Initial commit: ROW Client source code

Game client codebase including:
- CharacterActionControl: Character and creature management
- GlobalScript: Network, items, skills, quests, utilities
- RYLClient: Main client application with GUI and event handlers
- Engine: 3D rendering engine (RYLGL)
- MemoryManager: Custom memory allocation
- Library: Third-party dependencies (DirectX, boost, etc.)
- Tools: Development utilities

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Library/dxx8/samples/Multimedia/DirectMusic/MusicTool/echotool.h

@@ -0,0 +1,49 @@
+//-----------------------------------------------------------------------------
+// File: EchoTool.h
+//
+// Desc: Implements an object based on IDirectMusicTool
+//       that provides echoing effects.
+//
+// Copyright (c) 1998-2001 Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#ifndef _ECHOTOOL_H
+#define _ECHOTOOL_H
+
+#include <dmusici.h>
+
+// Maximum echoes is 4 (the number of extra groups opened
+// on the port in helper.cpp)
+#define MAX_ECHOES	4
+
+class CEchoTool : public IDirectMusicTool
+{
+public:
+	CEchoTool();
+    ~CEchoTool();
+
+public:
+// IUnknown
+    virtual STDMETHODIMP QueryInterface(const IID &iid, void **ppv);
+    virtual STDMETHODIMP_(ULONG) AddRef();
+    virtual STDMETHODIMP_(ULONG) Release();
+
+// IDirectMusicTool
+	HRESULT STDMETHODCALLTYPE Init( IDirectMusicGraph* pGraph );
+	HRESULT STDMETHODCALLTYPE GetMsgDeliveryType( DWORD* pdwDeliveryType );
+	HRESULT STDMETHODCALLTYPE GetMediaTypeArraySize( DWORD* pdwNumElements );
+	HRESULT STDMETHODCALLTYPE GetMediaTypes( DWORD** padwMediaTypes, DWORD dwNumElements) ;
+	HRESULT STDMETHODCALLTYPE ProcessPMsg( IDirectMusicPerformance* pPerf, DMUS_PMSG* pDMUS_PMSG );
+	HRESULT STDMETHODCALLTYPE Flush( IDirectMusicPerformance* pPerf, DMUS_PMSG* pDMUS_PMSG, REFERENCE_TIME rt );
+private:
+	long	m_cRef;			    // Reference counter
+	DWORD	m_dwEchoNum;	    // Number of echoes to generate
+	MUSIC_TIME	m_mtDelay;	    // Delay time between echoes
+	CRITICAL_SECTION m_CrSec;	// To make SetEchoNum() and SetDelay() thread-safe
+
+public:
+// Public class methods
+	void	SetEchoNum( DWORD dwEchoNum );
+	void	SetDelay( MUSIC_TIME mtDelay );
+};
+
+#endif // _ECHOTOOL_H