src/core/windows/SDL_windows.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 02 Jan 2016 10:10:34 -0800
changeset 9998 f67cf37e9cd4
parent 9709 cc44b8a34b2d
child 10278 1e7b4cfe8451
permissions -rw-r--r--
Updated copyright to 2016
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../../SDL_internal.h"
    22 
    23 #if defined(__WIN32__) || defined(__WINRT__)
    24 
    25 #include "SDL_windows.h"
    26 #include "SDL_error.h"
    27 #include "SDL_assert.h"
    28 
    29 #include <objbase.h>  /* for CoInitialize/CoUninitialize (Win32 only) */
    30 
    31 #ifndef _WIN32_WINNT_VISTA
    32 #define _WIN32_WINNT_VISTA  0x0600
    33 #endif
    34 
    35 
    36 /* Sets an error message based on GetLastError() */
    37 int
    38 WIN_SetErrorFromHRESULT(const char *prefix, HRESULT hr)
    39 {
    40     TCHAR buffer[1024];
    41     char *message;
    42     FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, hr, 0,
    43                   buffer, SDL_arraysize(buffer), NULL);
    44     message = WIN_StringToUTF8(buffer);
    45     SDL_SetError("%s%s%s", prefix ? prefix : "", prefix ? ": " : "", message);
    46     SDL_free(message);
    47     return -1;
    48 }
    49 
    50 /* Sets an error message based on GetLastError() */
    51 int
    52 WIN_SetError(const char *prefix)
    53 {
    54     return WIN_SetErrorFromHRESULT(prefix, GetLastError());
    55 }
    56 
    57 HRESULT
    58 WIN_CoInitialize(void)
    59 {
    60     /* SDL handles any threading model, so initialize with the default, which
    61        is compatible with OLE and if that doesn't work, try multi-threaded mode.
    62 
    63        If you need multi-threaded mode, call CoInitializeEx() before SDL_Init()
    64     */
    65 #ifdef __WINRT__
    66     /* DLudwig: On WinRT, it is assumed that COM was initialized in main().
    67        CoInitializeEx is available (not CoInitialize though), however
    68        on WinRT, main() is typically declared with the [MTAThread]
    69        attribute, which, AFAIK, should initialize COM.
    70     */
    71     return S_OK;
    72 #else
    73     HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
    74     if (hr == RPC_E_CHANGED_MODE) {
    75         hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
    76     }
    77 
    78     /* S_FALSE means success, but someone else already initialized. */
    79     /* You still need to call CoUninitialize in this case! */
    80     if (hr == S_FALSE) {
    81         return S_OK;
    82     }
    83 
    84     return hr;
    85 #endif
    86 }
    87 
    88 void
    89 WIN_CoUninitialize(void)
    90 {
    91 #ifndef __WINRT__
    92     CoUninitialize();
    93 #endif
    94 }
    95 
    96 #ifndef __WINRT__
    97 static BOOL
    98 IsWindowsVersionOrGreater(WORD wMajorVersion, WORD wMinorVersion, WORD wServicePackMajor)
    99 {
   100     OSVERSIONINFOEXW osvi;
   101     DWORDLONG const dwlConditionMask = VerSetConditionMask(
   102         VerSetConditionMask(
   103         VerSetConditionMask(
   104         0, VER_MAJORVERSION, VER_GREATER_EQUAL ),
   105         VER_MINORVERSION, VER_GREATER_EQUAL ),
   106         VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL );
   107 
   108     SDL_zero(osvi);
   109     osvi.dwOSVersionInfoSize = sizeof(osvi);
   110     osvi.dwMajorVersion = wMajorVersion;
   111     osvi.dwMinorVersion = wMinorVersion;
   112     osvi.wServicePackMajor = wServicePackMajor;
   113 
   114     return VerifyVersionInfoW(&osvi, VER_MAJORVERSION | VER_MINORVERSION | VER_SERVICEPACKMAJOR, dwlConditionMask) != FALSE;
   115 }
   116 #endif
   117 
   118 BOOL WIN_IsWindowsVistaOrGreater()
   119 {
   120 #ifdef __WINRT__
   121     return TRUE;
   122 #else
   123     return IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_VISTA), LOBYTE(_WIN32_WINNT_VISTA), 0);
   124 #endif
   125 }
   126 
   127 #endif /* __WIN32__ || __WINRT__ */
   128 
   129 /* vi: set ts=4 sw=4 expandtab: */