text: //========================================================================
  // GLFW 3.4 Win32 - www.glfw.org
  //------------------------------------------------------------------------
  // Copyright (c) 2002-2006 Marcus Geelnard
  // Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.org>
  //
  // This software is provided 'as-is', without any express or implied
  // warranty. In no event will the authors be held liable for any damages
  // arising from the use of this software.
  //
  // Permission is granted to anyone to use this software for any purpose,
  // including commercial applications, and to alter it and redistribute it
  // freely, subject to the following restrictions:
  //
  // 1. The origin of this software must not be misrepresented; you must not
  //    claim that you wrote the original software. If you use this software
  //    in a product, an acknowledgment in the product documentation would
  //    be appreciated but is not required.
  //
  // 2. Altered source versions must be plainly marked as such, and must not
  //    be misrepresented as being the original software.
  //
  // 3. This notice may not be removed or altered from any source
  //    distribution.
  //
  //========================================================================
  // Please use C89 style variable declarations in this file because VS 2010
  //========================================================================
  
  #include "internal.h"
  
  #include <stdlib.h>
  #include <malloc.h>
  
  static const GUID _glfw_GUID_DEVINTERFACE_HID =
      {0x4d1e55b2,0xf16f,0x11cf,{0x88,0xcb,0x00,0x11,0x11,0x00,0x00,0x30}};
  
  #define GUID_DEVINTERFACE_HID _glfw_GUID_DEVINTERFACE_HID
  
  #if defined(_GLFW_USE_HYBRID_HPG) || defined(_GLFW_USE_OPTIMUS_HPG)
  
  #if defined(_GLFW_BUILD_DLL)
   #warning "These symbols must be exported by the executable and have no effect in a DLL"
  #endif
  
  // Executables (but not DLLs) exporting this symbol with this value will be
  // automatically directed to the high-performance GPU on Nvidia Optimus systems
  // with up-to-date drivers
  //
  __declspec(dllexport) DWORD NvOptimusEnablement = 1;
  
  // Executables (but not DLLs) exporting this symbol with this value will be
  // automatically directed to the high-performance GPU on AMD PowerXpress systems
  // with up-to-date drivers
  //
  __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
  
  #endif // _GLFW_USE_HYBRID_HPG
  
  #if defined(_GLFW_BUILD_DLL)
  
  // GLFW DLL entry point
  //
  BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
  {
      return TRUE;
  }
  
  #endif // _GLFW_BUILD_DLL
  
  // Load necessary libraries (DLLs)
  //
  static GLFWbool loadLibraries(void)
  {
      _glfw.win32.winmm.instance = LoadLibraryA("winmm.dll");
      if (!_glfw.win32.winmm.instance)
      {
          _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                               "Win32: Failed to load winmm.dll");
          return GLFW_FALSE;
      }
  
      _glfw.win32.winmm.GetTime = (PFN_timeGetTime)
          GetProcAddress(_glfw.win32.winmm.instance, "timeGetTime");
  
      _glfw.win32.user32.instance = LoadLibraryA("user32.dll");
      if (!_glfw.win32.user32.instance)
      {
          _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                               "Win32: Failed to load user32.dll");
          return GLFW_FALSE;
      }
  
      _glfw.win32.user32.SetProcessDPIAware_ = (PFN_SetProcessDPIAware)
          GetProcAddress(_glfw.win32.user32.instance, "SetProcessDPIAware");
      _glfw.win32.user32.ChangeWindowMessageFilterEx_ = (PFN_ChangeWindowMessageFilterEx)
          GetProcAddress(_glfw.win32.user32.instance, "ChangeWindowMessageFilterEx");
      _glfw.win32.user32.EnableNonClientDpiScaling_ = (PFN_EnableNonClientDpiScaling)
          GetProcAddress(_glfw.win32.user32.instance, "EnableNonClientDpiScaling");
      _glfw.win32.user32.SetProcessDpiAwarenessContext_ = (PFN_SetProcessDpiAwarenessContext)
          GetProcAddress(_glfw.win32.user32.instance, "SetProcessDpiAwarenessContext");
      _glfw.win32.user32.GetDpiForWindow_ = (PFN_GetDpiForWindow)
          GetProcAddress(_glfw.win32.user32.instance, "GetDpiForWindow");
      _glfw.win32.user32.AdjustWindowRectExForDpi_ = (PFN_AdjustWindowRectExForDpi)
          GetProcAddress(_glfw.win32.user32.instance, "AdjustWindowRectExForDpi");
  
