-Restored multithread capability to VisualServer

-Restored resource previews!

servers/visual/visual_server_wrap_mt.cpp

@@ -0,0 +1,193 @@
+/*************************************************************************/
+/*  visual_server_wrap_mt.cpp                                            */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+#include "visual_server_wrap_mt.h"
+#include "global_config.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();
+	pool_max_size = GLOBAL_DEF("memory/servers/thread_rid_prealloc_amount", 20);
+
+	if (!p_create_thread) {
+		server_thread = Thread::get_caller_ID();
+	} else {
+		server_thread = 0;
+	}
+}
+
+VisualServerWrapMT::~VisualServerWrapMT() {
+
+	memdelete(visual_server);
+	memdelete(alloc_mutex);
+	//finish();
+}