1 | /* |
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2 | * libcaca Colour ASCII-Art library |
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3 | * Copyright (c) 2006 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: caca.c 2821 2008-09-27 13:12:46Z sam $ |
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7 | * |
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8 | * This library is free software. It comes without any warranty, to |
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9 | * the extent permitted by applicable law. You can redistribute it |
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10 | * and/or modify it under the terms of the Do What The Fuck You Want |
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11 | * To Public License, Version 2, as published by Sam Hocevar. See |
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12 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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13 | */ |
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14 | |
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15 | /* |
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16 | * This file contains the main functions used by \e libcaca applications to |
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17 | * initialise the library, get the screen properties, set the framerate and |
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18 | * so on. |
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19 | */ |
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20 | |
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21 | #include "config.h" |
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22 | |
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23 | #if !defined(__KERNEL__) |
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24 | # include <stdlib.h> |
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25 | # include <string.h> |
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26 | # include <stdio.h> |
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27 | # if defined(USE_PLUGINS) |
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28 | # if defined(HAVE_DLFCN_H) |
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29 | # include <dlfcn.h> |
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30 | # endif |
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31 | # endif |
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32 | #endif |
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33 | |
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34 | #include "caca.h" |
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35 | #include "caca_internals.h" |
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36 | |
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37 | #if defined(USE_PLUGINS) |
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38 | # define gl_install(p) caca_plugin_install(p, "gl") |
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39 | # define x11_install(p) caca_plugin_install(p, "x11") |
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40 | #endif |
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41 | |
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42 | static int caca_can_resize(caca_display_t *); |
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43 | static int caca_install_driver(caca_display_t *, char const *); |
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44 | static int caca_uninstall_driver(caca_display_t *); |
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45 | static int caca_select_driver(caca_display_t *, char const *); |
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46 | #if defined(USE_PLUGINS) |
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47 | static int caca_plugin_install(caca_display_t *, char const *); |
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48 | #endif |
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49 | |
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50 | /** \brief Attach a caca graphical context to a caca canvas. |
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51 | * |
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52 | * Create a graphical context using device-dependent features (ncurses for |
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53 | * terminals, an X11 window, a DOS command window...) that attaches to a |
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54 | * libcaca canvas. Everything that gets drawn in the libcaca canvas can |
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55 | * then be displayed by the libcaca driver. |
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56 | * |
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57 | * If no caca canvas is provided, a new one is created. Its handle can be |
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58 | * retrieved using caca_get_canvas() and it is automatically destroyed when |
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59 | * caca_free_display() is called. |
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60 | * |
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61 | * See also caca_create_display_with_driver(). |
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62 | * |
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63 | * If an error occurs, NULL is returned and \b errno is set accordingly: |
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64 | * - \c ENOMEM Not enough memory. |
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65 | * - \c ENODEV Graphical device could not be initialised. |
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66 | * |
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67 | * \param cv The caca canvas or NULL to create a canvas automatically. |
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68 | * \return The caca graphical context or NULL if an error occurred. |
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69 | */ |
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70 | caca_display_t * caca_create_display(caca_canvas_t *cv) |
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71 | { |
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72 | return caca_create_display_with_driver(cv, NULL); |
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73 | } |
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74 | |
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75 | /** \brief Attach a specific caca graphical context to a caca canvas. |
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76 | * |
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77 | * Create a graphical context using device-dependent features (ncurses for |
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78 | * terminals, an X11 window, a DOS command window...) that attaches to a |
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79 | * libcaca canvas. Everything that gets drawn in the libcaca canvas can |
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80 | * then be displayed by the libcaca driver. |
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81 | * |
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82 | * If no caca canvas is provided, a new one is created. Its handle can be |
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83 | * retrieved using caca_get_canvas() and it is automatically destroyed when |
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84 | * caca_free_display() is called. |
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85 | * |
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86 | * If no driver name is provided, \e libcaca will try to autodetect the best |
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87 | * output driver it can. |
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88 | * |
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89 | * See also caca_create_display(). |
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90 | * |
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91 | * If an error occurs, NULL is returned and \b errno is set accordingly: |
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92 | * - \c ENOMEM Not enough memory. |
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93 | * - \c ENODEV Graphical device could not be initialised. |
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94 | * |
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95 | * \param cv The caca canvas or NULL to create a canvas automatically. |
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96 | * \param driver A string describing the desired output driver or NULL to |
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97 | * choose the best driver automatically. |
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98 | * \return The caca graphical context or NULL if an error occurred. |
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99 | */ |
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100 | caca_display_t * caca_create_display_with_driver(caca_canvas_t *cv, |
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101 | char const *driver) |
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102 | { |
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103 | caca_display_t *dp = malloc(sizeof(caca_display_t)); |
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104 | |
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105 | if(!dp) |
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106 | { |
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107 | seterrno(ENOMEM); |
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108 | return NULL; |
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109 | } |
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110 | |
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111 | if((dp->autorelease = (cv == NULL))) |
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112 | { |
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113 | cv = caca_create_canvas(0, 0); |
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114 | } |
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115 | |
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116 | dp->cv = cv; |
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117 | |
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118 | if(caca_manage_canvas(cv, (int (*)(void *))caca_can_resize, (void *)dp)) |
