Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

265 lines
8.6 KiB

//========= Copyright Valve Corporation, All rights reserved. ============//
//
// The copyright to the contents herein is the property of Valve, L.L.C.
// The contents may be used and/or copied only with the written permission of
// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
// the agreement/contract under which the contents have been supplied.
//
// Purpose: Defines a group of app systems that all have the same lifetime
// that need to be connected/initialized, etc. in a well-defined order
//
// $Revision: $
// $NoKeywords: $
//=============================================================================
#ifndef IAPPSYSTEMGROUP_H
#define IAPPSYSTEMGROUP_H
#ifdef _WIN32
#pragma once
#endif
#include "tier1/interface.h"
#include "tier1/utlvector.h"
#include "tier1/utldict.h"
#include "IAppSystem.h"
//-----------------------------------------------------------------------------
// forward declarations
//-----------------------------------------------------------------------------
class IAppSystem;
class CSysModule;
class IBaseInterface;
class IFileSystem;
//-----------------------------------------------------------------------------
// Handle to a DLL
//-----------------------------------------------------------------------------
typedef int AppModule_t;
enum
{
APP_MODULE_INVALID = (AppModule_t)~0
};
//-----------------------------------------------------------------------------
// NOTE: The following methods must be implemented in your application
// although they can be empty implementations if you like...
//-----------------------------------------------------------------------------
abstract_class IAppSystemGroup
{
public:
// An installed application creation function, you should tell the group
// the DLLs and the singleton interfaces you want to instantiate.
// Return false if there's any problems and the app will abort
virtual bool Create( ) = 0;
// Allow the application to do some work after AppSystems are connected but
// they are all Initialized.
// Return false if there's any problems and the app will abort
virtual bool PreInit() = 0;
// Main loop implemented by the application
virtual int Main( ) = 0;
// Allow the application to do some work after all AppSystems are shut down
virtual void PostShutdown() = 0;
// Call an installed application destroy function, occurring after all modules
// are unloaded
virtual void Destroy() = 0;
};
//-----------------------------------------------------------------------------
// Specifies a module + interface name for initialization
//-----------------------------------------------------------------------------
struct AppSystemInfo_t
{
const char *m_pModuleName;
const char *m_pInterfaceName;
};
//-----------------------------------------------------------------------------
// This class represents a group of app systems that all have the same lifetime
// that need to be connected/initialized, etc. in a well-defined order
//-----------------------------------------------------------------------------
class CAppSystemGroup : public IAppSystemGroup
{
public:
// Used to determine where we exited out from the system
enum AppSystemGroupStage_t
{
CREATION = 0,
CONNECTION,
PREINITIALIZATION,
INITIALIZATION,
SHUTDOWN,
POSTSHUTDOWN,
DISCONNECTION,
DESTRUCTION,
NONE, // This means no error
};
public:
// constructor
CAppSystemGroup( CAppSystemGroup *pParentAppSystem = NULL );
// Runs the app system group.
// First, modules are loaded, next they are connected, followed by initialization
// Then Main() is run
// Then modules are shut down, disconnected, and unloaded
int Run( );
// Use this version in cases where you can't control the main loop and
// expect to be ticked
virtual int Startup();
virtual void Shutdown();
// Returns the stage at which the app system group ran into an error
AppSystemGroupStage_t GetErrorStage() const;
protected:
// These methods are meant to be called by derived classes of CAppSystemGroup
// Methods to load + unload DLLs
AppModule_t LoadModule( const char *pDLLName );
AppModule_t LoadModule( CreateInterfaceFn factory );
// Method to add various global singleton systems
IAppSystem *AddSystem( AppModule_t module, const char *pInterfaceName );
void AddSystem( IAppSystem *pAppSystem, const char *pInterfaceName );
// Simpler method of doing the LoadModule/AddSystem thing.
