dorisoy_HardwareMonitor/LibreHardwareMonitorLib/Interop/NvApi.cs
using System;
using System.Runtime.InteropServices;
using System.Text;

namespace LibreHardwareMonitor.Interop
{
    internal static class NvApi
    {
        public const int MAX_CLOCKS_PER_GPU = 0x120;
        public const int MAX_COOLERS_PER_GPU = 20;
        public const int MAX_FAN_CONTROLLER_ITEMS = 32;
        public const int MAX_FAN_COOLERS_STATUS_ITEMS = 32;
        public const int MAX_GPU_PUBLIC_CLOCKS = 32;
        public const int MAX_GPU_UTILIZATIONS = 8;
        public const int MAX_MEMORY_VALUES_PER_GPU = 5;
        public const int MAX_PHYSICAL_GPUS = 64;
        public const int MAX_POWER_TOPOLOGIES = 4;
        public const int MAX_THERMAL_SENSORS_PER_GPU = 3;
        public const int MAX_USAGES_PER_GPU = 8;
        public const int THERMAL_SENSOR_RESERVED_COUNT = 8;
        public const int THERMAL_SENSOR_TEMPERATURE_COUNT = 32;

        public const int SHORT_STRING_MAX = 64;

        public static readonly NvAPI_EnumNvidiaDisplayHandleDelegate NvAPI_EnumNvidiaDisplayHandle;
        public static readonly NvAPI_EnumPhysicalGPUsDelegate NvAPI_EnumPhysicalGPUs;
        public static readonly NvAPI_GetDisplayDriverVersionDelegate NvAPI_GetDisplayDriverVersion;
        public static readonly NvAPI_GetPhysicalGPUsFromDisplayDelegate NvAPI_GetPhysicalGPUsFromDisplay;
        public static readonly NvAPI_GPU_ClientFanCoolersGetControlDelegate NvAPI_GPU_ClientFanCoolersGetControl;
        public static readonly NvAPI_GPU_ClientFanCoolersGetStatusDelegate NvAPI_GPU_ClientFanCoolersGetStatus;
        public static readonly NvAPI_GPU_ClientFanCoolersSetControlDelegate NvAPI_GPU_ClientFanCoolersSetControl;
        public static readonly NvAPI_GPU_ClientPowerTopologyGetStatusDelegate NvAPI_GPU_ClientPowerTopologyGetStatus;
        public static readonly NvAPI_GPU_GetAllClockFrequenciesDelegate NvAPI_GPU_GetAllClockFrequencies;
        public static readonly NvAPI_GPU_GetAllClocksDelegate NvAPI_GPU_GetAllClocks;
        public static readonly NvAPI_GPU_GetBusIdDelegate NvAPI_GPU_GetBusId;
        public static readonly NvAPI_GPU_GetCoolerSettingsDelegate NvAPI_GPU_GetCoolerSettings;
        public static readonly NvAPI_GPU_GetDynamicPstatesInfoExDelegate NvAPI_GPU_GetDynamicPstatesInfoEx;
        public static readonly NvAPI_GPU_GetMemoryInfoDelegate NvAPI_GPU_GetMemoryInfo;
        public static readonly NvAPI_GPU_GetPCIIdentifiersDelegate NvAPI_GPU_GetPCIIdentifiers;
        public static readonly NvAPI_GPU_GetTachReadingDelegate NvAPI_GPU_GetTachReading;
        public static readonly NvAPI_GPU_GetThermalSettingsDelegate NvAPI_GPU_GetThermalSettings;
        public static readonly NvAPI_GPU_GetUsagesDelegate NvAPI_GPU_GetUsages;
        public static readonly NvAPI_GPU_SetCoolerLevelsDelegate NvAPI_GPU_SetCoolerLevels;
        public static readonly NvAPI_GPU_GetThermalSensorsDelegate NvAPI_GPU_ThermalGetSensors;

        private static readonly NvAPI_GetInterfaceVersionStringDelegate _nvAPI_GetInterfaceVersionString;
        private static readonly NvAPI_GPU_GetFullNameDelegate _nvAPI_GPU_GetFullName;

