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internal/gamepad: bug fix: wrong offset especially on 32bit Linux

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Closes #2122
This commit is contained in:
Hajime Hoshi 2022-06-05 12:48:44 +09:00
parent 744340da5e
commit 51fe48fb76
1 changed files with 8 additions and 3 deletions
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11
internal/gamepad/gamepad_linux.go
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@ -306,11 +306,16 @@ func (g *nativeGamepad) update(gamepad *gamepads) error {
return fmt.Errorf("gamepad: Read failed: %w", err) return fmt.Errorf("gamepad: Read failed: %w", err)
} }
const (
offsetTyp = unsafe.Offsetof(input_event{}.typ)
offsetCode = unsafe.Offsetof(input_event{}.code)
offsetValue = unsafe.Offsetof(input_event{}.value)
)
// time is not used. // time is not used.
e := input_event{ e := input_event{
typ: uint16(buf[16]) | uint16(buf[17])<<8, typ: uint16(buf[offsetTyp]) | uint16(buf[offsetTyp+1])<<8,
code: uint16(buf[18]) | uint16(buf[19])<<8, code: uint16(buf[offsetCode]) | uint16(buf[offsetCode+1])<<8,
value: int32(buf[20]) | int32(buf[21])<<8 | int32(buf[22])<<16 | int32(buf[23])<<24, value: int32(buf[offsetValue]) | int32(buf[offsetValue+1])<<8 | int32(buf[offsetValue+2])<<16 | int32(buf[offsetValue+3])<<24,
} }
if e.typ == unix.EV_SYN { if e.typ == unix.EV_SYN {