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FORK: Simple Directmedia Layer
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SDL_hid.c (3392B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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 #ifndef __WINRT__
     24 
     25 #include "SDL_hid.h"
     26 
     27 
     28 HidD_GetString_t SDL_HidD_GetManufacturerString;
     29 HidD_GetString_t SDL_HidD_GetProductString;
     30 HidD_GetPreparsedData_t SDL_HidD_GetPreparsedData;
     31 HidD_FreePreparsedData_t SDL_HidD_FreePreparsedData;
     32 HidP_GetCaps_t SDL_HidP_GetCaps;
     33 HidP_GetButtonCaps_t SDL_HidP_GetButtonCaps;
     34 HidP_GetValueCaps_t SDL_HidP_GetValueCaps;
     35 HidP_MaxDataListLength_t SDL_HidP_MaxDataListLength;
     36 HidP_GetData_t SDL_HidP_GetData;
     37 
     38 static HMODULE s_pHIDDLL = 0;
     39 static int s_HIDDLLRefCount = 0;
     40 
     41 
     42 int
     43 WIN_LoadHIDDLL(void)
     44 {
     45     if (s_pHIDDLL) {
     46         SDL_assert(s_HIDDLLRefCount > 0);
     47         s_HIDDLLRefCount++;
     48         return 0;  /* already loaded */
     49     }
     50 
     51     s_pHIDDLL = LoadLibrary(L"hid.dll");
     52     if (!s_pHIDDLL) {
     53         return -1;
     54     }
     55 
     56     SDL_assert(s_HIDDLLRefCount == 0);
     57     s_HIDDLLRefCount = 1;
     58 
     59     SDL_HidD_GetManufacturerString = (HidD_GetString_t)GetProcAddress(s_pHIDDLL, "HidD_GetManufacturerString");
     60     SDL_HidD_GetProductString = (HidD_GetString_t)GetProcAddress(s_pHIDDLL, "HidD_GetProductString");
     61     SDL_HidD_GetPreparsedData = (HidD_GetPreparsedData_t)GetProcAddress(s_pHIDDLL, "HidD_GetPreparsedData");
     62     SDL_HidD_FreePreparsedData = (HidD_FreePreparsedData_t)GetProcAddress(s_pHIDDLL, "HidD_FreePreparsedData");
     63     SDL_HidP_GetCaps = (HidP_GetCaps_t)GetProcAddress(s_pHIDDLL, "HidP_GetCaps");
     64     SDL_HidP_GetButtonCaps = (HidP_GetButtonCaps_t)GetProcAddress(s_pHIDDLL, "HidP_GetButtonCaps");
     65     SDL_HidP_GetValueCaps = (HidP_GetValueCaps_t)GetProcAddress(s_pHIDDLL, "HidP_GetValueCaps");
     66     SDL_HidP_MaxDataListLength = (HidP_MaxDataListLength_t)GetProcAddress(s_pHIDDLL, "HidP_MaxDataListLength");
     67     SDL_HidP_GetData = (HidP_GetData_t)GetProcAddress(s_pHIDDLL, "HidP_GetData");
     68     if (!SDL_HidD_GetManufacturerString || !SDL_HidD_GetProductString || !SDL_HidD_GetPreparsedData ||
     69         !SDL_HidD_FreePreparsedData || !SDL_HidP_GetCaps || !SDL_HidP_GetButtonCaps ||
     70         !SDL_HidP_GetValueCaps || !SDL_HidP_MaxDataListLength || !SDL_HidP_GetData) {
     71         WIN_UnloadHIDDLL();
     72         return -1;
     73     }
     74 
     75     return 0;
     76 }
     77 
     78 void
     79 WIN_UnloadHIDDLL(void)
     80 {
     81     if (s_pHIDDLL) {
     82         SDL_assert(s_HIDDLLRefCount > 0);
     83         if (--s_HIDDLLRefCount == 0) {
     84             FreeLibrary(s_pHIDDLL);
     85             s_pHIDDLL = NULL;
     86         }
     87     } else {
     88         SDL_assert(s_HIDDLLRefCount == 0);
     89     }
     90 }
     91 
     92 #endif /* !__WINRT__ */
     93 
     94 /* vi: set ts=4 sw=4 expandtab: */