      _glfw.win32.dinput8.instance = LoadLibraryA("dinput8.dll");
      if (_glfw.win32.dinput8.instance)
      {
          _glfw.win32.dinput8.Create = (PFN_DirectInput8Create)
              GetProcAddress(_glfw.win32.dinput8.instance, "DirectInput8Create");
      }
  
      {
          int i;
          const char* names[] =
          {
              "xinput1_4.dll",
              "xinput1_3.dll",
              "xinput9_1_0.dll",
              "xinput1_2.dll",
              "xinput1_1.dll",
              NULL
          };
  
          for (i = 0;  names[i];  i++)
          {
              _glfw.win32.xinput.instance = LoadLibraryA(names[i]);
              if (_glfw.win32.xinput.instance)
              {
                  _glfw.win32.xinput.GetCapabilities = (PFN_XInputGetCapabilities)
                      GetProcAddress(_glfw.win32.xinput.instance, "XInputGetCapabilities");
                  _glfw.win32.xinput.GetState = (PFN_XInputGetState)
                      GetProcAddress(_glfw.win32.xinput.instance, "XInputGetState");
  
                  break;
              }
          }
      }
  
      _glfw.win32.dwmapi.instance = LoadLibraryA("dwmapi.dll");
      if (_glfw.win32.dwmapi.instance)
      {
          _glfw.win32.dwmapi.IsCompositionEnabled = (PFN_DwmIsCompositionEnabled)
              GetProcAddress(_glfw.win32.dwmapi.instance, "DwmIsCompositionEnabled");
          _glfw.win32.dwmapi.Flush = (PFN_DwmFlush)
              GetProcAddress(_glfw.win32.dwmapi.instance, "DwmFlush");
          _glfw.win32.dwmapi.EnableBlurBehindWindow = (PFN_DwmEnableBlurBehindWindow)
              GetProcAddress(_glfw.win32.dwmapi.instance, "DwmEnableBlurBehindWindow");
          _glfw.win32.dwmapi.GetColorizationColor = (PFN_DwmGetColorizationColor)
              GetProcAddress(_glfw.win32.dwmapi.instance, "DwmGetColorizationColor");
      }
  
      _glfw.win32.shcore.instance = LoadLibraryA("shcore.dll");
      if (_glfw.win32.shcore.instance)
      {
          _glfw.win32.shcore.SetProcessDpiAwareness_ = (PFN_SetProcessDpiAwareness)
              GetProcAddress(_glfw.win32.shcore.instance, "SetProcessDpiAwareness");
          _glfw.win32.shcore.GetDpiForMonitor_ = (PFN_GetDpiForMonitor)
              GetProcAddress(_glfw.win32.shcore.instance, "GetDpiForMonitor");
      }
  
      _glfw.win32.ntdll.instance = LoadLibraryA("ntdll.dll");
      if (_glfw.win32.ntdll.instance)
      {
          _glfw.win32.ntdll.RtlVerifyVersionInfo_ = (PFN_RtlVerifyVersionInfo)
              GetProcAddress(_glfw.win32.ntdll.instance, "RtlVerifyVersionInfo");
      }
  
      return GLFW_TRUE;
  }
  
  // Unload used libraries (DLLs)
  //
  static void freeLibraries(void)
  {
      if (_glfw.win32.xinput.instance)
          FreeLibrary(_glfw.win32.xinput.instance);
  
      if (_glfw.win32.dinput8.instance)
          FreeLibrary(_glfw.win32.dinput8.instance);
  
      if (_glfw.win32.winmm.instance)
          FreeLibrary(_glfw.win32.winmm.instance);
  
      if (_glfw.win32.user32.instance)
          FreeLibrary(_glfw.win32.user32.instance);
  
      if (_glfw.win32.dwmapi.instance)
          FreeLibrary(_glfw.win32.dwmapi.instance);
  
      if (_glfw.win32.shcore.instance)
          FreeLibrary(_glfw.win32.shcore.instance);
  
      if (_glfw.win32.ntdll.instance)
          FreeLibrary(_glfw.win32.ntdll.instance);
  }
  
