Atlas - SDL_waylanddyn.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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#if SDL_VIDEO_DRIVER_WAYLAND
24
25#define DEBUG_DYNAMIC_WAYLAND 0
26
27#include "SDL_waylanddyn.h"
28
29#if DEBUG_DYNAMIC_WAYLAND
30#include "SDL_log.h"
31#endif
32
33#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
34
35#include "SDL_name.h"
36#include "SDL_loadso.h"
37
38typedef struct
39{
40    void *lib;
41    const char *libname;
42} waylanddynlib;
43
44#ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
45#define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC NULL
46#endif
47#ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL
48#define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL NULL
49#endif
50#ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR
51#define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR NULL
52#endif
53#ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON
54#define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON NULL
55#endif
56
57static waylanddynlib waylandlibs[] = {
58    {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC},
59    {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL},
60    {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR},
61    {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON}
62};
63
64static void *
65WAYLAND_GetSym(const char *fnname, int *pHasModule)
66{
67    int i;
68    void *fn = NULL;
69    for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
70        if (waylandlibs[i].lib != NULL) {
71            fn = SDL_LoadFunction(waylandlibs[i].lib, fnname);
72            if (fn != NULL)
73                break;
74        }
75    }
76
77#if DEBUG_DYNAMIC_WAYLAND
78    if (fn != NULL)
79        SDL_Log("WAYLAND: Found '%s' in %s (%p)\n", fnname, waylandlibs[i].libname, fn);
80    else
81        SDL_Log("WAYLAND: Symbol '%s' NOT FOUND!\n", fnname);
82#endif
83
84    if (fn == NULL)
85        *pHasModule = 0;  /* kill this module. */
86
87    return fn;
88}
89
90#endif /* SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC */
91
92/* Define all the function pointers and wrappers... */
93#define SDL_WAYLAND_MODULE(modname) int SDL_WAYLAND_HAVE_##modname = 0;
94#define SDL_WAYLAND_SYM(rc,fn,params) SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL;
95#define SDL_WAYLAND_INTERFACE(iface) const struct wl_interface *WAYLAND_##iface = NULL;
96#include "SDL_waylandsym.h"
97
98static int wayland_load_refcount = 0;
99
100void
101SDL_WAYLAND_UnloadSymbols(void)
102{
103    /* Don't actually unload if more than one module is using the libs... */
104    if (wayland_load_refcount > 0) {
105        if (--wayland_load_refcount == 0) {
106#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC            
107            int i;
108#endif
109            
110            /* set all the function pointers to NULL. */
111#define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 0;
112#define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = NULL;
113#define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = NULL;
114#include "SDL_waylandsym.h"
115
116
117#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
118            for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
119                if (waylandlibs[i].lib != NULL) {
120                    SDL_UnloadObject(waylandlibs[i].lib);
121                    waylandlibs[i].lib = NULL;
122                }
123            }
124#endif
125        }
126    }
127}
128
129/* returns non-zero if all needed symbols were loaded. */
130int
131SDL_WAYLAND_LoadSymbols(void)
132{
133    int rc = 1;                 /* always succeed if not using Dynamic WAYLAND stuff. */
134
135    /* deal with multiple modules (dga, wayland, etc) needing these symbols... */
136    if (wayland_load_refcount++ == 0) {
137#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
138        int i;
139        int *thismod = NULL;
140        for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
141            if (waylandlibs[i].libname != NULL) {
142                waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname);
143            }
144        }
145
146#define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
147#include "SDL_waylandsym.h"
148
149#define SDL_WAYLAND_MODULE(modname) thismod = &SDL_WAYLAND_HAVE_##modname;
150#define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn) WAYLAND_GetSym(#fn,thismod);
151#define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = (struct wl_interface *) WAYLAND_GetSym(#iface,thismod);
152#include "SDL_waylandsym.h"
153
154        if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT) {
155            /* all required symbols loaded. */
156            SDL_ClearError();
157        } else {
158            /* in case something got loaded... */
159            SDL_WAYLAND_UnloadSymbols();
160            rc = 0;
161        }
162
163#else  /* no dynamic WAYLAND */
164
165#define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
166#define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = fn;
167#define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = &iface;
168#include "SDL_waylandsym.h"
169
170#endif
171    }
172
173    return rc;
174}
175
176#endif /* SDL_VIDEO_DRIVER_WAYLAND */
177
178/* vi: set ts=4 sw=4 expandtab: */
179
[FILE END]
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