443 lines
13 KiB
C
443 lines
13 KiB
C
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/*****************************************************************************
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*
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* DIEm.h
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*
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* Copyright (c) 1996-1997 Microsoft Corporation. All Rights Reserved.
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*
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* Abstract:
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*
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* DirectInput internal header file for emulation.
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*
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*****************************************************************************/
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @struct CEd |
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*
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* Emulation descriptor. One of these is created for each
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* device. It is never destroyed, so the variable must
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* be a global variable or memory allocated inside a
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* container that will eventually be destroyed.
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*
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* ISSUE-2001/03/29-timgill Need a better destructor function
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*
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* @field LPVOID const | pState |
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*
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* State buffer that everybody parties into.
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*
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* It too is never destroyed, so once again it should be
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* a global variable or live inside something else that
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* will be destroyed.
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*
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* @field LPDWORD const | pDevType |
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*
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* Array of device type descriptors, indexed by data format
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* offset. Used to determine whether a particular piece of
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* data belongs to an axis, button, or POV.
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*
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* @field EMULATIONPROC | Acquire |
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*
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* Callback function for acquisition and loss thereof.
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* It is called once when the first client acquires,
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* and again when the last app unacquires. It is not
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* informed of nested acquisition.
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*
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* @field LONG | cAcquire |
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*
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* Number of times the device emulation has been acquired (minus one).
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*
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* @field DWORD | cbData |
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*
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* Size of the device data type. In other words, size of
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* <p pState> in bytes.
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*
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*****************************************************************************/
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typedef STDMETHOD(EMULATIONPROC)(struct CEm *, BOOL fAcquire);
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typedef struct CEd {
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LPVOID const pState;
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LPDWORD const pDevType;
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EMULATIONPROC Acquire;
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LONG cAcquire;
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DWORD cbData;
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ULONG cRef;
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} CEd, ED, *PED;
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @struct CEm |
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*
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* Emulation state information.
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*
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* @field VXDINSTANCE | vi |
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*
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* Information shared with parent device.
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*
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* @field PEM | pemNext |
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*
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* Next item in linked list of all active device instances.
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*
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* @field LPDWORD | rgdwDf |
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*
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* Array of items (one for each byte in the device
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* data format). This maps each device data format byte
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* into an application device data offset, or -1 if the
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* application doesn't care about the corresponding object.
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*
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* @field ULONG_PTR | dwExtra |
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*
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* Extra information passed in the <t VXDDEVICEFORMAT>
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* when the device was created. This is used by each
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* particular device to encode additional instance infomation.
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*
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* @field PED | ped |
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*
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* The device that owns this instance. Multiple instances
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* of the same device share the same <e CEm.ped>.
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*
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* @field LONG | cRef |
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*
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* Reference count.
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*
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*
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* @field LONG | cAcquire |
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*
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* Number of times the device instance has been acquired (minus one).
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*
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*
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* @field BOOL | fWorkerThread |
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*
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* This is used by low-level hooks and HID devices, which
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* require a worker thread to collect the data.
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* This is not cheap, so
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* instead, we spin up the thread on the first acquire, and
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* on the unacquire, we keep the thread around so that the next
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* acquire is fast. When the last object is released, we finally
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* kill the thread.
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*
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*****************************************************************************/
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typedef struct CEm {
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VXDINSTANCE vi; /* This must be first */
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struct CEm *pemNext;
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LPDWORD rgdwDf;
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ULONG_PTR dwExtra;
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PED ped;
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LONG cAcquire;
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LONG cRef;
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#ifdef WORKER_THREAD
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BOOL fWorkerThread;
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#endif
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#ifdef DEBUG
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DWORD dwSignature;
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#endif
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BOOL fHidden;
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} CEm, EM, *PEM;
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#define CEM_SIGNATURE 0x4D4D4545 /* "EEMM" */
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @func PEM | pemFromPvi |
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*
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* Given an interior pointer to a <t VXDINSTANCE>, retrieve
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* a pointer to the parent <t CEm>.
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*
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* @parm PVXDINSTANCE | pvi |
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*
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* The pointer to convert.