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119 | { |
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120 | if(dp->autorelease) |
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121 | caca_free_canvas(dp->cv); |
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122 | free(dp); |
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123 | seterrno(EBUSY); |
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124 | return NULL; |
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125 | } |
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126 | |
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127 | if(caca_install_driver(dp, driver)) |
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128 | { |
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129 | caca_unmanage_canvas(cv, (int (*)(void *))caca_can_resize, (void *)dp); |
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130 | if(dp->autorelease) |
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131 | caca_free_canvas(dp->cv); |
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132 | free(dp); |
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133 | seterrno(ENODEV); |
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134 | return NULL; |
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135 | } |
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136 | |
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137 | return dp; |
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138 | } |
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139 | |
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140 | /** \brief Get available display drivers |
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141 | * |
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142 | * Return a list of available display drivers. The list is a NULL-terminated |
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143 | * array of strings, interleaving a string containing the internal value for |
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144 | * the display driver, and a string containing the natural language |
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145 | * description for that driver. |
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146 | * |
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147 | * This function never fails. |
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148 | * |
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149 | * \return An array of strings. |
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150 | */ |
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151 | char const * const * caca_get_display_driver_list(void) |
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152 | { |
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153 | static char const * const list[] = |
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154 | { |
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155 | #if defined(USE_COCOA) |
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156 | "cocoa", "Mac OS X Cocoa", |
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157 | #endif |
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158 | #if defined(USE_WIN32) |
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159 | "win32", "Windows console", |
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160 | #endif |
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161 | #if defined(USE_CONIO) |
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162 | "conio", "MS-DOS conio", |
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163 | #endif |
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164 | #if defined(USE_X11) |
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165 | "x11", "X11 graphical window", |
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166 | #endif |
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167 | #if defined(USE_GL) |
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168 | "gl", "OpenGL window", |
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169 | #endif |
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170 | #if defined(USE_SLANG) |
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171 | "slang", "S-Lang console library", |
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172 | #endif |
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173 | #if defined(USE_NCURSES) |
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174 | "ncurses", "ncurses console library", |
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175 | #endif |
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176 | #if defined(USE_VGA) |
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177 | "vga", "direct VGA memory", |
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178 | #endif |
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179 | #if !defined(__KERNEL__) |
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180 | "raw", "raw libcaca output", |
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181 | #endif |
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182 | NULL, NULL |
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183 | }; |
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184 | |
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185 | return list; |
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186 | } |
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187 | |
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188 | /** \brief Return a caca graphical context's current output driver. |
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189 | * |
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190 | * Return the given display's current output driver. |
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191 | * |
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192 | * This function never fails. |
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193 | * |
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194 | * \param dp The caca display. |
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195 | * \return A static string. |
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196 | */ |
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197 | char const * caca_get_display_driver(caca_display_t *dp) |
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198 | { |
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199 | return dp->drv.driver; |
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200 | } |
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201 | |
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202 | /** \brief Set the output driver. |
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203 | * |
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204 | * Dynamically change the given display's output driver. |
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205 | * |
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206 | * FIXME: decide what to do in case of failure |
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207 | * |
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208 | * \param dp The caca display. |
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209 | * \param driver A string describing the desired output driver or NULL to |
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210 | * choose the best driver automatically. |
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211 | * \return 0 in case of success, -1 if an error occurred. |
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212 | */ |
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213 | int caca_set_display_driver(caca_display_t *dp, char const *driver) |
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214 | { |
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215 | caca_uninstall_driver(dp); |
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216 | if(caca_install_driver(dp, driver)) |
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217 | { |
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218 | seterrno(ENODEV); |
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219 | return -1; |
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220 | } |
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221 | |
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222 | return 0; |
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223 | } |
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224 | |
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225 | /** \brief Detach a caca graphical context from a caca backend context. |
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226 | * |
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227 | * Detach a graphical context from its caca backend and destroy it. The |
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228 | * libcaca canvas continues to exist and other graphical contexts can be |
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229 | * attached to it afterwards. |
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230 | * |
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231 | * If the caca canvas was automatically created by caca_create_display(), |
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232 | * it is automatically destroyed and any handle to it becomes invalid. |
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233 | * |
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234 | * This function never fails. |
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235 | * |
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236 | * \param dp The libcaca graphical context. |
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237 | * \return This function always returns 0. |
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238 | */ |
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239 | int caca_free_display(caca_display_t *dp) |
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240 | { |
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241 | caca_uninstall_driver(dp); |
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242 | caca_unmanage_canvas(dp->cv, (int (*)(void *))caca_can_resize, (void *)dp); |
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243 | if(dp->autorelease) |
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244 | caca_free_canvas(dp->cv); |
