Atlas - SDL_mirdyn.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_MIR
24
25#define DEBUG_DYNAMIC_MIR 0
26
27#include "SDL_mirdyn.h"
28
29#if DEBUG_DYNAMIC_MIR
30#include "SDL_log.h"
31#endif
32
33#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
34
35#include "SDL_name.h"
36#include "SDL_loadso.h"
37
38typedef struct
39{
40    void *lib;
41    const char *libname;
42} mirdynlib;
43
44#ifndef SDL_VIDEO_DRIVER_MIR_DYNAMIC
45#define SDL_VIDEO_DRIVER_MIR_DYNAMIC NULL
46#endif
47#ifndef SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON
48#define SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON NULL
49#endif
50
51static mirdynlib mirlibs[] = {
52    {NULL, SDL_VIDEO_DRIVER_MIR_DYNAMIC},
53    {NULL, SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON}
54};
55
56static void *
57MIR_GetSym(const char *fnname, int *pHasModule)
58{
59    int i;
60    void *fn = NULL;
61    for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
62        if (mirlibs[i].lib != NULL) {
63            fn = SDL_LoadFunction(mirlibs[i].lib, fnname);
64            if (fn != NULL)
65                break;
66        }
67    }
68
69#if DEBUG_DYNAMIC_MIR
70    if (fn != NULL)
71        SDL_Log("MIR: Found '%s' in %s (%p)\n", fnname, mirlibs[i].libname, fn);
72    else
73        SDL_Log("MIR: Symbol '%s' NOT FOUND!\n", fnname);
74#endif
75
76    if (fn == NULL)
77        *pHasModule = 0;  /* kill this module. */
78
79    return fn;
80}
81
82#endif /* SDL_VIDEO_DRIVER_MIR_DYNAMIC */
83
84/* Define all the function pointers and wrappers... */
85#define SDL_MIR_MODULE(modname) int SDL_MIR_HAVE_##modname = 0;
86#define SDL_MIR_SYM(rc,fn,params) SDL_DYNMIRFN_##fn MIR_##fn = NULL;
87#define SDL_MIR_SYM_CONST(type,name) SDL_DYMMIRCONST_##name MIR_##name = NULL;
88#include "SDL_mirsym.h"
89
90static int mir_load_refcount = 0;
91
92void
93SDL_MIR_UnloadSymbols(void)
94{
95    /* Don't actually unload if more than one module is using the libs... */
96    if (mir_load_refcount > 0) {
97        if (--mir_load_refcount == 0) {
98#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC            
99            int i;
100#endif
101            
102            /* set all the function pointers to NULL. */
103#define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 0;
104#define SDL_MIR_SYM(rc,fn,params) MIR_##fn = NULL;
105#define SDL_MIR_SYM_CONST(type,name) MIR_##name = NULL;
106#include "SDL_mirsym.h"
107
108
109#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
110            for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
111                if (mirlibs[i].lib != NULL) {
112                    SDL_UnloadObject(mirlibs[i].lib);
113                    mirlibs[i].lib = NULL;
114                }
115            }
116#endif
117        }
118    }
119}
120
121/* returns non-zero if all needed symbols were loaded. */
122int
123SDL_MIR_LoadSymbols(void)
124{
125    int rc = 1;                 /* always succeed if not using Dynamic MIR stuff. */
126
127    /* deal with multiple modules (dga, wayland, mir, etc) needing these symbols... */
128    if (mir_load_refcount++ == 0) {
129#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
130        int i;
131        int *thismod = NULL;
132        for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
133            if (mirlibs[i].libname != NULL) {
134                mirlibs[i].lib = SDL_LoadObject(mirlibs[i].libname);
135            }
136        }
137
138#define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */
139#include "SDL_mirsym.h"
140
141#define SDL_MIR_MODULE(modname) thismod = &SDL_MIR_HAVE_##modname;
142#define SDL_MIR_SYM(rc,fn,params) MIR_##fn = (SDL_DYNMIRFN_##fn) MIR_GetSym(#fn,thismod);
143#define SDL_MIR_SYM_CONST(type,name) MIR_##name = *(SDL_DYMMIRCONST_##name*) MIR_GetSym(#name,thismod);
144#include "SDL_mirsym.h"
145
146        if ((SDL_MIR_HAVE_MIR_CLIENT) && (SDL_MIR_HAVE_XKBCOMMON)) {
147            /* all required symbols loaded. */
148            SDL_ClearError();
149        } else {
150            /* in case something got loaded... */
151            SDL_MIR_UnloadSymbols();
152            rc = 0;
153        }
154
155#else  /* no dynamic MIR */
156
157#define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */
158#define SDL_MIR_SYM(rc,fn,params) MIR_##fn = fn;
159#define SDL_MIR_SYM_CONST(type,name) MIR_##name = name;
160#include "SDL_mirsym.h"
161
162#endif
163    }
164
165    return rc;
166}
167
168#endif /* SDL_VIDEO_DRIVER_MIR */
169
170/* vi: set ts=4 sw=4 expandtab: */
171
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