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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 tile_type.h Types related to tiles. */

#ifndef TILE_TYPE_H
#define TILE_TYPE_H

static const uint TILE_SIZE           = 16;                    ///< Tile size in world coordinates.
static const uint TILE_UNIT_MASK      = TILE_SIZE - 1;         ///< For masking in/out the inner-tile world coordinate units.
static const uint TILE_PIXELS         = 32;                    ///< Pixel distance between tile columns/rows in #ZOOM_LVL_BASE.
static const uint TILE_HEIGHT         =  8;                    ///< Height of a height level in world coordinate AND in pixels in #ZOOM_LVL_BASE.

static const uint MAX_BUILDING_PIXELS = 200;                   ///< Maximum height of a building in pixels in #ZOOM_LVL_BASE. (Also applies to "bridge buildings" on the bridge floor.)
static const int MAX_VEHICLE_PIXEL_X  = 192;                   ///< Maximum width of a vehicle in pixels in #ZOOM_LVL_BASE.
static const int MAX_VEHICLE_PIXEL_Y  = 96;                    ///< Maximum height of a vehicle in pixels in #ZOOM_LVL_BASE.

static const uint MAX_TILE_HEIGHT     = 255;                   ///< Maximum allowed tile height

static const uint MIN_MAX_HEIGHTLEVEL = 15;                    ///< Lower bound of maximum allowed heightlevel (in the construction settings)
static const uint DEF_MAX_HEIGHTLEVEL = 30;                    ///< Default maximum allowed heightlevel (in the construction settings)
static const uint MAX_MAX_HEIGHTLEVEL = MAX_TILE_HEIGHT;       ///< Upper bound of maximum allowed heightlevel (in the construction settings)

static const uint MIN_SNOWLINE_HEIGHT = 2;                     ///< Minimum snowline height
static const uint DEF_SNOWLINE_HEIGHT = 15;                    ///< Default snowline height
static const uint MAX_SNOWLINE_HEIGHT = (MAX_TILE_HEIGHT - 2); ///< Maximum allowed snowline height


/**
 * The different types of tiles.
 *
 * Each tile belongs to one type, according whatever is build on it.
 *
 * @note A railway with a crossing street is marked as MP_ROAD.
 */
enum TileType {
	MP_CLEAR,               ///< A tile without any structures, i.e. grass, rocks, farm fields etc.
	MP_RAILWAY,             ///< A railway
	MP_ROAD,                ///< A tile with road (or tram tracks)
	MP_HOUSE,               ///< A house by a town
	MP_TREES,               ///< Tile got trees
	MP_STATION,             ///< A tile of a station
	MP_WATER,               ///< Water tile
	MP_VOID,                ///< Invisible tiles at the SW and SE border
	MP_INDUSTRY,            ///< Part of an industry
	MP_TUNNELBRIDGE,        ///< Tunnel entry/exit and bridge heads
	MP_OBJECT,              ///< Contains objects such as transmitters and owned land
};

/**
 * Additional infos of a tile on a tropic game.
 *
 * The tropiczone is not modified during gameplay. It mainly affects tree growth. (desert tiles are visible though)
 *
 * In randomly generated maps:
 *  TROPICZONE_DESERT: Generated everywhere, if there is neither water nor mountains (TileHeight >= 4) in a certain distance from the tile.
 *  TROPICZONE_RAINFOREST: Generated everywhere, if there is no desert in a certain distance from the tile.
 *  TROPICZONE_NORMAL: Everywhere else, i.e. between desert and rainforest and on sea (if you clear the water).
 *
 * In scenarios:
 *  TROPICZONE_NORMAL: Default value.
 *  TROPICZONE_DESERT: Placed manually.
 *  TROPICZONE_RAINFOREST: Placed if you plant certain rainforest-trees.
 */
enum TropicZone {
	TROPICZONE_NORMAL     = 0,      ///< Normal tropiczone
	TROPICZONE_DESERT     = 1,      ///< Tile is desert
	TROPICZONE_RAINFOREST = 2,      ///< Rainforest tile
};

/**
 * The index/ID of a Tile.
 */
typedef uint32 TileIndex;

/**
 * The very nice invalid tile marker
 */
static const TileIndex INVALID_TILE = (TileIndex)-1;

#endif /* TILE_TYPE_H */