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annotate src/video/directfb/SDL_DirectFB_dyn.c @ 5145:c8e049de174c

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Making the API simpler, the renderer present semantics are always having a backbuffer and then discarding it. This is best for hardware accelerated rendering.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 01 Feb 2011 12:19:46 -0800
parents b196d2758026
children 164f20ba08eb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 #include "SDL_DirectFB_video.h"
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25 #include "SDL_DirectFB_dyn.h"
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26
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27 #ifdef SDL_VIDEO_DRIVER_DIRECTFB_DYNAMIC
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28 #include "SDL_name.h"
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29 #include "SDL_loadso.h"
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30
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31 #define DFB_SYM(ret, name, args, al, func) ret (*name) args;
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32 static struct _SDL_DirectFB_Symbols
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33 {
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34 DFB_SYMS
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35 const unsigned int *directfb_major_version;
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36 const unsigned int *directfb_minor_version;
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37 const unsigned int *directfb_micro_version;
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38 } SDL_DirectFB_Symbols;
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39 #undef DFB_SYM
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40
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41 #define DFB_SYM(ret, name, args, al, func) ret name args { func SDL_DirectFB_Symbols.name al ; }
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42 DFB_SYMS
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43 #undef DFB_SYM
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44 static void *handle = NULL;
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45
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46 int
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47 SDL_DirectFB_LoadLibrary(void)
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48 {
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49 int retval = 0;
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50
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51 if (handle == NULL) {
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52 handle = SDL_LoadObject(SDL_VIDEO_DRIVER_DIRECTFB_DYNAMIC);
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53 if (handle != NULL) {
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54 retval = 1;
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55 #define DFB_SYM(ret, name, args, al, func) if (!(SDL_DirectFB_Symbols.name = SDL_LoadFunction(handle, # name))) retval = 0;
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56 DFB_SYMS
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57 #undef DFB_SYM
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58 if (!
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59 (SDL_DirectFB_Symbols.directfb_major_version =
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60 SDL_LoadFunction(handle, "directfb_major_version")))
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61 retval = 0;
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62 if (!
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63 (SDL_DirectFB_Symbols.directfb_minor_version =
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64 SDL_LoadFunction(handle, "directfb_minor_version")))
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65 retval = 0;
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66 if (!
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67 (SDL_DirectFB_Symbols.directfb_micro_version =
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68 SDL_LoadFunction(handle, "directfb_micro_version")))
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69 retval = 0;
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70 }
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71 }
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72 if (retval) {
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73 const char *stemp = DirectFBCheckVersion(DIRECTFB_MAJOR_VERSION,
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74 DIRECTFB_MINOR_VERSION,
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75 DIRECTFB_MICRO_VERSION);
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76 /* Version Check */
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77 if (stemp != NULL) {
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78 fprintf(stderr,
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79 "DirectFB Lib: Version mismatch. Compiled: %d.%d.%d Library %d.%d.%d\n",
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80 DIRECTFB_MAJOR_VERSION, DIRECTFB_MINOR_VERSION,
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81 DIRECTFB_MICRO_VERSION,
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82 *SDL_DirectFB_Symbols.directfb_major_version,
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83 *SDL_DirectFB_Symbols.directfb_minor_version,
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84 *SDL_DirectFB_Symbols.directfb_micro_version);
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85 retval = 0;
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86 }
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87 }
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88 if (!retval)
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89 SDL_DirectFB_UnLoadLibrary();
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90 return retval;
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91 }
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92
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93 void
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94 SDL_DirectFB_UnLoadLibrary(void)
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95 {
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96 if (handle != NULL) {
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97 SDL_UnloadObject(handle);
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98 handle = NULL;
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99 }
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100 }
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101
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102 #else
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103 int
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104 SDL_DirectFB_LoadLibrary(void)
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105 {
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106 return 1;
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107 }
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108
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109 void
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110 SDL_DirectFB_UnLoadLibrary(void)
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111 {
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112 }
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113 #endif