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annotate src/video/x11/SDL_x11dyn.c @ 1538:b1f8c14f0df5

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 03:50:34 +0000
parents d910939febfa
children 3ba88cb7eb1b
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #if 0
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25 #define DEBUG_DYNAMIC_X11 1
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26 #endif
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27
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28 #define __SDL_NO_REDEFINE_X11_HEADER_SYMS 1
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29 #include "SDL_x11dyn.h"
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30
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31 #ifdef DEBUG_DYNAMIC_X11
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32 #include <stdio.h>
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33 #endif
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34
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35 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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36 #include <dlfcn.h>
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37 #include "SDL_name.h"
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38 #include "SDL_loadso.h"
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39 static const char *x11_library = SDL_VIDEO_DRIVER_X11_DYNAMIC;
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40 static void *x11_handle = NULL;
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41 static const char *x11ext_library = SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT;
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42 static void *x11ext_handle = NULL;
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43
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44 static void *X11_GetSym(int required, const char *fnname, int *rc)
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45 {
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46 void *fn = NULL;
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47 if (*rc) { /* haven't already failed on a previous lookup? */
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48 fn = SDL_LoadFunction(x11_handle, fnname);
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49 #if DEBUG_DYNAMIC_X11
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50 if (fn != NULL)
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51 printf("X11: Found '%s' in libX11 (%p)\n", fnname, fn);
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52 #endif
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53
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54 if (fn == NULL) { /* not found? Check libX11ext ... */
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55 fn = SDL_LoadFunction(x11ext_handle, fnname);
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56 #if DEBUG_DYNAMIC_X11
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57 if (fn != NULL)
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58 printf("X11: Found '%s' in libXext (%p)\n", fnname, fn);
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59 else
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60 printf("X11: Symbol '%s' NOT FOUND!%s\n", fnname,
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61 required ? "" : " (...but not required!)");
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62 #endif
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63 }
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64 *rc = ((fn != NULL) || (!required));
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65 }
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66
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67 return fn;
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68 }
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69 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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70
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71 /* Define all the function pointers... */
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72 #define SDL_X11_SYM(req,ret,fn,params) ret (*p##fn) params = NULL;
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73 #include "SDL_x11sym.h"
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74 #undef SDL_X11_SYM
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75
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76 static int x11_load_refcount = 0;
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77
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78 void SDL_X11_UnloadSymbols(void)
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79 {
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80 /* Don't actually unload if more than one module is using the libs... */
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81 if (x11_load_refcount > 0) {
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82 if (--x11_load_refcount == 0) {
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83 /* set all the function pointers to NULL. */
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84 #define SDL_X11_SYM(req,ret,fn,params) p##fn = NULL;
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85 #include "SDL_x11sym.h"
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86 #undef SDL_X11_SYM
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87
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88 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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89 if (x11_handle != NULL) {
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90 SDL_UnloadObject(x11_handle);
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91 x11_handle = NULL;
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92 }
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93 if (x11ext_handle != NULL) {
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94 SDL_UnloadObject(x11ext_handle);
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95 x11ext_handle = NULL;
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96 }
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97 #endif
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98 }
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99 }
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100 }
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101
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102 /* returns non-zero if all needed symbols were loaded. */
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103 int SDL_X11_LoadSymbols(void)
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104 {
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105 int rc = 1;
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106
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107 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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108 if (x11_load_refcount++ == 0) {
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109 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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110 x11_handle = SDL_LoadObject(x11_library);
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111 x11ext_handle = SDL_LoadObject(x11ext_library);
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112 rc = ((x11_handle != NULL) && (x11ext_handle != NULL));
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113 #define SDL_X11_SYM(req,r,fn,arg) p##fn = X11_GetSym(req,#fn, &rc);
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114 #include "SDL_x11sym.h"
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115 #undef SDL_X11_SYM
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116
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117 if (!rc)
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118 SDL_X11_UnloadSymbols(); /* in case one of these loaded... */
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119
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120 #else
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121 #define SDL_X11_SYM(req,r,fn,arg) p##fn = fn;
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122 #include "SDL_x11sym.h"
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123 #undef SDL_X11_SYM
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124 #endif
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125 }
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126
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127 return rc;
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128 }
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129
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130 /* end of SDL_x11dyn.c ... */
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131