From 1226f4a56d387bfe7731e5c7e9a47efb67f4bb27 Mon Sep 17 00:00:00 2001
From: ceski <[EMAIL REDACTED]>
Date: Thu, 14 May 2026 16:26:26 -0700
Subject: [PATCH] Add Steam Controller touchpads, capacitive touch for sticks,
and grip sense (#15528)
(cherry picked from commit f3faf67c645023ecb26485781dd26e0948030800)
---
src/joystick/hidapi/SDL_hidapi_steam_triton.c | 81 +++++++++++++------
.../hidapi/steam/controller_structs.h | 8 +-
2 files changed, 62 insertions(+), 27 deletions(-)
diff --git a/src/joystick/hidapi/SDL_hidapi_steam_triton.c b/src/joystick/hidapi/SDL_hidapi_steam_triton.c
index 9d2b026eecb6b..f1c58812291fd 100644
--- a/src/joystick/hidapi/SDL_hidapi_steam_triton.c
+++ b/src/joystick/hidapi/SDL_hidapi_steam_triton.c
@@ -40,11 +40,17 @@
enum
{
- SDL_GAMEPAD_BUTTON_STEAM_DECK_QAM = 11,
- SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_PADDLE1,
- SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_PADDLE1,
- SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_PADDLE2,
- SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_PADDLE2,
+ SDL_GAMEPAD_BUTTON_TRITON_QAM = 11,
+ SDL_GAMEPAD_BUTTON_TRITON_RIGHT_PADDLE1,
+ SDL_GAMEPAD_BUTTON_TRITON_LEFT_PADDLE1,
+ SDL_GAMEPAD_BUTTON_TRITON_RIGHT_PADDLE2,
+ SDL_GAMEPAD_BUTTON_TRITON_LEFT_PADDLE2,
+ SDL_GAMEPAD_BUTTON_TRITON_RIGHT_TOUCHPAD,
+ SDL_GAMEPAD_BUTTON_TRITON_LEFT_TOUCHPAD,
+ SDL_GAMEPAD_BUTTON_TRITON_RIGHT_JOYSTICK_TOUCH,
+ SDL_GAMEPAD_BUTTON_TRITON_LEFT_JOYSTICK_TOUCH,
+ SDL_GAMEPAD_BUTTON_TRITON_RIGHT_GRIP_TOUCH,
+ SDL_GAMEPAD_BUTTON_TRITON_LEFT_GRIP_TOUCH,
SDL_GAMEPAD_NUM_TRITON_BUTTONS,
};
@@ -76,19 +82,18 @@ typedef enum
TRITON_LBUTTON_L5 = 0x00040000,
TRITON_LBUTTON_L = 0x00080000,
- /*
- STEAM_RIGHTSTICK_FINGERDOWN_MASK, // Right Stick Touch 0x00100000
- STEAM_RIGHTPAD_FINGERDOWN_MASK, // Right Pad Touch 0x00200000
- STEAM_BUTTON_RIGHTPAD_CLICKED_MASK, // Right Pressure Click 0x00400000
- STEAM_RIGHT_TRIGGER_MASK, // Right Trigger Click 0x00800000
-
- STEAM_LEFTSTICK_FINGERDOWN_MASK, // Left Stick Touch 0x01000000
- STEAM_LEFTPAD_FINGERDOWN_MASK, // Left Pad Touch 0x02000000
- STEAM_BUTTON_LEFTPAD_CLICKED_MASK, // Left Pressure Click 0x04000000
- STEAM_LEFT_TRIGGER_MASK, // Left Trigger Click 0x08000000
- STEAM_RIGHT_AUX_MASK, // Right Pinky Touch 0x10000000
- STEAM_LEFT_AUX_MASK, // Left Pinky Touch 0x20000000
- */
+ TRITON_RIGHT_JOYSTICK_TOUCH = 0x00100000,
+ TRITON_RIGHT_TOUCHPAD_TOUCH = 0x00200000,
+ TRITON_RIGHT_TOUCHPAD_CLICK = 0x00400000,
+ TRITON_RIGHT_TRIGGER_CLICK = 0x00800000,
+
+ TRITON_LEFT_JOYSTICK_TOUCH = 0x01000000,
+ TRITON_LEFT_TOUCHPAD_TOUCH = 0x02000000,
+ TRITON_LEFT_TOUCHPAD_CLICK = 0x04000000,
+ TRITON_LEFT_TRIGGER_CLICK = 0x08000000,
+
+ TRITON_RIGHT_GRIP_TOUCH = 0x10000000,
+ TRITON_LEFT_GRIP_TOUCH = 0x20000000,
} TritonButtons;
typedef struct
@@ -160,7 +165,7 @@ static void HIDAPI_DriverSteamTriton_HandleState(SDL_HIDAPI_Device *device,
((pTritonReport->buttons & TRITON_LBUTTON_VIEW) != 0));
SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_GUIDE,
((pTritonReport->buttons & TRITON_LBUTTON_STEAM) != 0));
- SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_QAM,
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_QAM,
((pTritonReport->buttons & TRITON_HBUTTON_QAM) != 0));
SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_LEFT_STICK,
@@ -168,15 +173,30 @@ static void HIDAPI_DriverSteamTriton_HandleState(SDL_HIDAPI_Device *device,
SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_RIGHT_STICK,
((pTritonReport->buttons & TRITON_LBUTTON_R3) != 0));
- SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_PADDLE1,
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_RIGHT_PADDLE1,
((pTritonReport->buttons & TRITON_HBUTTON_R4) != 0));
- SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_PADDLE1,
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_LEFT_PADDLE1,
((pTritonReport->buttons & TRITON_HBUTTON_L4) != 0));
- SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_PADDLE2,
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_RIGHT_PADDLE2,
((pTritonReport->buttons & TRITON_LBUTTON_R5) != 0));
- SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_PADDLE2,
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_LEFT_PADDLE2,
((pTritonReport->buttons & TRITON_LBUTTON_L5) != 0));
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_RIGHT_TOUCHPAD,
+ ((pTritonReport->buttons & TRITON_RIGHT_TOUCHPAD_CLICK) != 0));
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_LEFT_TOUCHPAD,
+ ((pTritonReport->buttons & TRITON_LEFT_TOUCHPAD_CLICK) != 0));
+
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_RIGHT_JOYSTICK_TOUCH,
+ ((pTritonReport->buttons & TRITON_RIGHT_JOYSTICK_TOUCH) != 0));
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_LEFT_JOYSTICK_TOUCH,
+ ((pTritonReport->buttons & TRITON_LEFT_JOYSTICK_TOUCH) != 0));
+
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_RIGHT_GRIP_TOUCH,
+ ((pTritonReport->buttons & TRITON_RIGHT_GRIP_TOUCH) != 0));
+ SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_TRITON_LEFT_GRIP_TOUCH,
+ ((pTritonReport->buttons & TRITON_LEFT_GRIP_TOUCH) != 0));
+
if (pTritonReport->buttons & TRITON_LBUTTON_DPAD_UP) {
hat |= SDL_HAT_UP;
}
@@ -226,6 +246,18 @@ static void HIDAPI_DriverSteamTriton_HandleState(SDL_HIDAPI_Device *device,
ctx->last_sensor_tick = pTritonReport->imu.timestamp;
}
+
+ SDL_SendJoystickTouchpad(timestamp, joystick, 0, 0,
+ pTritonReport->sPressureLeft > 0,
+ pTritonReport->sLeftPadX / 65536.0f + 0.5f,
+ -(float)pTritonReport->sLeftPadY / 65536.0f + 0.5f,
+ pTritonReport->sPressureLeft / 32768.0f);
+
+ SDL_SendJoystickTouchpad(timestamp, joystick, 1, 0,
+ pTritonReport->sPressureRight > 0,
+ pTritonReport->sRightPadX / 65536.0f + 0.5f,
+ -(float)pTritonReport->sRightPadY / 65536.0f + 0.5f,
+ pTritonReport->sPressureRight / 32768.0f);
}
static void HIDAPI_DriverSteamTriton_HandleBatteryStatus(SDL_HIDAPI_Device *device,
@@ -445,6 +477,9 @@ static bool HIDAPI_DriverSteamTriton_OpenJoystick(SDL_HIDAPI_Device *device, SDL
SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_GYRO, update_rate_in_hz);
SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_ACCEL, update_rate_in_hz);
+ SDL_PrivateJoystickAddTouchpad(joystick, 1);
+ SDL_PrivateJoystickAddTouchpad(joystick, 1);
+
return true;
}
diff --git a/src/joystick/hidapi/steam/controller_structs.h b/src/joystick/hidapi/steam/controller_structs.h
index e3a979427ff95..365bc73f9b401 100644
--- a/src/joystick/hidapi/steam/controller_structs.h
+++ b/src/joystick/hidapi/steam/controller_structs.h
@@ -607,11 +607,11 @@ typedef struct
short sLeftPadX;
short sLeftPadY;
- unsigned short ucPressureLeft;
+ unsigned short sPressureLeft;
short sRightPadX;
short sRightPadY;
- unsigned short ucPressureRight;
+ unsigned short sPressureRight;
TritonMTUIMU_t imu;
} TritonMTUFull_t;
@@ -628,11 +628,11 @@ typedef struct {
short sLeftPadX;
short sLeftPadY;
- unsigned short ucPressureLeft;
+ unsigned short sPressureLeft;
short sRightPadX;
short sRightPadY;
- unsigned short ucPressureRight;
+ unsigned short sPressureRight;
TritonMTUIMUNoQuat_t imu;
} TritonMTUNoQuat_t;