feat(GamePad): Implemented mappings

mapping.go

@@ -1,16 +1,22 @@
 package main
 
 import (
+	"fmt"
+
 	"gitlab.com/gomidi/midi/v2"
+	"github.com/bendahl/uinput"
 )
 
 type Mapping interface {
 	Is(midi.Message) bool
+	TriggerIfMatch(midi.Message, uinput.Gamepad) error
 }
 
 type ButtonMapping struct {
+	comment string
 	midiChannel uint8
 	midiKey uint8
+	gamepadKey int
 }
 
 func (m ButtonMapping) Is(msg midi.Message) bool {
@@ -24,9 +30,36 @@ func (m ButtonMapping) Is(msg midi.Message) bool {
 	}
 }
 
+func (m ButtonMapping) TriggerIfMatch(msg midi.Message, virtGamepad uinput.Gamepad) error {
+	if m.Is(msg) {
+		switch msg.Type() {
+		case midi.NoteOnMsg:
+			return virtGamepad.ButtonDown(m.gamepadKey)
+		case midi.NoteOffMsg:
+			return virtGamepad.ButtonUp(m.gamepadKey)
+		default:
+			return fmt.Errorf("Invalid message type triggered ButtonMapping")
+		}
+	}
+
+	return nil
+}
+
+type ControllerAxis int
+
+const (
+	LeftX ControllerAxis = iota
+	LeftY
+	RightX
+	RightY
+)
+
 type ControlMapping struct {
+	comment string
 	midiChannel uint8
 	midiController uint8
+	axis ControllerAxis
+	isSigned bool
 }
 
 func (m ControlMapping) Is(msg midi.Message) bool {
@@ -38,3 +71,34 @@ func (m ControlMapping) Is(msg midi.Message) bool {
 		return false
 	}
 }
+
+func (m ControlMapping) TriggerIfMatch(msg midi.Message, virtGamepad uinput.Gamepad) error {
+	if m.Is(msg) {
+		var (
+			valueAbsolute uint8
+			valueNormalised float32
+		)
+
+		msg.GetControlChange(nil, nil, &valueAbsolute)
+
+		// value is 0-127, normalise
+		valueNormalised = float32(valueAbsolute) / 127
+		if m.isSigned {
+			valueNormalised *= 2
+			valueNormalised -= 1
+		}
+
+		switch m.axis {
+		case LeftX:
+			return virtGamepad.LeftStickMoveX(valueNormalised)
+		case LeftY:
+			return virtGamepad.LeftStickMoveY(valueNormalised)
+		case RightX:
+			return virtGamepad.RightStickMoveX(valueNormalised)
+		case RightY:
+			return virtGamepad.RightStickMoveY(valueNormalised)
+		}
+	}
+
+	return nil
+}