func rumble(e *evdev.Effect) {
e.Type = evdev.FFRumble
var r evdev.RumbleEffect
r.StrongMagnitude = 0
r.WeakMagnitude = 0xc000
e.SetData(r)
}
func constant(e *evdev.Effect) {
e.Type = evdev.FFConstant
e.Direction = 0x6000 // 135 degrees
var c evdev.ConstantEffect
c.Level = 0x2000 // Strength : 25 %
c.Envelope.AttackLength = 0x100
c.Envelope.AttackLevel = 0
c.Envelope.FadeLength = 0x100
c.Envelope.FadeLevel = 0
e.SetData(c)
}
func spring(e *evdev.Effect) {
e.Type = evdev.FFSpring
e.Direction = 0x6000 // 135 degrees
var c [2]evdev.ConditionEffect
c[0].RightSaturation = 0x7fff
c[0].LeftSaturation = 0x7fff
c[0].RightCoeff = 0x2000
c[0].LeftCoeff = 0x2000
c[0].Deadband = 0x0
c[0].Center = 0x0
c[1] = c[0]
e.SetData(c)
}
func periodic(e *evdev.Effect) {
e.Type = evdev.FFPeriodic
e.Direction = evdev.DirLeft // Along X axis
var p evdev.PeriodicEffect
p.Waveform = evdev.FFSine
p.Period = 26 // 0.1*0x100 = 0.1 second
p.Magnitude = 0x4000 // 0.5 * Maximum magnitude
p.Offset = 0
p.Phase = 0
p.Envelope.AttackLength = 0x100
p.Envelope.AttackLevel = 0
p.Envelope.FadeLength = 0x100
p.Envelope.FadeLevel = 0
e.SetData(p)
}
// setEffects creates, uploads and plays a new Force feedback effect.
// This function uploads only 1 effect, but it can deal with
// up to N effects at the same time. Where N is whatever value
// returned from `Device.ForceFeedbackCaps()`.
func setEffects(dev *evdev.Device) {
_, caps := dev.ForceFeedbackCaps()
var effect evdev.Effect
effect.Id = -1
effect.Trigger.Button = 0
effect.Trigger.Interval = 0
effect.Replay.Length = 20000 // 20 seconds
effect.Replay.Delay = 0
// Some samples of various effect types.
// (un)comment any one to try them out. Note that
// the device must support a given effect type.
switch {
case dev.Test(caps, evdev.FFRumble):
rumble(&effect)
case dev.Test(caps, evdev.FFPeriodic):
periodic(&effect)
case dev.Test(caps, evdev.FFConstant):
constant(&effect)
case dev.Test(caps, evdev.FFSpring):
spring(&effect)
case dev.Test(caps, evdev.FFDamper):
damper(&effect)
}
// Upload the effect.
dev.SetEffects(&effect)
fmt.Printf("Effect id: %d\n", effect.Id)
// Play the effect.
dev.PlayEffect(effect.Id)
// Delete the effect.
dev.UnsetEffects(&effect)
}