Atlas - SDL_xinput.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
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_xinput.h"
24
25// Set up for C function definitions, even when using C++
26#ifdef __cplusplus
27extern "C" {
28#endif
29
30XInputGetState_t SDL_XInputGetState = NULL;
31XInputSetState_t SDL_XInputSetState = NULL;
32XInputGetCapabilities_t SDL_XInputGetCapabilities = NULL;
33XInputGetCapabilitiesEx_t SDL_XInputGetCapabilitiesEx = NULL;
34XInputGetBatteryInformation_t SDL_XInputGetBatteryInformation = NULL;
35
36static HMODULE s_pXInputDLL = NULL;
37static int s_XInputDLLRefCount = 0;
38
39#if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
40
41bool WIN_LoadXInputDLL(void)
42{
43    /* Getting handles to system dlls (via LoadLibrary and its variants) is not
44     * supported on Xbox, thus, pointers to XInput's functions can't be
45     * retrieved via GetProcAddress.
46     *
47     * When on Xbox, 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    SDL_XInputGetState = (XInputGetState_t)XInputGetState;
52    SDL_XInputSetState = (XInputSetState_t)XInputSetState;
53    SDL_XInputGetCapabilities = (XInputGetCapabilities_t)XInputGetCapabilities;
54    SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)XInputGetBatteryInformation;
55
56    return true;
57}
58
59void WIN_UnloadXInputDLL(void)
60{
61}
62
63#else // !(defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES))
64
65bool WIN_LoadXInputDLL(void)
66{
67    if (s_pXInputDLL) {
68        SDL_assert(s_XInputDLLRefCount > 0);
69        s_XInputDLLRefCount++;
70        return true; // already loaded
71    }
72
73    /* NOTE: Don't load XinputUap.dll
74     * This is XInput emulation over Windows.Gaming.Input, and has all the
75     * limitations of that API (no devices at startup, no background input, etc.)
76     */
77    s_pXInputDLL = LoadLibrary(TEXT("XInput1_4.dll")); // 1.4 Ships with Windows 8.
78    if (!s_pXInputDLL) {
79        s_pXInputDLL = LoadLibrary(TEXT("XInput1_3.dll")); // 1.3 can be installed as a redistributable component.
80    }
81    if (!s_pXInputDLL) {
82        // "9.1.0" Ships with Vista and Win7, and is more limited than 1.3+ (e.g. XInputGetStateEx is not available.)
83        s_pXInputDLL = LoadLibrary(TEXT("XInput9_1_0.dll"));
84    }
85    if (!s_pXInputDLL) {
86        return false;
87    }
88
89    SDL_assert(s_XInputDLLRefCount == 0);
90    s_XInputDLLRefCount = 1;
91
92    // 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...
93    SDL_XInputGetState = (XInputGetState_t)GetProcAddress(s_pXInputDLL, (LPCSTR)100);
94    if (!SDL_XInputGetState) {
95        SDL_XInputGetState = (XInputGetState_t)GetProcAddress(s_pXInputDLL, "XInputGetState");
96    }
97    SDL_XInputSetState = (XInputSetState_t)GetProcAddress(s_pXInputDLL, "XInputSetState");
98    SDL_XInputGetCapabilities = (XInputGetCapabilities_t)GetProcAddress(s_pXInputDLL, "XInputGetCapabilities");
99    // 108 is the ordinal for _XInputGetCapabilitiesEx, which additionally returns VID/PID of the controller.
100    SDL_XInputGetCapabilitiesEx = (XInputGetCapabilitiesEx_t)GetProcAddress(s_pXInputDLL, (LPCSTR)108);
101    SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)GetProcAddress(s_pXInputDLL, "XInputGetBatteryInformation");
102    if (!SDL_XInputGetState || !SDL_XInputSetState || !SDL_XInputGetCapabilities) {
103        WIN_UnloadXInputDLL();
104        return false;
105    }
106
107    return true;
108}
109
110void WIN_UnloadXInputDLL(void)
111{
112    if (s_pXInputDLL) {
113        SDL_assert(s_XInputDLLRefCount > 0);
114        if (--s_XInputDLLRefCount == 0) {
115            FreeLibrary(s_pXInputDLL);
116            s_pXInputDLL = NULL;
117        }
118    } else {
119        SDL_assert(s_XInputDLLRefCount == 0);
120    }
121}
122
123#endif
124
125// Ends C function definitions when using C++
126#ifdef __cplusplus
127}
128#endif
129
[FILE END]
(C) 2025 0x4248
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