        static NvApi()
        {
            NvAPI_InitializeDelegate nvApiInitialize;

            try
            {
                GetDelegate(0x0150E828, out nvApiInitialize);
            }
            catch (DllNotFoundException)
            {
                return;
            }
            catch (EntryPointNotFoundException)
            {
                return;
            }
            catch (ArgumentNullException)
            {
                return;
            }

            if (nvApiInitialize() == NvStatus.OK)
            {
                GetDelegate(0xE3640A56, out NvAPI_GPU_GetThermalSettings);
                GetDelegate(0xCEEE8E9F, out _nvAPI_GPU_GetFullName);
                GetDelegate(0x9ABDD40D, out NvAPI_EnumNvidiaDisplayHandle);
                GetDelegate(0x34EF9506, out NvAPI_GetPhysicalGPUsFromDisplay);
                GetDelegate(0xE5AC921F, out NvAPI_EnumPhysicalGPUs);
                GetDelegate(0x5F608315, out NvAPI_GPU_GetTachReading);
                GetDelegate(0x1BD69F49, out NvAPI_GPU_GetAllClocks);
                GetDelegate(0x60DED2ED, out NvAPI_GPU_GetDynamicPstatesInfoEx);
                GetDelegate(0x189A1FDF, out NvAPI_GPU_GetUsages);
                GetDelegate(0xDA141340, out NvAPI_GPU_GetCoolerSettings);
                GetDelegate(0x891FA0AE, out NvAPI_GPU_SetCoolerLevels);
                GetDelegate(0x774AA982, out NvAPI_GPU_GetMemoryInfo);
                GetDelegate(0xF951A4D1, out NvAPI_GetDisplayDriverVersion);
                GetDelegate(0x01053FA5, out _nvAPI_GetInterfaceVersionString);
                GetDelegate(0x2DDFB66E, out NvAPI_GPU_GetPCIIdentifiers);
                GetDelegate(0x1BE0B8E5, out NvAPI_GPU_GetBusId);
                GetDelegate(0x35AED5E8, out NvAPI_GPU_ClientFanCoolersGetStatus);
                GetDelegate(0xDCB616C3, out NvAPI_GPU_GetAllClockFrequencies);
                GetDelegate(0x814B209F, out NvAPI_GPU_ClientFanCoolersGetControl);
                GetDelegate(0xA58971A5, out NvAPI_GPU_ClientFanCoolersSetControl);
                GetDelegate(0x0EDCF624E, out NvAPI_GPU_ClientPowerTopologyGetStatus);
                GetDelegate(0x65FE3AAD, out NvAPI_GPU_ThermalGetSensors);

