RetroArch/frontend/drivers/platform_win32.c

/* RetroArch - A frontend for libretro.
 * Copyright (C) 2011-2017 - Daniel De Matteis
 * Copyright (C) 2016-2019 - Brad Parker
 * Copyright (C) 2018-2019 - Andrés Suárez
 *
 * RetroArch is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Found-
 * ation, either version 3 of the License, or (at your option) any later version.
 *
 * RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with RetroArch.
 * If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdint.h>
#include <stddef.h>
#include <string.h>

#include <retro_miscellaneous.h>
#include <windows.h>
#if defined(_WIN32) && !defined(_XBOX)
#include <process.h>
#include <errno.h>
#endif

#include <boolean.h>
#include <compat/strl.h>
#include <dynamic/dylib.h>
#include <lists/file_list.h>
#include <file/file_path.h>
#include <string/stdstring.h>
#include <encodings/utf.h>
#include <features/features_cpu.h>

#ifdef HAVE_CONFIG_H
#include "../../config.h"
#endif

#ifdef HAVE_MENU
#include "../../menu/menu_driver.h"
#endif

#include "../frontend_driver.h"
#include "../../configuration.h"
#include "../../defaults.h"
#include "../../verbosity.h"
#include "../../ui/drivers/ui_win32.h"
#include "../../paths.h"
#include "../../msg_hash.h"
#include "platform_win32.h"

#include "../../verbosity.h"

/*
#ifdef HAVE_NVDA
#include "../../nvda_controller.h"
#endif
*/

#ifdef HAVE_SAPI
#define COBJMACROS
#include <sapi.h>
#include <ole2.h>
#endif

#ifdef HAVE_SAPI
static ISpVoice* pVoice        = NULL;
#endif
#ifdef HAVE_NVDA
static bool USE_POWERSHELL     = false;
static bool USE_NVDA           = true;
#else
static bool USE_POWERSHELL     = true;
static bool USE_NVDA           = false;
#endif
static bool USE_NVDA_BRAILLE   = false;

#ifndef SM_SERVERR2
#define SM_SERVERR2 89
#endif

/* static public global variable */
VOID (WINAPI *DragAcceptFiles_func)(HWND, BOOL);

/* TODO/FIXME - static global variables */
static bool dwm_composition_disabled = false;
static bool console_needs_free       = false;
static char win32_cpu_model_name[64] = {0};
static bool pi_set                   = false;
#ifdef HAVE_DYNAMIC
/* We only load this library once, so we let it be
 * unloaded at application shutdown, since unloading
 * it early seems to cause issues on some systems.
 */
static dylib_t dwmlib;
static dylib_t shell32lib;
static dylib_t nvdalib;
#endif

/* Dynamic loading for Non-Visual Desktop Access support */
unsigned long (__stdcall *nvdaController_testIfRunning_func)(void);
unsigned long (__stdcall *nvdaController_cancelSpeech_func)(void);
unsigned long (__stdcall *nvdaController_brailleMessage_func)(wchar_t*);
unsigned long (__stdcall *nvdaController_speakText_func)(wchar_t*);

#if defined(HAVE_LANGEXTRA) && !defined(_XBOX)
#if (defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500) || !defined(_MSC_VER)
struct win32_lang_pair
{
   unsigned short lang_ident;
   enum retro_language lang;
};

/* https://docs.microsoft.com/en-us/windows/desktop/Intl/language-identifier-constants-and-strings */
const struct win32_lang_pair win32_lang_pairs[] =
{
   /* array order MUST be kept, always largest ID first */
   {0x7c04, RETRO_LANGUAGE_CHINESE_TRADITIONAL}, /* neutral */
   {0x1404, RETRO_LANGUAGE_CHINESE_TRADITIONAL}, /* MO */
   {0x1004, RETRO_LANGUAGE_CHINESE_SIMPLIFIED}, /* SG */
   {0xC04, RETRO_LANGUAGE_CHINESE_TRADITIONAL}, /* HK/PRC */
   {0x816, RETRO_LANGUAGE_PORTUGUESE_PORTUGAL},
   {0x416, RETRO_LANGUAGE_PORTUGUESE_BRAZIL},
   {0x2a, RETRO_LANGUAGE_VIETNAMESE},
   {0x19, RETRO_LANGUAGE_RUSSIAN},
   {0x16, RETRO_LANGUAGE_PORTUGUESE_PORTUGAL},
   {0x15, RETRO_LANGUAGE_POLISH},
   {0x13, RETRO_LANGUAGE_DUTCH},
   {0x12, RETRO_LANGUAGE_KOREAN},
   {0x11, RETRO_LANGUAGE_JAPANESE},
   {0x10, RETRO_LANGUAGE_ITALIAN},
   {0xc, RETRO_LANGUAGE_FRENCH},
   {0xa, RETRO_LANGUAGE_SPANISH},
   {0x9, RETRO_LANGUAGE_ENGLISH},
   {0x8, RETRO_LANGUAGE_GREEK},
   {0x7, RETRO_LANGUAGE_GERMAN},
   {0x4, RETRO_LANGUAGE_CHINESE_SIMPLIFIED}, /* neutral */
   {0x1, RETRO_LANGUAGE_ARABIC},
   /* MS does not support Esperanto */
   /*{0x0, RETRO_LANGUAGE_ESPERANTO},*/
};