  // Create key code translation tables
  //
  static void createKeyTables(void)
  {
      int scancode;
  
      memset(_glfw.win32.keycodes, -1, sizeof(_glfw.win32.keycodes));
      memset(_glfw.win32.scancodes, -1, sizeof(_glfw.win32.scancodes));
  
      _glfw.win32.keycodes[0x00B] = GLFW_KEY_0;
      _glfw.win32.keycodes[0x002] = GLFW_KEY_1;
      _glfw.win32.keycodes[0x003] = GLFW_KEY_2;
      _glfw.win32.keycodes[0x004] = GLFW_KEY_3;
      _glfw.win32.keycodes[0x005] = GLFW_KEY_4;
      _glfw.win32.keycodes[0x006] = GLFW_KEY_5;
      _glfw.win32.keycodes[0x007] = GLFW_KEY_6;
      _glfw.win32.keycodes[0x008] = GLFW_KEY_7;
      _glfw.win32.keycodes[0x009] = GLFW_KEY_8;
      _glfw.win32.keycodes[0x00A] = GLFW_KEY_9;
      _glfw.win32.keycodes[0x01E] = GLFW_KEY_A;
      _glfw.win32.keycodes[0x030] = GLFW_KEY_B;
      _glfw.win32.keycodes[0x02E] = GLFW_KEY_C;
      _glfw.win32.keycodes[0x020] = GLFW_KEY_D;
      _glfw.win32.keycodes[0x012] = GLFW_KEY_E;
      _glfw.win32.keycodes[0x021] = GLFW_KEY_F;
      _glfw.win32.keycodes[0x022] = GLFW_KEY_G;
      _glfw.win32.keycodes[0x023] = GLFW_KEY_H;
      _glfw.win32.keycodes[0x017] = GLFW_KEY_I;
      _glfw.win32.keycodes[0x024] = GLFW_KEY_J;
      _glfw.win32.keycodes[0x025] = GLFW_KEY_K;
      _glfw.win32.keycodes[0x026] = GLFW_KEY_L;
      _glfw.win32.keycodes[0x032] = GLFW_KEY_M;
      _glfw.win32.keycodes[0x031] = GLFW_KEY_N;
      _glfw.win32.keycodes[0x018] = GLFW_KEY_O;
      _glfw.win32.keycodes[0x019] = GLFW_KEY_P;
      _glfw.win32.keycodes[0x010] = GLFW_KEY_Q;
      _glfw.win32.keycodes[0x013] = GLFW_KEY_R;
      _glfw.win32.keycodes[0x01F] = GLFW_KEY_S;
      _glfw.win32.keycodes[0x014] = GLFW_KEY_T;
      _glfw.win32.keycodes[0x016] = GLFW_KEY_U;
      _glfw.win32.keycodes[0x02F] = GLFW_KEY_V;
      _glfw.win32.keycodes[0x011] = GLFW_KEY_W;
      _glfw.win32.keycodes[0x02D] = GLFW_KEY_X;
      _glfw.win32.keycodes[0x015] = GLFW_KEY_Y;
      _glfw.win32.keycodes[0x02C] = GLFW_KEY_Z;
  
      _glfw.win32.keycodes[0x028] = GLFW_KEY_APOSTROPHE;
      _glfw.win32.keycodes[0x02B] = GLFW_KEY_BACKSLASH;
      _glfw.win32.keycodes[0x033] = GLFW_KEY_COMMA;
      _glfw.win32.keycodes[0x00D] = GLFW_KEY_EQUAL;
      _glfw.win32.keycodes[0x029] = GLFW_KEY_GRAVE_ACCENT;
      _glfw.win32.keycodes[0x01A] = GLFW_KEY_LEFT_BRACKET;
      _glfw.win32.keycodes[0x00C] = GLFW_KEY_MINUS;
      _glfw.win32.keycodes[0x034] = GLFW_KEY_PERIOD;
      _glfw.win32.keycodes[0x01B] = GLFW_KEY_RIGHT_BRACKET;
      _glfw.win32.keycodes[0x027] = GLFW_KEY_SEMICOLON;
      _glfw.win32.keycodes[0x035] = GLFW_KEY_SLASH;
      _glfw.win32.keycodes[0x056] = GLFW_KEY_WORLD_2;
  
