Make Servers truly Thread Safe

-Rendering server now uses a split RID allocate/initialize internally, this allows generating RIDs immediately but initialization to happen later on the proper thread (as rendering APIs generally requiere to call on the right thread).
-RenderingServerWrapMT is no more, multithreading is done in RenderingServerDefault.
-Some functions like texture or mesh creation, when renderer supports it, can register and return immediately (so no waiting for server API to flush, and saving staging and command buffer memory).
-3D physics server changed to be made multithread friendly.
-Added PhysicsServer3DWrapMT to use 3D physics server from multiple threads.
-Disablet Bullet (too much effort to make multithread friendly, this needs to be fixed eventually).

1 files changed, 12 insertions, 6 deletions

diff --git a/servers/rendering/renderer_viewport.cpp b/servers/rendering/renderer_viewport.cpp
index d52da5b331..fc3d8a78e7 100644
--- a/servers/rendering/renderer_viewport.cpp
+++ b/servers/rendering/renderer_viewport.cpp
@@ -608,19 +608,20 @@ void RendererViewport::draw_viewports() {
 	}
 }
 
-RID RendererViewport::viewport_create() {
-	Viewport *viewport = memnew(Viewport);
-
-	RID rid = viewport_owner.make_rid(viewport);
+RID RendererViewport::viewport_allocate() {
+	return viewport_owner.allocate_rid();
+}
 
-	viewport->self = rid;
+void RendererViewport::viewport_initialize(RID p_rid) {
+	Viewport *viewport = memnew(Viewport);
+	viewport->self = p_rid;
 	viewport->hide_scenario = false;
 	viewport->hide_canvas = false;
 	viewport->render_target = RSG::storage->render_target_create();
 	viewport->shadow_atlas = RSG::scene->shadow_atlas_create();
 	viewport->viewport_render_direct_to_screen = false;
 
-	return rid;
+	viewport_owner.initialize_rid(p_rid, viewport);
 }
 
 void RendererViewport::viewport_set_use_xr(RID p_viewport, bool p_use_xr) {
@@ -1019,5 +1020,10 @@ void RendererViewport::set_default_clear_color(const Color &p_color) {
 	RSG::storage->set_default_clear_color(p_color);
 }
 
+//workaround for setting this on thread
+void RendererViewport::call_set_use_vsync(bool p_enable) {
+	DisplayServer::get_singleton()->_set_use_vsync(p_enable);
+}
+
 RendererViewport::RendererViewport() {
 }