unsigned short win32_get_langid_from_retro_lang(enum retro_language lang)
{
   unsigned i;

   for (i = 0; i < sizeof(win32_lang_pairs) / sizeof(win32_lang_pairs[0]); i++)
   {
      if (win32_lang_pairs[i].lang == lang)
         return win32_lang_pairs[i].lang_ident;
   }

   return 0x409; /* fallback to US English */
}

enum retro_language win32_get_retro_lang_from_langid(unsigned short langid)
{
   unsigned i;

   for (i = 0; i < sizeof(win32_lang_pairs) / sizeof(win32_lang_pairs[0]); i++)
   {
      if (win32_lang_pairs[i].lang_ident > 0x3ff)
      {
         if (langid == win32_lang_pairs[i].lang_ident)
            return win32_lang_pairs[i].lang;
      }
      else
      {
         if ((langid & 0x3ff) == win32_lang_pairs[i].lang_ident)
            return win32_lang_pairs[i].lang;
      }
   }

   return RETRO_LANGUAGE_ENGLISH;
}
#endif
#else
unsigned short win32_get_langid_from_retro_lang(enum retro_language lang)
{
   return 0x409; /* fallback to US English */
}

enum retro_language win32_get_retro_lang_from_langid(unsigned short langid)
{
   return RETRO_LANGUAGE_ENGLISH;
}
#endif

static void gfx_dwm_shutdown(void)
{
#ifdef HAVE_DYNAMIC
   if (dwmlib)
      dylib_close(dwmlib);
   if (shell32lib)
      dylib_close(shell32lib);
   dwmlib     = NULL;
   shell32lib = NULL;
#endif
}

static bool gfx_init_dwm(void)
{
   HRESULT (WINAPI *mmcss)(BOOL);
   static bool inited = false;

   if (inited)
      return true;

   atexit(gfx_dwm_shutdown);

#ifdef HAVE_DYNAMIC
   shell32lib = dylib_load("shell32.dll");
   if (!shell32lib)
   {
      RARCH_WARN("Did not find shell32.dll.\n");
   }

   dwmlib = dylib_load("dwmapi.dll");
   if (!dwmlib)
   {
      RARCH_WARN("Did not find dwmapi.dll.\n");
      return false;
   }

   DragAcceptFiles_func =
      (VOID (WINAPI*)(HWND, BOOL))dylib_proc(shell32lib, "DragAcceptFiles");

   mmcss =
      (HRESULT(WINAPI*)(BOOL))dylib_proc(dwmlib, "DwmEnableMMCSS");
#else
   DragAcceptFiles_func = DragAcceptFiles;
#if 0
   mmcss                = DwmEnableMMCSS;
#endif
#endif

   if (mmcss)
      mmcss(TRUE);

   inited = true;
   return true;
}

static void gfx_set_dwm(void)
{
   HRESULT ret;
   HRESULT (WINAPI *composition_enable)(UINT);
   settings_t *settings     = config_get_ptr();
   bool disable_composition = settings->bools.video_disable_composition;

   if (!gfx_init_dwm())
      return;

   if (disable_composition == dwm_composition_disabled)
      return;

#ifdef HAVE_DYNAMIC
   composition_enable =
      (HRESULT (WINAPI*)(UINT))dylib_proc(dwmlib, "DwmEnableComposition");
#endif

   if (!composition_enable)
   {
      RARCH_ERR("Did not find DwmEnableComposition ...\n");
      return;
   }

   ret = composition_enable(!disable_composition);
   if (FAILED(ret))
      RARCH_ERR("Failed to set composition state ...\n");
   dwm_composition_disabled = disable_composition;
}

static void frontend_win32_get_os(char *s, size_t len, int *major, int *minor)
{
   char buildStr[11]      = {0};
   bool server            = false;
   const char *arch       = "";

#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500
   /* Windows 2000 and later */
   SYSTEM_INFO si         = {{0}};
   OSVERSIONINFOEX vi     = {0};
   vi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

   GetSystemInfo(&si);

   /* Available from NT 3.5 and Win95 */
   GetVersionEx((OSVERSIONINFO*)&vi);

   server = vi.wProductType != VER_NT_WORKSTATION;

   switch (si.wProcessorArchitecture)
   {
      case PROCESSOR_ARCHITECTURE_AMD64:
         arch = "x64";
         break;
      case PROCESSOR_ARCHITECTURE_INTEL:
         arch = "x86";
         break;
      case PROCESSOR_ARCHITECTURE_ARM:
         arch = "ARM";
         break;
      default:
         break;
   }
#else
   OSVERSIONINFO vi = {0};
   vi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);

