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Made HIDAPI device change notifications available via SDL_hid_device_change_count()

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This commit is contained in:
Sam Lantinga
2021-11-11 12:45:38 -08:00
parent 77a1ad1c61
commit c9ada1c142
5 changed files with 547 additions and 473 deletions
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29
include/SDL_hidapi.h
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@@ -122,9 +122,13 @@ typedef struct SDL_hid_device_info
* be called at the beginning of execution however, if there is a chance of
* HIDAPI handles being opened by different threads simultaneously.
*
* Each call to this function should have a matching call to SDL_hid_exit()
*
* \returns 0 on success and -1 on error.
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_hid_exit
*/
extern DECLSPEC int SDLCALL SDL_hid_init(void);
@@ -137,9 +141,32 @@ extern DECLSPEC int SDLCALL SDL_hid_init(void);
* \returns 0 on success and -1 on error.
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_hid_init
*/
extern DECLSPEC int SDLCALL SDL_hid_exit(void);
/**
* Check to see if devices may have been added or removed.
*
* Enumerating the HID devices is an expensive operation, so you can call this
* to see if there have been any system device changes since the last call to
* this function. A change in the counter returned doesn't necessarily mean
* that anything has changed, but you can call SDL_hid_enumerate() to get an
* updated device list.
*
* Calling this function for the first time may cause a thread or other
* system resource to be allocated to track device change notifications.
*
* \returns a change counter that is incremented with each potential device
* change, or 0 if device change detection isn't available.
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_hid_enumerate
*/
extern DECLSPEC Uint32 SDLCALL SDL_hid_device_change_count(void);
/**
* Enumerate the HID Devices.
*
@@ -157,6 +184,8 @@ extern DECLSPEC int SDLCALL SDL_hid_exit(void);
* SDL_hid_free_enumeration().
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_hid_device_change_count
*/
extern DECLSPEC SDL_hid_device_info * SDLCALL SDL_hid_enumerate(unsigned short vendor_id, unsigned short product_id);