SkyPortal-plugin/Source/SkyPortal/Private/SkyPortalSubsystem.cpp

// A lot of this code is made because of the work of https://github.com/capull0/SkyDumper

#include "SkyPortalSubsystem.h"
#include "Engine/Engine.h"

DEFINE_LOG_CATEGORY(LogHIDApi);


void USkyPortalSubsystem::Initialize(FSubsystemCollectionBase& Collection)
{

	Super::Initialize(Collection);
	// Custom initialization logic
	UE_LOG(LogTemp, Warning, TEXT("SkyPortalSubsystem Initialized"));

	// Initialize HIDAPI
	int res = hid_init();
	if (res == 0)
	{
		UE_LOG(LogHIDApi, Log, TEXT("HIDAPI initialized successfully."));

	}
	else
	{
		UE_LOG(LogHIDApi, Error, TEXT("Failed to initialize HIDAPI."));
		HidError = hid_error(NULL);
		UE_LOG(LogHIDApi, Error, TEXT("%s"), *HidError);
	}

}

void USkyPortalSubsystem::Deinitialize()
{
	// Disconnect portal
	if (PortalDevice) {
		hid_close(PortalDevice);
	}
	hid_exit();


	UE_LOG(LogTemp, Warning, TEXT("SkyPortalSubsystem Deinitialized"));
	Super::Deinitialize();
}



/*
Number of endpoints : 2
found an IN End Point 0 with attributes interrupt and address 0x1
found an OUT End Point 1 with attributes interrupt and address 0x1
*/
bool USkyPortalSubsystem::ConnectPortal() {
	/*
		Declare two pointers to hold information about HID devices.
		"list" will point to the head of the linked list of devices,
		"attributes" will be used to iterate through the list.
	*/
	struct hid_device_info* list, * attributes;

	list = hid_enumerate(0x0, 0x0);
	// If `list` is NULL, that means no devices were found or there was an error.
	// In this case, print an error message and terminate the program.
	if (!list) {
		UE_LOG(LogHIDApi, Error, TEXT("No devices found"));
		// Get the error message from the HIDAPI
		HidError = hid_error(NULL);
		UE_LOG(LogHIDApi, Error, TEXT("%s"), *HidError);
		return false;
	}
	attributes = list;




	// Iterate through the linked list of devices
	int vendorCount = sizeof(VendorIds) / sizeof(VendorIds[0]);
	int productCount = sizeof(ProductIds) / sizeof(ProductIds[0]);

	while (attributes) {
		// Check if the devices match any of vendor_id and product_id 
		for (int i = 0; i < vendorCount; i++) {
			for (int j = 0; j < productCount; j++) {
				if (attributes->vendor_id == VendorIds[i] && attributes->product_id == ProductIds[j]) {
					UE_LOG(LogHIDApi, Display, TEXT("Portal found"));
					UE_LOG(LogHIDApi, Log, TEXT("Vendor ID: 0x%x, Product ID: 0x%x"), attributes->vendor_id, attributes->product_id);

					PortalDevice = hid_open(attributes->vendor_id, attributes->product_id, NULL);
					if (PortalDevice) {
						UE_LOG(LogHIDApi, Display, TEXT("Successful connection to Portal."));

						// Free the device list
						hid_free_enumeration(list);
						return true;
					}

					break;
				}
			}
		}

		// Move to the next device in the list
		attributes = attributes->next;
	}

	// Free the device list
	hid_free_enumeration(list);
	UE_LOG(LogHIDApi, Error, TEXT("No Portals found"));
	return false;
}



void USkyPortalSubsystem::ReadPortal() {
	if (PortalDevice) {
		hid_read(PortalDevice, PortalRawData, 16);
		//RawDataArray.Append(PortalRawData, 16);
	}

}