/*

  Version: MPL 1.1/GPL 2.0/LGPL 2.1

  The contents of this file are subject to the Mozilla Public License Version

  1.1 (the "License"); you may not use this file except in compliance with

  the License. You may obtain a copy of the License at

  http://www.mozilla.org/MPL/

  Software distributed under the License is distributed on an "AS IS" basis,

  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

  for the specific language governing rights and limitations under the License.

  The Original Code is the Open Hardware Monitor code.

  The Initial Developer of the Original Code is 

  Michael Möller <m.moeller@gmx.ch>.

  Portions created by the Initial Developer are Copyright (C) 2009-2010

  the Initial Developer. All Rights Reserved.

  Contributor(s):

  Alternatively, the contents of this file may be used under the terms of

  either the GNU General Public License Version 2 or later (the "GPL"), or

  the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

  in which case the provisions of the GPL or the LGPL are applicable instead

  of those above. If you wish to allow use of your version of this file only

  under the terms of either the GPL or the LGPL, and not to allow others to

  use your version of this file under the terms of the MPL, indicate your

  decision by deleting the provisions above and replace them with the notice

  and other provisions required by the GPL or the LGPL. If you do not delete

  the provisions above, a recipient may use your version of this file under

  the terms of any one of the MPL, the GPL or the LGPL.

*/

using System;

using System.Runtime.InteropServices;

using System.Text;

namespace OpenHardwareMonitor.Hardware.Nvidia {

  internal enum NvStatus {

    OK = 0,

    ERROR = -1,

    LIBRARY_NOT_FOUND = -2,

    NO_IMPLEMENTATION = -3,

    API_NOT_INTIALIZED = -4,

    INVALID_ARGUMENT = -5,

    NVIDIA_DEVICE_NOT_FOUND = -6,

    END_ENUMERATION = -7,

    INVALID_HANDLE = -8,

    INCOMPATIBLE_STRUCT_VERSION = -9,

    HANDLE_INVALIDATED = -10,

    OPENGL_CONTEXT_NOT_CURRENT = -11,

    NO_GL_EXPERT = -12,

    INSTRUMENTATION_DISABLED = -13,

    EXPECTED_LOGICAL_GPU_HANDLE = -100,

    EXPECTED_PHYSICAL_GPU_HANDLE = -101,

    EXPECTED_DISPLAY_HANDLE = -102,

    INVALID_COMBINATION = -103,

    NOT_SUPPORTED = -104,

    PORTID_NOT_FOUND = -105,

    EXPECTED_UNATTACHED_DISPLAY_HANDLE = -106,

    INVALID_PERF_LEVEL = -107,

    DEVICE_BUSY = -108,

    NV_PERSIST_FILE_NOT_FOUND = -109,

    PERSIST_DATA_NOT_FOUND = -110,

    EXPECTED_TV_DISPLAY = -111,

    EXPECTED_TV_DISPLAY_ON_DCONNECTOR = -112,

    NO_ACTIVE_SLI_TOPOLOGY = -113,

    SLI_RENDERING_MODE_NOTALLOWED = -114,

    EXPECTED_DIGITAL_FLAT_PANEL = -115,

    ARGUMENT_EXCEED_MAX_SIZE = -116,

    DEVICE_SWITCHING_NOT_ALLOWED = -117,

    TESTING_CLOCKS_NOT_SUPPORTED = -118,

    UNKNOWN_UNDERSCAN_CONFIG = -119,

    TIMEOUT_RECONFIGURING_GPU_TOPO = -120,

    DATA_NOT_FOUND = -121,

    EXPECTED_ANALOG_DISPLAY = -122,

    NO_VIDLINK = -123,

    REQUIRES_REBOOT = -124,

    INVALID_HYBRID_MODE = -125,

    MIXED_TARGET_TYPES = -126,

    SYSWOW64_NOT_SUPPORTED = -127,

    IMPLICIT_SET_GPU_TOPOLOGY_CHANGE_NOT_ALLOWED = -128,

    REQUEST_USER_TO_CLOSE_NON_MIGRATABLE_APPS = -129,

    OUT_OF_MEMORY = -130,

    WAS_STILL_DRAWING = -131,

    FILE_NOT_FOUND = -132,

    TOO_MANY_UNIQUE_STATE_OBJECTS = -133,

    INVALID_CALL = -134,

    D3D10_1_LIBRARY_NOT_FOUND = -135,

    FUNCTION_NOT_FOUND = -136

  }

  internal enum NvThermalController {

    NONE = 0,

    GPU_INTERNAL,  

    ADM1032,

    MAX6649,       

    MAX1617,      

    LM99,      

    LM89,         

    LM64,         

    ADT7473,

    SBMAX6649,

    VBIOSEVT,  

    OS,    

    UNKNOWN = -1,

  }

  internal enum NvThermalTarget {

    NONE = 0,

    GPU = 1,

    MEMORY = 2,

    POWER_SUPPLY = 4,

    BOARD = 8,

    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 NvGPUThermalSettings {

    public uint Version;

    public uint Count;

