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 #include "SDL_assert.h"
24 #include "SDL_xinput.h"
25
26
27 #ifdef HAVE_XINPUT_H
28
29 XInputGetState_t SDL_XInputGetState = NULL;
30 XInputSetState_t SDL_XInputSetState = NULL;
31 XInputGetCapabilities_t SDL_XInputGetCapabilities = NULL;
32 XInputGetBatteryInformation_t SDL_XInputGetBatteryInformation = NULL;
33 DWORD SDL_XInputVersion = 0;
34
35 static HANDLE s_pXInputDLL = 0;
36 static int s_XInputDLLRefCount = 0;
37
38
39 #ifdef __WINRT__
40
41 int
WIN_LoadXInputDLL(void)42 WIN_LoadXInputDLL(void)
43 {
44 /* Getting handles to system dlls (via LoadLibrary and its variants) is not
45 * supported on WinRT, thus, pointers to XInput's functions can't be
46 * retrieved via GetProcAddress.
47 *
48 * When on WinRT, assume that XInput is already loaded, and directly map
49 * its XInput.h-declared functions to the SDL_XInput* set of function
50 * pointers.
51 *
52 * Side-note: XInputGetStateEx is not available for use in WinRT.
53 * This seems to mean that support for the guide button is not available
54 * in WinRT, unfortunately.
55 */
56 SDL_XInputGetState = (XInputGetState_t)XInputGetState;
57 SDL_XInputSetState = (XInputSetState_t)XInputSetState;
58 SDL_XInputGetCapabilities = (XInputGetCapabilities_t)XInputGetCapabilities;
59 SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)XInputGetBatteryInformation;
60
61 /* XInput 1.4 ships with Windows 8 and 8.1: */
62 SDL_XInputVersion = (1 << 16) | 4;
63
64 return 0;
65 }
66
67 void
WIN_UnloadXInputDLL(void)68 WIN_UnloadXInputDLL(void)
69 {
70 }
71
72 #else /* !__WINRT__ */
73
74 int
WIN_LoadXInputDLL(void)75 WIN_LoadXInputDLL(void)
76 {
77 DWORD version = 0;
78
79 if (s_pXInputDLL) {
80 SDL_assert(s_XInputDLLRefCount > 0);
81 s_XInputDLLRefCount++;
82 return 0; /* already loaded */
83 }
84
85 version = (1 << 16) | 4;
86 s_pXInputDLL = LoadLibrary(L"XInput1_4.dll"); /* 1.4 Ships with Windows 8. */
87 if (!s_pXInputDLL) {
88 version = (1 << 16) | 3;
89 s_pXInputDLL = LoadLibrary(L"XInput1_3.dll"); /* 1.3 can be installed as a redistributable component. */
90 }
91 if (!s_pXInputDLL) {
92 s_pXInputDLL = LoadLibrary(L"bin\\XInput1_3.dll");
93 }
94 if (!s_pXInputDLL) {
95 /* "9.1.0" Ships with Vista and Win7, and is more limited than 1.3+ (e.g. XInputGetStateEx is not available.) */
96 s_pXInputDLL = LoadLibrary(L"XInput9_1_0.dll");
97 }
98 if (!s_pXInputDLL) {
99 return -1;
100 }
101
102 SDL_assert(s_XInputDLLRefCount == 0);
103 SDL_XInputVersion = version;
104 s_XInputDLLRefCount = 1;
105
106 /* 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... */
107 SDL_XInputGetState = (XInputGetState_t)GetProcAddress((HMODULE)s_pXInputDLL, (LPCSTR)100);
108 if (!SDL_XInputGetState) {
109 SDL_XInputGetState = (XInputGetState_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputGetState");
110 }
111 SDL_XInputSetState = (XInputSetState_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputSetState");
112 SDL_XInputGetCapabilities = (XInputGetCapabilities_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputGetCapabilities");
113 SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)GetProcAddress( (HMODULE)s_pXInputDLL, "XInputGetBatteryInformation" );
114 if (!SDL_XInputGetState || !SDL_XInputSetState || !SDL_XInputGetCapabilities) {
115 WIN_UnloadXInputDLL();
116 return -1;
117 }
118
119 return 0;
120 }
121
122 void
WIN_UnloadXInputDLL(void)123 WIN_UnloadXInputDLL(void)
124 {
125 if (s_pXInputDLL) {
126 SDL_assert(s_XInputDLLRefCount > 0);
127 if (--s_XInputDLLRefCount == 0) {
128 FreeLibrary(s_pXInputDLL);
129 s_pXInputDLL = NULL;
130 }
131 } else {
132 SDL_assert(s_XInputDLLRefCount == 0);
133 }
134 }
135
136 #endif /* __WINRT__ */
137 #endif /* HAVE_XINPUT_H */
138
139 /* vi: set ts=4 sw=4 expandtab: */
140