Por
Dekuwa
El DualShock 4 de Sony PlayStation, el DualSense, los Joy-Cons de Nintendo Switch (usados por parejas) y el mando Pro de Nintendo Switch tienen mucho en común. Tienen muchas de las características que se esperan de los mandos de juego modernos. También tienen una entrada increíblemente versátil e infrautilizada que su mayor rival (el mando de la Xbox One de Microsoft) no tiene: el giroscopio.
El objetivo con JoyShockLibrary es permitir a los desarrolladores de juegos soportar DS4, DS, Joy-Cons, y Pro Controllers de forma nativa en los juegos de PC. He compilado la biblioteca para Windows, pero utiliza herramientas agnósticas, y espero que otros desarrolladores puedan hacerla funcionar en otras plataformas (como Linux o Mac) sin demasiados problemas.
Reference
JoyShockLibrary.h has everything you need to use the library, but here's a breakdown of everything in there.
Structs
struct JOY_SHOCK_STATE - This struct contains the state for all the sticks, buttons, and triggers on the controller. If you're just using JoyShockLibrary to be able to use JoyCons, Pro Controllers, and DualShock 4s similarly to how you'd use other devices, this has everything you need to know.
int buttons contains the states of all the controller's buttons with the following masks:
0x00001 - d-pad up
0x00002 - d-pad down
0x00004 - d-pad left
0x00008 - d-pad right
0x00010 - + on Nintendo devices, Options on DS4
0x00020 - - on Nintendo devices, Share on DS4
0x00040 - left-stick click on Nintendo devices, L3 on DS4
0x00080 - right-stick click on Nintendo devices, R3 on DS4
0x00100 - L on Nintendo devices, L1 on DS4
0x00200 - R on Nintendo devices, R1 on DS4
0x00400 - ZL on Nintendo devices, L2 on DS4
0x00800 - ZR on Nintendo devices, R2 on DS4
0x01000 - the South face-button: B on Nintendo devices, ⨉ on DS4
0x02000 - the East face-button: A on Nintendo devices, ○ on DS4
0x04000 - the West face-button: Y on Nintendo devices, □ on DS4
0x08000 - the North face-button: X on Nintendo devices, △ on DS4
0x10000 - Home on Nintendo devices, PS on DS4
0x20000 - Capture on Nintendo devices, touchpad click on DS4
0x40000 - SL on Nintendo JoyCons
0x80000 - SR on Nintendo JoyCons
float lTrigger - how far has the left trigger been pressed? This will be 1 or 0 on Nintendo devices, which don't have analog triggers
float rTrigger - how far has the right trigger been pressed? This will be 1 or 0 on Nintendo devices, which don't have analog triggers
float stickLX, stickLY - left-stick X axis and Y axis, respectively, from -1 to 1
float stickRX, stickRX - right-stick X axis and Y axis, respectively, from -1 to 1
struct IMU_STATE - Each supported device contains an IMU which has a 3-axis accelerometer and a 3-axis gyroscope. IMU_STATE is where you find that info.
float accelX, accelY, accelZ - accelerometer X axis, Y axis, and Z axis, respectively, in g (g-force).
float gyroX, gyroY, gyroZ - gyroscope angular velocity X, Y, and Z, respectively, in dps (degrees per second), when correctly calibrated.
Functions
All these functions should be thread-safe, and none of them should cause any harm if given the wrong handle. If they do, please report this to me as an isuse.
int JslConnectDevices() - Register any connected devices. Returns the number of devices connected, which is helpful for getting the handles for those devices with the next function.
int JslGetConnectedDeviceHandles(int* deviceHandleArray, int size) - Fills the array deviceHandleArray of size size with the handles for all connected devices, up to the length of the array. Use the length returned by JslConnectDevices to make sure you've got all connected devices' handles.
void JslDisconnectAndDisposeAll() - Disconnect devices, no longer polling them for input.
JOY_SHOCK_STATE JslGetSimpleState(int deviceId) - Get the latest button + trigger + stick state for the controller with the given id.
IMU_STATE JslGetIMUState(int deviceId) - Get the latest accelerometer + gyroscope state for the controller with the given id.
int JslGetButtons(int deviceId) - Get the latest button state for the controller with the given id. If you want more than just the buttons, it's more efficient to use JslGetSimpleState.
float JslGetLeftX/JslGetLeftY/JslGetRightX/JslGetRightY(int deviceId) - Get the latest stick state for the controller with the given id. If you want more than just a single stick axis, it's more efficient to use JslGetSimpleState.
float JslGetLeftTrigger/JslGetRightTrigger(int deviceId) - Get the latest trigger state for the controller with the given id. If you want more than just a single trigger, it's more efficient to use JslGetSimpleState.
float JslGetGyroX/JslGetGyroY/JslGetGyroZ(int deviceId) - Get the latest angular velocity for a given gyroscope axis. If you want more than just a single gyroscope axis velocity, it's more efficient to use JslGetIMUState.
float JslGetAccelX/JslGetAccelY/JslGetAccelZ(int deviceId) - Get the latest acceleration for a given axis. If you want more than just a accelerometer axis, it's more efficient to use JslGetIMUState.
