kc3-lang/SDL/src/core/windows/SDL_xinput.c

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• Hash : a8780c6a
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  Date : 2020-01-16T20:49:25
  

  Updated copyright date for 2020

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• src/core/windows/SDL_xinput.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.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.
  */
  #include "../../SDL_internal.h"
  
  #include "SDL_assert.h"
  #include "SDL_xinput.h"
  
  
  #ifdef HAVE_XINPUT_H
  
  XInputGetState_t SDL_XInputGetState = NULL;
  XInputSetState_t SDL_XInputSetState = NULL;
  XInputGetCapabilities_t SDL_XInputGetCapabilities = NULL;
  XInputGetBatteryInformation_t SDL_XInputGetBatteryInformation = NULL;
  DWORD SDL_XInputVersion = 0;
  
  static HANDLE s_pXInputDLL = 0;
  static int s_XInputDLLRefCount = 0;
  
  
  #ifdef __WINRT__
  
  int
  WIN_LoadXInputDLL(void)
  {
      /* Getting handles to system dlls (via LoadLibrary and its variants) is not
       * supported on WinRT, thus, pointers to XInput's functions can't be
       * retrieved via GetProcAddress.
       *
       * When on WinRT, assume that XInput is already loaded, and directly map
       * its XInput.h-declared functions to the SDL_XInput* set of function
       * pointers.
       *
       * Side-note: XInputGetStateEx is not available for use in WinRT.
       * This seems to mean that support for the guide button is not available
       * in WinRT, unfortunately.
       */
      SDL_XInputGetState = (XInputGetState_t)XInputGetState;
      SDL_XInputSetState = (XInputSetState_t)XInputSetState;
      SDL_XInputGetCapabilities = (XInputGetCapabilities_t)XInputGetCapabilities;
      SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)XInputGetBatteryInformation;
  
      /* XInput 1.4 ships with Windows 8 and 8.1: */
      SDL_XInputVersion = (1 << 16) | 4;
  
      return 0;
  }
  
  void
  WIN_UnloadXInputDLL(void)
  {
  }
  
  #else /* !__WINRT__ */
  
  int
  WIN_LoadXInputDLL(void)
  {
      DWORD version = 0;
  
      if (s_pXInputDLL) {
          SDL_assert(s_XInputDLLRefCount > 0);
          s_XInputDLLRefCount++;
          return 0;  /* already loaded */
      }
  
      version = (1 << 16) | 4;
      s_pXInputDLL = LoadLibrary(L"XInput1_4.dll");  /* 1.4 Ships with Windows 8. */
      if (!s_pXInputDLL) {
          version = (1 << 16) | 3;
          s_pXInputDLL = LoadLibrary(L"XInput1_3.dll");  /* 1.3 can be installed as a redistributable component. */
      }
      if (!s_pXInputDLL) {
          s_pXInputDLL = LoadLibrary(L"bin\\XInput1_3.dll");
      }
      if (!s_pXInputDLL) {
          /* "9.1.0" Ships with Vista and Win7, and is more limited than 1.3+ (e.g. XInputGetStateEx is not available.)  */
          s_pXInputDLL = LoadLibrary(L"XInput9_1_0.dll");
      }
      if (!s_pXInputDLL) {
          return -1;
      }
  
      SDL_assert(s_XInputDLLRefCount == 0);
      SDL_XInputVersion = version;
      s_XInputDLLRefCount = 1;
  
      /* 100 is the ordinal for _XInputGetStateEx, which returns the same struct as XinputGetState, but with extra data in wButtons for the guide button, we think... */
      SDL_XInputGetState = (XInputGetState_t)GetProcAddress((HMODULE)s_pXInputDLL, (LPCSTR)100);
      if (!SDL_XInputGetState) {
          SDL_XInputGetState = (XInputGetState_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputGetState");
      }
      SDL_XInputSetState = (XInputSetState_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputSetState");
      SDL_XInputGetCapabilities = (XInputGetCapabilities_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputGetCapabilities");
      SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)GetProcAddress( (HMODULE)s_pXInputDLL, "XInputGetBatteryInformation" );
      if (!SDL_XInputGetState || !SDL_XInputSetState || !SDL_XInputGetCapabilities) {
          WIN_UnloadXInputDLL();
          return -1;
      }
  
      return 0;
  }
  
  void
  WIN_UnloadXInputDLL(void)
  {
      if (s_pXInputDLL) {
          SDL_assert(s_XInputDLLRefCount > 0);
          if (--s_XInputDLLRefCount == 0) {
              FreeLibrary(s_pXInputDLL);
              s_pXInputDLL = NULL;
          }
      } else {
          SDL_assert(s_XInputDLLRefCount == 0);
      }
  }
  
  #endif /* __WINRT__ */
  #endif /* HAVE_XINPUT_H */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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