    [MarshalAs(UnmanagedType.ByValArray, 

      SizeConst = NVAPI.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 = NVAPI.MAX_CLOCKS_PER_GPU)]

    public uint[] Clock;

  }

  [StructLayout(LayoutKind.Sequential, Pack = 8)]

  internal struct NvPState {

    public bool Present;

    public int Percentage;

  }

  [StructLayout(LayoutKind.Sequential, Pack = 8)]

  internal struct NvPStates {

    public uint Version;

    public uint Flags;

    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_PSTATES_PER_GPU)]

    public NvPState[] PStates;

  }

  [StructLayout(LayoutKind.Sequential, Pack = 8)]

  internal struct NvUsages {

    public uint Version;

    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_USAGES_PER_GPU)]

    public uint[] Usage;

  }

  [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 NvGPUCoolerSettings {

    public uint Version;

    public uint Count;

    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NVAPI.MAX_COOLER_PER_GPU)]

    public NvCooler[] Cooler;

  }

  [StructLayout(LayoutKind.Sequential, Pack = 8)]

  internal struct NvMemoryInfo {

    public uint Version;

    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 

      NVAPI.MAX_MEMORY_VALUES_PER_GPU)]

    public uint[] Values;

  }

  [StructLayout(LayoutKind.Sequential, Pack = 8)]

  internal struct NvDisplayDriverVersion {

    public uint Version;

    public uint DriverVersion;

    public uint BldChangeListNum;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = NVAPI.SHORT_STRING_MAX)]

    public string BuildBranch;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = NVAPI.SHORT_STRING_MAX)]

    public string Adapter;

  }

  internal class NVAPI {

    public const int MAX_PHYSICAL_GPUS = 64;

    public const int SHORT_STRING_MAX = 64;

    public const int MAX_THERMAL_SENSORS_PER_GPU = 3;    

    public const int MAX_CLOCKS_PER_GPU = 0x120;

    public const int MAX_PSTATES_PER_GPU = 8;

    public const int MAX_USAGES_PER_GPU = 33;

    public const int MAX_COOLER_PER_GPU = 20;

    public const int MAX_MEMORY_VALUES_PER_GPU = 5;

    public static readonly uint GPU_THERMAL_SETTINGS_VER = (uint)

      Marshal.SizeOf(typeof(NvGPUThermalSettings)) | 0x10000;

    public static readonly uint GPU_CLOCKS_VER = (uint)

      Marshal.SizeOf(typeof(NvClocks)) | 0x20000;

    public static readonly uint GPU_PSTATES_VER = (uint)

      Marshal.SizeOf(typeof(NvPStates)) | 0x10000;

    public static readonly uint GPU_USAGES_VER = (uint)

      Marshal.SizeOf(typeof(NvUsages)) | 0x10000;

    public static readonly uint GPU_COOLER_SETTINGS_VER = (uint)

      Marshal.SizeOf(typeof(NvGPUCoolerSettings)) | 0x20000;

    public static readonly uint GPU_MEMORY_INFO_VER = (uint) 

      Marshal.SizeOf(typeof(NvMemoryInfo)) | 0x20000;

    public static readonly uint DISPLAY_DRIVER_VERSION_VER = (uint)

      Marshal.SizeOf(typeof(NvDisplayDriverVersion)) | 0x10000;

    private delegate IntPtr nvapi_QueryInterfaceDelegate(uint id);

    private delegate NvStatus NvAPI_InitializeDelegate();

    private delegate NvStatus NvAPI_GPU_GetFullNameDelegate(

      NvPhysicalGpuHandle gpuHandle, StringBuilder name);

    public delegate NvStatus NvAPI_GPU_GetThermalSettingsDelegate(

      NvPhysicalGpuHandle gpuHandle, int sensorIndex, 

      ref NvGPUThermalSettings nvGPUThermalSettings);

    public delegate NvStatus NvAPI_EnumNvidiaDisplayHandleDelegate(int thisEnum,

      ref NvDisplayHandle displayHandle);

    public delegate NvStatus NvAPI_GetPhysicalGPUsFromDisplayDelegate(

      NvDisplayHandle displayHandle, [Out] NvPhysicalGpuHandle[] gpuHandles, 

      out uint gpuCount);

    public delegate NvStatus NvAPI_EnumPhysicalGPUsDelegate(

      [Out] NvPhysicalGpuHandle[] gpuHandles, out int gpuCount);

    public delegate NvStatus NvAPI_GPU_GetTachReadingDelegate(

      NvPhysicalGpuHandle gpuHandle, out int value);

    public delegate NvStatus NvAPI_GPU_GetAllClocksDelegate(

      NvPhysicalGpuHandle gpuHandle, ref NvClocks nvClocks);

    public delegate NvStatus NvAPI_GPU_GetPStatesDelegate(

      NvPhysicalGpuHandle gpuHandle, ref NvPStates nvPStates);

    public delegate NvStatus NvAPI_GPU_GetUsagesDelegate(

      NvPhysicalGpuHandle gpuHandle, ref NvUsages nvUsages);

    public delegate NvStatus NvAPI_GPU_GetCoolerSettingsDelegate(

      NvPhysicalGpuHandle gpuHandle, int coolerIndex,

      ref NvGPUCoolerSettings nvGPUCoolerSettings);

