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, 14 insertions, 6 deletions

diff --git a/servers/rendering/renderer_scene.h b/servers/rendering/renderer_scene.h
index d1379da045..b546001843 100644
--- a/servers/rendering/renderer_scene.h
+++ b/servers/rendering/renderer_scene.h
@@ -36,7 +36,8 @@
 
 class RendererScene {
 public:
-	virtual RID camera_create() = 0;
+	virtual RID camera_allocate() = 0;
+	virtual void camera_initialize(RID p_rid) = 0;
 
 	virtual void camera_set_perspective(RID p_camera, float p_fovy_degrees, float p_z_near, float p_z_far) = 0;
 	virtual void camera_set_orthogonal(RID p_camera, float p_size, float p_z_near, float p_z_far) = 0;
@@ -48,7 +49,8 @@ public:
 	virtual void camera_set_use_vertical_aspect(RID p_camera, bool p_enable) = 0;
 	virtual bool is_camera(RID p_camera) const = 0;
 
-	virtual RID scenario_create() = 0;
+	virtual RID scenario_allocate() = 0;
+	virtual void scenario_initialize(RID p_rid) = 0;
 
 	virtual void scenario_set_debug(RID p_scenario, RS::ScenarioDebugMode p_debug_mode) = 0;
 	virtual void scenario_set_environment(RID p_scenario, RID p_environment) = 0;
@@ -58,7 +60,8 @@ public:
 	virtual bool is_scenario(RID p_scenario) const = 0;
 	virtual RID scenario_get_environment(RID p_scenario) = 0;
 
-	virtual RID instance_create() = 0;
+	virtual RID instance_allocate() = 0;
+	virtual void instance_initialize(RID p_rid) = 0;
 
 	virtual void instance_set_base(RID p_instance, RID p_base) = 0;
 	virtual void instance_set_scenario(RID p_instance, RID p_scenario) = 0;
@@ -99,7 +102,9 @@ public:
 
 	/* SKY API */
 
-	virtual RID sky_create() = 0;
+	virtual RID sky_allocate() = 0;
+	virtual void sky_initialize(RID p_rid) = 0;
+
 	virtual void sky_set_radiance_size(RID p_sky, int p_radiance_size) = 0;
 	virtual void sky_set_mode(RID p_sky, RS::SkyMode p_samples) = 0;
 	virtual void sky_set_material(RID p_sky, RID p_material) = 0;
@@ -107,7 +112,8 @@ public:
 
 	/* ENVIRONMENT API */
 
-	virtual RID environment_create() = 0;
+	virtual RID environment_allocate() = 0;
+	virtual void environment_initialize(RID p_rid) = 0;
 
 	virtual void environment_set_background(RID p_env, RS::EnvironmentBG p_bg) = 0;
 	virtual void environment_set_sky(RID p_env, RID p_sky) = 0;
@@ -159,7 +165,8 @@ public:
 
 	/* Camera Effects */
 
-	virtual RID camera_effects_create() = 0;
+	virtual RID camera_effects_allocate() = 0;
+	virtual void camera_effects_initialize(RID p_rid) = 0;
 
 	virtual void camera_effects_set_dof_blur_quality(RS::DOFBlurQuality p_quality, bool p_use_jitter) = 0;
 	virtual void camera_effects_set_dof_blur_bokeh_shape(RS::DOFBokehShape p_shape) = 0;
@@ -177,6 +184,7 @@ public:
 	/* Render Buffers */
 
 	virtual RID render_buffers_create() = 0;
+
 	virtual void render_buffers_configure(RID p_render_buffers, RID p_render_target, int p_width, int p_height, RS::ViewportMSAA p_msaa, RS::ViewportScreenSpaceAA p_screen_space_aa, bool p_use_debanding) = 0;
 
 	virtual void gi_set_use_half_resolution(bool p_enable) = 0;