1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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
32typedef struct
33{
34 void *lib;
35 const char *libname;
36} kmsdrmdynlib;
37
38#ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM
39#define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM NULL
40#endif
41
42static kmsdrmdynlib kmsdrmlibs[] = {
43 { NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM },
44 { NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC }
45};
46
47static void *KMSDRM_GetSym(const char *fnname, int *pHasModule, bool required)
48{
49 int i;
50 void *fn = NULL;
51 for (i = 0; i < SDL_arraysize(kmsdrmlibs); i++) {
52 if (kmsdrmlibs[i].lib) {
53 fn = SDL_LoadFunction(kmsdrmlibs[i].lib, fnname);
54 if (fn) {
55 break;
56 }
57 }
58 }
59
60#if DEBUG_DYNAMIC_KMSDRM
61 if (fn)
62 SDL_Log("KMSDRM: Found '%s' in %s (%p)", fnname, kmsdrmlibs[i].libname, fn);
63 else
64 SDL_Log("KMSDRM: Symbol '%s' NOT FOUND!", fnname);
65#endif
66
67 if (!fn && required) {
68 *pHasModule = 0; // kill this module.
69 }
70
71 return fn;
72}
73
74#endif // SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
75
76// Define all the function pointers and wrappers...
77#define SDL_KMSDRM_MODULE(modname) int SDL_KMSDRM_HAVE_##modname = 0;
78#define SDL_KMSDRM_SYM(rc, fn, params) SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
79#define SDL_KMSDRM_SYM_CONST(type, name) SDL_DYNKMSDRMCONST_##name KMSDRM_##name = NULL;
80#define SDL_KMSDRM_SYM_OPT(rc, fn, params) SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
81#include "SDL_kmsdrmsym.h"
82
83static int kmsdrm_load_refcount = 0;
84
85void SDL_KMSDRM_UnloadSymbols(void)
86{
87 // Don't actually unload if more than one module is using the libs...
88 if (kmsdrm_load_refcount > 0) {
89 if (--kmsdrm_load_refcount == 0) {
90#ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
91 int i;
92#endif
93
94 // set all the function pointers to NULL.
95#define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 0;
96#define SDL_KMSDRM_SYM(rc, fn, params) KMSDRM_##fn = NULL;
97#define SDL_KMSDRM_SYM_CONST(type, name) KMSDRM_##name = NULL;
98#define SDL_KMSDRM_SYM_OPT(rc, fn, params) KMSDRM_##fn = NULL;
99#include "SDL_kmsdrmsym.h"
100
101#ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
102 for (i = 0; i < SDL_arraysize(kmsdrmlibs); i++) {
103 if (kmsdrmlibs[i].lib) {
104 SDL_UnloadObject(kmsdrmlibs[i].lib);
105 kmsdrmlibs[i].lib = NULL;
106 }
107 }
108#endif
109 }
110 }
111}
112
113// returns non-zero if all needed symbols were loaded.
114bool SDL_KMSDRM_LoadSymbols(void)
115{
116 bool result = true; // always succeed if not using Dynamic KMSDRM stuff.
117
118 // deal with multiple modules needing these symbols...
119 if (kmsdrm_load_refcount++ == 0) {
120#ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
121 int i;
122 int *thismod = NULL;
123 for (i = 0; i < SDL_arraysize(kmsdrmlibs); i++) {
124 if (kmsdrmlibs[i].libname) {
125 kmsdrmlibs[i].lib = SDL_LoadObject(kmsdrmlibs[i].libname);
126 }
127 }
128
129#define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; // default yes
130#include "SDL_kmsdrmsym.h"
131
132#define SDL_KMSDRM_MODULE(modname) thismod = &SDL_KMSDRM_HAVE_##modname;
133#define SDL_KMSDRM_SYM(rc, fn, params) KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn)KMSDRM_GetSym(#fn, thismod, true);
134#define SDL_KMSDRM_SYM_CONST(type, name) KMSDRM_##name = *(SDL_DYNKMSDRMCONST_##name *)KMSDRM_GetSym(#name, thismod, true);
135#define SDL_KMSDRM_SYM_OPT(rc, fn, params) KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn)KMSDRM_GetSym(#fn, thismod, false);
136#include "SDL_kmsdrmsym.h"
137
138 if ((SDL_KMSDRM_HAVE_LIBDRM) && (SDL_KMSDRM_HAVE_GBM)) {
139 // all required symbols loaded.
140 SDL_ClearError();
141 } else {
142 // in case something got loaded...
143 SDL_KMSDRM_UnloadSymbols();
144 result = false;
145 }
146
147#else // no dynamic KMSDRM
148
149#define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; // default yes
150#define SDL_KMSDRM_SYM(rc, fn, params) KMSDRM_##fn = fn;
151#define SDL_KMSDRM_SYM_CONST(type, name) KMSDRM_##name = name;
152#define SDL_KMSDRM_SYM_OPT(rc, fn, params) KMSDRM_##fn = fn;
153#include "SDL_kmsdrmsym.h"
154
155#endif
156 }
157
158 return result;
159}
160
161#endif // SDL_VIDEO_DRIVER_KMSDRM
162