   /* Available from NT 3.5 and Win95 */
   GetVersionEx(&vi);
#endif

   if (major)
      *major = vi.dwMajorVersion;

   if (minor)
      *minor = vi.dwMinorVersion;

   if (vi.dwMajorVersion == 4 && vi.dwMinorVersion == 0)
      snprintf(buildStr, sizeof(buildStr), "%lu", (DWORD)(LOWORD(vi.dwBuildNumber))); /* Windows 95 build number is in the low-order word only */
   else
      snprintf(buildStr, sizeof(buildStr), "%lu", vi.dwBuildNumber);

   switch (vi.dwMajorVersion)
   {
      case 10:
         if (server)
            strcpy_literal(s, "Windows Server 2016");
         else
            strcpy_literal(s, "Windows 10");
         break;
      case 6:
         switch (vi.dwMinorVersion)
         {
            case 3:
               if (server)
                  strcpy_literal(s, "Windows Server 2012 R2");
               else
                  strcpy_literal(s, "Windows 8.1");
               break;
            case 2:
               if (server)
                  strcpy_literal(s, "Windows Server 2012");
               else
                  strcpy_literal(s, "Windows 8");
               break;
            case 1:
               if (server)
                  strcpy_literal(s, "Windows Server 2008 R2");
               else
                  strcpy_literal(s, "Windows 7");
               break;
            case 0:
               if (server)
                  strcpy_literal(s, "Windows Server 2008");
               else
                  strcpy_literal(s, "Windows Vista");
               break;
            default:
               break;
         }
         break;
      case 5:
         switch (vi.dwMinorVersion)
         {
            case 2:
               if (server)
               {
                  strcpy_literal(s, "Windows Server 2003");
                  if (GetSystemMetrics(SM_SERVERR2))
                     strlcat(s, " R2", len);
               }
               else
               {
                  /* Yes, XP Pro x64 is a higher version number than XP x86 */
                  if (string_is_equal(arch, "x64"))
                     strcpy_literal(s, "Windows XP");
               }
               break;
            case 1:
               strcpy_literal(s, "Windows XP");
               break;
            case 0:
               strcpy_literal(s, "Windows 2000");
               break;
         }
         break;
      case 4:
         switch (vi.dwMinorVersion)
         {
            case 0:
               if (vi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
                  strcpy_literal(s, "Windows 95");
               else if (vi.dwPlatformId == VER_PLATFORM_WIN32_NT)
                  strcpy_literal(s, "Windows NT 4.0");
               else
                  strcpy_literal(s, "Unknown");
               break;
            case 90:
               strcpy_literal(s, "Windows ME");
               break;
            case 10:
               strcpy_literal(s, "Windows 98");
               break;
         }
         break;
      default:
         snprintf(s, len, "Windows %i.%i", *major, *minor);
         break;
   }

   if (!string_is_empty(arch))
   {
      strlcat(s, " ", len);
      strlcat(s, arch, len);
   }

   strlcat(s, " Build ", len);
   strlcat(s, buildStr, len);

   if (!string_is_empty(vi.szCSDVersion))
   {
      strlcat(s, " ", len);
      strlcat(s, vi.szCSDVersion, len);
   }

}

static void frontend_win32_init(void *data)
{
   typedef BOOL (WINAPI *isProcessDPIAwareProc)();
   typedef BOOL (WINAPI *setProcessDPIAwareProc)();
#ifdef HAVE_DYNAMIC
   HMODULE handle                         =
      GetModuleHandle("User32.dll");
   isProcessDPIAwareProc  isDPIAwareProc  =
      (isProcessDPIAwareProc)dylib_proc(handle, "IsProcessDPIAware");
   setProcessDPIAwareProc setDPIAwareProc =
      (setProcessDPIAwareProc)dylib_proc(handle, "SetProcessDPIAware");
#else
   isProcessDPIAwareProc  isDPIAwareProc  = IsProcessDPIAware;
   setProcessDPIAwareProc setDPIAwareProc = SetProcessDPIAware;
#endif

   if (isDPIAwareProc)
      if (!isDPIAwareProc())
         if (setDPIAwareProc)
            setDPIAwareProc();
}


#ifdef HAVE_NVDA
static void init_nvda(void)
{
#ifdef HAVE_DYNAMIC
   if (USE_NVDA && !nvdalib)
   {
      nvdalib = dylib_load("nvdaControllerClient64.dll");
      if (!nvdalib)
      {
         USE_NVDA = false;
         USE_POWERSHELL = true;
      }
      else
      {
         nvdaController_testIfRunning_func = ( unsigned long (__stdcall*)(void))dylib_proc(nvdalib, "nvdaController_testIfRunning");
         nvdaController_cancelSpeech_func = (unsigned long(__stdcall *)(void))dylib_proc(nvdalib, "nvdaController_cancelSpeech");
         nvdaController_brailleMessage_func = (unsigned long(__stdcall *)(wchar_t*))dylib_proc(nvdalib, "nvdaController_brailleMessage");
         nvdaController_speakText_func = (unsigned long(__stdcall *)(wchar_t*))dylib_proc(nvdalib, "nvdaController_speakText");
      
