/**************************************************************************/
/*  physics_server_2d_wrap_mt.cpp                                         */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/* distribute, sublicense, and/or sell copies of the Software, and to     */
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#include "physics_server_2d_wrap_mt.h"

#include "core/os/os.h"

void PhysicsServer2DWrapMT::thread_exit() {
	exit = true;
}

void PhysicsServer2DWrapMT::thread_step(real_t p_delta) {
	physics_server_2d->step(p_delta);
	step_sem.post();
}

void PhysicsServer2DWrapMT::thread_loop() {
	server_thread = Thread::get_caller_id();

	physics_server_2d->init();

	command_queue.set_pump_task_id(server_task_id);
	while (!exit) {
		WorkerThreadPool::get_singleton()->yield();
		command_queue.flush_all();
	}

	command_queue.flush_all();

	physics_server_2d->finish();
}

/* EVENT QUEUING */

void PhysicsServer2DWrapMT::step(real_t p_step) {
	if (create_thread) {
		command_queue.push(this, &PhysicsServer2DWrapMT::thread_step, p_step);
	} else {
		command_queue.flush_all(); // Flush all pending from other threads.
		physics_server_2d->step(p_step);
	}
}

void PhysicsServer2DWrapMT::sync() {
	if (create_thread) {
		step_sem.wait();
	}
	physics_server_2d->sync();
}

void PhysicsServer2DWrapMT::flush_queries() {
	physics_server_2d->flush_queries();
}

void PhysicsServer2DWrapMT::end_sync() {
	physics_server_2d->end_sync();
}

void PhysicsServer2DWrapMT::init() {
	if (create_thread) {
		exit = false;
		server_task_id = WorkerThreadPool::get_singleton()->add_task(callable_mp(this, &PhysicsServer2DWrapMT::thread_loop), true);
		step_sem.post();
	} else {
		physics_server_2d->init();
	}
}

void PhysicsServer2DWrapMT::finish() {
	if (create_thread) {
		command_queue.push(this, &PhysicsServer2DWrapMT::thread_exit);
		if (server_task_id != WorkerThreadPool::INVALID_TASK_ID) {
			WorkerThreadPool::get_singleton()->wait_for_task_completion(server_task_id);
			server_task_id = WorkerThreadPool::INVALID_TASK_ID;
		}
	} else {
		physics_server_2d->finish();
	}
}

PhysicsServer2DWrapMT::PhysicsServer2DWrapMT(PhysicsServer2D *p_contained, bool p_create_thread) {
	physics_server_2d = p_contained;
	create_thread = p_create_thread;
	if (!create_thread) {
		server_thread = Thread::MAIN_ID;
	}
}

PhysicsServer2DWrapMT::~PhysicsServer2DWrapMT() {
	memdelete(physics_server_2d);
}