godot/servers/visual/visual_server_wrap_mt.cpp

/*************************************************************************/
/*  visual_server_wrap_mt.cpp                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "visual_server_wrap_mt.h"
#include "globals.h"
#include "os/os.h"
void VisualServerWrapMT::thread_exit() {

	exit = true;
}

void VisualServerWrapMT::thread_draw() {

	draw_mutex->lock();

	draw_pending--;
	bool draw = (draw_pending == 0); // only draw when no more flushes are pending

	draw_mutex->unlock();

	if (draw) {

		visual_server->draw();
	}
}

void VisualServerWrapMT::thread_flush() {

	draw_mutex->lock();

	draw_pending--;

	draw_mutex->unlock();
}

void VisualServerWrapMT::_thread_callback(void *_instance) {

	VisualServerWrapMT *vsmt = reinterpret_cast<VisualServerWrapMT *>(_instance);

	vsmt->thread_loop();
}

void VisualServerWrapMT::thread_loop() {

	server_thread = Thread::get_caller_ID();

	OS::get_singleton()->make_rendering_thread();

	visual_server->init();

	exit = false;
	draw_thread_up = true;
	while (!exit) {
		// flush commands one by one, until exit is requested
		command_queue.wait_and_flush_one();
	}

	command_queue.flush_all(); // flush all

	visual_server->finish();
}

/* EVENT QUEUING */

void VisualServerWrapMT::sync() {

	if (create_thread) {

		/* TODO: sync with the thread */

		/*
		ERR_FAIL_COND(!draw_mutex);
		draw_mutex->lock();
		draw_pending++; //cambiar por un saferefcount
		draw_mutex->unlock();
		*/
		//command_queue.push( this, &VisualServerWrapMT::thread_flush);
	} else {

		command_queue.flush_all(); //flush all pending from other threads
	}
}

void VisualServerWrapMT::draw() {

	if (create_thread) {

		/* TODO: Make it draw
		ERR_FAIL_COND(!draw_mutex);
		draw_mutex->lock();
		draw_pending++; //cambiar por un saferefcount
		draw_mutex->unlock();

		command_queue.push( this, &VisualServerWrapMT::thread_draw);
		*/
	} else {

		visual_server->draw();
	}
}

void VisualServerWrapMT::init() {

	if (create_thread) {

		draw_mutex = Mutex::create();
		print_line("Creating render thread");
		OS::get_singleton()->release_rendering_thread();
		if (create_thread) {
			thread = Thread::create(_thread_callback, this);
			print_line("Starting render thread");
		}
		while (!draw_thread_up) {
			OS::get_singleton()->delay_usec(1000);
		}
		print_line("Done render thread");
	} else {

		visual_server->init();
	}
}

void VisualServerWrapMT::finish() {

	if (thread) {

		command_queue.push(this, &VisualServerWrapMT::thread_exit);
		Thread::wait_to_finish(thread);
		memdelete(thread);

		texture_free_cached_ids();
		mesh_free_cached_ids();

		thread = NULL;
	} else {
		visual_server->finish();
	}

	if (draw_mutex)
		memdelete(draw_mutex);
}

VisualServerWrapMT::VisualServerWrapMT(VisualServer *p_contained, bool p_create_thread) :
		command_queue(p_create_thread) {

	visual_server = p_contained;
	create_thread = p_create_thread;
	thread = NULL;
	draw_mutex = NULL;
	draw_pending = 0;
	draw_thread_up = false;
	alloc_mutex = Mutex::create();
	texture_pool_max_size = GLOBAL_DEF("render/thread_textures_prealloc", 5);
	mesh_pool_max_size = GLOBAL_DEF("core/rid_pool_prealloc", 20);
	if (!p_create_thread) {
		server_thread = Thread::get_caller_ID();
	} else {
		server_thread = 0;
	}
}

VisualServerWrapMT::~VisualServerWrapMT() {

	memdelete(visual_server);
	memdelete(alloc_mutex);
	//finish();
}