refacto: rendering engine singleton removal step 1 (filesystem)

Make the RenderingEngine filesystem member non accessible from everywhere

This permits also to determine that some lua code has directly a logic to extract zip file. Move this logic inside client, it's not the lua stack role to perform a such complex operation

Found also another irrlicht <1.8 compat code to remove

5 files changed, 84 insertions, 86 deletions

diff --git a/src/client/client.cpp b/src/client/client.cpp
index 5db0b8f5d..d7e69f349 100644
--- a/src/client/client.cpp
+++ b/src/client/client.cpp
@@ -97,6 +97,7 @@ Client::Client(
 		NodeDefManager *nodedef,
 		ISoundManager *sound,
 		MtEventManager *event,
+		RenderingEngine *rendering_engine,
 		bool ipv6,
 		GameUI *game_ui
 ):
@@ -106,6 +107,7 @@ Client::Client(
 	m_nodedef(nodedef),
 	m_sound(sound),
 	m_event(event),
+	m_rendering_engine(rendering_engine),
 	m_mesh_update_thread(this),
 	m_env(
 		new ClientMap(this, control, 666),
@@ -660,8 +662,8 @@ bool Client::loadMedia(const std::string &data, const std::string &filename,
 		TRACESTREAM(<< "Client: Attempting to load image "
 			<< "file \"" << filename << "\"" << std::endl);
 
-		io::IFileSystem *irrfs = RenderingEngine::get_filesystem();
-		video::IVideoDriver *vdrv = RenderingEngine::get_video_driver();
+		io::IFileSystem *irrfs = m_rendering_engine->get_filesystem();
+		video::IVideoDriver *vdrv = m_rendering_engine->get_video_driver();
 
 		io::IReadFile *rfile = irrfs->createMemoryReadFile(
 				data.c_str(), data.size(), "_tempreadfile");
@@ -728,6 +730,72 @@ bool Client::loadMedia(const std::string &data, const std::string &filename,
 	return false;
 }
 
+bool Client::extractZipFile(const char *filename, const std::string &destination)
+{
+	auto fs = m_rendering_engine->get_filesystem();
+
+	if (!fs->addFileArchive(filename, false, false, io::EFAT_ZIP)) {
+		return false;
+	}
+
+	sanity_check(fs->getFileArchiveCount() > 0);
+
+	/**********************************************************************/
+	/* WARNING this is not threadsafe!!                                   */
+	/**********************************************************************/
+	io::IFileArchive* opened_zip = fs->getFileArchive(fs->getFileArchiveCount() - 1);
+
+	const io::IFileList* files_in_zip = opened_zip->getFileList();
+
+	unsigned int number_of_files = files_in_zip->getFileCount();
+
+	for (unsigned int i=0; i < number_of_files; i++) {
+		std::string fullpath = destination;
+		fullpath += DIR_DELIM;
+		fullpath += files_in_zip->getFullFileName(i).c_str();
+		std::string fullpath_dir = fs::RemoveLastPathComponent(fullpath);
+
+		if (!files_in_zip->isDirectory(i)) {
+			if (!fs::PathExists(fullpath_dir) && !fs::CreateAllDirs(fullpath_dir)) {
+				fs->removeFileArchive(fs->getFileArchiveCount()-1);
+				return false;
+			}
+
+			io::IReadFile* toread = opened_zip->createAndOpenFile(i);
+
+			FILE *targetfile = fopen(fullpath.c_str(),"wb");
+
+			if (targetfile == NULL) {
+				fs->removeFileArchive(fs->getFileArchiveCount()-1);
+				return false;
+			}
+
+			char read_buffer[1024];
+			long total_read = 0;
+
+			while (total_read < toread->getSize()) {
+
+				unsigned int bytes_read =
+						toread->read(read_buffer,sizeof(read_buffer));
+				if ((bytes_read == 0 ) ||
+					(fwrite(read_buffer, 1, bytes_read, targetfile) != bytes_read))
+				{
+					fclose(targetfile);
+					fs->removeFileArchive(fs->getFileArchiveCount() - 1);
+					return false;
+				}
+				total_read += bytes_read;
+			}
+
+			fclose(targetfile);
+		}
+
+	}
+
+	fs->removeFileArchive(fs->getFileArchiveCount() - 1);
+	return true;
+}
+
 // Virtual methods from con::PeerHandler
 void Client::peerAdded(con::Peer *peer)
 {
@@ -1910,23 +1978,17 @@ scene::IAnimatedMesh* Client::getMesh(const std::string &filename, bool cache)
 
