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  1. /*
  2. * libcaca Colour ASCII-Art library
  3. * Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
  4. * All Rights Reserved
  5. *
  6. * $Id$
  7. *
  8. * This library is free software; you can redistribute it and/or
  9. * modify it under the terms of the Do What The Fuck You Want To
  10. * Public License, Version 2, as published by Sam Hocevar. See
  11. * http://sam.zoy.org/wtfpl/COPYING for more details.
  12. */
  13. /*
  14. * This file contains the main functions used by \e libcaca applications to
  15. * initialise the library, get the screen properties, set the framerate and
  16. * so on.
  17. */
  18. #include "config.h"
  19. #include "common.h"
  20. #if !defined(__KERNEL__)
  21. # include <stdlib.h>
  22. # include <string.h>
  23. # include <stdio.h>
  24. # if defined(USE_PLUGINS)
  25. # if defined(HAVE_DLFCN_H)
  26. # include <dlfcn.h>
  27. # endif
  28. # endif
  29. #endif
  30. #include "cucul.h"
  31. #include "cucul_internals.h"
  32. #include "caca.h"
  33. #include "caca_internals.h"
  34. #if defined(USE_PLUGINS)
  35. # define gl_install(p) caca_plugin_install("gl", p)
  36. # define x11_install(p) caca_plugin_install("x11", p)
  37. #endif
  38. static int caca_select_driver(caca_display_t *);
  39. #if defined(USE_PLUGINS)
  40. static int caca_plugin_install(char const *, caca_display_t *);
  41. #endif
  42. /** \brief Attach a caca graphical context to a cucul canvas.
  43. *
  44. * Create a graphical context using device-dependent features (ncurses for
  45. * terminals, an X11 window, a DOS command window...) that attaches to a
  46. * libcucul canvas. Everything that gets drawn in the libcucul canvas can
  47. * then be displayed by the libcaca driver.
  48. *
  49. * If an error occurs, NULL is returned and \b errno is set accordingly:
  50. * - \c ENOMEM Not enough memory.
  51. * - \c ENODEV Graphical device could not be initialised.
  52. *
  53. * \param cv The cucul cavas.
  54. * \return The caca graphical context or NULL if an error occurred.
  55. */
  56. caca_display_t * caca_create_display(cucul_canvas_t * cv)
  57. {
  58. caca_display_t *dp = malloc(sizeof(caca_display_t));
  59. if(!dp)
  60. {
  61. seterrno(ENOMEM);
  62. return NULL;
  63. }
  64. dp->cv = cv;
  65. #if defined(USE_PLUGINS)
  66. dp->plugin = NULL;
  67. #endif
  68. if(caca_select_driver(dp))
  69. {
  70. #if defined(USE_PLUGINS)
  71. if(dp->plugin)
  72. dlclose(dp->plugin);
  73. #endif
  74. free(dp);
  75. seterrno(ENODEV);
  76. return NULL;
  77. }
  78. if(dp->drv.init_graphics(dp))
  79. {
  80. #if defined(USE_PLUGINS)
  81. if(dp->plugin)
  82. dlclose(dp->plugin);
  83. #endif
  84. free(dp);
  85. seterrno(ENODEV);
  86. return NULL;
  87. }
  88. /* Attached! */
  89. dp->cv->refcount++;
  90. /* Graphics stuff */
  91. dp->delay = 0;
  92. dp->rendertime = 0;
  93. /* Events stuff */
  94. #if defined(USE_SLANG) || defined(USE_NCURSES)
  95. dp->events.key_timer.last_sec = 0;
  96. dp->events.key_timer.last_usec = 0;
  97. dp->events.last_key_ticks = 0;
  98. dp->events.autorepeat_ticks = 0;
  99. dp->events.last_key_event.type = CACA_EVENT_NONE;
  100. #endif
  101. #if defined(USE_SLANG) || defined(USE_NCURSES) || defined(USE_CONIO) || defined(USE_GL)
  102. dp->events.queue = 0;
  103. #endif
  104. dp->timer.last_sec = 0;
  105. dp->timer.last_usec = 0;
  106. dp->lastticks = 0;
  107. /* Mouse position */
  108. dp->mouse.x = dp->cv->width / 2;
  109. dp->mouse.y = dp->cv->height / 2;
  110. /* Resize events */
  111. dp->resize.resized = 0;
  112. return dp;
  113. }
  114. /** \brief Detach a caca graphical context from a cucul backend context.
