Atlas - SDL_waylanddyn.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#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} waylanddynlib;
75
76static waylanddynlib waylandlibs[] = {
77    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC },
78#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL
79    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL },
80#endif
81#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR
82    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR },
83#endif
84#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON
85    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON },
86#endif
87#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR
88    { NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR },
89#endif
90    { NULL, NULL }
91};
92
93static void *WAYLAND_GetSym(const char *fnname, int *pHasModule, bool required)
94{
95    void *fn = NULL;
96    waylanddynlib *dynlib;
97    for (dynlib = waylandlibs; dynlib->libname; dynlib++) {
98        if (dynlib->lib) {
99            fn = SDL_LoadFunction(dynlib->lib, fnname);
100            if (fn) {
101                break;
102            }
103        }
104    }
105
106#if DEBUG_DYNAMIC_WAYLAND
107    if (fn) {
108        SDL_Log("WAYLAND: Found '%s' in %s (%p)", fnname, dynlib->libname, fn);
109    } else {
110        SDL_Log("WAYLAND: Symbol '%s' NOT FOUND!", fnname);
111    }
112#endif
113
114    if (!fn && required) {
115        *pHasModule = 0; // kill this module.
116    }
117
118    return fn;
119}
120
121#else
122
123#include <wayland-egl.h>
124
125#endif // SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
126
127// Define all the function pointers and wrappers...
128#define SDL_WAYLAND_MODULE(modname)         int SDL_WAYLAND_HAVE_##modname = 0;
129#define SDL_WAYLAND_SYM(rc, fn, params)     SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL;
130#define SDL_WAYLAND_SYM_OPT(rc, fn, params) SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL;
131#define SDL_WAYLAND_INTERFACE(iface)        const struct wl_interface *WAYLAND_##iface = NULL;
132#include "SDL_waylandsym.h"
133
134static int wayland_load_refcount = 0;
135
136void SDL_WAYLAND_UnloadSymbols(void)
137{
138    // Don't actually unload if more than one module is using the libs...
139    if (wayland_load_refcount > 0) {
140        if (--wayland_load_refcount == 0) {
141#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
142            int i;
143#endif
144
145            // set all the function pointers to NULL.
146#define SDL_WAYLAND_MODULE(modname)         SDL_WAYLAND_HAVE_##modname = 0;
147#define SDL_WAYLAND_SYM(rc, fn, params)     WAYLAND_##fn = NULL;
148#define SDL_WAYLAND_SYM_OPT(rc, fn, params) WAYLAND_##fn = NULL;
149#define SDL_WAYLAND_INTERFACE(iface)        WAYLAND_##iface = 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                waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname);
177            }
178        }
179
180#define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; // default yes
181#include "SDL_waylandsym.h"
182
183#define SDL_WAYLAND_MODULE(modname)         thismod = &SDL_WAYLAND_HAVE_##modname;
184#define SDL_WAYLAND_SYM(rc, fn, params)     WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn)WAYLAND_GetSym(#fn, thismod, true);
185#define SDL_WAYLAND_SYM_OPT(rc, fn, params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn)WAYLAND_GetSym(#fn, thismod, false);
186#define SDL_WAYLAND_INTERFACE(iface)        WAYLAND_##iface = (struct wl_interface *)WAYLAND_GetSym(#iface, thismod, true);
187#include "SDL_waylandsym.h"
188
189        if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT &&
190            SDL_WAYLAND_HAVE_WAYLAND_CURSOR &&
191            SDL_WAYLAND_HAVE_WAYLAND_EGL &&
192            SDL_WAYLAND_HAVE_WAYLAND_XKB) {
193            // All required symbols loaded, only libdecor is optional.
194            SDL_ClearError();
195        } else {
196            // in case something got loaded...
197            SDL_WAYLAND_UnloadSymbols();
198            result = false;
199        }
200
201#else // no dynamic WAYLAND
202
203#define SDL_WAYLAND_MODULE(modname)         SDL_WAYLAND_HAVE_##modname = 1; // default yes
204#define SDL_WAYLAND_SYM(rc, fn, params)     WAYLAND_##fn = fn;
205#define SDL_WAYLAND_SYM_OPT(rc, fn, params) WAYLAND_##fn = fn;
206#define SDL_WAYLAND_INTERFACE(iface)        WAYLAND_##iface = &iface;
207#include "SDL_waylandsym.h"
208
209#endif
210    }
211
212    return result;
213}
214
215#endif // SDL_VIDEO_DRIVER_WAYLAND
216
[FILE END]
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