 	// Create the mesh, remove it from cache and return it
 	// This allows unique vertex colors and other properties for each instance
-#if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR > 8
-	io::IReadFile *rfile = RenderingEngine::get_filesystem()->createMemoryReadFile(
+	io::IReadFile *rfile = m_rendering_engine->get_filesystem()->createMemoryReadFile(
 			data.c_str(), data.size(), filename.c_str());
-#else
-	Buffer<char> data_rw(data.c_str(), data.size()); // Const-incorrect Irrlicht
-	io::IReadFile *rfile = RenderingEngine::get_filesystem()->createMemoryReadFile(
-			*data_rw, data_rw.getSize(), filename.c_str());
-#endif
 	FATAL_ERROR_IF(!rfile, "Could not create/open RAM file");
 
-	scene::IAnimatedMesh *mesh = RenderingEngine::get_scene_manager()->getMesh(rfile);
+	scene::IAnimatedMesh *mesh = m_rendering_engine->get_scene_manager()->getMesh(rfile);
 	rfile->drop();
 	if (!mesh)
 		return nullptr;
 	mesh->grab();
 	if (!cache)
-		RenderingEngine::get_mesh_cache()->removeMesh(mesh);
+		m_rendering_engine->get_mesh_cache()->removeMesh(mesh);
 	return mesh;
 }
 
diff --git a/src/client/client.h b/src/client/client.h
index 2dba1506e..bcb7d6b09 100644
--- a/src/client/client.h
+++ b/src/client/client.h
@@ -45,6 +45,7 @@ struct ClientEvent;
 struct MeshMakeData;
 struct ChatMessage;
 class MapBlockMesh;
+class RenderingEngine;
 class IWritableTextureSource;
 class IWritableShaderSource;
 class IWritableItemDefManager;
@@ -123,6 +124,7 @@ public:
 			NodeDefManager *nodedef,
 			ISoundManager *sound,
 			MtEventManager *event,
+			RenderingEngine *rendering_engine,
 			bool ipv6,
 			GameUI *game_ui
 	);
@@ -379,6 +381,9 @@ public:
 	// Insert a media file appropriately into the appropriate manager
 	bool loadMedia(const std::string &data, const std::string &filename,
 		bool from_media_push = false);
+
+	bool extractZipFile(const char *filename, const std::string &destination);
+
 	// Send a request for conventional media transfer
 	void request_media(const std::vector<std::string> &file_requests);
 
@@ -469,6 +474,7 @@ private:
 	NodeDefManager *m_nodedef;
 	ISoundManager *m_sound;
 	MtEventManager *m_event;
+	RenderingEngine *m_rendering_engine;
 
 
 	MeshUpdateThread m_mesh_update_thread;
diff --git a/src/client/game.cpp b/src/client/game.cpp
index b092b95e2..612072136 100644
--- a/src/client/game.cpp
+++ b/src/client/game.cpp
@@ -1465,7 +1465,7 @@ bool Game::connectToServer(const GameStartData &start_data,
 			start_data.password, start_data.address,
 			*draw_control, texture_src, shader_src,
 			itemdef_manager, nodedef_manager, sound, eventmgr,
-			connect_address.isIPv6(), m_game_ui.get());
+			RenderingEngine::get_instance(), connect_address.isIPv6(), m_game_ui.get());
 
 	client->m_simple_singleplayer_mode = simple_singleplayer_mode;
 
