Atlas - SDL_x11dyn.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_X11
24
25#define DEBUG_DYNAMIC_X11 0
26
27#include "SDL_x11dyn.h"
28
29#if DEBUG_DYNAMIC_X11
30#include <stdio.h>
31#endif
32
33#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
34
35#include "SDL_name.h"
36#include "SDL_loadso.h"
37
38typedef struct
39{
40    void *lib;
41    const char *libname;
42} x11dynlib;
43
44#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
45#define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
46#endif
47#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
48#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
49#endif
50#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR
51#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR NULL
52#endif
53#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
54#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA NULL
55#endif
56#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
57#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 NULL
58#endif
59#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
60#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
61#endif
62#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
63#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
64#endif
65#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
66#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE NULL
67#endif
68
69static x11dynlib x11libs[] = {
70    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},
71    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT},
72    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR},
73    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA},
74    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2},
75    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR},
76    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS},
77    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE}
78};
79
80static void *
81X11_GetSym(const char *fnname, int *pHasModule)
82{
83    int i;
84    void *fn = NULL;
85    for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
86        if (x11libs[i].lib != NULL) {
87            fn = SDL_LoadFunction(x11libs[i].lib, fnname);
88            if (fn != NULL)
89                break;
90        }
91    }
92
93#if DEBUG_DYNAMIC_X11
94    if (fn != NULL)
95        printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, fn);
96    else
97        printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
98#endif
99
100    if (fn == NULL)
101        *pHasModule = 0;  /* kill this module. */
102
103    return fn;
104}
105
106#endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
107
108/* Define all the function pointers and wrappers... */
109#define SDL_X11_SYM(rc,fn,params,args,ret) SDL_DYNX11FN_##fn X11_##fn = NULL;
110#include "SDL_x11sym.h"
111
112/* Annoying varargs entry point... */
113#ifdef X_HAVE_UTF8_STRING
114SDL_DYNX11FN_XCreateIC X11_XCreateIC = NULL;
115SDL_DYNX11FN_XGetICValues X11_XGetICValues = NULL;
116#endif
117
118/* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
119#define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 0;
120#include "SDL_x11sym.h"
121
122static int x11_load_refcount = 0;
123
124void
125SDL_X11_UnloadSymbols(void)
126{
127    /* Don't actually unload if more than one module is using the libs... */
128    if (x11_load_refcount > 0) {
129        if (--x11_load_refcount == 0) {
130            int i;
131
132            /* set all the function pointers to NULL. */
133#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 0;
134#define SDL_X11_SYM(rc,fn,params,args,ret) X11_##fn = NULL;
135#include "SDL_x11sym.h"
136
137#ifdef X_HAVE_UTF8_STRING
138            X11_XCreateIC = NULL;
139            X11_XGetICValues = NULL;
140#endif
141
142#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
143            for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
144                if (x11libs[i].lib != NULL) {
145                    SDL_UnloadObject(x11libs[i].lib);
146                    x11libs[i].lib = NULL;
147                }
148            }
149#endif
150        }
151    }
152}
153
154/* returns non-zero if all needed symbols were loaded. */
155int
156SDL_X11_LoadSymbols(void)
157{
158    int rc = 1;                 /* always succeed if not using Dynamic X11 stuff. */
159
160    /* deal with multiple modules (dga, x11, etc) needing these symbols... */
161    if (x11_load_refcount++ == 0) {
162#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
163        int i;
164        int *thismod = NULL;
165        for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
166            if (x11libs[i].libname != NULL) {
167                x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
168            }
169        }
170
171#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
172#include "SDL_x11sym.h"
173
174#define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
175#define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) X11_GetSym(#fn,thismod);
176#include "SDL_x11sym.h"
177
178#ifdef X_HAVE_UTF8_STRING
179        X11_XCreateIC = (SDL_DYNX11FN_XCreateIC)
180                        X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8);
181        X11_XGetICValues = (SDL_DYNX11FN_XGetICValues)
182                        X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8);
183#endif
184
185        if (SDL_X11_HAVE_BASEXLIB) {
186            /* all required symbols loaded. */
187            SDL_ClearError();
188        } else {
189            /* in case something got loaded... */
190            SDL_X11_UnloadSymbols();
191            rc = 0;
192        }
193
194#else  /* no dynamic X11 */
195
196#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
197#define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) fn;
198#include "SDL_x11sym.h"
199
200#ifdef X_HAVE_UTF8_STRING
201        X11_XCreateIC = XCreateIC;
202        X11_XGetICValues = XGetICValues;
203#endif
204#endif
205    }
206
207    return rc;
208}
209
210#endif /* SDL_VIDEO_DRIVER_X11 */
211
212/* vi: set ts=4 sw=4 expandtab: */
213
[FILE END]
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