// Make sure the last AppSystemInfo has a NULL module name
bool AddSystems( AppSystemInfo_t *pSystems );
// Method to look up a particular named system...
void *FindSystem( const char *pInterfaceName );
// Gets at a class factory for the topmost appsystem group in an appsystem stack
static CreateInterfaceFn GetFactory();
private:
int OnStartup();
void OnShutdown();
void UnloadAllModules( );
void RemoveAllSystems();
// Method to connect/disconnect all systems
bool ConnectSystems( );
void DisconnectSystems();
// Method to initialize/shutdown all systems
InitReturnVal_t InitSystems();
void ShutdownSystems();
// Gets at the parent appsystem group
CAppSystemGroup *GetParent();
// Loads a module the standard way
virtual CSysModule *LoadModuleDLL( const char *pDLLName );
void ReportStartupFailure( int nErrorStage, int nSysIndex );
struct Module_t
{
CSysModule *m_pModule;
CreateInterfaceFn m_Factory;
char *m_pModuleName;
};
CUtlVector<Module_t> m_Modules;
CUtlVector<IAppSystem*> m_Systems;
CUtlDict<int, unsigned short> m_SystemDict;
CAppSystemGroup *m_pParentAppSystem;
AppSystemGroupStage_t m_nErrorStage;
friend void *AppSystemCreateInterfaceFn(const char *pName, int *pReturnCode);
friend class CSteamAppSystemGroup;
};
//-----------------------------------------------------------------------------
// This class represents a group of app systems that are loaded through steam
//-----------------------------------------------------------------------------
class CSteamAppSystemGroup : public CAppSystemGroup
{
public:
CSteamAppSystemGroup( IFileSystem *pFileSystem = NULL, CAppSystemGroup *pParentAppSystem = NULL );
// Used by CSteamApplication to set up necessary pointers if we can't do it in the constructor
void Setup( IFileSystem *pFileSystem, CAppSystemGroup *pParentAppSystem );
protected:
// Sets up the search paths
bool SetupSearchPaths( const char *pStartingDir, bool bOnlyUseStartingDir, bool bIsTool );
// Returns the game info path. Only works if you've called SetupSearchPaths first
const char *GetGameInfoPath() const;
private:
virtual CSysModule *LoadModuleDLL( const char *pDLLName );
IFileSystem *m_pFileSystem;
char m_pGameInfoPath[ MAX_PATH ];
};
//-----------------------------------------------------------------------------
// Helper empty decorator implementation of an IAppSystemGroup
//-----------------------------------------------------------------------------
template< class CBaseClass >
class CDefaultAppSystemGroup : public CBaseClass
{
public:
virtual bool Create( ) { return true; }
virtual bool PreInit() { return true; }
virtual void PostShutdown() {}
virtual void Destroy() {}
};
//-----------------------------------------------------------------------------
// Special helper for game info directory suggestion
//-----------------------------------------------------------------------------
class CFSSteamSetupInfo; // Forward declaration
//
// SuggestGameInfoDirFn_t
// Game info suggestion function.
// Provided by the application to possibly detect the suggested game info
// directory and initialize all the game-info-related systems appropriately.
// Parameters:
// pFsSteamSetupInfo steam file system setup information if available.
// pchPathBuffer buffer to hold game info directory path on return.
// nBufferLength length of the provided buffer to hold game info directory path.
// pbBubbleDirectories should contain "true" on return to bubble the directories up searching for game info file.
// Return values:
// Returns "true" if the game info directory path suggestion is available and
// was successfully copied into the provided buffer.
// Returns "false" otherwise, interpreted that no suggestion will be used.
//
typedef bool ( * SuggestGameInfoDirFn_t ) ( CFSSteamSetupInfo const *pFsSteamSetupInfo, char *pchPathBuffer, int nBufferLength, bool *pbBubbleDirectories );
//
// SetSuggestGameInfoDirFn
// Installs the supplied game info directory suggestion function.
// Parameters:
// pfnNewFn the new game info directory suggestion function.
// Returns:
// The previously installed suggestion function or NULL if none was installed before.
// This function never fails.
//
SuggestGameInfoDirFn_t SetSuggestGameInfoDirFn( SuggestGameInfoDirFn_t pfnNewFn );
#endif // APPSYSTEMGROUP_H