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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 rev.cpp Autogenerated file with the revision and such of OpenTTD. */

#include "stdafx.h"
#include "core/bitmath_func.hpp"
#include "rev.h"

#include "safeguards.h"

/**
 * Is this version of OpenTTD a release version?
 * @return True if it is a release version.
 */
bool IsReleasedVersion()
{
	return HasBit(_openttd_newgrf_version, 19);
}

/**
 * The text version of OpenTTD's revision.
 * This will be either
 * - "<tag>", like "<major>.<minor>.<build>[-RC<rc>]",
 * - "<commitdate>-g<shorthash><modified>" in "master",
 * - "<commitdate>-<branch>-g<shorthash><modified>" in other branches, or
 * - "norev000", if the version is unknown.
 *
 * The major, minor and build are the numbers that describe releases of
 * OpenTTD (like 0.5.3). "-RC" is used to flag release candidates.
 *
 * <modified> shows a "M", if the binary is made from modified source code.
 */
const char _openttd_revision[] = "!!VERSION!!";

/**
 * The text version of OpenTTD's build date.
 * Updating the build date in this file is the safest as it generally gets
 * updated for each revision in contrary to most other files that only see
 * updates when they are actually changed themselves.
 */
const char _openttd_build_date[] = __DATE__ " " __TIME__;

/**
 * Let us know if current build was modified. This detection
 * works even in the case when revision string is overridden by
 * --revision argument.
 * Value 0 means no modification, 1 is for unknown state
 * (compiling from sources without any version control software)
 * and 2 is for modified revision.
 */
const byte _openttd_revision_modified = !!MODIFIED!!;

/**
 * The NewGRF revision of OTTD:
 * bits  meaning.
 * 28-31 major version
 * 24-27 minor version
 * 20-23 build
 *    19 1 if it is a release, 0 if it is not.
 *  0-18 used to be the SVN revision, currently unused
 *
 * The 19th bit is there so the development/betas/alpha, etc. leading to a
 * final release will always have a lower version number than the released
 * version, thus making comparisons on specific revisions easy.
 */
const uint32 _openttd_newgrf_version = 1 << 28 | 9 << 24 | 0 << 20 | 0 << 19;

#ifdef __MORPHOS__
/**
 * Variable used by MorphOS to show the version.
 */
extern const char morphos_versions_tag[] = "$VER: OpenTTD !!VERSION!! (!!DATE!!) OpenTTD Team [MorphOS, PowerPC]";
#endif