                IsAvailable = true;
            }
        }

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_EnumNvidiaDisplayHandleDelegate(int thisEnum, ref NvDisplayHandle displayHandle);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_EnumPhysicalGPUsDelegate([Out] NvPhysicalGpuHandle[] gpuHandles, out int gpuCount);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GetDisplayDriverVersionDelegate(NvDisplayHandle displayHandle, [In, Out] ref NvDisplayDriverVersion nvDisplayDriverVersion);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GetInterfaceVersionStringDelegate(StringBuilder version);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GetPhysicalGPUsFromDisplayDelegate(NvDisplayHandle displayHandle, [Out] NvPhysicalGpuHandle[] gpuHandles, out uint gpuCount);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_ClientFanCoolersGetControlDelegate(NvPhysicalGpuHandle gpuHandle, ref NvFanCoolerControl control);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_ClientFanCoolersGetStatusDelegate(NvPhysicalGpuHandle gpuHandle, ref NvFanCoolersStatus fanCoolersStatus);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_ClientFanCoolersSetControlDelegate(NvPhysicalGpuHandle gpuHandle, ref NvFanCoolerControl control);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_ClientPowerTopologyGetStatusDelegate(NvPhysicalGpuHandle gpuHandle, ref NvPowerTopology powerTopology);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetAllClockFrequenciesDelegate(NvPhysicalGpuHandle gpuHandle, ref NvGpuClockFrequencies clockFrequencies);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetAllClocksDelegate(NvPhysicalGpuHandle gpuHandle, ref NvClocks nvClocks);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetBusIdDelegate(NvPhysicalGpuHandle gpuHandle, out uint busId);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetCoolerSettingsDelegate(NvPhysicalGpuHandle gpuHandle, NvCoolerTarget coolerTarget, ref NvCoolerSettings NvCoolerSettings);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetDynamicPstatesInfoExDelegate(NvPhysicalGpuHandle gpuHandle, ref NvDynamicPStatesInfo nvPStates);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetMemoryInfoDelegate(NvDisplayHandle displayHandle, ref NvMemoryInfo nvMemoryInfo);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetPCIIdentifiersDelegate(NvPhysicalGpuHandle gpuHandle, out uint deviceId, out uint subSystemId, out uint revisionId, out uint extDeviceId);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetTachReadingDelegate(NvPhysicalGpuHandle gpuHandle, out int value);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetThermalSettingsDelegate(NvPhysicalGpuHandle gpuHandle, int sensorIndex, ref NvThermalSettings NvThermalSettings);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetUsagesDelegate(NvPhysicalGpuHandle gpuHandle, ref NvUsages nvUsages);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_SetCoolerLevelsDelegate(NvPhysicalGpuHandle gpuHandle, int coolerIndex, ref NvCoolerLevels NvCoolerLevels);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate NvStatus NvAPI_GPU_GetThermalSensorsDelegate(NvPhysicalGpuHandle gpuHandle, ref NvThermalSensors nvThermalSensors);

        public enum NvFanControlMode : uint
        {
            Auto = 0,
            Manual = 1
        }

        public enum NvLevelPolicy : uint
        {
            None = 0,
            Manual = 1,
            Performance = 2,
            TemperatureDiscrete = 4,
            TemperatureContinuous = 8,
            Silent = 16,
            Auto = 32
        }

        public enum NvPowerTopologyDomain : uint
        {
            Gpu = 0,
            Board
        }

        public enum NvUtilizationDomain
        {
            Gpu, // Core
            FrameBuffer, // Memory Controller
            VideoEngine, // Video Engine
            BusInterface // Bus
        }

        public static bool IsAvailable { get; }

        [DllImport(@"nvapi.dll", EntryPoint = @"nvapi_QueryInterface", CallingConvention = CallingConvention.Cdecl, PreserveSig = true)]
        private static extern IntPtr NvAPI32_QueryInterface(uint interfaceId);

        [DllImport(@"nvapi64.dll", EntryPoint = @"nvapi_QueryInterface", CallingConvention = CallingConvention.Cdecl, PreserveSig = true)]
        private static extern IntPtr NvAPI64_QueryInterface(uint interfaceId);

        public static NvStatus NvAPI_GPU_GetFullName(NvPhysicalGpuHandle gpuHandle, out string name)
        {
            StringBuilder builder = new(SHORT_STRING_MAX);
            NvStatus status = _nvAPI_GPU_GetFullName?.Invoke(gpuHandle, builder) ?? NvStatus.FunctionNotFound;

            name = builder.ToString();
            return status;
        }

        public static NvStatus NvAPI_GetInterfaceVersionString(out string version)
        {
            StringBuilder builder = new(SHORT_STRING_MAX);
            NvStatus status = _nvAPI_GetInterfaceVersionString?.Invoke(builder) ?? NvStatus.FunctionNotFound;

            version = builder.ToString();
            return status;
        }

        private static void GetDelegate<T>(uint id, out T newDelegate) where T : class
        {
            IntPtr ptr = Environment.Is64BitProcess ? NvAPI64_QueryInterface(id) : NvAPI32_QueryInterface(id);

            if (ptr != IntPtr.Zero)
                newDelegate = Marshal.GetDelegateForFunctionPointer(ptr, typeof(T)) as T;
            else
                newDelegate = null;
        }