      _glfw.win32.keycodes[0x00E] = GLFW_KEY_BACKSPACE;
      _glfw.win32.keycodes[0x153] = GLFW_KEY_DELETE;
      _glfw.win32.keycodes[0x14F] = GLFW_KEY_END;
      _glfw.win32.keycodes[0x01C] = GLFW_KEY_ENTER;
      _glfw.win32.keycodes[0x001] = GLFW_KEY_ESCAPE;
      _glfw.win32.keycodes[0x147] = GLFW_KEY_HOME;
      _glfw.win32.keycodes[0x152] = GLFW_KEY_INSERT;
      _glfw.win32.keycodes[0x15D] = GLFW_KEY_MENU;
      _glfw.win32.keycodes[0x151] = GLFW_KEY_PAGE_DOWN;
      _glfw.win32.keycodes[0x149] = GLFW_KEY_PAGE_UP;
      _glfw.win32.keycodes[0x045] = GLFW_KEY_PAUSE;
      _glfw.win32.keycodes[0x146] = GLFW_KEY_PAUSE;
      _glfw.win32.keycodes[0x039] = GLFW_KEY_SPACE;
      _glfw.win32.keycodes[0x00F] = GLFW_KEY_TAB;
      _glfw.win32.keycodes[0x03A] = GLFW_KEY_CAPS_LOCK;
      _glfw.win32.keycodes[0x145] = GLFW_KEY_NUM_LOCK;
      _glfw.win32.keycodes[0x046] = GLFW_KEY_SCROLL_LOCK;
      _glfw.win32.keycodes[0x03B] = GLFW_KEY_F1;
      _glfw.win32.keycodes[0x03C] = GLFW_KEY_F2;
      _glfw.win32.keycodes[0x03D] = GLFW_KEY_F3;
      _glfw.win32.keycodes[0x03E] = GLFW_KEY_F4;
      _glfw.win32.keycodes[0x03F] = GLFW_KEY_F5;
      _glfw.win32.keycodes[0x040] = GLFW_KEY_F6;
      _glfw.win32.keycodes[0x041] = GLFW_KEY_F7;
      _glfw.win32.keycodes[0x042] = GLFW_KEY_F8;
      _glfw.win32.keycodes[0x043] = GLFW_KEY_F9;
      _glfw.win32.keycodes[0x044] = GLFW_KEY_F10;
      _glfw.win32.keycodes[0x057] = GLFW_KEY_F11;
      _glfw.win32.keycodes[0x058] = GLFW_KEY_F12;
      _glfw.win32.keycodes[0x064] = GLFW_KEY_F13;
      _glfw.win32.keycodes[0x065] = GLFW_KEY_F14;
      _glfw.win32.keycodes[0x066] = GLFW_KEY_F15;
      _glfw.win32.keycodes[0x067] = GLFW_KEY_F16;
      _glfw.win32.keycodes[0x068] = GLFW_KEY_F17;
      _glfw.win32.keycodes[0x069] = GLFW_KEY_F18;
      _glfw.win32.keycodes[0x06A] = GLFW_KEY_F19;
      _glfw.win32.keycodes[0x06B] = GLFW_KEY_F20;
      _glfw.win32.keycodes[0x06C] = GLFW_KEY_F21;
      _glfw.win32.keycodes[0x06D] = GLFW_KEY_F22;
      _glfw.win32.keycodes[0x06E] = GLFW_KEY_F23;
      _glfw.win32.keycodes[0x076] = GLFW_KEY_F24;
      _glfw.win32.keycodes[0x038] = GLFW_KEY_LEFT_ALT;
      _glfw.win32.keycodes[0x01D] = GLFW_KEY_LEFT_CONTROL;
      _glfw.win32.keycodes[0x02A] = GLFW_KEY_LEFT_SHIFT;
      _glfw.win32.keycodes[0x15B] = GLFW_KEY_LEFT_SUPER;
      _glfw.win32.keycodes[0x137] = GLFW_KEY_PRINT_SCREEN;
      _glfw.win32.keycodes[0x138] = GLFW_KEY_RIGHT_ALT;
      _glfw.win32.keycodes[0x11D] = GLFW_KEY_RIGHT_CONTROL;
      _glfw.win32.keycodes[0x036] = GLFW_KEY_RIGHT_SHIFT;
      _glfw.win32.keycodes[0x15C] = GLFW_KEY_RIGHT_SUPER;
      _glfw.win32.keycodes[0x150] = GLFW_KEY_DOWN;
      _glfw.win32.keycodes[0x14B] = GLFW_KEY_LEFT;
      _glfw.win32.keycodes[0x14D] = GLFW_KEY_RIGHT;
      _glfw.win32.keycodes[0x148] = GLFW_KEY_UP;
  
