cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

SDL_xinput.c (4049B)

      1/*
      2  Simple DirectMedia Layer
      3  Copyright (C) 1997-2014 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#include "SDL_assert.h"
     24#include "SDL_xinput.h"
     25
     26
     27#ifdef HAVE_XINPUT_H
     28
     29XInputGetState_t SDL_XInputGetState = NULL;
     30XInputSetState_t SDL_XInputSetState = NULL;
     31XInputGetCapabilities_t SDL_XInputGetCapabilities = NULL;
     32DWORD SDL_XInputVersion = 0;
     33
     34static HANDLE s_pXInputDLL = 0;
     35static int s_XInputDLLRefCount = 0;
     36
     37
     38#ifdef __WINRT__
     39
     40int
     41WIN_LoadXInputDLL(void)
     42{
     43    /* Getting handles to system dlls (via LoadLibrary and its variants) is not
     44     * supported on WinRT, thus, pointers to XInput's functions can't be
     45     * retrieved via GetProcAddress.
     46     *
     47     * When on WinRT, assume that XInput is already loaded, and directly map
     48     * its XInput.h-declared functions to the SDL_XInput* set of function
     49     * pointers.
     50     *
     51     * Side-note: XInputGetStateEx is not available for use in WinRT.
     52     * This seems to mean that support for the guide button is not available
     53     * in WinRT, unfortunately.
     54     */
     55    SDL_XInputGetState = (XInputGetState_t)XInputGetState;
     56    SDL_XInputSetState = (XInputSetState_t)XInputSetState;
     57    SDL_XInputGetCapabilities = (XInputGetCapabilities_t)XInputGetCapabilities;
     58
     59    /* XInput 1.4 ships with Windows 8 and 8.1: */
     60    SDL_XInputVersion = (1 << 16) | 4;
     61
     62    return 0;
     63}
     64
     65void
     66WIN_UnloadXInputDLL(void)
     67{
     68}
     69
     70#else /* !__WINRT__ */
     71
     72int
     73WIN_LoadXInputDLL(void)
     74{
     75    DWORD version = 0;
     76
     77    if (s_pXInputDLL) {
     78        SDL_assert(s_XInputDLLRefCount > 0);
     79        s_XInputDLLRefCount++;
     80        return 0;  /* already loaded */
     81    }
     82
     83    version = (1 << 16) | 4;
     84    s_pXInputDLL = LoadLibrary(L"XInput1_4.dll");  /* 1.4 Ships with Windows 8. */
     85    if (!s_pXInputDLL) {
     86        version = (1 << 16) | 3;
     87        s_pXInputDLL = LoadLibrary(L"XInput1_3.dll");  /* 1.3 Ships with Vista and Win7, can be installed as a redistributable component. */
     88    }
     89    if (!s_pXInputDLL) {
     90        s_pXInputDLL = LoadLibrary(L"bin\\XInput1_3.dll");
     91    }
     92    if (!s_pXInputDLL) {
     93        return -1;
     94    }
     95
     96    SDL_assert(s_XInputDLLRefCount == 0);
     97    SDL_XInputVersion = version;
     98    s_XInputDLLRefCount = 1;
     99
    100    /* 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... */
    101    SDL_XInputGetState = (XInputGetState_t)GetProcAddress((HMODULE)s_pXInputDLL, (LPCSTR)100);
    102    SDL_XInputSetState = (XInputSetState_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputSetState");
    103    SDL_XInputGetCapabilities = (XInputGetCapabilities_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputGetCapabilities");
    104    if (!SDL_XInputGetState || !SDL_XInputSetState || !SDL_XInputGetCapabilities) {
    105        WIN_UnloadXInputDLL();
    106        return -1;
    107    }
    108
    109    return 0;
    110}
    111
    112void
    113WIN_UnloadXInputDLL(void)
    114{
    115    if (s_pXInputDLL) {
    116        SDL_assert(s_XInputDLLRefCount > 0);
    117        if (--s_XInputDLLRefCount == 0) {
    118            FreeLibrary(s_pXInputDLL);
    119            s_pXInputDLL = NULL;
    120        }
    121    } else {
    122        SDL_assert(s_XInputDLLRefCount == 0);
    123    }
    124}
    125
    126#endif /* __WINRT__ */
    127#endif /* HAVE_XINPUT_H */
    128
    129/* vi: set ts=4 sw=4 expandtab: */