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Fix touchpad finger detection on Steam Deck

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Kuratius
2026-05-19 15:34:02 +02:00
committed by Sam Lantinga
parent 48fe7b7d6a
commit 6ed1de089c
1 changed files with 35 additions and 10 deletions
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45
src/joystick/hidapi/SDL_hidapi_steamdeck.c
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@@ -65,6 +65,8 @@ typedef enum
STEAMDECK_LBUTTON_R5 = 0x00010000,
STEAMDECK_LBUTTON_LEFT_PAD = 0x00020000,
STEAMDECK_LBUTTON_RIGHT_PAD = 0x00040000,
STEAMDECK_LBUTTON_LEFT_TOUCHPAD_TOUCH = 0x00080000,
STEAMDECK_LBUTTON_RIGHT_TOUCHPAD_TOUCH = 0x00100000,
STEAMDECK_LBUTTON_L3 = 0x00400000,
STEAMDECK_LBUTTON_R3 = 0x04000000,
@@ -81,6 +83,13 @@ typedef struct
Uint64 sensor_timestamp_ns;
Uint64 last_button_state;
Uint8 watchdog_counter;
bool left_touch_down;
float left_touch_x;
float left_touch_y;
bool right_touch_down;
float right_touch_x;
float right_touch_y;
} SDL_DriverSteamDeck_Context;
static bool DisableDeckLizardMode(SDL_hid_device *dev)
@@ -248,17 +257,33 @@ static void HIDAPI_DriverSteamDeck_HandleState(SDL_HIDAPI_Device *device,
values[2] = (-pInReport->payload.deckState.sAccelY / 32768.0f) * 2.0f * SDL_STANDARD_GRAVITY;
SDL_SendJoystickSensor(timestamp, joystick, SDL_SENSOR_ACCEL, ctx->sensor_timestamp_ns, values, 3);
SDL_SendJoystickTouchpad(timestamp, joystick, 0, 0,
pInReport->payload.deckState.sPressurePadLeft > 0,
pInReport->payload.deckState.sLeftPadX / 65536.0f + 0.5f,
pInReport->payload.deckState.sLeftPadY / 65536.0f + 0.5f,
pInReport->payload.deckState.sPressurePadLeft / 32768.0f);
bool left_touch_down = (pInReport->payload.deckState.ulButtonsL & STEAMDECK_LBUTTON_LEFT_TOUCHPAD_TOUCH) ? true : false;
bool right_touch_down = (pInReport->payload.deckState.ulButtonsL & STEAMDECK_LBUTTON_RIGHT_TOUCHPAD_TOUCH) ? true : false;
if (left_touch_down || ctx->left_touch_down) {
if (left_touch_down) {
ctx->left_touch_x = pInReport->payload.deckState.sLeftPadX / 65536.0f + 0.5f;
ctx->left_touch_y = -(float)pInReport->payload.deckState.sLeftPadY / 65536.0f + 0.5f;
SDL_SendJoystickTouchpad(timestamp, joystick, 1, 0,
pInReport->payload.deckState.sPressurePadRight > 0,
pInReport->payload.deckState.sRightPadX / 65536.0f + 0.5f,
pInReport->payload.deckState.sRightPadY / 65536.0f + 0.5f,
pInReport->payload.deckState.sPressurePadRight / 32768.0f);
}
SDL_SendJoystickTouchpad(timestamp, joystick, 0, 0,
left_touch_down,
ctx->left_touch_x,
ctx->left_touch_y,
pInReport->payload.deckState.sPressurePadLeft / 32768.0f);
ctx->left_touch_down = left_touch_down;
}
if (right_touch_down || ctx->right_touch_down) {
if (right_touch_down) {
ctx->right_touch_x = pInReport->payload.deckState.sRightPadX / 65536.0f + 0.5f;
ctx->right_touch_y = -(float)pInReport->payload.deckState.sRightPadY / 65536.0f + 0.5f;
}
SDL_SendJoystickTouchpad(timestamp, joystick, 1, 0,
right_touch_down,
ctx->right_touch_x,
ctx->right_touch_y,
pInReport->payload.deckState.sPressurePadRight / 32768.0f);
ctx->right_touch_down = right_touch_down;
}
}
/*****************************************************************************************************/