Deprecate RenderingServer's `has_feature` and Features enum

doc/classes/RenderingServer.xml

@@ -1556,11 +1556,11 @@
 				Returns [code]true[/code] if changes have been made to the RenderingServer's data. [method force_draw] is usually called if this happens.
 			</description>
 		</method>
-		<method name="has_feature" qualifiers="const">
+		<method name="has_feature" qualifiers="const" is_deprecated="true">
 			<return type="bool" />
 			<param index="0" name="feature" type="int" enum="RenderingServer.Features" />
 			<description>
-				Not yet implemented. Always returns [code]false[/code].
+				[i]Deprecated.[/i] This method has not been used since Godot 3.0. Always returns false.
 			</description>
 		</method>
 		<method name="has_os_feature" qualifiers="const">
@@ -5332,11 +5332,11 @@
 		<constant name="RENDERING_INFO_VIDEO_MEM_USED" value="5" enum="RenderingInfo">
 			Video memory used (in bytes). When using the Forward+ or mobile rendering backends, this is always greater than the sum of [constant RENDERING_INFO_TEXTURE_MEM_USED] and [constant RENDERING_INFO_BUFFER_MEM_USED], since there is miscellaneous data not accounted for by those two metrics. When using the GL Compatibility backend, this is equal to the sum of [constant RENDERING_INFO_TEXTURE_MEM_USED] and [constant RENDERING_INFO_BUFFER_MEM_USED].
 		</constant>
-		<constant name="FEATURE_SHADERS" value="0" enum="Features">
+		<constant name="FEATURE_SHADERS" value="0" enum="Features" is_deprecated="true">
-			Hardware supports shaders. This enum is currently unused in Godot 3.x.
+			[i]Deprecated.[/i] This constant has not been used since Godot 3.0.
 		</constant>
-		<constant name="FEATURE_MULTITHREADED" value="1" enum="Features">
+		<constant name="FEATURE_MULTITHREADED" value="1" enum="Features" is_deprecated="true">
-			Hardware supports multithreading. This enum is currently unused in Godot 3.x.
+			[i]Deprecated.[/i] This constant has not been used since Godot 3.0.
 		</constant>
 	</constants>
 </class>

servers/rendering/rendering_server_default.cpp

@@ -287,9 +287,11 @@ void RenderingServerDefault::set_default_clear_color(const Color &p_color) {
 	RSG::viewport->set_default_clear_color(p_color);
 }
 
+#ifndef DISABLE_DEPRECATED
 bool RenderingServerDefault::has_feature(Features p_feature) const {
 	return false;
 }
+#endif
 
 void RenderingServerDefault::sdfgi_set_debug_probe_select(const Vector3 &p_position, const Vector3 &p_dir) {
 	RSG::scene->sdfgi_set_debug_probe_select(p_position, p_dir);

servers/rendering/rendering_server_default.h

@@ -1021,7 +1021,9 @@ public:
 	virtual Color get_default_clear_color() override;
 	virtual void set_default_clear_color(const Color &p_color) override;
 
+#ifndef DISABLE_DEPRECATED
 	virtual bool has_feature(Features p_feature) const override;
+#endif
 
 	virtual bool has_os_feature(const String &p_feature) const override;
 	virtual void set_debug_generate_wireframes(bool p_generate) override;

servers/rendering_server.cpp

@@ -3362,7 +3362,6 @@ void RenderingServer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_default_clear_color"), &RenderingServer::get_default_clear_color);
 	ClassDB::bind_method(D_METHOD("set_default_clear_color", "color"), &RenderingServer::set_default_clear_color);
 
-	ClassDB::bind_method(D_METHOD("has_feature", "feature"), &RenderingServer::has_feature);
 	ClassDB::bind_method(D_METHOD("has_os_feature", "feature"), &RenderingServer::has_os_feature);
 	ClassDB::bind_method(D_METHOD("set_debug_generate_wireframes", "generate"), &RenderingServer::set_debug_generate_wireframes);
 
@@ -3380,9 +3379,6 @@ void RenderingServer::_bind_methods() {
 	BIND_ENUM_CONSTANT(RENDERING_INFO_BUFFER_MEM_USED);
 	BIND_ENUM_CONSTANT(RENDERING_INFO_VIDEO_MEM_USED);
 
-	BIND_ENUM_CONSTANT(FEATURE_SHADERS);
-	BIND_ENUM_CONSTANT(FEATURE_MULTITHREADED);
-
 	ADD_SIGNAL(MethodInfo("frame_pre_draw"));
 	ADD_SIGNAL(MethodInfo("frame_post_draw"));
 
@@ -3392,6 +3388,13 @@ void RenderingServer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("create_local_rendering_device"), &RenderingServer::create_local_rendering_device);
 
 	ClassDB::bind_method(D_METHOD("call_on_render_thread", "callable"), &RenderingServer::call_on_render_thread);
+
+#ifndef DISABLE_DEPRECATED
+	ClassDB::bind_method(D_METHOD("has_feature", "feature"), &RenderingServer::has_feature);
+
+	BIND_ENUM_CONSTANT(FEATURE_SHADERS);
+	BIND_ENUM_CONSTANT(FEATURE_MULTITHREADED);
+#endif
 }
 
 void RenderingServer::mesh_add_surface_from_mesh_data(RID p_mesh, const Geometry3D::MeshData &p_mesh_data) {

servers/rendering_server.h

@@ -1612,13 +1612,14 @@ public:
 	virtual Color get_default_clear_color() = 0;
 	virtual void set_default_clear_color(const Color &p_color) = 0;
 
+#ifndef DISABLE_DEPRECATED
+	// Never actually used, should be removed when we can break compatibility.
 	enum Features {
 		FEATURE_SHADERS,
 		FEATURE_MULTITHREADED,
 	};
-
 	virtual bool has_feature(Features p_feature) const = 0;
-
+#endif
 	virtual bool has_os_feature(const String &p_feature) const = 0;
 
 	virtual void set_debug_generate_wireframes(bool p_generate) = 0;
@@ -1748,10 +1749,13 @@ VARIANT_ENUM_CAST(RenderingServer::CanvasLightShadowFilter);
 VARIANT_ENUM_CAST(RenderingServer::CanvasOccluderPolygonCullMode);
 VARIANT_ENUM_CAST(RenderingServer::GlobalShaderParameterType);
 VARIANT_ENUM_CAST(RenderingServer::RenderingInfo);
-VARIANT_ENUM_CAST(RenderingServer::Features);
 VARIANT_ENUM_CAST(RenderingServer::CanvasTextureChannel);
 VARIANT_ENUM_CAST(RenderingServer::BakeChannels);
 
+#ifndef DISABLE_DEPRECATED
+VARIANT_ENUM_CAST(RenderingServer::Features);
+#endif
+
 // Alias to make it easier to use.
 #define RS RenderingServer