      }
   }
#else
   USE_NVDA = false;
   USE_POWERSHELL = true;
#endif
}
#endif

enum frontend_powerstate frontend_win32_get_powerstate(int *seconds, int *percent)
{
   SYSTEM_POWER_STATUS status;
   enum frontend_powerstate ret = FRONTEND_POWERSTATE_NONE;

   if (!GetSystemPowerStatus(&status))
      return ret;

   if (status.BatteryFlag == 0xFF)
      ret = FRONTEND_POWERSTATE_NONE;
   else if (status.BatteryFlag & (1 << 7))
      ret = FRONTEND_POWERSTATE_NO_SOURCE;
   else if (status.BatteryFlag & (1 << 3))
      ret = FRONTEND_POWERSTATE_CHARGING;
   else if (status.ACLineStatus == 1)
      ret = FRONTEND_POWERSTATE_CHARGED;
   else
      ret = FRONTEND_POWERSTATE_ON_POWER_SOURCE;

   *percent  = (int)status.BatteryLifePercent;
   *seconds  = (int)status.BatteryLifeTime;

#ifdef _WIN32
   if (*percent == 255)
      *percent = 0;
#endif

   return ret;
}

enum frontend_architecture frontend_win32_get_arch(void)
{
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500
   /* Windows 2000 and later */
   SYSTEM_INFO si = {{0}};

   GetSystemInfo(&si);

   switch (si.wProcessorArchitecture)
   {
      case PROCESSOR_ARCHITECTURE_AMD64:
         return FRONTEND_ARCH_X86_64;
         break;
      case PROCESSOR_ARCHITECTURE_INTEL:
         return FRONTEND_ARCH_X86;
         break;
      case PROCESSOR_ARCHITECTURE_ARM:
         return FRONTEND_ARCH_ARM;
         break;
      default:
         break;
   }
#endif

   return FRONTEND_ARCH_NONE;
}

static int frontend_win32_parse_drive_list(void *data, bool load_content)
{
#ifdef HAVE_MENU
   file_list_t *list = (file_list_t*)data;
   enum msg_hash_enums enum_idx = load_content ?
         MENU_ENUM_LABEL_FILE_DETECT_CORE_LIST_PUSH_DIR :
         MENU_ENUM_LABEL_FILE_BROWSER_DIRECTORY;
   size_t i          = 0;
   unsigned drives   = GetLogicalDrives();
   char    drive[]   = " :\\";

   for (i = 0; i < 32; i++)
   {
      drive[0] = 'A' + i;
      if (drives & (1 << i))
         menu_entries_append_enum(list,
               drive,
               msg_hash_to_str(MENU_ENUM_LABEL_FILE_DETECT_CORE_LIST_PUSH_DIR),
               enum_idx,
               FILE_TYPE_DIRECTORY, 0, 0);
   }
#endif

   return 0;
}

static void frontend_win32_env_get(int *argc, char *argv[],
      void *args, void *params_data)
{
   const char *tmp_dir = getenv("TMP");
   if (!string_is_empty(tmp_dir))
      fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_CACHE],
         tmp_dir, sizeof(g_defaults.dirs[DEFAULT_DIR_CACHE]));

   gfx_set_dwm();