    public delegate NvStatus NvAPI_GPU_GetMemoryInfoDelegate(

      NvDisplayHandle displayHandle, ref NvMemoryInfo nvMemoryInfo);

    public delegate NvStatus NvAPI_GetDisplayDriverVersionDelegate(

      NvDisplayHandle displayHandle, [In, Out] ref NvDisplayDriverVersion

      nvDisplayDriverVersion);

    public delegate NvStatus NvAPI_GetInterfaceVersionStringDelegate(

      StringBuilder version);

    private static readonly bool available;

    private static readonly nvapi_QueryInterfaceDelegate nvapi_QueryInterface;

    private static readonly NvAPI_InitializeDelegate NvAPI_Initialize;

    private static readonly NvAPI_GPU_GetFullNameDelegate 

      _NvAPI_GPU_GetFullName;

    private static readonly NvAPI_GetInterfaceVersionStringDelegate

      _NvAPI_GetInterfaceVersionString;

    public static readonly NvAPI_GPU_GetThermalSettingsDelegate 

      NvAPI_GPU_GetThermalSettings;

    public static readonly NvAPI_EnumNvidiaDisplayHandleDelegate

      NvAPI_EnumNvidiaDisplayHandle;

    public static readonly NvAPI_GetPhysicalGPUsFromDisplayDelegate

      NvAPI_GetPhysicalGPUsFromDisplay;

    public static readonly NvAPI_EnumPhysicalGPUsDelegate

      NvAPI_EnumPhysicalGPUs;

    public static readonly NvAPI_GPU_GetTachReadingDelegate

      NvAPI_GPU_GetTachReading;

    public static readonly NvAPI_GPU_GetAllClocksDelegate

      NvAPI_GPU_GetAllClocks;

    public static readonly NvAPI_GPU_GetPStatesDelegate

      NvAPI_GPU_GetPStates;

    public static readonly NvAPI_GPU_GetUsagesDelegate

      NvAPI_GPU_GetUsages;

    public static readonly NvAPI_GPU_GetCoolerSettingsDelegate

      NvAPI_GPU_GetCoolerSettings;

    public static readonly NvAPI_GPU_GetMemoryInfoDelegate

      NvAPI_GPU_GetMemoryInfo;

    public static readonly NvAPI_GetDisplayDriverVersionDelegate

      NvAPI_GetDisplayDriverVersion;

    private NVAPI() { }

    public static NvStatus NvAPI_GPU_GetFullName(NvPhysicalGpuHandle gpuHandle,

      out string name) {

      StringBuilder builder = new StringBuilder(SHORT_STRING_MAX);

      NvStatus status;

      if (_NvAPI_GPU_GetFullName != null)

        status = _NvAPI_GPU_GetFullName(gpuHandle, builder);

      else

        status = NvStatus.FUNCTION_NOT_FOUND;

      name = builder.ToString();

      return status;

    }

    public static NvStatus NvAPI_GetInterfaceVersionString(out string version) {

      StringBuilder builder = new StringBuilder(SHORT_STRING_MAX);

      NvStatus status;

      if (_NvAPI_GetInterfaceVersionString != null)

        status = _NvAPI_GetInterfaceVersionString(builder);

      else

        status = NvStatus.FUNCTION_NOT_FOUND;

      version = builder.ToString();

      return status;

    }

    private static string GetDllName() {

      if (IntPtr.Size == 4) {

        return "nvapi.dll";

      } else {

        return "nvapi64.dll";

      }

    }

    private static void GetDelegate<T>(uint id, out T newDelegate) 

      where T : class 

    {

      IntPtr ptr = nvapi_QueryInterface(id);

      if (ptr != IntPtr.Zero) {

        newDelegate =

          Marshal.GetDelegateForFunctionPointer(ptr, typeof(T)) as T;

      } else {

        newDelegate = null;

      }

    }

    static NVAPI() { 

      DllImportAttribute attribute = new DllImportAttribute(GetDllName());

      attribute.CallingConvention = CallingConvention.Cdecl;

      attribute.PreserveSig = true;

      attribute.EntryPoint = "nvapi_QueryInterface";

      PInvokeDelegateFactory.CreateDelegate(attribute,

        out nvapi_QueryInterface);

      try {

        GetDelegate(0x0150E828, out NvAPI_Initialize);

      } catch (DllNotFoundException) { return; } 

        catch (EntryPointNotFoundException) { return; } 

        catch (ArgumentNullException) { return; }

      if (NvAPI_Initialize() == 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_GetPStates);

        GetDelegate(0x189A1FDF, out NvAPI_GPU_GetUsages);

        GetDelegate(0xDA141340, out NvAPI_GPU_GetCoolerSettings);

        GetDelegate(0x774AA982, out NvAPI_GPU_GetMemoryInfo);

        GetDelegate(0xF951A4D1, out NvAPI_GetDisplayDriverVersion);

        GetDelegate(0x01053FA5, out _NvAPI_GetInterfaceVersionString);

        available = true;

      }

    }

    public static bool IsAvailable {

      get { return available; }

    }

  }

}