Atlas - SDL_waylanddyn.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2026 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#ifdef SDL_VIDEO_DRIVER_WAYLAND
24
25#define DEBUG_DYNAMIC_WAYLAND 0
26
27#include "SDL_waylanddyn.h"
28
29#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
30
31SDL_ELF_NOTE_DLOPEN(
32    "wayland",
33    "Support for Wayland video",
34    SDL_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
35    SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
36)
37#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL
38SDL_ELF_NOTE_DLOPEN(
39    "wayland",
40    "Support for Wayland video",
41    SDL_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
42    SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL
43)
44#endif
45#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR
46SDL_ELF_NOTE_DLOPEN(
47    "wayland",
48    "Support for Wayland video",
49    SDL_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
50    SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR
51)
52#endif
53#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON
54SDL_ELF_NOTE_DLOPEN(
55    "wayland",
56    "Support for Wayland video",
57    SDL_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
58    SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON
59)
60#endif
61#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR
62SDL_ELF_NOTE_DLOPEN(
63    "wayland",
64    "Support for Wayland video",
65    SDL_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
66    SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR
67)
68#endif
69
70typedef struct
71{
72    SDL_SharedObject *lib;
73    const char *libname;
74    const char *hint;
75    bool hint_default;
76} waylanddynlib;
77
78static waylanddynlib waylandlibs[] = {
79    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC, NULL, false },
80#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL
81    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL, NULL, false },
82#endif
83#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR
84    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR, NULL, false },
85#endif
86#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON
87    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON, NULL, false },
88#endif
89#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR
90    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR, SDL_HINT_VIDEO_WAYLAND_ALLOW_LIBDECOR, true },
91#endif
92    { NULL, NULL, NULL, false }
93};
94
95static void *WAYLAND_GetSym(const char *fnname, int *pHasModule, bool required)
96{
97    void *fn = NULL;
98    waylanddynlib *dynlib;
99    for (dynlib = waylandlibs; dynlib->libname; dynlib++) {
100        if (dynlib->lib) {
101            fn = SDL_LoadFunction(dynlib->lib, fnname);
102            if (fn) {
103                break;
104            }
105        }
106    }
107
108#if DEBUG_DYNAMIC_WAYLAND
109    if (fn) {
110        SDL_Log("WAYLAND: Found '%s' in %s (%p)", fnname, dynlib->libname, fn);
111    } else {
112        SDL_Log("WAYLAND: Symbol '%s' NOT FOUND!", fnname);
113    }
114#endif
115
116    if (!fn && required) {
117        *pHasModule = 0; // kill this module.
118    }
119
120    return fn;
121}
122
123#else
124
125#include <wayland-egl.h>
126
127#endif // SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
128
129// Define all the function pointers and wrappers...
130#define SDL_WAYLAND_MODULE(modname)         int SDL_WAYLAND_HAVE_##modname = 0;
131#define SDL_WAYLAND_SYM(rc, fn, params)     SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL;
132#define SDL_WAYLAND_SYM_OPT(rc, fn, params) SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL;
133#include "SDL_waylandsym.h"
134
135static int wayland_load_refcount = 0;
136
137void SDL_WAYLAND_UnloadSymbols(void)
138{
139    // Don't actually unload if more than one module is using the libs...
140    if (wayland_load_refcount > 0) {
141        if (--wayland_load_refcount == 0) {
142#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
143            int i;
144#endif
145
146            // set all the function pointers to NULL.
147#define SDL_WAYLAND_MODULE(modname)         SDL_WAYLAND_HAVE_##modname = 0;
148#define SDL_WAYLAND_SYM(rc, fn, params)     WAYLAND_##fn = NULL;
149#define SDL_WAYLAND_SYM_OPT(rc, fn, params) WAYLAND_##fn = NULL;
150#include "SDL_waylandsym.h"
151
152#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
153            for (i = 0; i < SDL_arraysize(waylandlibs); i++) {
154                if (waylandlibs[i].lib) {
155                    SDL_UnloadObject(waylandlibs[i].lib);
156                    waylandlibs[i].lib = NULL;
157                }
158            }
159#endif
160        }
161    }
162}
163
164// returns non-zero if all needed symbols were loaded.
165bool SDL_WAYLAND_LoadSymbols(void)
166{
167    bool result = true; // always succeed if not using Dynamic WAYLAND stuff.
168
169    // deal with multiple modules (dga, wayland, etc) needing these symbols...
170    if (wayland_load_refcount++ == 0) {
171#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
172        int i;
173        int *thismod = NULL;
174        for (i = 0; i < SDL_arraysize(waylandlibs); i++) {
175            if (waylandlibs[i].libname) {
176                if (waylandlibs[i].hint &&
177                    !SDL_GetHintBoolean(waylandlibs[i].hint, waylandlibs[i].hint_default)) {
178                    continue;
179                }
180                waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname);
181            }
182        }
183
184#define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; // default yes
185#include "SDL_waylandsym.h"
186
187#define SDL_WAYLAND_MODULE(modname)         thismod = &SDL_WAYLAND_HAVE_##modname;
188#define SDL_WAYLAND_SYM(rc, fn, params)     WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn)WAYLAND_GetSym(#fn, thismod, true);
189#define SDL_WAYLAND_SYM_OPT(rc, fn, params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn)WAYLAND_GetSym(#fn, thismod, false);
190#include "SDL_waylandsym.h"
191
192        if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT &&
193            SDL_WAYLAND_HAVE_WAYLAND_CURSOR &&
194            SDL_WAYLAND_HAVE_WAYLAND_EGL &&
195            SDL_WAYLAND_HAVE_WAYLAND_XKB) {
196            // All required symbols loaded, only libdecor is optional.
197            SDL_ClearError();
198        } else {
199            // in case something got loaded...
200            SDL_WAYLAND_UnloadSymbols();
201            result = false;
202        }
203
204#else // no dynamic WAYLAND
205
206#define SDL_WAYLAND_MODULE(modname)         SDL_WAYLAND_HAVE_##modname = 1; // default yes
207#define SDL_WAYLAND_SYM(rc, fn, params)     WAYLAND_##fn = fn;
208#define SDL_WAYLAND_SYM_OPT(rc, fn, params) WAYLAND_##fn = fn;
209#include "SDL_waylandsym.h"
210
211#endif
212    }
213
214    return result;
215}
216
217#endif // SDL_VIDEO_DRIVER_WAYLAND
218
[FILE END]
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