From 8982fff1b79aa3cc53a5c328b283e0f102cb647f Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Mon, 21 Mar 2011 15:42:17 +0100
Subject: AUDIO: Add pure virtual MidiDriver::isOpen() method

This in turn enables modifying MidiDriver_MPU401::close() to allow
it to be called on a midi driver that has not yet been opened.

The specific issue that triggered me to make these changes was a
crash-upon-quit in HUGO, caused by it instantiating a midi driver,
then encountering an error (missing hugo.dat) *before* having
opened the new midi driver; the general cleanup code then tries
to close the (not yet opened) midi driver -> kaboom

Also fixed some engines which were leaking MidiDriver instances.
---
 engines/agos/midi.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'engines/agos/midi.h')

diff --git a/engines/agos/midi.h b/engines/agos/midi.h
index 9c8303ba3c..c27c5a7973 100644
--- a/engines/agos/midi.h
+++ b/engines/agos/midi.h
@@ -115,6 +115,7 @@ public:
 public:
 	// MidiDriver interface implementation
 	int open();
+	bool isOpen() const;
 	void close();
 	void send(uint32 b);
 
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