feature: Add dummy mode

ardriver/dummy/dummy_ar.go

@@ -0,0 +1,40 @@
+//go:build dummy_ar
+// +build dummy_ar
+
+package dummy
+
+import (
+	"git.terah.dev/UnrealXR/unrealxr/ardriver/commons"
+)
+
+var IsDummyDeviceEnabled = true
+
+// Implements commons.ARDevice
+type DummyDevice struct {
+}
+
+func (device *DummyDevice) Initialize() error {
+	return nil
+}
+
+func (device *DummyDevice) End() error {
+	return nil
+}
+
+func (device *DummyDevice) IsPollingLibrary() bool {
+	return false
+}
+
+func (device *DummyDevice) IsEventBasedLibrary() bool {
+	return false
+}
+
+func (device *DummyDevice) Poll() error {
+	return nil
+}
+
+func (device *DummyDevice) RegisterEventListeners(*commons.AREventListener) {}
+
+func New() (*DummyDevice, error) {
+	return &DummyDevice{}, nil
+}

ardriver/dummy/dummy_ar_disabled.go

@@ -0,0 +1,42 @@
+//go:build !dummy_ar
+// +build !dummy_ar
+
+package dummy
+
+import (
+	"fmt"
+
+	"git.terah.dev/UnrealXR/unrealxr/ardriver/commons"
+)
+
+var IsDummyDeviceEnabled = false
+
+// Implements commons.ARDevice
+type DummyDevice struct {
+}
+
+func (device *DummyDevice) Initialize() error {
+	return fmt.Errorf("dummy device is not enabled")
+}
+
+func (device *DummyDevice) End() error {
+	return fmt.Errorf("dummy device is not enabled")
+}
+
+func (device *DummyDevice) IsPollingLibrary() bool {
+	return false
+}
+
+func (device *DummyDevice) IsEventBasedLibrary() bool {
+	return false
+}
+
+func (device *DummyDevice) Poll() error {
+	return fmt.Errorf("dummy device is not enabled")
+}
+
+func (device *DummyDevice) RegisterEventListeners(*commons.AREventListener) {}
+
+func New() (*DummyDevice, error) {
+	return nil, fmt.Errorf("dummy device is not enabled")
+}