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common/dx_proxy/dx_proxy.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Make dynamic loading of dx_proxy.dll and methods acquisition easier.
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+
+#ifndef DX_PROXY_H
+#define DX_PROXY_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+/*
+
+class DxProxyModule
+
+Uses a lazy-load technique to load the dx_proxy.dll module and acquire the
+function pointers.
+
+The dx_proxy.dll module is automatically unloaded during desctruction.
+
+*/
+class DxProxyModule
+{
+public:
+	/// Construction
+	DxProxyModule( void );
+	/// Destruction
+	~DxProxyModule( void );
+
+private: // Prevent copying via copy constructor or assignment
+	DxProxyModule( const DxProxyModule & );
+	DxProxyModule & operator = ( const DxProxyModule & );
+
+public:
+	/// Loads the module and acquires function pointers, returns if the module was
+	/// loaded successfully.
+	/// If the module was already loaded the call has no effect and returns TRUE.
+	BOOL Load( void );
+	/// Frees the loaded module.
+	void Free( void );
+
+private:
+	enum Func {
+		fnD3DXCompileShaderFromFile = 0,
+		fnTotal
+	};
+	HMODULE m_hModule;				//!< The handle of the loaded dx_proxy.dll
+	FARPROC m_arrFuncs[fnTotal];	//!< The array of loaded function pointers
+
+
+	///
+	/// Interface functions calling into DirectX proxy
+	///
+public:
+	HRESULT D3DXCompileShaderFromFile(
+		LPCSTR                          pSrcFile,
+		CONST D3DXMACRO*                pDefines,
+		LPD3DXINCLUDE                   pInclude,
+		LPCSTR                          pFunctionName,
+		LPCSTR                          pProfile,
+		DWORD                           Flags,
+		LPD3DXBUFFER*                   ppShader,
+		LPD3DXBUFFER*                   ppErrorMsgs,
+		LPD3DXCONSTANTTABLE*            ppConstantTable );
+};
+
+
+
+
+
+
+
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+//
+//     IMPLEMENTATION
+//
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+
+
+inline DxProxyModule::DxProxyModule( void )
+{
+	m_hModule = NULL;
+	ZeroMemory( m_arrFuncs, sizeof( m_arrFuncs ) );
+}
+
+inline DxProxyModule::~DxProxyModule( void )
+{
+	Free();
+}
+
+inline BOOL DxProxyModule::Load( void )
+{
+	if ( (m_hModule == NULL) &&
+		( m_hModule = ::LoadLibrary( "dx_proxy.dll" ) ) != NULL )
+	{
+		// Requested function names array
+		LPCSTR const arrFuncNames[fnTotal] = {
+			"Proxy_D3DXCompileShaderFromFile"
+		};
+
+		// Acquire the functions
+		for ( int k = 0; k < fnTotal; ++ k )
+		{
+			m_arrFuncs[k] = ::GetProcAddress( m_hModule, arrFuncNames[k] );
+		}
+	}
+
+	return !!m_hModule;
+}
+
+inline void DxProxyModule::Free( void )
+{
+	if ( m_hModule )
+	{
+		::FreeLibrary( m_hModule );
+		m_hModule = NULL;
+		ZeroMemory( m_arrFuncs, sizeof( m_arrFuncs ) );
+	}
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+//
+//     INTERFACE FUNCTIONS IMPLEMENTATION
+//
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+
+
+
+inline HRESULT DxProxyModule::D3DXCompileShaderFromFile(
+								  LPCSTR                          pSrcFile,
+								  CONST D3DXMACRO*                pDefines,
+								  LPD3DXINCLUDE                   pInclude,
+								  LPCSTR                          pFunctionName,
+								  LPCSTR                          pProfile,
+								  DWORD                           Flags,
+								  LPD3DXBUFFER*                   ppShader,
+								  LPD3DXBUFFER*                   ppErrorMsgs,
+								  LPD3DXCONSTANTTABLE*            ppConstantTable )
+{
+	if ( !Load() )
+		return MAKE_HRESULT( SEVERITY_ERROR, FACILITY_ITF, 1 );
+	if ( !m_arrFuncs[fnD3DXCompileShaderFromFile] )
+		return MAKE_HRESULT( SEVERITY_ERROR, FACILITY_ITF, 2 );
+
+	return
+		( *
+			( HRESULT (WINAPI *)
+				( LPCSTR, CONST D3DXMACRO*, LPD3DXINCLUDE,
+				  LPCSTR, LPCSTR, DWORD, LPD3DXBUFFER*,
+				  LPD3DXBUFFER*, LPD3DXCONSTANTTABLE* )
+			)
+			m_arrFuncs[fnD3DXCompileShaderFromFile]
+		)
+		( pSrcFile, pDefines, pInclude, pFunctionName, pProfile, Flags, ppShader, ppErrorMsgs, ppConstantTable );
+}
+
+
+#endif // #ifndef DX_PROXY_H