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Niels Martin Hansen

Change: Modernise music control logic implementation (#6839)

Rewrite of almost the entire music control logic to a more modern style, hopefully also easier to understand. The old playlist handling made it look like arcane magic, which it doesn't have to be.

- Playlists are now stored in std::vector of objects instead of arrays of bytes with magic sentinel values, that need to be rotated around all the time. Position in playlist is stored as a simple index.
- The theme song is now reserved for the title screen, it doesn't play on any of the standard playlists, but is still available for use on custom playlists.
- When the player enters/leaves the game from the main menu, the music always restarts.
- Playback state (playing or not) is kept even if music becomes unavailable due to an empty playlist (or an empty music set), so it can restart immediately if music becomes available again.
- The shuffle algorithm was changed to a standard Fisher-Yates.
- Possibly better behavior when editing a custom playlist while it's playing.
- Custom playlists should be compatible.
- Framework for supporting custom playlists with songs from multiple music sets.

/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file newgrf_class.h Header file for classes to be used by e.g. NewGRF stations and airports */

#ifndef NEWGRF_CLASS_H
#define NEWGRF_CLASS_H

#include "strings_type.h"

/**
 * Struct containing information relating to NewGRF classes for stations and airports.
 */
template <typename Tspec, typename Tid, Tid Tmax>
struct NewGRFClass {
private:
	uint count;       ///< Number of specs in this class.
	uint ui_count;    ///< Number of specs in this class potentially available to the user.
	Tspec **spec;     ///< Array of specifications.

	/**
	 * The actual classes.
	 * @note We store pointers to membes of this array in various places outside this class (e.g. to 'name' for GRF string resolving).
	 *       Thus this must be a static array, and cannot be a self-resizing SmallVector or similar.
	 */
	static NewGRFClass<Tspec, Tid, Tmax> classes[Tmax];

	void ResetClass();

	/** Initialise the defaults. */
	static void InsertDefaults();

public:
	uint32 global_id; ///< Global ID for class, e.g. 'DFLT', 'WAYP', etc.
	StringID name;    ///< Name of this class.

	void Insert(Tspec *spec);

	/** Get the number of allocated specs within the class. */
	uint GetSpecCount() const { return this->count; }
	/** Get the number of potentially user-available specs within the class. */
	uint GetUISpecCount() const { return this->ui_count; }
	int GetUIFromIndex(int index) const;
	int GetIndexFromUI(int ui_index) const;

	const Tspec *GetSpec(uint index) const;

	/** Check whether the spec will be available to the user at some point in time. */
	bool IsUIAvailable(uint index) const;

	static void Reset();
	static Tid Allocate(uint32 global_id);
	static void Assign(Tspec *spec);
	static uint GetClassCount();
	static uint GetUIClassCount();
	static Tid GetUIClass(uint index);
	static NewGRFClass *Get(Tid cls_id);

	static const Tspec *GetByGrf(uint32 grfid, byte local_id, int *index);
};

#endif /* NEWGRF_CLASS_H */