  115. *
  116. * Detach a graphical context from its cucul backend and destroy it. The
  117. * libcucul canvas continues to exist and other graphical contexts can be
  118. * attached to it afterwards.
  119. *
  120. * This function never fails.
  121. *
  122. * \param dp The libcaca graphical context.
  123. * \return This function always returns 0.
  124. */
  125. int caca_free_display(caca_display_t *dp)
  126. {
  127. dp->drv.end_graphics(dp);
  128. #if defined(USE_PLUGINS)
  129. if(dp->plugin)
  130. dlclose(dp->plugin);
  131. #endif
  132. dp->cv->refcount--;
  133. free(dp);
  134. return 0;
  135. }
  136. /*
  137. * XXX: The following functions are local.
  138. */
  139. static int caca_select_driver(caca_display_t *dp)
  140. {
  141. #if defined(HAVE_GETENV) && defined(HAVE_STRCASECMP)
  142. char *var = getenv("CACA_DRIVER");
  143. /* If the environment variable was set, use it */
  144. if(var && *var)
  145. {
  146. #if defined(USE_WIN32)
  147. if(!strcasecmp(var, "win32")) return win32_install(dp);
  148. #endif
  149. #if defined(USE_CONIO)
  150. if(!strcasecmp(var, "conio")) return conio_install(dp);
  151. #endif
  152. #if defined(USE_X11)
  153. if(!strcasecmp(var, "x11")) return x11_install(dp);
  154. #endif
  155. #if defined(USE_GL)
  156. if(!strcasecmp(var, "gl")) return gl_install(dp);
  157. #endif
  158. #if !defined(__KERNEL__)
  159. if(!strcasecmp(var, "raw")) return raw_install(dp);
  160. #endif
  161. #if defined(USE_SLANG)
  162. if(!strcasecmp(var, "slang")) return slang_install(dp);
  163. #endif
  164. #if defined(USE_NCURSES)
  165. if(!strcasecmp(var, "ncurses")) return ncurses_install(dp);
  166. #endif
  167. #if defined(USE_VGA)
  168. if(!strcasecmp(var, "vga")) return vga_install(dp);
  169. #endif
  170. return -1;
  171. }
  172. #endif
  173. #if defined(USE_WIN32)
  174. if(win32_install(dp) == 0) return 0;
  175. #endif
  176. #if defined(USE_CONIO)
  177. if(conio_install(dp) == 0) return 0;
  178. #endif
  179. #if defined(USE_VGA)
  180. if(vga_install(dp) == 0) return 0;
  181. #endif
  182. #if defined(USE_X11)
  183. if(x11_install(dp) == 0) return 0;
  184. #endif
  185. #if defined(USE_GL)
  186. if(gl_install(dp) == 0) return 0;
  187. #endif
  188. /* ncurses has a higher priority than slang because it has better colour
  189. * support across terminal types, despite being slightly slower. */
  190. #if defined(USE_NCURSES)
  191. if(ncurses_install(dp) == 0) return 0;
  192. #endif
  193. #if defined(USE_SLANG)
  194. if(slang_install(dp) == 0) return 0;
  195. #endif
  196. return -1;
  197. }
  198. #if defined(USE_PLUGINS)
  199. static int caca_plugin_install(char const *name, caca_display_t *dp)
  200. {
  201. char buf[512];
  202. int (*sym) (caca_display_t *);
  203. sprintf(buf, "%s/lib%s_plugin.so", PLUGINDIR, name);
  204. dp->plugin = dlopen(buf, RTLD_NOW);
  205. if(!dp->plugin)
  206. {
  207. sprintf(buf, "lib%s_plugin.so", name);
  208. dp->plugin = dlopen(buf, RTLD_NOW);
  209. if(!dp->plugin)
  210. return -1;
  211. }
  212. sprintf(buf, "%s_install", name);
  213. sym = dlsym(dp->plugin, buf);
  214. if(!sym)
  215. {
  216. dlclose(dp->plugin);
  217. return -1;
  218. }
  219. return sym(dp);
  220. }
  221. #endif