index cca5793fc7..12869061c4 100644
--- a/doc/classes/Plane.xml
+++ b/doc/classes/Plane.xml
@@ -169,23 +169,23 @@
 			<description>
 			</description>
 		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="Plane">
+		<method name="operator ==" qualifiers="operator">
+			<return type="bool">
 			</return>
+			<argument index="0" name="right" type="Plane">
+			</argument>
 			<description>
 			</description>
 		</method>
-		<method name="operator -" qualifiers="operator">
+		<method name="operator unary+" qualifiers="operator">
 			<return type="Plane">
 			</return>
 			<description>
 			</description>
 		</method>
-		<method name="operator ==" qualifiers="operator">
-			<return type="bool">
+		<method name="operator unary-" qualifiers="operator">
+			<return type="Plane">
 			</return>
-			<argument index="0" name="right" type="Plane">
-			</argument>
 			<description>
 			</description>
 		</method>
diff --git a/doc/classes/Quaternion.xml b/doc/classes/Quaternion.xml
index 660204ee7d..06434ab268 100644
--- a/doc/classes/Quaternion.xml
+++ b/doc/classes/Quaternion.xml
@@ -177,17 +177,17 @@
 			</description>
 		</method>
 		<method name="operator *" qualifiers="operator">
-			<return type="Quaternion">
+			<return type="Vector3">
 			</return>
-			<argument index="0" name="right" type="Quaternion">
+			<argument index="0" name="right" type="Vector3">
 			</argument>
 			<description>
 			</description>
 		</method>
 		<method name="operator *" qualifiers="operator">
-			<return type="Vector3">
+			<return type="Quaternion">
 			</return>
-			<argument index="0" name="right" type="Vector3">
+			<argument index="0" name="right" type="Quaternion">
 			</argument>
 			<description>
 			</description>
@@ -211,12 +211,6 @@
 		<method name="operator +" qualifiers="operator">
 			<return type="Quaternion">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="Quaternion">
-			</return>
 			<argument index="0" name="right" type="Quaternion">
 			</argument>
 			<description>
@@ -225,12 +219,6 @@
 		<method name="operator -" qualifiers="operator">
 			<return type="Quaternion">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
-			<return type="Quaternion">
-			</return>
 			<argument index="0" name="right" type="Quaternion">
 			</argument>
 			<description>
@@ -268,6 +256,18 @@
 			<description>
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="Quaternion">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="Quaternion">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="slerp" qualifiers="const">
 			<return type="Quaternion">
 			</return>
diff --git a/doc/classes/Vector2.xml b/doc/classes/Vector2.xml
index 07d09c31dc..498aefbef0 100644
--- a/doc/classes/Vector2.xml
+++ b/doc/classes/Vector2.xml
@@ -304,12 +304,6 @@
 		<method name="operator +" qualifiers="operator">
 			<return type="Vector2">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="Vector2">
-			</return>
 			<argument index="0" name="right" type="Vector2">
 			</argument>
 			<description>
@@ -318,12 +312,6 @@
 		<method name="operator -" qualifiers="operator">
 			<return type="Vector2">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
-			<return type="Vector2">
-			</return>
 			<argument index="0" name="right" type="Vector2">
 			</argument>
 			<description>
@@ -401,6 +389,18 @@
 			<description>
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="Vector2">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="Vector2">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="orthogonal" qualifiers="const">
 			<return type="Vector2">
 			</return>
diff --git a/doc/classes/Vector2i.xml b/doc/classes/Vector2i.xml
index 930ec944ba..5f190de8ca 100644
--- a/doc/classes/Vector2i.xml
+++ b/doc/classes/Vector2i.xml
@@ -126,12 +126,6 @@
 		<method name="operator +" qualifiers="operator">
 			<return type="Vector2i">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="Vector2i">
-			</return>
 			<argument index="0" name="right" type="Vector2i">
 			</argument>
 			<description>
@@ -140,12 +134,6 @@
 		<method name="operator -" qualifiers="operator">
 			<return type="Vector2i">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
-			<return type="Vector2i">
-			</return>
 			<argument index="0" name="right" type="Vector2i">
 			</argument>
 			<description>
@@ -223,6 +211,18 @@
 			<description>
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="Vector2i">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="Vector2i">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="sign" qualifiers="const">
 			<return type="Vector2i">
 			</return>
diff --git a/doc/classes/Vector3.xml b/doc/classes/Vector3.xml
index eb1fd5f098..1361666c18 100644
--- a/doc/classes/Vector3.xml
+++ b/doc/classes/Vector3.xml
@@ -318,12 +318,6 @@
 		<method name="operator +" qualifiers="operator">
 			<return type="Vector3">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="Vector3">
-			</return>
 			<argument index="0" name="right" type="Vector3">
 			</argument>
 			<description>
@@ -332,12 +326,6 @@
 		<method name="operator -" qualifiers="operator">
 			<return type="Vector3">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
