feat(input): add absolute pointer and scroll

gateway/apollo_input.go

@@ -19,11 +19,11 @@ type apolloInputPacket struct {
 	payload []byte
 }
 
-func encodeApolloInputEvent(event InputEvent) (apolloInputPacket, error) {
+func encodeApolloInputEvent(event InputEvent) ([]apolloInputPacket, error) {
 	switch event.Device {
 	case "keyboard":
 		if event.Code < 0 || event.Code > 0xffff || len(event.Payload) > 1 {
-			return apolloInputPacket{}, ErrInputMalformed
+			return nil, ErrInputMalformed
 		}
 		packet := make([]byte, 14)
 		binary.BigEndian.PutUint32(packet[:4], 10)
@@ -36,10 +36,10 @@ func encodeApolloInputEvent(event InputEvent) (apolloInputPacket, error) {
 		if len(event.Payload) == 1 {
 			packet[11] = event.Payload[0]
 		}
-		return apolloInputPacket{channel: apolloChannelKeyboard, payload: packet}, nil
+		return []apolloInputPacket{{channel: apolloChannelKeyboard, payload: packet}}, nil
 	case "mouse-button":
 		if event.Code < 1 || event.Code > 8 || len(event.Payload) != 0 {
-			return apolloInputPacket{}, ErrInputMalformed
+			return nil, ErrInputMalformed
 		}
 		packet := make([]byte, 9)
 		binary.BigEndian.PutUint32(packet[:4], 5)
@@ -49,28 +49,28 @@ func encodeApolloInputEvent(event InputEvent) (apolloInputPacket, error) {
 		}
 		binary.LittleEndian.PutUint32(packet[4:8], magic)
 		packet[8] = byte(event.Code)
-		return apolloInputPacket{channel: apolloChannelMouse, payload: packet}, nil
+		return []apolloInputPacket{{channel: apolloChannelMouse, payload: packet}}, nil
 	case "mouse-relative":
 		if event.Pressed || len(event.Payload) != 4 {
-			return apolloInputPacket{}, ErrInputMalformed
+			return nil, ErrInputMalformed
 		}
 		packet := make([]byte, 12)
 		binary.BigEndian.PutUint32(packet[:4], 8)
 		binary.LittleEndian.PutUint32(packet[4:8], 7)
 		copy(packet[8:], event.Payload)
-		return apolloInputPacket{channel: apolloChannelMouse, payload: packet}, nil
+		return []apolloInputPacket{{channel: apolloChannelMouse, payload: packet}}, nil
 	case "utf8":
 		if event.Pressed || len(event.Payload) == 0 || len(event.Payload) > utf8.UTFMax || !utf8.Valid(event.Payload) || utf8.RuneCount(event.Payload) != 1 {
-			return apolloInputPacket{}, ErrInputMalformed
+			return nil, ErrInputMalformed
 		}
 		packet := make([]byte, 8+len(event.Payload))
 		binary.BigEndian.PutUint32(packet[:4], uint32(4+len(event.Payload)))
 		binary.LittleEndian.PutUint32(packet[4:8], 0x17)
 		copy(packet[8:], event.Payload)
-		return apolloInputPacket{channel: apolloChannelUTF8, payload: packet}, nil
+		return []apolloInputPacket{{channel: apolloChannelUTF8, payload: packet}}, nil
 	case "controller":
 		if event.Code < 0 || event.Code > 15 || len(event.Payload) != 16 {
-			return apolloInputPacket{}, ErrInputMalformed
+			return nil, ErrInputMalformed
 		}
 		packet := make([]byte, 34)
 		binary.BigEndian.PutUint32(packet[:4], 30)
@@ -83,8 +83,44 @@ func encodeApolloInputEvent(event InputEvent) (apolloInputPacket, error) {
 		binary.LittleEndian.PutUint16(packet[28:30], 0x9c)
 		copy(packet[30:32], event.Payload[14:16])
 		binary.LittleEndian.PutUint16(packet[32:34], 0x55)
-		return apolloInputPacket{channel: apolloChannelGamepad + uint8(event.Code), payload: packet}, nil
+		return []apolloInputPacket{{channel: apolloChannelGamepad + uint8(event.Code), payload: packet}}, nil
+	case "mouse-absolute":
+		if event.Pressed || event.Code != 0 || !validAbsolutePayload(event.Payload) {
+			return nil, ErrInputMalformed
+		}
+		width, height := binary.BigEndian.Uint16(event.Payload[4:6]), binary.BigEndian.Uint16(event.Payload[6:8])
+		if width < 2 || height < 2 || width > 0x7fff || height > 0x7fff {
+			return nil, ErrInputMalformed
+		}
+		packet := make([]byte, 18)
+		binary.BigEndian.PutUint32(packet[:4], 14)
+		binary.LittleEndian.PutUint32(packet[4:8], 5)
+		copy(packet[8:12], event.Payload[:4])
+		binary.BigEndian.PutUint16(packet[14:16], width-1)
+		binary.BigEndian.PutUint16(packet[16:18], height-1)
+		return []apolloInputPacket{{channel: apolloChannelMouse, payload: packet}}, nil
+	case "mouse-scroll":
+		if event.Pressed || event.Code != 0 || len(event.Payload) != 4 {
+			return nil, ErrInputMalformed
+		}
+		packets := make([]apolloInputPacket, 0, 2)
+		if event.Payload[0] != 0 || event.Payload[1] != 0 {
+			packet := make([]byte, 14)
+			binary.BigEndian.PutUint32(packet[:4], 10)
+			binary.LittleEndian.PutUint32(packet[4:8], 10)
+			copy(packet[8:10], event.Payload[:2])
+			copy(packet[10:12], event.Payload[:2])
+			packets = append(packets, apolloInputPacket{channel: apolloChannelMouse, payload: packet})
+		}
+		if event.Payload[2] != 0 || event.Payload[3] != 0 {
+			packet := make([]byte, 10)
+			binary.BigEndian.PutUint32(packet[:4], 6)
+			binary.LittleEndian.PutUint32(packet[4:8], 0x55000001)
+			copy(packet[8:10], event.Payload[2:4])
+			packets = append(packets, apolloInputPacket{channel: apolloChannelMouse, payload: packet})
+		}
+		return packets, nil
 	default:
-		return apolloInputPacket{}, ErrInputMalformed
+		return nil, ErrInputMalformed
 	}
 }