Implement Vector4, Vector4i, Projection

Implement built-in classes Vector4, Vector4i and Projection.

* Two versions of Vector4 (float and integer).
* A Projection class, which is a 4x4 matrix specialized in projection types.

These types have been requested for a long time, but given they were very corner case they were not added before.
Because in Godot 4, reimplementing parts of the rendering engine is now possible, access to these types (heavily used by the rendering code) becomes a necessity.

**Q**: Why Projection and not Matrix4?
**A**: Godot does not use Matrix2, Matrix3, Matrix4x3, etc. naming convention because, within the engine, these types always have a *purpose*. As such, Godot names them: Transform2D, Transform3D or Basis. In this case, this 4x4 matrix is _always_ used as a _Projection_, hence the naming.

2 files changed, 19 insertions, 0 deletions

diff --git a/modules/mono/editor/bindings_generator.cpp b/modules/mono/editor/bindings_generator.cpp
index 7cc195201b..2e628cb576 100644
--- a/modules/mono/editor/bindings_generator.cpp
+++ b/modules/mono/editor/bindings_generator.cpp
@@ -917,6 +917,8 @@ void BindingsGenerator::_generate_array_extensions(StringBuilder &p_output) {
 	ARRAY_ALL(Vector2i);
 	ARRAY_ALL(Vector3);
 	ARRAY_ALL(Vector3i);
+	ARRAY_ALL(Vector4);
+	ARRAY_ALL(Vector4i);
 
 #undef ARRAY_ALL
 #undef ARRAY_IS_EMPTY
@@ -3222,6 +3224,11 @@ bool BindingsGenerator::_arg_default_value_from_variant(const Variant &p_val, Ar
 			r_iarg.default_argument = "new %s" + r_iarg.default_argument;
 			r_iarg.def_param_mode = ArgumentInterface::NULLABLE_VAL;
 			break;
+		case Variant::VECTOR4:
+		case Variant::VECTOR4I:
+			r_iarg.default_argument = "new %s" + r_iarg.default_argument;
+			r_iarg.def_param_mode = ArgumentInterface::NULLABLE_VAL;
+			break;
 		case Variant::OBJECT:
 			ERR_FAIL_COND_V_MSG(!p_val.is_zero(), false,
 					"Parameter of type '" + String(r_iarg.type.cname) + "' can only have null/zero as the default value.");
@@ -3276,6 +3283,15 @@ bool BindingsGenerator::_arg_default_value_from_variant(const Variant &p_val, Ar
 			}
 			r_iarg.def_param_mode = ArgumentInterface::NULLABLE_VAL;
 		} break;
+		case Variant::PROJECTION: {
+			Projection transform = p_val.operator Projection();
+			if (transform == Projection()) {
+				r_iarg.default_argument = "Projection.Identity";
+			} else {
+				r_iarg.default_argument = "new Projection(new Vector4" + transform.matrix[0].operator String() + ", new Vector4" + transform.matrix[1].operator String() + ", new Vector4" + transform.matrix[2].operator String() + ", new Vector4" + transform.matrix[3].operator String() + ")";
+			}
+			r_iarg.def_param_mode = ArgumentInterface::NULLABLE_VAL;
+		} break;
 		case Variant::BASIS: {
 			Basis basis = p_val.operator Basis();
 			if (basis == Basis()) {
diff --git a/modules/mono/editor/bindings_generator.h b/modules/mono/editor/bindings_generator.h
index 1547d0ed2f..ee170e4558 100644
--- a/modules/mono/editor/bindings_generator.h
+++ b/modules/mono/editor/bindings_generator.h
@@ -590,6 +590,9 @@ class BindingsGenerator {
 		StringName type_Vector2 = StaticCString::create("Vector2");
 		StringName type_Rect2 = StaticCString::create("Rect2");
 		StringName type_Vector3 = StaticCString::create("Vector3");
+		StringName type_Vector3i = StaticCString::create("Vector3i");
+		StringName type_Vector4 = StaticCString::create("Vector4");
+		StringName type_Vector4i = StaticCString::create("Vector4i");
 
 		// Object not included as it must be checked for all derived classes
 		static constexpr int nullable_types_count = 17;