cpp/openttd-patchpack/source Files · src/music/null_m.h

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yexo

(svn r16502) -Fix [FS#2935]: when an AI was suspended while in a function called (indirectly) via call/acall/pcall OpenTTD crashed. Fix this by disallowing AIs to be suspended while called via call/acall/pcall.
IMPORTANT FOR AI WRITERS: AIs can no longer call any DoCommand functions (change anything, build vehicles, etc.) in a function called (indirectly) via call/acall/pcall. Where possible, please rewrite your code so it doesn't use call/acall/pcall

/* $Id$ */

/** @file null_m.h Base for the silent music playback. */

#ifndef MUSIC_NULL_H
#define MUSIC_NULL_H

#include "music_driver.hpp"

class MusicDriver_Null: public MusicDriver {
public:
	/* virtual */ const char *Start(const char * const *param) { return NULL; }

	/* virtual */ void Stop() { }

	/* virtual */ void PlaySong(const char *filename) { }

	/* virtual */ void StopSong() { }

	/* virtual */ bool IsSongPlaying() { return true; }

	/* virtual */ void SetVolume(byte vol) { }
};

class FMusicDriver_Null: public MusicDriverFactory<FMusicDriver_Null> {
public:
	static const int priority = 0;
	/* virtual */ const char *GetName() { return "null"; }
	/* virtual */ const char *GetDescription() { return "Null Music Driver"; }
	/* virtual */ Driver *CreateInstance() { return new MusicDriver_Null(); }
};

#endif /* MUSIC_NULL_H */