        internal static int MAKE_NVAPI_VERSION<T>(int ver)
        {
            return Marshal.SizeOf<T>() | (ver << 16);
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvFanCoolerControl
        {
            public uint Version;
            private readonly uint _reserved;
            public uint Count;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8, ArraySubType = UnmanagedType.U4)]
            private readonly uint[] _reserved2;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_FAN_CONTROLLER_ITEMS)]
            public NvFanCoolerControlItem[] Items;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvFanCoolerControlItem
        {
            public uint CoolerId;
            public uint Level;
            public NvFanControlMode ControlMode;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8, ArraySubType = UnmanagedType.U4)]
            private readonly uint[] _reserved;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvPowerTopology
        {
            public int Version;
            public uint Count;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_POWER_TOPOLOGIES, ArraySubType = UnmanagedType.Struct)]
            public NvPowerTopologyEntry[] Entries;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvPowerTopologyEntry
        {
            public NvPowerTopologyDomain Domain;
            private readonly uint _reserved;
            public uint PowerUsage;
            private readonly uint _reserved1;
        }

        internal enum NvStatus
        {
            OK = 0,
            Error = -1,
            LibraryNotFound = -2,
            NoImplementation = -3,
            ApiNotInitialized = -4,
            InvalidArgument = -5,
            NvidiaDeviceNotFound = -6,
            EndEnumeration = -7,
            InvalidHandle = -8,
            IncompatibleStructVersion = -9,
            HandleInvalidated = -10,
            OpenGlContextNotCurrent = -11,
            NoGlExpert = -12,
            InstrumentationDisabled = -13,
            ExpectedLogicalGpuHandle = -100,
            ExpectedPhysicalGpuHandle = -101,
            ExpectedDisplayHandle = -102,
            InvalidCombination = -103,
            NotSupported = -104,
            PortIdNotFound = -105,
            ExpectedUnattachedDisplayHandle = -106,
            InvalidPerfLevel = -107,
            DeviceBusy = -108,
            NvPersistFileNotFound = -109,
            PersistDataNotFound = -110,
            ExpectedTvDisplay = -111,
            ExpectedTvDisplayOnConnector = -112,
            NoActiveSliTopology = -113,
            SliRenderingModeNotAllowed = -114,
            ExpectedDigitalFlatPanel = -115,
            ArgumentExceedMaxSize = -116,
            DeviceSwitchingNotAllowed = -117,
            TestingClocksNotSupported = -118,
            UnknownUnderscanConfig = -119,
            TimeoutReconfiguringGpuTopo = -120,
            DataNotFound = -121,
            ExpectedAnalogDisplay = -122,
            NoVidLink = -123,
            RequiresReboot = -124,
            InvalidHybridMode = -125,
            MixedTargetTypes = -126,
            Syswow64NotSupported = -127,
            ImplicitSetGpuTopologyChangeNotAllowed = -128,
            RequestUserToCloseNonMigratableApps = -129,
            OutOfMemory = -130,
            WasStillDrawing = -131,
            FileNotFound = -132,
            TooManyUniqueStateObjects = -133,
            InvalidCall = -134,
            D3D101LibraryNotFound = -135,
            FunctionNotFound = -136
        }

        internal enum NvThermalController
        {
            None = 0,
            GpuInternal,
            Adm1032,
            Max6649,
            Max1617,
            Lm99,
            Lm89,
            Lm64,
            Adt7473,
            SbMax6649,
            VBiosEvt,
            OS,
            Unknown = -1
        }