      _glfw.win32.keycodes[0x052] = GLFW_KEY_KP_0;
      _glfw.win32.keycodes[0x04F] = GLFW_KEY_KP_1;
      _glfw.win32.keycodes[0x050] = GLFW_KEY_KP_2;
      _glfw.win32.keycodes[0x051] = GLFW_KEY_KP_3;
      _glfw.win32.keycodes[0x04B] = GLFW_KEY_KP_4;
      _glfw.win32.keycodes[0x04C] = GLFW_KEY_KP_5;
      _glfw.win32.keycodes[0x04D] = GLFW_KEY_KP_6;
      _glfw.win32.keycodes[0x047] = GLFW_KEY_KP_7;
      _glfw.win32.keycodes[0x048] = GLFW_KEY_KP_8;
      _glfw.win32.keycodes[0x049] = GLFW_KEY_KP_9;
      _glfw.win32.keycodes[0x04E] = GLFW_KEY_KP_ADD;
      _glfw.win32.keycodes[0x053] = GLFW_KEY_KP_DECIMAL;
      _glfw.win32.keycodes[0x135] = GLFW_KEY_KP_DIVIDE;
      _glfw.win32.keycodes[0x11C] = GLFW_KEY_KP_ENTER;
      _glfw.win32.keycodes[0x059] = GLFW_KEY_KP_EQUAL;
      _glfw.win32.keycodes[0x037] = GLFW_KEY_KP_MULTIPLY;
      _glfw.win32.keycodes[0x04A] = GLFW_KEY_KP_SUBTRACT;
  
      for (scancode = 0;  scancode < 512;  scancode++)
      {
          if (_glfw.win32.keycodes[scancode] > 0)
              _glfw.win32.scancodes[_glfw.win32.keycodes[scancode]] = scancode;
      }
  }
  
  // Creates a dummy window for behind-the-scenes work
  //
  static GLFWbool createHelperWindow(void)
  {
      MSG msg;
  
      _glfw.win32.helperWindowHandle =
          CreateWindowExW(WS_EX_OVERLAPPEDWINDOW,
                          _GLFW_WNDCLASSNAME,
                          L"GLFW message window",
                          WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
                          0, 0, 1, 1,
                          NULL, NULL,
                          GetModuleHandleW(NULL),
                          NULL);
  
      if (!_glfw.win32.helperWindowHandle)
      {
          _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                               "Win32: Failed to create helper window");
          return GLFW_FALSE;
      }
  
      // HACK: The command to the first ShowWindow call is ignored if the parent
      //       process passed along a STARTUPINFO, so clear that with a no-op call
      ShowWindow(_glfw.win32.helperWindowHandle, SW_HIDE);
  
      // Register for HID device notifications
      {
          DEV_BROADCAST_DEVICEINTERFACE_W dbi;
          ZeroMemory(&dbi, sizeof(dbi));
          dbi.dbcc_size = sizeof(dbi);
          dbi.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
          dbi.dbcc_classguid = GUID_DEVINTERFACE_HID;
  
          _glfw.win32.deviceNotificationHandle =
              RegisterDeviceNotificationW(_glfw.win32.helperWindowHandle,
                                          (DEV_BROADCAST_HDR*) &dbi,
                                          DEVICE_NOTIFY_WINDOW_HANDLE);
      }
  
      while (PeekMessageW(&msg, _glfw.win32.helperWindowHandle, 0, 0, PM_REMOVE))
      {
          TranslateMessage(&msg);
          DispatchMessageW(&msg);
      }
  
     return GLFW_TRUE;
  }
  
  
  //////////////////////////////////////////////////////////////////////////
  //////                       GLFW internal API                      //////
  //////////////////////////////////////////////////////////////////////////
  