   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_ASSETS],
      ":\\assets", sizeof(g_defaults.dirs[DEFAULT_DIR_ASSETS]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_AUDIO_FILTER],
      ":\\filters\\audio", sizeof(g_defaults.dirs[DEFAULT_DIR_AUDIO_FILTER]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_VIDEO_FILTER],
      ":\\filters\\video", sizeof(g_defaults.dirs[DEFAULT_DIR_VIDEO_FILTER]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_CHEATS],
      ":\\cheats", sizeof(g_defaults.dirs[DEFAULT_DIR_CHEATS]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_DATABASE],
      ":\\database\\rdb", sizeof(g_defaults.dirs[DEFAULT_DIR_DATABASE]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_CURSOR],
      ":\\database\\cursors", sizeof(g_defaults.dirs[DEFAULT_DIR_CURSOR]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_PLAYLIST],
      ":\\playlists", sizeof(g_defaults.dirs[DEFAULT_DIR_ASSETS]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_RECORD_CONFIG],
      ":\\config\\record", sizeof(g_defaults.dirs[DEFAULT_DIR_RECORD_CONFIG]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_RECORD_OUTPUT],
      ":\\recordings", sizeof(g_defaults.dirs[DEFAULT_DIR_RECORD_OUTPUT]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_MENU_CONFIG],
      ":\\config", sizeof(g_defaults.dirs[DEFAULT_DIR_MENU_CONFIG]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_REMAP],
      ":\\config\\remaps", sizeof(g_defaults.dirs[DEFAULT_DIR_REMAP]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_WALLPAPERS],
      ":\\assets\\wallpapers", sizeof(g_defaults.dirs[DEFAULT_DIR_WALLPAPERS]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_THUMBNAILS],
      ":\\thumbnails", sizeof(g_defaults.dirs[DEFAULT_DIR_THUMBNAILS]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_OVERLAY],
      ":\\overlays", sizeof(g_defaults.dirs[DEFAULT_DIR_OVERLAY]));
#ifdef HAVE_VIDEO_LAYOUT
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_VIDEO_LAYOUT],
      ":\\layouts", sizeof(g_defaults.dirs[DEFAULT_DIR_VIDEO_LAYOUT]));
#endif
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_CORE],
      ":\\cores", sizeof(g_defaults.dirs[DEFAULT_DIR_CORE]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_CORE_INFO],
      ":\\info", sizeof(g_defaults.dirs[DEFAULT_DIR_CORE_INFO]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_AUTOCONFIG],
      ":\\autoconfig", sizeof(g_defaults.dirs[DEFAULT_DIR_AUTOCONFIG]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_SHADER],
      ":\\shaders", sizeof(g_defaults.dirs[DEFAULT_DIR_SHADER]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_CORE_ASSETS],
      ":\\downloads", sizeof(g_defaults.dirs[DEFAULT_DIR_CORE_ASSETS]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_SCREENSHOT],
      ":\\screenshots", sizeof(g_defaults.dirs[DEFAULT_DIR_SCREENSHOT]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_SRAM],
      ":\\saves", sizeof(g_defaults.dirs[DEFAULT_DIR_SRAM]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_SAVESTATE],
      ":\\states", sizeof(g_defaults.dirs[DEFAULT_DIR_SAVESTATE]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_SYSTEM],
      ":\\system", sizeof(g_defaults.dirs[DEFAULT_DIR_SYSTEM]));
   fill_pathname_expand_special(g_defaults.dirs[DEFAULT_DIR_LOGS],
      ":\\logs", sizeof(g_defaults.dirs[DEFAULT_DIR_LOGS]));

#ifndef IS_SALAMANDER
   dir_check_defaults("custom.ini");
#endif
}

static uint64_t frontend_win32_get_total_mem(void)
{
   /* OSes below 2000 don't have the Ex version,
    * and non-Ex cannot work with >4GB RAM */
#if _WIN32_WINNT >= 0x0500
   MEMORYSTATUSEX mem_info;
   mem_info.dwLength = sizeof(MEMORYSTATUSEX);
   GlobalMemoryStatusEx(&mem_info);
   return mem_info.ullTotalPhys;
#else
   MEMORYSTATUS mem_info;
   mem_info.dwLength = sizeof(MEMORYSTATUS);
   GlobalMemoryStatus(&mem_info);
   return mem_info.dwTotalPhys;
#endif
}

static uint64_t frontend_win32_get_free_mem(void)
{
   /* OSes below 2000 don't have the Ex version,
    * and non-Ex cannot work with >4GB RAM */
#if _WIN32_WINNT >= 0x0500
   MEMORYSTATUSEX mem_info;
   mem_info.dwLength = sizeof(MEMORYSTATUSEX);
   GlobalMemoryStatusEx(&mem_info);
   return mem_info.ullAvailPhys;
#else
   MEMORYSTATUS mem_info;
   mem_info.dwLength = sizeof(MEMORYSTATUS);
   GlobalMemoryStatus(&mem_info);
   return mem_info.dwAvailPhys;
#endif
}

static void frontend_win32_attach_console(void)
{
#ifdef _WIN32
#ifdef _WIN32_WINNT_WINXP
   /* msys will start the process with FILE_TYPE_PIPE connected.
    *   cmd will start the process with FILE_TYPE_UNKNOWN connected
    *   (since this is subsystem windows application
    * ... UNLESS stdout/stderr were redirected (then FILE_TYPE_DISK
    * will be connected most likely)
    * explorer will start the process with NOTHING connected.
    *
    * Now, let's not reconnect anything that's already connected.
    * If any are disconnected, open a console, and connect to them.
    * In case we're launched from msys or cmd, try attaching to the
    * parent process console first.
    *
    * Take care to leave a record of what we did, so we can
    * undo it precisely.
    */

   bool need_stdout = (GetFileType(GetStdHandle(STD_OUTPUT_HANDLE))
         == FILE_TYPE_UNKNOWN);
   bool need_stderr = (GetFileType(GetStdHandle(STD_ERROR_HANDLE))
         == FILE_TYPE_UNKNOWN);

   if (need_stdout || need_stderr)
   {
      if (!AttachConsole( ATTACH_PARENT_PROCESS))
         AllocConsole();

