mirror of https://github.com/libsdl-org/SDL
Drain HIDAPI buffer in SDL_hidapi_steamdeck.c.
Add a loop around SDL_hid_read() in the Steam Deck HIDAPI driver as it is done in other HIDAPI drivers. This loop reads data from the device and processes it until the input buffer is empty which ensures that clients always get the latest data. This fixes an input latency issue if the application polls the events slower than the hardware generates them.
This commit is contained in:
Max Maisel
Sam Lantinga
parent
c7ed78a9ef
commit
607b1f225c
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@ -143,117 +143,12 @@ static SDL_bool FeedDeckLizardWatchdog(SDL_hid_device *dev)
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return SDL_TRUE;
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}
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/*****************************************************************************************************/
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static void HIDAPI_DriverSteamDeck_RegisterHints(SDL_HintCallback callback, void *userdata)
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static void HIDAPI_DriverSteamDeck_HandleState(SDL_HIDAPI_Device *device,
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SDL_Joystick *joystick,
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ValveInReport_t *pInReport)
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{
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SDL_AddHintCallback(SDL_HINT_JOYSTICK_HIDAPI_STEAMDECK, callback, userdata);
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}
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static void HIDAPI_DriverSteamDeck_UnregisterHints(SDL_HintCallback callback, void *userdata)
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{
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SDL_DelHintCallback(SDL_HINT_JOYSTICK_HIDAPI_STEAMDECK, callback, userdata);
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}
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static SDL_bool HIDAPI_DriverSteamDeck_IsEnabled(void)
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{
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return SDL_GetHintBoolean(SDL_HINT_JOYSTICK_HIDAPI_STEAMDECK,
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SDL_GetHintBoolean(SDL_HINT_JOYSTICK_HIDAPI, SDL_HIDAPI_DEFAULT));
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}
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static SDL_bool HIDAPI_DriverSteamDeck_IsSupportedDevice(
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SDL_HIDAPI_Device *device,
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const char *name,
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SDL_GamepadType type,
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Uint16 vendor_id,
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Uint16 product_id,
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Uint16 version,
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int interface_number,
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int interface_class,
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int interface_subclass,
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int interface_protocol)
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{
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return SDL_IsJoystickSteamDeck(vendor_id, product_id);
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}
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static SDL_bool HIDAPI_DriverSteamDeck_InitDevice(SDL_HIDAPI_Device *device)
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{
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int size;
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Uint8 data[64];
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SDL_DriverSteamDeck_Context *ctx;
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ctx = (SDL_DriverSteamDeck_Context *)SDL_calloc(1, sizeof(*ctx));
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if (ctx == NULL) {
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return SDL_FALSE;
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}
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// Always 1kHz according to USB descriptor
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ctx->update_rate_us = 1000;
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device->context = ctx;
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// Read a report to see if this is the correct endpoint.
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// Mouse, Keyboard and Controller have the same VID/PID but
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// only the controller hidraw device receives hid reports.
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size = SDL_hid_read_timeout(device->dev, data, sizeof(data), 16);
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if (size == 0)
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return SDL_FALSE;
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if (!DisableDeckLizardMode(device->dev))
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return SDL_FALSE;
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HIDAPI_SetDeviceName(device, "Steam Deck");
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return HIDAPI_JoystickConnected(device, NULL);
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}
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static int HIDAPI_DriverSteamDeck_GetDevicePlayerIndex(SDL_HIDAPI_Device *device, SDL_JoystickID instance_id)
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{
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return -1;
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}
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static void HIDAPI_DriverSteamDeck_SetDevicePlayerIndex(SDL_HIDAPI_Device *device, SDL_JoystickID instance_id, int player_index)
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{
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}
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static SDL_bool HIDAPI_DriverSteamDeck_UpdateDevice(SDL_HIDAPI_Device *device)
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{
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SDL_DriverSteamDeck_Context *ctx = (SDL_DriverSteamDeck_Context *)device->context;
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SDL_Joystick *joystick = NULL;
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int r;
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uint8_t data[64];
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float values[3];
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ValveInReport_t *pInReport = (ValveInReport_t *)data;
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if (device->num_joysticks > 0) {
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joystick = SDL_GetJoystickFromInstanceID(device->joysticks[0]);
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if (joystick == NULL) {
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return SDL_FALSE;
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}
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} else {
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return SDL_FALSE;
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}
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if (ctx->watchdog_counter++ > 200) {
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ctx->watchdog_counter = 0;
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if (!FeedDeckLizardWatchdog(device->dev))
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return SDL_FALSE;
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}
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SDL_memset(data, 0, sizeof(data));
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r = SDL_hid_read(device->dev, data, sizeof(data));
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if (r == 0) {
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return SDL_FALSE;
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} else if (r <= 0) {
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/* Failed to read from controller */
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HIDAPI_JoystickDisconnected(device, device->joysticks[0]);
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return SDL_FALSE;
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}
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if (!(r == 64 && pInReport->header.unReportVersion == k_ValveInReportMsgVersion && pInReport->header.ucType == ID_CONTROLLER_DECK_STATE && pInReport->header.ucLength == 64)) {
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return SDL_FALSE;
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}
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SDL_DriverSteamDeck_Context *ctx = (SDL_DriverSteamDeck_Context *)device->context;