  // Returns a wide string version of the specified UTF-8 string
  //
  WCHAR* _glfwCreateWideStringFromUTF8Win32(const char* source)
  {
      WCHAR* target;
      int count;
  
      count = MultiByteToWideChar(CP_UTF8, 0, source, -1, NULL, 0);
      if (!count)
      {
          _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                               "Win32: Failed to convert string from UTF-8");
          return NULL;
      }
  
      target = calloc(count, sizeof(WCHAR));
  
      if (!MultiByteToWideChar(CP_UTF8, 0, source, -1, target, count))
      {
          _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                               "Win32: Failed to convert string from UTF-8");
          free(target);
          return NULL;
      }
  
      return target;
  }
  
  // Returns a UTF-8 string version of the specified wide string
  //
  char* _glfwCreateUTF8FromWideStringWin32(const WCHAR* source)
  {
      char* target;
      int size;
  
      size = WideCharToMultiByte(CP_UTF8, 0, source, -1, NULL, 0, NULL, NULL);
      if (!size)
      {
          _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                               "Win32: Failed to convert string to UTF-8");
          return NULL;
      }
  
      target = calloc(size, 1);
  
      if (!WideCharToMultiByte(CP_UTF8, 0, source, -1, target, size, NULL, NULL))
      {
          _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                               "Win32: Failed to convert string to UTF-8");
          free(target);
          return NULL;
      }
  
      return target;
  }
  
  // Reports the specified error, appending information about the last Win32 error
  //
  void _glfwInputErrorWin32(int error, const char* description)
  {
      WCHAR buffer[_GLFW_MESSAGE_SIZE] = L"";
      char message[_GLFW_MESSAGE_SIZE] = "";
  
      FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
                         FORMAT_MESSAGE_IGNORE_INSERTS |
                         FORMAT_MESSAGE_MAX_WIDTH_MASK,
                     NULL,
                     GetLastError() & 0xffff,
                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                     buffer,
                     sizeof(buffer) / sizeof(WCHAR),
                     NULL);
      WideCharToMultiByte(CP_UTF8, 0, buffer, -1, message, sizeof(message), NULL, NULL);
  
      _glfwInputError(error, "%s: %s", description, message);
  }
  
  // Updates key names according to the current keyboard layout
  //
  void _glfwUpdateKeyNamesWin32(void)
  {
      int key;
      BYTE state[256] = {0};
  
      memset(_glfw.win32.keynames, 0, sizeof(_glfw.win32.keynames));
  
      for (key = GLFW_KEY_SPACE;  key <= GLFW_KEY_LAST;  key++)
      {
          UINT vk;
          int scancode, length;
          WCHAR chars[16];
  
          scancode = _glfw.win32.scancodes[key];
          if (scancode == -1)
              continue;
  
          if (key >= GLFW_KEY_KP_0 && key <= GLFW_KEY_KP_ADD)
          {
              const UINT vks[] = {
                  VK_NUMPAD0,  VK_NUMPAD1,  VK_NUMPAD2, VK_NUMPAD3,
                  VK_NUMPAD4,  VK_NUMPAD5,  VK_NUMPAD6, VK_NUMPAD7,
                  VK_NUMPAD8,  VK_NUMPAD9,  VK_DECIMAL, VK_DIVIDE,
                  VK_MULTIPLY, VK_SUBTRACT, VK_ADD
              };
  
              vk = vks[key - GLFW_KEY_KP_0];
          }
          else
              vk = MapVirtualKey(scancode, MAPVK_VSC_TO_VK);
  
          length = ToUnicode(vk, scancode, state,
                             chars, sizeof(chars) / sizeof(WCHAR),
                             0);
  
          if (length == -1)
          {
              length = ToUnicode(vk, scancode, state,
                                 chars, sizeof(chars) / sizeof(WCHAR),
                                 0);
          }
  
          if (length < 1)
              continue;
  
          WideCharToMultiByte(CP_UTF8, 0, chars, 1,
                              _glfw.win32.keynames[key],
                              sizeof(_glfw.win32.keynames[key]),
                              NULL, NULL);
      }
  }
  