float JslGetStickStep(int deviceId) - Different devices use different size data types and different ranges on those data types when reporting stick axes. For some calculations, it may be important to know the limits of the current device and work around them in different ways. This gives the smallest step size between two values for the given device's analog sticks.
float JslGetTriggerStep(int deviceId) - Some devices have analog triggers, some don't. For some calculations, it may be important to know the limits of the current device and work around them in different ways. This gives the smallest step size between two values for the given device's triggers, or 1.0 if they're actually just binary inputs.
float JslGetTriggerStep(int deviceId) - Some devices have analog triggers, some don't. For some calculations, it may be important to know the limits of the current device and work around them in different ways. This gives the smallest step size between two values for the given device's triggers, or 1.0 if they're actually just binary inputs.
float JslGetPollRate(int deviceId) - Different devices report back new information at different rates. For the given device, this gives how many times one would usually expect the device to report back per second.
void JslResetContinuousCalibration(int deviceId) - JoyShockLibrary has helpful functions for calibrating the gyroscope by averaging out its input over time. This deletes all calibration data that's been accumulated, if any, this session.
void JslStartContinuousCalibration(int deviceId) - Start collecting gyro data, recording the ongoing average and using that to offset gyro output.
void JslPauseContinuousCalibration(int deviceId) - Stop collecting gyro data, but don't delete it.
void JslGetCalibrationOffset(int deviceId, float& xOffset, float& yOffset, float& zOffset) - Get the calibrated offset value for the given device's gyro. You don't have to use it; all gyro output for this device is already being offset by this vector before leaving JoyShockLibrary.
void JslSetCalibrationOffset(int deviceId, float xOffset, float yOffset, float zOffset) - Manually set the calibrated offset value for the given device's gyro.
void JslSetCallback(void(*callback)(int, JOY_SHOCK_STATE, JOY_SHOCK_STATE, IMU_STATE, IMU_STATE, float)) - Set a callback function by which JoyShockLibrary can report the current state for each device. This callback will be given the deviceId for the reporting device, its current button + trigger + stick state, its previous button + trigger + stick state, its current accelerometer + gyro state, its previous accelerometer + gyro state, and the amount of time since the last report for this device (in seconds).
int JslGetControllerType(int deviceId) - What type of controller is this device?
Left JoyCon
Right JoyCon
Switch Pro Controller
DualShock 4
int JslGetControllerSplitType(int deviceId) - Is this a half-controller or full? If half, what kind?
Left half
Right half
Full controller
int JslGetControllerColour(int deviceId) - Get the colour of the controller. Only Nintendo devices support this. Others will report white.
void JslSetLightColour(int deviceId, int colour) - Set the light colour on the given controller. Only DualShock 4s support this. Players will often prefer to be able to disable the light, so make sure to give them that option, but when setting players up in a local multiplayer game, setting the light colour is a useful way to uniquely identify different controllers.
void JslSetPlayerNumber(int deviceId, int number) - Set the lights that indicate player number. This only works on Nintendo devices.
void JslSetRumble(int deviceId, int smallRumble, int bigRumble) - DualShock 4s have two types of rumble, and they can be set at the same time with different intensities. These can be set from 0 to 255. Nintendo devices support rumble as well, but totally differently. They call it "HD rumble", and it's a great feature, but JoyShockLibrary doesn't yet support it.
Known and Perceived Issues
Bluetooth connectivity
JoyShockLibrary doesn't yet support setting rumble and light colour for the DualShock 4 via Bluetooth.
JoyCons and Pro Controllers can only be connected by Bluetooth. Some Bluetooth adapters can't keep up with these devices, resulting in laggy input. This is especially common when more than one device is connected (such as when using a pair of JoyCons). There is nothing JoyShockMapper or JoyShockLibrary can do about this.
Gyro poll rate on Nintendo devices
The Nintendo devices report every 15ms, but their IMUs actually report every 5ms. Every 15ms report includes the last 3 gyro and accelerometer reports. When creating the latest IMU state for Nintendo devices, JoyShockLibrary averages out those 3 gyro and accelerometer reports, so that it can best include all that information in a sensible format. For things like controlling a cursor on a plane, this should be of little to no consequence, since the result is the same as adding all 3 reports separately over shorter time intervals. But for representing real 3D rotations of the controller, this causes the Nintendo devices to be slightly less accurate than they could be, because we're combining 3 rotations in a simplistic way.
In a future version I hope to either combine the 3 rotations in a way that works better in 3D, or to add a way for a single controller event to report several IMU events at the same time.
Credits
I'm Jibb Smart, and I made JoyShockLibrary.
JoyShockLibrary uses substantial portions of mfosse's JoyCon-Driver, a vJoy feeder for most communication with Nintendo devices, building on it with info from dekuNukem's Nintendo Switch Reverse Engineering page in order to (for example) unpack all gyro and accelerometer samples from each report.
JoyShockLibrary's DualShock 4 support would likely not be possible without the info available on PSDevWiki and Eleccelerator Wiki. chrippa's ds4drv was also a handy reference for getting rumble and lights working right away.
This software also relies on and links signal11's HIDAPI to connect to USB and Bluetooth devices. Since HIDAPI is linked statically, .objs are included. Since .objs may need to be compiled with the same compiler version as the dll itself, HIDAPI itself is included in a .zip.
