Add data exchange through a global shared state block

This commits allows to share prviously unshared data without overloading too much the API by adding a single data block for pulsed state, device state, modulated segments, multiple DMDs, raw DMD frames (for correct rendering and allow coloring) and video.

This commit contains the skeleton and base implementation to set up the ground for more testing on client side  (VPX) when support will be more advanced there. It also gives a ground to implement in LibPinMame.

src/win32com/Controller.cpp

@@ -1733,6 +1733,36 @@ STDMETHODIMP CController::put_TimeFence(double timeInS)
 	return S_OK;
 }
 
+/****************************************************************************
+ * IController.get_StateBlock: returns a shared memory block name which holds
+ * a global state block prepended by the memory block size as an unsigned int
+ ****************************************************************************/
+STDMETHODIMP CController::get_StateBlock(/*[out, retval]*/ BSTR* pVal)
+{
+	if (!pVal)
+		return E_POINTER;
+	if (!Machine)
+		return E_FAIL;
+	if (core_getOutputState(CORE_STATE_REQMASK_ALL) == NULL)
+		return E_FAIL;
+	CComBSTR bsStateSharedMemName(TEXT("Local\\VPinMameStateBlock"));
+	*pVal = bsStateSharedMemName.Detach();
+	return S_OK;
+}
+
+/****************************************************************************
+ * IController.UpdateStateBlock: Update requested outputs of the global state
+ * block
+ ****************************************************************************/
+STDMETHODIMP CController::UpdateStateBlock(/*[in, defaultvalue(0x1F)]*/ unsigned int updateMask)
+{
+	if (!Machine)
+		return E_FAIL;
+	if (core_getOutputState(updateMask) == NULL)
+		return E_FAIL;
+	return S_OK;
+}
+
 /****************************************************************************
  * IController.Version (read-only): gets the program version of VPM
  ****************************************************************************/

src/win32com/Controller.h

@@ -205,6 +205,9 @@ DECLARE_PROTECT_FINAL_CONSTRUCT()
 	STDMETHOD(put_ModOutputType)(/*[in]*/ int output, /*[in]*/ int no, /*[in]*/ int newVal);
 
 	STDMETHOD(put_TimeFence)(/*[in]*/ double fenceIns);
+
+	STDMETHOD(get_StateBlock)(/*[out, retval]*/ BSTR* pVal);
+	STDMETHOD(UpdateStateBlock)(/*[in, defaultvalue(0x1F)]*/ unsigned int updateMask);
 };
 
 #endif // !defined(AFX_Controller_H__D2811491_40D6_4656_9AA7_8FF85FD63543__INCLUDED_)

src/win32com/VPinMAME.idl

@@ -259,6 +259,8 @@ import "ocidl.idl";
 		[propget, id(88), helpstring("property ModOutputType")] HRESULT ModOutputType([in] int output, [in] int no, [out, retval] int *pVal);
 		[propput, id(88), helpstring("property ModOutputType")] HRESULT ModOutputType([in] int output, [in] int no, [in] int newVal);
 		[propput, id(89), helpstring("property TimeFence")] HRESULT TimeFence([in] double timeInS);
+		[propget, id(90), helpstring("property StateBlock")] HRESULT StateBlock([out, retval] BSTR* pVal);
+		[id(91), helpstring("method UpdateStateBlock")] HRESULT UpdateStateBlock([in, defaultvalue(0x1F)] unsigned int updateMask);
 	};
 
 	// WSHDlg and related interfaces