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Uint64 timestamp = SDL_GetTicksNS();
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if (pInReport->payload.deckState.ulButtons != ctx->last_button_state) {
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@ -338,6 +233,120 @@ static SDL_bool HIDAPI_DriverSteamDeck_UpdateDevice(SDL_HIDAPI_Device *device)
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values[1] = (pInReport->payload.deckState.sAccelZ / 32768.0f) * 2.0f * SDL_STANDARD_GRAVITY;
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values[2] = (-pInReport->payload.deckState.sAccelY / 32768.0f) * 2.0f * SDL_STANDARD_GRAVITY;
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SDL_SendJoystickSensor(timestamp, joystick, SDL_SENSOR_ACCEL, ctx->sensor_timestamp_us, values, 3);
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}
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/*****************************************************************************************************/
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static void HIDAPI_DriverSteamDeck_RegisterHints(SDL_HintCallback callback, void *userdata)
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{
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SDL_AddHintCallback(SDL_HINT_JOYSTICK_HIDAPI_STEAMDECK, callback, userdata);
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}
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static void HIDAPI_DriverSteamDeck_UnregisterHints(SDL_HintCallback callback, void *userdata)
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{
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SDL_DelHintCallback(SDL_HINT_JOYSTICK_HIDAPI_STEAMDECK, callback, userdata);
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}
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static SDL_bool HIDAPI_DriverSteamDeck_IsEnabled(void)
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{
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return SDL_GetHintBoolean(SDL_HINT_JOYSTICK_HIDAPI_STEAMDECK,
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SDL_GetHintBoolean(SDL_HINT_JOYSTICK_HIDAPI, SDL_HIDAPI_DEFAULT));
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}
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static SDL_bool HIDAPI_DriverSteamDeck_IsSupportedDevice(
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SDL_HIDAPI_Device *device,
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const char *name,
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SDL_GamepadType type,
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Uint16 vendor_id,
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Uint16 product_id,
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Uint16 version,
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int interface_number,
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int interface_class,
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int interface_subclass,
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int interface_protocol)
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{
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return SDL_IsJoystickSteamDeck(vendor_id, product_id);
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}
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static SDL_bool HIDAPI_DriverSteamDeck_InitDevice(SDL_HIDAPI_Device *device)
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{
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int size;
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Uint8 data[64];
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SDL_DriverSteamDeck_Context *ctx;
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ctx = (SDL_DriverSteamDeck_Context *)SDL_calloc(1, sizeof(*ctx));
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if (ctx == NULL) {
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return SDL_FALSE;
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}
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// Always 1kHz according to USB descriptor, but actually about 4 ms.
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ctx->update_rate_us = 4000;
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device->context = ctx;
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// Read a report to see if this is the correct endpoint.
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// Mouse, Keyboard and Controller have the same VID/PID but
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// only the controller hidraw device receives hid reports.
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size = SDL_hid_read_timeout(device->dev, data, sizeof(data), 16);
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if (size == 0)
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return SDL_FALSE;
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if (!DisableDeckLizardMode(device->dev))
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return SDL_FALSE;
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HIDAPI_SetDeviceName(device, "Steam Deck");
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return HIDAPI_JoystickConnected(device, NULL);
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}
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static int HIDAPI_DriverSteamDeck_GetDevicePlayerIndex(SDL_HIDAPI_Device *device, SDL_JoystickID instance_id)
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{
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return -1;
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}
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static void HIDAPI_DriverSteamDeck_SetDevicePlayerIndex(SDL_HIDAPI_Device *device, SDL_JoystickID instance_id, int player_index)
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{
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}
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static SDL_bool HIDAPI_DriverSteamDeck_UpdateDevice(SDL_HIDAPI_Device *device)
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{
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SDL_DriverSteamDeck_Context *ctx = (SDL_DriverSteamDeck_Context *)device->context;
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SDL_Joystick *joystick = NULL;
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int r;
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uint8_t data[64];
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ValveInReport_t *pInReport = (ValveInReport_t *)data;
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if (device->num_joysticks > 0) {
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joystick = SDL_GetJoystickFromInstanceID(device->joysticks[0]);
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if (joystick == NULL) {
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return SDL_FALSE;
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}
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} else {
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return SDL_FALSE;
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}
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if (ctx->watchdog_counter++ > 200) {
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ctx->watchdog_counter = 0;
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if (!FeedDeckLizardWatchdog(device->dev))
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return SDL_FALSE;
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}
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SDL_memset(data, 0, sizeof(data));
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do {
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r = SDL_hid_read(device->dev, data, sizeof(data));
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if (r < 0) {
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/* Failed to read from controller */
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HIDAPI_JoystickDisconnected(device, device->joysticks[0]);
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return SDL_FALSE;
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} else if (r == 64 &&
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pInReport->header.unReportVersion == k_ValveInReportMsgVersion &&
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pInReport->header.ucType == ID_CONTROLLER_DECK_STATE &&
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pInReport->header.ucLength == 64) {
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HIDAPI_DriverSteamDeck_HandleState(device, joystick, pInReport);
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}
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} while (r > 0);
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return SDL_TRUE;
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}
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