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*
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*****************************************************************************/
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PEM INLINE
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pemFromPvi(PVXDINSTANCE pvi)
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{
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return pvSubPvCb(pvi, FIELD_OFFSET(CEm, vi));
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}
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/*****************************************************************************
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*
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* NT low-level hook support
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*
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* Low-level hooks live on a separate thread which we spin
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* up when first requested and take down when the last
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* DirectInput device that used a thread has been destroyed.
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*
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* If we wanted, we could destroy the thread when the
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* device is unacquired (rather than when the device is
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* destroyed), but we cache the thread instead, because
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* a device that once has been acquired will probably be
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* acquired again.
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*
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* To prevent race conditions from crashing us, we addref
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* our DLL when the thread exists and have the thread
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* perform a FreeLibrary as its final act.
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*
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* Note that this helper thread is also used by the HID data
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* collector.
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*
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*****************************************************************************/
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#ifdef USE_SLOW_LL_HOOKS
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @struct LLHOOKSTATE |
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*
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* Low-level hook information about a single hook.
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*
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* @field int | cHook |
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*
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* Number of times the hook has been requested. If zero,
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* then there should be no hook. All modifications to
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* this field must be interlocked to avoid race conditions
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* when two threads try to hook or unhook simultaneously.
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*
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* @field int | cExcl |
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*
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* Number of times the hook has been requested in an exclusive
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* mode. This value should always be less than or equal to the
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* cHook value. All modifications to this field must be
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* interlocked to avoid race conditions when two threads try to
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* hook or unhook simultaneously.
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*
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* @field HHOOK | hhk |
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*
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* The actual hook, if it is installed. Only the hook thread
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* touches this field, so it does not need to be protected.
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*
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* @field BOOLEAN | fExcluded |
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*
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* Flag to indicate whether or not exclusivity has been applied.
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* Only the hook thread touches this field, so it does not need to
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* be protected.
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*
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*****************************************************************************/
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typedef struct LLHOOKSTATE {
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int cHook;
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int cExcl;
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HHOOK hhk;
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BOOLEAN fExcluded;
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} LLHOOKSTATE, *PLLHOOKSTATE;
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LRESULT CALLBACK CEm_LL_KbdHook(int nCode, WPARAM wp, LPARAM lp);
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LRESULT CALLBACK CEm_LL_MseHook(int nCode, WPARAM wp, LPARAM lp);
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#endif /* USE_SLOW_LL_HOOKS */
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#ifdef WORKER_THREAD
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @struct LLTHREADSTATE |
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*
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* Low-level hook state for a thread. Note that this is
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* a dynamically
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* allocated structure instead of a static. This avoids various
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* race conditions where, for example, somebody terminates the
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* worker thread and somebody else starts it up before the
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* worker thread is completely gone.
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*
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* A pointer to the hThread is passed as the pointer to an array
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* of two handles in calls to WaitForMultipleObject so hEvent must
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* follow it directly.
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*
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* @field DWORD | idThread |
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*
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* The ID of the worker thread.
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*
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* @field LONG | cRef |
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*
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* Thread reference count. The thread kills itself when this
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* drops to zero.
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*
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* @field LLHOOKSTATE | rglhs[2] |
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*
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* Hook states, indexed by LLTS_* values.
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*
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* These are used only if low-level hooks are enabled.
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*
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* @field HANDLE | hThread |
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*
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* The handle (from the create) of the worker thread.
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*
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* This is used only if HID support is enabled.
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*
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* @field HANDLE | hEvent |
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*
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* The handle to the event used to synchronize with the worker thread.
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*
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* This is used only if HID support is enabled.
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*
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* @field GPA | gpaHid |
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*
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* Pointer array of HID devices which are acquired.
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*
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* This is used only if HID support is enabled.
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*
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* @field PEM | pemCheck |
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*
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* Pointer to Emulation state information.
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*
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* This is used only if HID support is enabled.
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*
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*****************************************************************************/
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#define LLTS_KBD 0
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#define LLTS_MSE 1
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#define LLTS_MAX 2
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typedef struct LLTHREADSTATE {
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DWORD idThread;
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LONG cRef;
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#ifdef USE_SLOW_LL_HOOKS
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LLHOOKSTATE rglhs[LLTS_MAX];
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#endif
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#ifdef HID_SUPPORT
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HANDLE hThread; /* MUST be followed by hEvent, see above */
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HANDLE hEvent; /* MUST follow hThread, see above */
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GPA gpaHid;
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PEM pemCheck;
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#endif
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} LLTHREADSTATE, *PLLTHREADSTATE;
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @topic Communicating with the worker thread |
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*
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* Communication with the worker thread is performed via
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* <c WM_NULL> messages. Extra care must be taken to make
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* sure that someone isn't randomly sending messages to us.