        internal enum NvThermalTarget
        {
            None = 0,
            Gpu = 1,
            Memory = 2,
            PowerSupply = 4,
            Board = 8,
            VisualComputingBoard = 9,
            VisualComputingInlet = 10,
            VisualComputingOutlet = 11,
            All = 15,
            Unknown = -1
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvSensor
        {
            public NvThermalController Controller;
            public uint DefaultMinTemp;
            public uint DefaultMaxTemp;
            public uint CurrentTemp;
            public NvThermalTarget Target;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvThermalSettings
        {
            public uint Version;
            public uint Count;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_THERMAL_SENSORS_PER_GPU)]
            public NvSensor[] Sensor;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct NvDisplayHandle
        {
            private readonly IntPtr ptr;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct NvPhysicalGpuHandle
        {
            private readonly IntPtr ptr;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvClocks
        {
            public uint Version;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_CLOCKS_PER_GPU)]
            public uint[] Clock;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvDynamicPStatesInfo
        {
            public uint Version;
            public uint Flags;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_GPU_UTILIZATIONS)]
            public NvDynamicPState[] Utilizations;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvDynamicPState
        {
            public bool IsPresent;
            public int Percentage;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvUsages
        {
            public uint Version;
            private readonly uint _reserved;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
            public NvUsagesEntry[] Entries;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvUsagesEntry
        {
            public uint IsPresent;
            public uint Percentage;
            private readonly uint _reserved1;
            private readonly uint _reserved2;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvCooler
        {
            public int Type;
            public int Controller;
            public int DefaultMin;
            public int DefaultMax;
            public int CurrentMin;
            public int CurrentMax;
            public int CurrentLevel;
            public int DefaultPolicy;
            public int CurrentPolicy;
            public int Target;
            public int ControlType;
            public int Active;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvFanCoolersStatus
        {
            public uint Version;
            public uint Count;

            public ulong Reserved1;
            public ulong Reserved2;
            public ulong Reserved3;
            public ulong Reserved4;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_FAN_COOLERS_STATUS_ITEMS)]
            internal NvFanCoolersStatusItem[] Items;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvFanCoolersStatusItem
        {
            public uint CoolerId;
            public uint CurrentRpm;
            public uint CurrentMinLevel;
            public uint CurrentMaxLevel;
            public uint CurrentLevel;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8, ArraySubType = UnmanagedType.U4)]
            private readonly uint[] _reserved;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvCoolerSettings
        {
            public uint Version;
            public uint Count;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_COOLERS_PER_GPU)]
            public NvCooler[] Cooler;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvLevel
        {
            public int Level;
            public NvLevelPolicy Policy;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvCoolerLevels
        {
            public uint Version;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_COOLERS_PER_GPU)]
            public NvLevel[] Levels;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        public struct NvThermalSensors
        {
            internal uint Version;
            internal uint Mask;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = THERMAL_SENSOR_RESERVED_COUNT)]
            internal int[] Reserved;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = THERMAL_SENSOR_TEMPERATURE_COUNT)]
            internal int[] Temperatures;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvMemoryInfo
        {
            public uint Version;

            public uint DedicatedVideoMemory;

            public uint AvailableDedicatedVideoMemory;

            public uint SystemVideoMemory;

            public uint SharedSystemMemory;

            public uint CurrentAvailableDedicatedVideoMemory;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvDisplayDriverVersion
        {
            public uint Version;
            public uint DriverVersion;
            public uint BldChangeListNum;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = SHORT_STRING_MAX)]
            public string BuildBranch;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = SHORT_STRING_MAX)]
            public string Adapter;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvGpuClockFrequencies
        {
            public uint Version;
            private readonly uint _reserved;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_GPU_PUBLIC_CLOCKS)]
            public NvGpuClockFrequenciesDomain[] Clocks;
        }

        internal enum NvGpuPublicClockId
        {
            Graphics = 0,
            Memory = 4,
            Processor = 7,
            Video = 8,
            Undefined = MAX_CLOCKS_PER_GPU
        }

        internal enum NvGpuClockFrequenciesClockType
        {
            CurrentFrequency,
            BaseClock,
            BoostClock,
            ClockTypeNumber,
        }

        internal enum NvCoolerTarget
        {
            None = 0,
            Gpu,
            Memory,
            PowerSupply = 4,
            All = 7 // This cooler cools all of the components related to its target gpu.
        }

        [StructLayout(LayoutKind.Sequential, Pack = 8)]
        internal struct NvGpuClockFrequenciesDomain
        {
            private readonly uint _isPresent;
            public uint Frequency;

            public bool IsPresent => (_isPresent & 1) != 0;
        }

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate NvStatus NvAPI_InitializeDelegate();

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate NvStatus NvAPI_GPU_GetFullNameDelegate(NvPhysicalGpuHandle gpuHandle, StringBuilder name);
    }
}
