Atlas - SDL_kmsdrmdyn.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
22#include "SDL_internal.h"
23
24#ifdef SDL_VIDEO_DRIVER_KMSDRM
25
26#define DEBUG_DYNAMIC_KMSDRM 0
27
28#include "SDL_kmsdrmdyn.h"
29
30#ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
31
32SDL_ELF_NOTE_DLOPEN(
33    "video-kmsdrm",
34    "Support for KMSDRM",
35    SDL_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
36    SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
37)
38
39typedef struct
40{
41    void *lib;
42    const char *libname;
43} kmsdrmdynlib;
44
45#ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM
46#define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM NULL
47#endif
48
49static kmsdrmdynlib kmsdrmlibs[] = {
50    { NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM },
51    { NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC }
52};
53
54static void *KMSDRM_GetSym(const char *fnname, int *pHasModule, bool required)
55{
56    int i;
57    void *fn = NULL;
58    for (i = 0; i < SDL_arraysize(kmsdrmlibs); i++) {
59        if (kmsdrmlibs[i].lib) {
60            fn = SDL_LoadFunction(kmsdrmlibs[i].lib, fnname);
61            if (fn) {
62                break;
63            }
64        }
65    }
66
67#if DEBUG_DYNAMIC_KMSDRM
68    if (fn)
69        SDL_Log("KMSDRM: Found '%s' in %s (%p)", fnname, kmsdrmlibs[i].libname, fn);
70    else
71        SDL_Log("KMSDRM: Symbol '%s' NOT FOUND!", fnname);
72#endif
73
74    if (!fn && required) {
75        *pHasModule = 0; // kill this module.
76    }
77
78    return fn;
79}
80
81#endif // SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
82
83// Define all the function pointers and wrappers...
84#define SDL_KMSDRM_MODULE(modname)          int SDL_KMSDRM_HAVE_##modname = 0;
85#define SDL_KMSDRM_SYM(rc, fn, params)      SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
86#define SDL_KMSDRM_SYM_CONST(type, name)    SDL_DYNKMSDRMCONST_##name KMSDRM_##name = NULL;
87#define SDL_KMSDRM_SYM_OPT(rc, fn, params)  SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
88#include "SDL_kmsdrmsym.h"
89
90static int kmsdrm_load_refcount = 0;
91
92void SDL_KMSDRM_UnloadSymbols(void)
93{
94    // Don't actually unload if more than one module is using the libs...
95    if (kmsdrm_load_refcount > 0) {
96        if (--kmsdrm_load_refcount == 0) {
97#ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
98            int i;
99#endif
100
101            // set all the function pointers to NULL.
102#define SDL_KMSDRM_MODULE(modname)          SDL_KMSDRM_HAVE_##modname = 0;
103#define SDL_KMSDRM_SYM(rc, fn, params)      KMSDRM_##fn = NULL;
104#define SDL_KMSDRM_SYM_CONST(type, name)    KMSDRM_##name = NULL;
105#define SDL_KMSDRM_SYM_OPT(rc, fn, params)  KMSDRM_##fn = NULL;
106#include "SDL_kmsdrmsym.h"
107
108#ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
109            for (i = 0; i < SDL_arraysize(kmsdrmlibs); i++) {
110                if (kmsdrmlibs[i].lib) {
111                    SDL_UnloadObject(kmsdrmlibs[i].lib);
112                    kmsdrmlibs[i].lib = NULL;
113                }
114            }
115#endif
116        }
117    }
118}
119
120// returns non-zero if all needed symbols were loaded.
121bool SDL_KMSDRM_LoadSymbols(void)
122{
123    bool result = true; // always succeed if not using Dynamic KMSDRM stuff.
124
125    // deal with multiple modules needing these symbols...
126    if (kmsdrm_load_refcount++ == 0) {
127#ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
128        int i;
129        int *thismod = NULL;
130        for (i = 0; i < SDL_arraysize(kmsdrmlibs); i++) {
131            if (kmsdrmlibs[i].libname) {
132                kmsdrmlibs[i].lib = SDL_LoadObject(kmsdrmlibs[i].libname);
133            }
134        }
135
136#define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; // default yes
137#include "SDL_kmsdrmsym.h"
138
139#define SDL_KMSDRM_MODULE(modname)          thismod = &SDL_KMSDRM_HAVE_##modname;
140#define SDL_KMSDRM_SYM(rc, fn, params)      KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn)KMSDRM_GetSym(#fn, thismod, true);
141#define SDL_KMSDRM_SYM_CONST(type, name)    KMSDRM_##name = *(SDL_DYNKMSDRMCONST_##name *)KMSDRM_GetSym(#name, thismod, true);
142#define SDL_KMSDRM_SYM_OPT(rc, fn, params)  KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn)KMSDRM_GetSym(#fn, thismod, false);
143#include "SDL_kmsdrmsym.h"
144
145        if ((SDL_KMSDRM_HAVE_LIBDRM) && (SDL_KMSDRM_HAVE_GBM)) {
146            // all required symbols loaded.
147            SDL_ClearError();
148        } else {
149            // in case something got loaded...
150            SDL_KMSDRM_UnloadSymbols();
151            result = false;
152        }
153
154#else // no dynamic KMSDRM
155
156#define SDL_KMSDRM_MODULE(modname)          SDL_KMSDRM_HAVE_##modname = 1; // default yes
157#define SDL_KMSDRM_SYM(rc, fn, params)      KMSDRM_##fn = fn;
158#define SDL_KMSDRM_SYM_CONST(type, name)    KMSDRM_##name = name;
159#define SDL_KMSDRM_SYM_OPT(rc, fn, params)  KMSDRM_##fn = fn;
160#include "SDL_kmsdrmsym.h"
161
162#endif
163    }
164
165    return result;
166}
167
168#endif // SDL_VIDEO_DRIVER_KMSDRM
169
[FILE END]
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