      SetConsoleTitle("Log Console");

      if (need_stdout)
         freopen( "CONOUT$", "w", stdout );
      if (need_stderr)
         freopen( "CONOUT$", "w", stderr );

      console_needs_free = true;
   }

#endif
#endif
}

static void frontend_win32_detach_console(void)
{
#if defined(_WIN32) && !defined(_XBOX)
#ifdef _WIN32_WINNT_WINXP
   if (console_needs_free)
   {
      /* we don't reconnect stdout/stderr to anything here,
       * because by definition, they weren't connected to
       * anything in the first place. */
      FreeConsole();
      console_needs_free = false;
   }
#endif
#endif
}

static const char* frontend_win32_get_cpu_model_name(void)
{
#ifdef ANDROID
   return NULL;
#else
   cpu_features_get_model_name(win32_cpu_model_name, sizeof(win32_cpu_model_name));
   return win32_cpu_model_name;
#endif
}

enum retro_language frontend_win32_get_user_language(void)
{
   enum retro_language lang = RETRO_LANGUAGE_ENGLISH;
#if defined(HAVE_LANGEXTRA) && !defined(_XBOX)
#if (defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500) || !defined(_MSC_VER)
   LANGID langid = GetUserDefaultUILanguage();
   lang = win32_get_retro_lang_from_langid(langid);
#endif
#endif
   return lang;
}

#if defined(_WIN32) && !defined(_XBOX)
enum frontend_fork win32_fork_mode;

static void frontend_win32_respawn(char *s, size_t len, char *args)
{
   STARTUPINFO si;
   PROCESS_INFORMATION pi;
   char executable_path[PATH_MAX_LENGTH] = {0};

   if (win32_fork_mode != FRONTEND_FORK_RESTART)
      return;

   fill_pathname_application_path(executable_path,
         sizeof(executable_path));
   path_set(RARCH_PATH_CORE, executable_path);
   RARCH_LOG("Restarting RetroArch with commandline: %s and %s\n",
      executable_path, args);

   memset(&si, 0, sizeof(si));
   si.cb = sizeof(si);
   memset(&pi, 0, sizeof(pi));

   if (!CreateProcess( executable_path, args,
      NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi))
   {
      RARCH_LOG("Failed to restart RetroArch\n");
   }
}

static bool frontend_win32_set_fork(enum frontend_fork fork_mode)
{
   switch (fork_mode)
   {
      case FRONTEND_FORK_CORE:
         break;
      case FRONTEND_FORK_CORE_WITH_ARGS:
         break;
      case FRONTEND_FORK_RESTART:
         command_event(CMD_EVENT_QUIT, NULL);
         break;
      case FRONTEND_FORK_NONE:
      default:
         break;
   }
   win32_fork_mode = fork_mode;
   return true;
}
#endif

#if defined(_WIN32) && !defined(_XBOX)
static const char *accessibility_win_language_id(const char* language)
{
   if (string_is_equal(language,"en"))
      return "409";
   else if (string_is_equal(language,"it"))
      return "410";
   else if (string_is_equal(language,"sv"))
      return "041d";
   else if (string_is_equal(language,"fr"))
      return "040c";
   else if (string_is_equal(language,"de"))
      return "407";
   else if (string_is_equal(language,"he"))
      return "040d";
   else if (string_is_equal(language,"id"))
      return "421";
   else if (string_is_equal(language,"es"))
      return "040a";
   else if (string_is_equal(language,"nl"))
      return "413";
   else if (string_is_equal(language,"ro"))
      return "418";
   else if (string_is_equal(language,"pt_pt"))
      return "816";
   else if (string_is_equal(language,"pt_bt") || string_is_equal(language,"pt"))
      return "416";
   else if (string_is_equal(language,"th"))
      return "041e";
   else if (string_is_equal(language,"ja"))
      return "411";
   else if (string_is_equal(language,"sk"))
      return "041b";
   else if (string_is_equal(language,"hi"))
      return "439";
   else if (string_is_equal(language,"ar"))
      return "401";
   else if (string_is_equal(language,"hu"))
      return "040e";
   else if (string_is_equal(language,"zh_tw") || string_is_equal(language,"zh"))
      return "804";
   else if (string_is_equal(language,"el"))
      return "408";
   else if (string_is_equal(language,"ru"))
      return "419";
   else if (string_is_equal(language,"nb"))
      return "414";
   else if (string_is_equal(language,"da"))
      return "406";
   else if (string_is_equal(language,"fi"))
      return "040b";
   else if (string_is_equal(language,"zh_hk"))
      return "0c04";
   else if (string_is_equal(language,"zh_cn"))
      return "804";
   else if (string_is_equal(language,"tr"))
      return "041f";
   else if (string_is_equal(language,"ko"))
      return "412";
   else if (string_is_equal(language,"pl"))
      return "415";
   else if (string_is_equal(language,"cs")) 
      return "405";
   else
      return "";


