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stadia.go
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stadia.go
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package stadiacontroller
import (
"encoding/base64"
"errors"
"fmt"
"log"
"time"
)
const (
stadiaControllerVid = 0x18D1
stadiaControllerPid = 0x9400
)
type StadiaController struct {
device *Device
ticker *time.Ticker
err error
}
func NewStadiaController() *StadiaController {
ticker := time.NewTicker(1 * time.Second)
controller := &StadiaController{nil, ticker, nil}
go func() {
for range ticker.C {
if controller.device != nil || controller.err != nil {
continue
}
devices, err := Devices()
if err != nil {
controller.err = err
break
}
for _, device := range devices {
if device.VendorID == stadiaControllerVid && device.ProductID == stadiaControllerPid {
openDevice, err := device.Open()
if err != nil {
log.Printf("cannot open device %s: %v", device.Path, err)
break
}
log.Printf("opened device %s", device.Path)
controller.device = &openDevice
break
}
}
}
}()
return controller
}
func (c *StadiaController) Close() {
c.ticker.Stop()
if c.device == nil {
return
}
(*c.device).Close()
}
func (c *StadiaController) Vibrate(largeMotor, smallMotor byte) error {
if c.device == nil {
return c.err
}
return (*c.device).Write([]byte{0x05, largeMotor, largeMotor, smallMotor, smallMotor})
}
var RetryError = errors.New("retry")
func (c *StadiaController) GetReport() (Xbox360ControllerReport, error) {
report := Xbox360ControllerReport{}
if c.device == nil {
err := c.err
if err == nil {
err = RetryError
}
return report, err
}
buf, ok := <-(*c.device).ReadCh()
if !ok {
err := (*c.device).ReadError()
log.Printf("unable to read from controller: %v", err)
log.Printf("waiting for new controller")
(*c.device).Close()
c.device = nil
return report, RetryError
}
err := ParseReport(buf, &report)
if err != nil {
log.Printf("unable to parse controller report: %v", err)
return report, RetryError
}
return report, nil
}
func ParseReport(data []byte, report *Xbox360ControllerReport) error {
if len(data) == 0 {
return errors.New("cannot parse empty report")
}
if data[0] == 0x03 && len(data) >= 10 {
a := data[1]
b := data[2]
c := data[3]
// Update common buttons.
report.MaybeSetButton(Xbox360ControllerButtonA, (c&0b0100_0000) != 0)
report.MaybeSetButton(Xbox360ControllerButtonB, (c&0b0010_0000) != 0)
report.MaybeSetButton(Xbox360ControllerButtonX, (c&0b0001_0000) != 0)
report.MaybeSetButton(Xbox360ControllerButtonY, (c&0b0000_1000) != 0)
report.MaybeSetButton(Xbox360ControllerButtonLeftShoulder, (c&0b0000_0100) != 0)
report.MaybeSetButton(Xbox360ControllerButtonRightShoulder, (c&0b0000_0010) != 0)
report.MaybeSetButton(Xbox360ControllerButtonLeftThumb, (c&0b0000_0001) != 0)
report.MaybeSetButton(Xbox360ControllerButtonRightThumb, (b&0b1000_0000) != 0)
report.MaybeSetButton(Xbox360ControllerButtonBack, (b&0b0100_0000) != 0)
report.MaybeSetButton(Xbox360ControllerButtonStart, (b&0b0010_0000) != 0)
report.MaybeSetButton(Xbox360ControllerButtonGuide, (b&0b0001_0000) != 0)
report.Assistant = (b & 0b0000_0010) != 0
report.Capture = (b & 0b0000_0001) != 0
// Update DPad buttons.
switch a {
case 0:
report.SetButton(Xbox360ControllerButtonUp)
case 1:
report.SetButton(Xbox360ControllerButtonUp)
report.SetButton(Xbox360ControllerButtonRight)
case 2:
report.SetButton(Xbox360ControllerButtonRight)
case 3:
report.SetButton(Xbox360ControllerButtonRight)
report.SetButton(Xbox360ControllerButtonDown)
case 4:
report.SetButton(Xbox360ControllerButtonDown)
case 5:
report.SetButton(Xbox360ControllerButtonDown)
report.SetButton(Xbox360ControllerButtonLeft)
case 6:
report.SetButton(Xbox360ControllerButtonLeft)
case 7:
report.SetButton(Xbox360ControllerButtonLeft)
report.SetButton(Xbox360ControllerButtonUp)
}
// Normalize axes values.
// Port of https://github.com/MWisBest/StadiEm.
for i := 4; i < 8; i++ {
if data[i] <= 0x7F && data[i] > 0x00 {
data[i]--
}
}
// Set axes values.
lThumbX := convertAxisValue(data[4]) - 0x8000
lThumbY := -convertAxisValue(data[5]) + 0x7fff
rThumbX := convertAxisValue(data[6]) - 0x8000
rThumbY := -convertAxisValue(data[7]) + 0x7fff
if lThumbY == -1 {
lThumbY = 0
}
if rThumbY == -1 {
rThumbY = 0
}
report.SetLeftThumb(int16(lThumbX), int16(lThumbY))
report.SetRightThumb(int16(rThumbX), int16(rThumbY))
// Set triggers.
report.SetLeftTrigger(data[8])
report.SetRightTrigger(data[9])
return nil
}
return fmt.Errorf("unknown report format; raw report was %s", base64.StdEncoding.EncodeToString(data))
}
func convertAxisValue(byteValue byte) int32 {
value := int32(byteValue)
value = value<<8 | ((value << 1) & 0b1111)
if value == 0xfffe {
return 0xffff
}
return value
}