HIDInputInterface.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include <IOKit/hid/IOHIDLib.h>
#include "GenericPlatform/GenericApplicationMessageHandler.h"
#include "Templates/SharedPointer.h"
 
#define MAX_NUM_HIDINPUT_CONTROLLERS 4
 
#define MAX_NUM_CONTROLLER_BUTTONS 24
 
class HIDInputInterface
{
public:
 
    static TSharedRef<HIDInputInterface> Create(const TSharedRef<FGenericApplicationMessageHandler>& InMessageHandler);
 
    void SendControllerEvents();
 
    void SetMessageHandler(const TSharedRef<FGenericApplicationMessageHandler>& InMessageHandler)
    {
        MessageHandler = InMessageHandler;
    }
 
    bool IsGamepadAttached() const { return bIsGamepadAttached; }
 
private:
 
    HIDInputInterface(const TSharedRef<FGenericApplicationMessageHandler>& MessageHandler);
 
    void OnNewHIDController(IOReturn Result, IOHIDDeviceRef DeviceRef);
 
    static CFMutableDictionaryRef CreateDeviceMatchingDictionary(UInt32 UsagePage, UInt32 Usage);
    static void HIDDeviceMatchingCallback(void* Context, IOReturn Result, void* Sender, IOHIDDeviceRef DeviceRef);
    static void HIDDeviceRemovalCallback(void* Context, IOReturn Result, void* Sender, IOHIDDeviceRef DeviceRef);
 
private:
 
    struct FHIDElementInfo
    {
        IOHIDElementRef ElementRef;
        IOHIDElementType Type;
        uint32 UsagePage;
        uint32 Usage;
        int32 MinValue;
        int32 MaxValue;
    };
 
    struct FHIDDeviceInfo
    {
        IOHIDDeviceRef DeviceRef;
        TArray<FHIDElementInfo> Elements;
        int8 ButtonsMapping[MAX_NUM_CONTROLLER_BUTTONS];
        uint16 LeftAnalogXMapping;
        uint16 LeftAnalogYMapping;
        uint16 LeftTriggerAnalogMapping;
        uint16 RightAnalogXMapping;
        uint16 RightAnalogYMapping;
        uint16 RightTriggerAnalogMapping;
 
        void SetupMappings();
    };
 
    struct FXBox360ControllerID
    {
        const int32 VendorID;
        const int32 ProductID;
    };
 
    struct FControllerState
    {
        bool ButtonStates[MAX_NUM_CONTROLLER_BUTTONS];
 
        double NextRepeatTime[MAX_NUM_CONTROLLER_BUTTONS];
 
        int32 LeftAnalogX;
        
        int32 LeftAnalogY;
 
        int32 RightAnalogX;
 
        int32 RightAnalogY;
 
        int32 LeftTriggerAnalog;
 
        int32 RightTriggerAnalog;
 
        int32 ControllerId;
 
        FHIDDeviceInfo Device;
    };
 
private:
 
    FGamepadKeyNames::Type Buttons[MAX_NUM_CONTROLLER_BUTTONS];
 
    FControllerState ControllerStates[MAX_NUM_HIDINPUT_CONTROLLERS];
 
    float InitialButtonRepeatDelay;
 
    float ButtonRepeatDelay;
 
    bool bIsGamepadAttached;
 
    IOHIDManagerRef HIDManager;
 
    TSharedRef<FGenericApplicationMessageHandler> MessageHandler;
};