}

static const char *accessibility_win_language_code(const char* language)
{
   if (string_is_equal(language,"en"))
      return "Microsoft David Desktop";
   else if (string_is_equal(language,"it"))
      return "Microsoft Cosimo Desktop";
   else if (string_is_equal(language,"sv"))
      return "Microsoft Bengt Desktop";
   else if (string_is_equal(language,"fr"))
      return "Microsoft Paul Desktop";
   else if (string_is_equal(language,"de"))
      return "Microsoft Stefan Desktop";
   else if (string_is_equal(language,"he"))
      return "Microsoft Asaf Desktop";
   else if (string_is_equal(language,"id"))
      return "Microsoft Andika Desktop";
   else if (string_is_equal(language,"es"))
      return "Microsoft Pablo Desktop";
   else if (string_is_equal(language,"nl"))
      return "Microsoft Frank Desktop";
   else if (string_is_equal(language,"ro"))
      return "Microsoft Andrei Desktop";
   else if (string_is_equal(language,"pt_pt"))
      return "Microsoft Helia Desktop";
   else if (string_is_equal(language,"pt_bt") || string_is_equal(language,"pt"))
      return "Microsoft Daniel Desktop";
   else if (string_is_equal(language,"th"))
      return "Microsoft Pattara Desktop";
   else if (string_is_equal(language,"ja"))
      return "Microsoft Ichiro Desktop";
   else if (string_is_equal(language,"sk"))
      return "Microsoft Filip Desktop";
   else if (string_is_equal(language,"hi"))
      return "Microsoft Hemant Desktop";
   else if (string_is_equal(language,"ar"))
      return "Microsoft Naayf Desktop";
   else if (string_is_equal(language,"hu"))
      return "Microsoft Szabolcs Desktop";
   else if (string_is_equal(language,"zh_tw") || string_is_equal(language,"zh"))
      return "Microsoft Zhiwei Desktop";
   else if (string_is_equal(language,"el"))
      return "Microsoft Stefanos Desktop";
   else if (string_is_equal(language,"ru"))
      return "Microsoft Pavel Desktop";
   else if (string_is_equal(language,"nb"))
      return "Microsoft Jon Desktop";
   else if (string_is_equal(language,"da"))
      return "Microsoft Helle Desktop";
   else if (string_is_equal(language,"fi"))
      return "Microsoft Heidi Desktop";
   else if (string_is_equal(language,"zh_hk"))
      return "Microsoft Danny Desktop";
   else if (string_is_equal(language,"zh_cn"))
      return "Microsoft Kangkang Desktop";
   else if (string_is_equal(language,"tr"))
      return "Microsoft Tolga Desktop";
   else if (string_is_equal(language,"ko"))
      return "Microsoft Heami Desktop";
   else if (string_is_equal(language,"pl"))
      return "Microsoft Adam Desktop";
   else if (string_is_equal(language,"cs")) 
      return "Microsoft Jakub Desktop";
   else
      return "";
}

static bool terminate_win32_process(PROCESS_INFORMATION pi)
{
   TerminateProcess(pi.hProcess,0);
   CloseHandle(pi.hProcess);
   CloseHandle(pi.hThread);
   return true;
}

static PROCESS_INFORMATION g_pi;

static bool create_win32_process(char* cmd)
{
   STARTUPINFO si;
   memset(&si, 0, sizeof(si));
   si.cb = sizeof(si);
   memset(&g_pi, 0, sizeof(g_pi));

   if (!CreateProcess(NULL, cmd, NULL, NULL, FALSE, CREATE_NO_WINDOW,
                      NULL, NULL, &si, &g_pi))
      return false;
   return true;
}

static bool is_narrator_running_windows(void)
{
   DWORD status = 0;
#ifdef HAVE_NVDA
   init_nvda();
#endif

   if (USE_POWERSHELL)
   {
      if (pi_set == false)
         return false;
      if (GetExitCodeProcess(g_pi.hProcess, &status))
      {
         if (status == STILL_ACTIVE)
            return true;
      }
      return false;
   }
#ifdef HAVE_NVDA
   else if (USE_NVDA)
   {
      long res;
      res = nvdaController_testIfRunning_func();

      if (res != 0) 
      {
         /* The running nvda service wasn't found, so revert
            back to the powershell method
         */
         RARCH_LOG("Error communicating with NVDA\n");
         USE_POWERSHELL = true;
         USE_NVDA       = false;
	 return false;
      }
      return false;
   }
#endif
#ifdef HAVE_SAPI
   else
   {
      SPVOICESTATUS pStatus;
      if (pVoice)
      {
         ISpVoice_GetStatus(pVoice, &pStatus, NULL);
         if (pStatus.dwRunningState == SPRS_IS_SPEAKING)
            return true;
      }
   }
#endif
   return false;
}

static bool accessibility_speak_windows(int speed,
      const char* speak_text, int priority)
{
   char *cmd = NULL;
   const char *voice      = get_user_language_iso639_1(true);
   const char *language   = accessibility_win_language_code(voice);
   const char *langid     = accessibility_win_language_id(voice);
   bool res               = false;
   const char* speeds[10] = {"-10", "-7.5", "-5", "-2.5", "0", "2", "4", "6", "8", "10"};
   size_t nbytes_cmd = 0;
   if (speed < 1)
      speed = 1;
   else if (speed > 10)
      speed = 10;

   if (priority < 10)
   {
      if (is_narrator_running_windows())
         return true;
   