-			<return type="Vector3">
-			</return>
 			<argument index="0" name="right" type="Vector3">
 			</argument>
 			<description>
@@ -415,6 +403,18 @@
 			<description>
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="Vector3">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="Vector3">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="outer" qualifiers="const">
 			<return type="Basis">
 			</return>
diff --git a/doc/classes/Vector3i.xml b/doc/classes/Vector3i.xml
index 8b45a62afa..e08bafa665 100644
--- a/doc/classes/Vector3i.xml
+++ b/doc/classes/Vector3i.xml
@@ -134,12 +134,6 @@
 		<method name="operator +" qualifiers="operator">
 			<return type="Vector3i">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="Vector3i">
-			</return>
 			<argument index="0" name="right" type="Vector3i">
 			</argument>
 			<description>
@@ -148,12 +142,6 @@
 		<method name="operator -" qualifiers="operator">
 			<return type="Vector3i">
 			</return>
-			<description>
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
-			<return type="Vector3i">
-			</return>
 			<argument index="0" name="right" type="Vector3i">
 			</argument>
 			<description>
@@ -231,6 +219,18 @@
 			<description>
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="Vector3i">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="Vector3i">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="sign" qualifiers="const">
 			<return type="Vector3i">
 			</return>
diff --git a/doc/classes/float.xml b/doc/classes/float.xml
index f75c130039..585c847d22 100644
--- a/doc/classes/float.xml
+++ b/doc/classes/float.xml
@@ -145,16 +145,6 @@
 		<method name="operator +" qualifiers="operator">
 			<return type="float">
 			</return>
-			<description>
-				Unary plus operator. Doesn't have any effect.
-				[codeblock]
-				var a = +2.5 # a is 2.5.
-				[/codeblock]
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
-			<return type="float">
-			</return>
 			<argument index="0" name="right" type="float">
 			</argument>
 			<description>
@@ -173,17 +163,6 @@
 		<method name="operator -" qualifiers="operator">
 			<return type="float">
 			</return>
-			<description>
-				Unary minus operator. Negates the number.
-				[codeblock]
-				var a = -2.5 # a is -2.5.
-				print(-a) # 2.5
-				[/codeblock]
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
-			<return type="float">
-			</return>
 			<argument index="0" name="right" type="float">
 			</argument>
 			<description>
@@ -308,6 +287,18 @@
 				Returns [code]true[/code] if this [float] is greater than or equal to the given [int].
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="float">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="float">
+			</return>
+			<description>
+			</description>
+		</method>
 	</methods>
 	<constants>
 	</constants>
diff --git a/doc/classes/int.xml b/doc/classes/int.xml
index b0ad963998..95918c9007 100644
--- a/doc/classes/int.xml
+++ b/doc/classes/int.xml
@@ -126,21 +126,21 @@
 			</description>
 		</method>
 		<method name="operator *" qualifiers="operator">
-			<return type="float">
+			<return type="int">
 			</return>
-			<argument index="0" name="right" type="float">
+			<argument index="0" name="right" type="int">
 			</argument>
 			<description>
-				Multiplies an [int] and a [float]. The result is a [float].
+				Multiplies two [int]s.
 			</description>
 		</method>
 		<method name="operator *" qualifiers="operator">
-			<return type="int">
+			<return type="float">
 			</return>
-			<argument index="0" name="right" type="int">
+			<argument index="0" name="right" type="float">
 			</argument>
 			<description>
-				Multiplies two [int]s.
+				Multiplies an [int] and a [float]. The result is a [float].
 			</description>
 		</method>
 		<method name="operator *" qualifiers="operator">
@@ -204,16 +204,6 @@
 			</description>
 		</method>
 		<method name="operator +" qualifiers="operator">
-			<return type="int">
-			</return>
-			<description>
-				Unary plus operator. Doesn't have any effect.
-				[codeblock]
-				var a = +1 # a is 1.
-				[/codeblock]
-			</description>
-		</method>
-		<method name="operator +" qualifiers="operator">
 			<return type="float">
 			</return>
 			<argument index="0" name="right" type="float">
@@ -232,17 +222,6 @@
 			</description>
 		</method>
 		<method name="operator -" qualifiers="operator">
-			<return type="int">
-			</return>
-			<description>
-				Unary minus operator. Negates the number.
-				[codeblock]
-				var a = -1 # a is -1.
-				print(-a) # 1
-				[/codeblock]
-			</description>
-		</method>
-		<method name="operator -" qualifiers="operator">
 			<return type="float">
 			</return>
 			<argument index="0" name="right" type="float">
@@ -414,6 +393,18 @@
 				[/codeblock]
 			</description>
 		</method>
+		<method name="operator unary+" qualifiers="operator">
+			<return type="int">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="operator unary-" qualifiers="operator">
+			<return type="int">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="operator |" qualifiers="operator">
 			<return type="int">
 			</return>