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*
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* We use the <c WM_NULL> message because there are race
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* windows where we might post a message to a thread after
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* it is gone. During this window, the thread ID might get
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* recycled, and we end up posting the message to some random
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* thread that isn't ours. By using the <c WM_NULL> message,
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* we are safe in knowing that the target thread won't barf
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* on the unexpected message.
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*
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* The <t WPARAM> of the <c WM_NULL> is the magic value
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* <c WT_WPARAM>.
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*
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* The <t LPARAM> of the <c WM_NULL> is either a pointer
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* to the <t CEm> that needs to be refreshed or is
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* zero if we merely want to check our bearings.
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*
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*****************************************************************************/
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#define WT_WPARAM 0
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#define PostWorkerMessage(thid, lp) \
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PostThreadMessage(thid, WM_NULL, WT_WPARAM, (LPARAM)(lp)) \
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#define NudgeWorkerThread(thid) \
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PostThreadMessage(thid, WM_NULL, WT_WPARAM, (LPARAM)NULL)
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HRESULT EXTERNAL NudgeWorkerThreadPem( PLLTHREADSTATE plts, PEM pem );
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HRESULT EXTERNAL NotifyWorkerThreadPem(DWORD idThread, PEM pem);
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STDMETHODIMP CEm_GetWorkerThread(PEM pem, PLLTHREADSTATE *pplts);
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @global PLLTHREADSTATE | g_plts |
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*
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* The thread state of the currently-active thread.
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*
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* This variable needs to be externally accessible
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* because you can't pass instance data to a windows
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* hook function. (Whose idea was that?)
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*
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*****************************************************************************/
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extern PLLTHREADSTATE g_plts;
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void EXTERNAL CEm_Mouse_OnMouseChange(void);
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#endif /* WORKER_THREAD */
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/*
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* Private helper functions in diem.c
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*/
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#define FDUFL_NORMAL 0x0000 /* Nothing unusual */
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#define FDUFL_UNPLUGGED VIFL_UNPLUGGED /* Device disconnected */
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void EXTERNAL CEm_ForceDeviceUnacquire(PED ped, UINT fdufl);
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void EXTERNAL CEm_AddState(PED ped, LPVOID pvData, DWORD tm);
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DWORD EXTERNAL CEm_AddEvent(PED ped, DWORD dwData, DWORD dwOfs, DWORD tm);
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BOOL EXTERNAL CEm_ContinueEvent(PED ped, DWORD dwData, DWORD dwOfs, DWORD tm, DWORD dwSeq);
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STDMETHODIMP CEm_LL_Acquire(PEM this, BOOL fAcquire, ULONG fl, UINT ilts);
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HRESULT EXTERNAL
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CEm_CreateInstance(PVXDDEVICEFORMAT pdevf, PVXDINSTANCE *ppviOut, PED ped);
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void EXTERNAL CEm_FreeInstance(PEM this);
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @func void | CEm_AddRef |
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*
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* Bump the reference count because we're doing something with it.
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*
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* @parm PEM | this |
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*
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* The victim.
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*
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*****************************************************************************/
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void INLINE
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CEm_AddRef(PEM this)
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{
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AssertF(this->dwSignature == CEM_SIGNATURE);
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InterlockedIncrement(&this->cRef);
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}
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/*****************************************************************************
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*
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* @doc INTERNAL
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*
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* @func void | CEm_Release |
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*
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* Drop the reference count and blow it away if it's gone.
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*
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* @parm PEM | this |
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*
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* The victim.
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*
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*****************************************************************************/
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void INLINE
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CEm_Release(PEM this)
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{
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AssertF(this->dwSignature == CEM_SIGNATURE);
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if (InterlockedDecrement(&this->cRef) == 0) {
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CEm_FreeInstance(this);
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}
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}
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