   }
#ifdef HAVE_NVDA
   init_nvda();
#endif
   
   if (USE_POWERSHELL && !strchr(speak_text, '"') && !strchr(speak_text, '\\') && !strstr(speak_text, "$(")) // TODO: escape these things properly instead of rejecting the entire string
   {
      const char * template_lang = "powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.SelectVoice(\\\"%s\\\"); $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"";
      const char * template_nolang = "powershell.exe -NoProfile -WindowStyle Hidden -Command \"Add-Type -AssemblyName System.Speech; $synth = New-Object System.Speech.Synthesis.SpeechSynthesizer; $synth.Rate = %s; $synth.Speak(\\\"%s\\\");\"";
      if (strlen(language) > 0) 
      {
         nbytes_cmd = snprintf(NULL, 0, template_lang, language, speeds[speed-1], speak_text) + 1;
         if (!(cmd = malloc(nbytes_cmd)))
            return false;
         snprintf(cmd, nbytes_cmd, template_lang, language, speeds[speed-1], speak_text);
      }
      else
      {
         nbytes_cmd = snprintf(NULL, 0, template_nolang, speeds[speed-1], speak_text) + 1;
         if (!(cmd = malloc(nbytes_cmd)))
            return false;
         snprintf(cmd, nbytes_cmd, template_nolang, speeds[speed-1], speak_text); 
      }

      if (pi_set)
         terminate_win32_process(g_pi);
      res = create_win32_process(cmd);
      free(cmd);
      cmd = NULL;
      if (!res)
      {
         pi_set = false;
         return true;
      }
      pi_set = true;
   }
#ifdef HAVE_NVDA
   else if (USE_NVDA)
   {
      wchar_t        *wc = utf8_to_utf16_string_alloc(speak_text);
      long res           = nvdaController_testIfRunning_func();

      if (!wc || res != 0) 
      {
         RARCH_LOG("Error communicating with NVDA\n");
         if (wc)
            free(wc);
         return false;
      }

      nvdaController_cancelSpeech_func();

      if (USE_NVDA_BRAILLE)
         nvdaController_brailleMessage_func(wc);
      else
         nvdaController_speakText_func(wc);
      free(wc);
   }
#endif
#ifdef HAVE_SAPI
   else
   {
      HRESULT hr;
      /* stop the old voice if running */
      if (pVoice)
      {
         CoUninitialize();
         ISpVoice_Release(pVoice);
      }
      pVoice = NULL;

      /* Play the new voice */
      if (FAILED(CoInitialize(NULL)))
         return NULL;

      hr = CoCreateInstance(&CLSID_SpVoice, NULL,
            CLSCTX_ALL, &IID_ISpVoice, (void **)&pVoice);

      if (SUCCEEDED(hr))
      {
         wchar_t        *wc = utf8_to_utf16_string_alloc(speak_text);
         if (!wc)
            return false;
         hr = ISpVoice_Speak(pVoice, wc, SPF_ASYNC /*SVSFlagsAsync*/, NULL);
         free(wc);
      }
   }
#endif

   return true;
}
#endif

frontend_ctx_driver_t frontend_ctx_win32 = {
   frontend_win32_env_get,         /* env_get   */
   frontend_win32_init,            /* init      */
   NULL,                           /* deinit    */
#if defined(_WIN32) && !defined(_XBOX)
   frontend_win32_respawn,         /* exitspawn */
#else
   NULL,                           /* exitspawn */
#endif
   NULL,                           /* process_args */
   NULL,                           /* exec */
#if defined(_WIN32) && !defined(_XBOX)
   frontend_win32_set_fork,        /* set_fork */
#else
   NULL,                           /* set_fork */
#endif
   NULL,                           /* shutdown                  */
   NULL,                           /* get_name                  */
   frontend_win32_get_os,
   NULL,                           /* get_rating                */
   NULL,                           /* content_loaded            */
   frontend_win32_get_arch,        /* get_architecture          */
   frontend_win32_get_powerstate,
   frontend_win32_parse_drive_list,
   frontend_win32_get_total_mem,
   frontend_win32_get_free_mem,
   NULL,                            /* install_signal_handler   */
   NULL,                            /* get_sighandler_state     */
   NULL,                            /* set_sighandler_state     */
   NULL,                            /* destroy_sighandler_state */
   frontend_win32_attach_console,   /* attach_console           */
   frontend_win32_detach_console,   /* detach_console           */
   NULL,                            /* get_lakka_version        */
   NULL,                            /* set_screen_brightness    */
   NULL,                            /* watch_path_for_changes   */
   NULL,                            /* check_for_path_changes   */
   NULL,                            /* set_sustained_performance_mode */
   frontend_win32_get_cpu_model_name,
   frontend_win32_get_user_language,
#if defined(_WIN32) && !defined(_XBOX)
   is_narrator_running_windows,     /* is_narrator_running */
   accessibility_speak_windows,     /* accessibility_speak */
#else
   NULL,                            /* is_narrator_running */
   NULL,                            /* accessibility_speak */
#endif
   "win32",                         /* ident               */
   NULL                             /* get_video_driver    */
};