diff --git a/src/client/renderingengine.h b/src/client/renderingengine.h
index 34cc60630..5807421ef 100644
--- a/src/client/renderingengine.h
+++ b/src/client/renderingengine.h
@@ -59,10 +59,9 @@ public:
 
 	static RenderingEngine *get_instance() { return s_singleton; }
 
-	static io::IFileSystem *get_filesystem()
+	io::IFileSystem *get_filesystem()
 	{
-		sanity_check(s_singleton && s_singleton->m_device);
-		return s_singleton->m_device->getFileSystem();
+		return m_device->getFileSystem();
 	}
 
 	static video::IVideoDriver *get_video_driver()
diff --git a/src/script/lua_api/l_mainmenu.cpp b/src/script/lua_api/l_mainmenu.cpp
index 6488cd0fc..1e8dea909 100644
--- a/src/script/lua_api/l_mainmenu.cpp
+++ b/src/script/lua_api/l_mainmenu.cpp
@@ -34,9 +34,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "serverlist.h"
 #include "mapgen/mapgen.h"
 #include "settings.h"
-
-#include <IFileArchive.h>
-#include <IFileSystem.h>
+#include "client/client.h"
 #include "client/renderingengine.h"
 #include "network/networkprotocol.h"
 
@@ -630,74 +628,7 @@ int ModApiMainMenu::l_extract_zip(lua_State *L)
 
 	if (ModApiMainMenu::mayModifyPath(absolute_destination)) {
 		fs::CreateAllDirs(absolute_destination);
-
-		io::IFileSystem *fs = RenderingEngine::get_filesystem();
-
-		if (!fs->addFileArchive(zipfile, false, false, io::EFAT_ZIP)) {
-			lua_pushboolean(L,false);
-			return 1;
-		}
-
-		sanity_check(fs->getFileArchiveCount() > 0);
-
-		/**********************************************************************/
-		/* WARNING this is not threadsafe!!                                   */
-		/**********************************************************************/
-		io::IFileArchive* opened_zip =
-			fs->getFileArchive(fs->getFileArchiveCount()-1);
-
-		const io::IFileList* files_in_zip = opened_zip->getFileList();
-
-		unsigned int number_of_files = files_in_zip->getFileCount();
-
-		for (unsigned int i=0; i < number_of_files; i++) {
-			std::string fullpath = destination;
-			fullpath += DIR_DELIM;
-			fullpath += files_in_zip->getFullFileName(i).c_str();
-			std::string fullpath_dir = fs::RemoveLastPathComponent(fullpath);
-
-			if (!files_in_zip->isDirectory(i)) {
-				if (!fs::PathExists(fullpath_dir) && !fs::CreateAllDirs(fullpath_dir)) {
-					fs->removeFileArchive(fs->getFileArchiveCount()-1);
-					lua_pushboolean(L,false);
-					return 1;
-				}
-
-				io::IReadFile* toread = opened_zip->createAndOpenFile(i);
-
-				FILE *targetfile = fopen(fullpath.c_str(),"wb");
-
-				if (targetfile == NULL) {
-					fs->removeFileArchive(fs->getFileArchiveCount()-1);
-					lua_pushboolean(L,false);
-					return 1;
-				}
-
-				char read_buffer[1024];
-				long total_read = 0;
-
-				while (total_read < toread->getSize()) {
-
-					unsigned int bytes_read =
-							toread->read(read_buffer,sizeof(read_buffer));
-					if ((bytes_read == 0 ) ||
-						(fwrite(read_buffer, 1, bytes_read, targetfile) != bytes_read))
-					{
-						fclose(targetfile);
-						fs->removeFileArchive(fs->getFileArchiveCount()-1);
-						lua_pushboolean(L,false);
-						return 1;
-					}
-					total_read += bytes_read;
-				}
-
-				fclose(targetfile);
-			}
-
-		}
-
-		fs->removeFileArchive(fs->getFileArchiveCount()-1);
-		lua_pushboolean(L,true);
+		lua_pushboolean(L, getClient(L)->extractZipFile(zipfile, destination));
 		return 1;
 	}