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annotate src/video/x11/SDL_x11dyn.c @ 2185:2032348afed1

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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is available and to keep people form having to install yet another library I have added the essential parts of Xmu in src/video/extensions/XmuStdCmap and an include file in src/video/extensions. The support makes use of standard X11 mechanisms to create color maps and make sure that an application uses the same color map for each window/visual combination. This should make it possible for gamma support to be implemented based on a single color map per application. Hurm... it looks like "make indent" modified a few extra files. Those are getting committed too.
author Bob Pendleton <bob@pendleton.com>
date Thu, 12 Jul 2007 20:00:50 +0000
parents 2c835d58faad
children c7bcf84ba1b9
rev   line source
1950
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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 #define DEBUG_DYNAMIC_X11 0
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25
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26 #include "SDL_x11dyn.h"
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27
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28 #if DEBUG_DYNAMIC_X11
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29 #include <stdio.h>
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30 #endif
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31
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32 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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33
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34 #include "SDL_name.h"
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35 #include "SDL_loadso.h"
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36
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37 typedef struct
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38 {
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39 void *lib;
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40 const char *libname;
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41 } x11dynlib;
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42
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43 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
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44 #define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
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45 #endif
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46 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
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47 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
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48 #endif
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49 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER
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50 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER NULL
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51 #endif
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52 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
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53 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
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54 #endif
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55
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56 static x11dynlib x11libs[] = {
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57 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},
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58 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT},
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59 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER},
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60 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR},
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61 };
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62
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63 static void
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64 X11_GetSym(const char *fnname, int *rc, void **fn)
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65 {
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66 int i;
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67 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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68 if (x11libs[i].lib != NULL) {
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69 *fn = SDL_LoadFunction(x11libs[i].lib, fnname);
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70 if (*fn != NULL)
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71 break;
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72 }
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73 }
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74
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75 #if DEBUG_DYNAMIC_X11
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76 if (*fn != NULL)
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77 printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname,
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78 *fn);
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79 else
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80 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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81 #endif
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82
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83 if (*fn == NULL)
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84 *rc = 0; /* kill this module. */
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85 }
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86
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87
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88 /* Define all the function pointers and wrappers... */
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89 #define SDL_X11_MODULE(modname)
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90 #define SDL_X11_SYM(rc,fn,params,args,ret) \
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91 static rc (*p##fn) params = NULL; \
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92 rc fn params { ret p##fn args ; }
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93 #include "SDL_x11sym.h"
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94 #undef SDL_X11_MODULE
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95 #undef SDL_X11_SYM
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96 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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97
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98 /* Annoying varargs entry point... */
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99 #ifdef X_HAVE_UTF8_STRING
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100 XIC(*pXCreateIC) (XIM,...) = NULL;
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101 #endif
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102
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103 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
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104 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
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105 #define SDL_X11_SYM(rc,fn,params,args,ret)
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106 #include "SDL_x11sym.h"
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107 #undef SDL_X11_MODULE
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108 #undef SDL_X11_SYM
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109
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110
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111 static int x11_load_refcount = 0;
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112
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113 void
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114 SDL_X11_UnloadSymbols(void)
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115 {
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116 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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117 /* Don't actually unload if more than one module is using the libs... */
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118 if (x11_load_refcount > 0) {
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119 if (--x11_load_refcount == 0) {
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120 int i;
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121
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122 /* set all the function pointers to NULL. */
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123 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
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124 #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
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125 #include "SDL_x11sym.h"
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126 #undef SDL_X11_MODULE
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127 #undef SDL_X11_SYM
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128
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129 #ifdef X_HAVE_UTF8_STRING
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130 pXCreateIC = NULL;
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131 #endif
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132
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133 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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134 if (x11libs[i].lib != NULL) {
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135 SDL_UnloadObject(x11libs[i].lib);
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136 x11libs[i].lib = NULL;
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137 }
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138 }
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139 }
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140 }
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141 #endif
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142 }
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143
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144 /* returns non-zero if all needed symbols were loaded. */
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145 int
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146 SDL_X11_LoadSymbols(void)
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147 {
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148 int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
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149
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150 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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151 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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152 if (x11_load_refcount++ == 0) {
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153 int i;
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154 int *thismod = NULL;
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155 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
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156 if (x11libs[i].libname != NULL) {
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157 x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
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158 }
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159 }
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160 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
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161 #define SDL_X11_SYM(a,fn,x,y,z) X11_GetSym(#fn,thismod,(void**)&p##fn);
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162 #include "SDL_x11sym.h"
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163 #undef SDL_X11_MODULE
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164 #undef SDL_X11_SYM
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165
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166 #ifdef X_HAVE_UTF8_STRING
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167 X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8, (void **) &pXCreateIC);
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168 #endif
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169
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170 if (SDL_X11_HAVE_BASEXLIB) {
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171 /* all required symbols loaded. */
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172 SDL_ClearError();
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173 } else {
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174 /* in case something got loaded... */
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175 SDL_X11_UnloadSymbols();
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176 rc = 0;
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177 }
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178 }
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179 #else
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180 #ifdef X_HAVE_UTF8_STRING
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181 pXCreateIC = XCreateIC;
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182 #endif
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183 #endif
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184
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185 return rc;
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186 }
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187
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188 /* vi: set ts=4 sw=4 expandtab: */