  // Replacement for IsWindowsVersionOrGreater as MinGW lacks versionhelpers.h
  //
  BOOL _glfwIsWindowsVersionOrGreaterWin32(WORD major, WORD minor, WORD sp)
  {
      OSVERSIONINFOEXW osvi = { sizeof(osvi), major, minor, 0, 0, {0}, sp };
      DWORD mask = VER_MAJORVERSION | VER_MINORVERSION | VER_SERVICEPACKMAJOR;
      ULONGLONG cond = VerSetConditionMask(0, VER_MAJORVERSION, VER_GREATER_EQUAL);
      cond = VerSetConditionMask(cond, VER_MINORVERSION, VER_GREATER_EQUAL);
      cond = VerSetConditionMask(cond, VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL);
      // HACK: Use RtlVerifyVersionInfo instead of VerifyVersionInfoW as the
      //       latter lies unless the user knew to embed a non-default manifest
      //       announcing support for Windows 10 via supportedOS GUID
      return RtlVerifyVersionInfo(&osvi, mask, cond) == 0;
  }
  
  // Checks whether we are on at least the specified build of Windows 10
  //
  BOOL _glfwIsWindows10BuildOrGreaterWin32(WORD build)
  {
      OSVERSIONINFOEXW osvi = { sizeof(osvi), 10, 0, build };
      DWORD mask = VER_MAJORVERSION | VER_MINORVERSION | VER_BUILDNUMBER;
      ULONGLONG cond = VerSetConditionMask(0, VER_MAJORVERSION, VER_GREATER_EQUAL);
      cond = VerSetConditionMask(cond, VER_MINORVERSION, VER_GREATER_EQUAL);
      cond = VerSetConditionMask(cond, VER_BUILDNUMBER, VER_GREATER_EQUAL);
      // HACK: Use RtlVerifyVersionInfo instead of VerifyVersionInfoW as the
      //       latter lies unless the user knew to embed a non-default manifest
      //       announcing support for Windows 10 via supportedOS GUID
      return RtlVerifyVersionInfo(&osvi, mask, cond) == 0;
  }
  
  
  //////////////////////////////////////////////////////////////////////////
  //////                       GLFW platform API                      //////
  //////////////////////////////////////////////////////////////////////////
  
  int _glfwPlatformInit(void)
  {
      if (!loadLibraries())
          return GLFW_FALSE;
  
      createKeyTables();
      _glfwUpdateKeyNamesWin32();
  
      if (_glfwIsWindows10CreatorsUpdateOrGreaterWin32())
          SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
      else if (IsWindows8Point1OrGreater())
          SetProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE);
      else if (IsWindowsVistaOrGreater())
          SetProcessDPIAware();
  
      if (!_glfwRegisterWindowClassWin32())
          return GLFW_FALSE;
  
      if (!createHelperWindow())
          return GLFW_FALSE;
  
      _glfwInitTimerWin32();
  
      _glfwPollMonitorsWin32();
      return GLFW_TRUE;
  }
  
  void _glfwPlatformTerminate(void)
  {
      if (_glfw.win32.deviceNotificationHandle)
          UnregisterDeviceNotification(_glfw.win32.deviceNotificationHandle);
  
      if (_glfw.win32.helperWindowHandle)
          DestroyWindow(_glfw.win32.helperWindowHandle);
  
      _glfwUnregisterWindowClassWin32();
  
      free(_glfw.win32.clipboardString);
      free(_glfw.win32.rawInput);
  
      _glfwTerminateWGL();
      _glfwTerminateEGL();
  
      freeLibraries();
  }
  
  const char* _glfwPlatformGetVersionString(void)
  {
      return _GLFW_VERSION_NUMBER " Win32 WGL EGL OSMesa"
  #if defined(__MINGW64_VERSION_MAJOR)
          " MinGW-w64"
  #elif defined(__MINGW32__)
          " MinGW"
  #elif defined(_MSC_VER)
          " VisualC"
  #endif
  #if defined(_GLFW_USE_HYBRID_HPG) || defined(_GLFW_USE_OPTIMUS_HPG)
          " hybrid-GPU"
  #endif
  #if defined(_GLFW_BUILD_DLL)
          " DLL"
  #endif
          ;
  }
  
  