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245 | free(dp); |
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246 | |
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247 | return 0; |
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248 | } |
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249 | |
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250 | /** \brief Get the canvas attached to a caca graphical context. |
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251 | * |
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252 | * Return a handle on the \e caca_canvas_t object that was either attached |
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253 | * or created by caca_create_display(). |
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254 | * |
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255 | * This function never fails. |
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256 | * |
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257 | * \param dp The libcaca graphical context. |
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258 | * \return The libcaca canvas. |
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259 | */ |
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260 | caca_canvas_t * caca_get_canvas(caca_display_t *dp) |
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261 | { |
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262 | return dp->cv; |
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263 | } |
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264 | |
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265 | /** \brief Return the \e libcaca version. |
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266 | * |
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267 | * Return a read-only string with the \e libcaca version information. |
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268 | * |
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269 | * This function never fails. |
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270 | * |
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271 | * \return The \e libcaca version information. |
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272 | */ |
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273 | char const * caca_get_version(void) |
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274 | { |
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275 | return VERSION; |
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276 | } |
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277 | |
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278 | /* |
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279 | * XXX: The following functions are local. |
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280 | */ |
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281 | |
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282 | static int caca_can_resize(caca_display_t *dp) |
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283 | { |
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284 | return dp->resize.allow; |
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285 | } |
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286 | |
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287 | static int caca_install_driver(caca_display_t *dp, char const *driver) |
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288 | { |
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289 | #if defined(USE_PLUGINS) |
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290 | dp->plugin = NULL; |
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291 | #endif |
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292 | |
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293 | if(caca_select_driver(dp, driver)) |
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294 | { |
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295 | #if defined(USE_PLUGINS) |
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296 | if(dp->plugin) |
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297 | dlclose(dp->plugin); |
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298 | #endif |
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299 | return -1; |
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300 | } |
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301 | |
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302 | if(dp->drv.init_graphics(dp)) |
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303 | { |
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304 | #if defined(USE_PLUGINS) |
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305 | if(dp->plugin) |
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306 | dlclose(dp->plugin); |
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307 | #endif |
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308 | return -1; |
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309 | } |
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310 | |
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311 | /* Graphics stuff */ |
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312 | dp->delay = 0; |
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313 | dp->rendertime = 0; |
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314 | |
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315 | /* Events stuff */ |
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316 | #if defined(USE_SLANG) || defined(USE_NCURSES) |
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317 | dp->events.key_timer.last_sec = 0; |
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318 | dp->events.key_timer.last_usec = 0; |
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319 | dp->events.last_key_ticks = 0; |
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320 | dp->events.autorepeat_ticks = 0; |
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321 | dp->events.last_key_event.type = CACA_EVENT_NONE; |
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322 | #endif |
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323 | #if defined(USE_SLANG) || defined(USE_NCURSES) || defined(USE_CONIO) || defined(USE_GL) |
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324 | dp->events.queue = 0; |
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325 | #endif |
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326 | |
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327 | dp->timer.last_sec = 0; |
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328 | dp->timer.last_usec = 0; |
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329 | dp->lastticks = 0; |
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330 | |
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331 | /* Mouse position */ |
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332 | dp->mouse.x = caca_get_canvas_width(dp->cv) / 2; |
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333 | dp->mouse.y = caca_get_canvas_height(dp->cv) / 2; |
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334 | |
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335 | /* Resize events */ |
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336 | dp->resize.resized = 0; |
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337 | dp->resize.allow = 0; |
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338 | |
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339 | return 0; |
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340 | } |
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341 | |
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342 | static int caca_uninstall_driver(caca_display_t *dp) |
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343 | { |
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344 | dp->drv.end_graphics(dp); |
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345 | #if defined(USE_PLUGINS) |
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346 | if(dp->plugin) |
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347 | dlclose(dp->plugin); |
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348 | #endif |
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349 | |
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350 | return 0; |
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351 | } |
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352 | |
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353 | static int caca_select_driver(caca_display_t *dp, char const *driver) |
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354 | { |
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355 | char const *var = driver; |
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356 | #if defined(HAVE_GETENV) |
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357 | if(!var) |
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358 | var = getenv("CACA_DRIVER"); |
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359 | #endif |
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360 | |
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361 | #if defined(HAVE_STRCASECMP) |
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362 | /* If the environment variable was set, use it */ |
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363 | if(var && *var) |
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364 | { |
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365 | #if defined(USE_COCOA) |
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366 | if(!strcasecmp(var, "cocoa")) return cocoa_install(dp); |
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367 | #endif |
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368 | #if defined(USE_WIN32) |
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369 | if(!strcasecmp(var, "win32")) return win32_install(dp); |
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370 | #endif |
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371 | #if defined(USE_CONIO) |
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372 | if(!strcasecmp(var, "conio")) return conio_install(dp); |
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373 | #endif |
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374 | #if defined(USE_X11) |
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375 | if(!strcasecmp(var, "x11")) return x11_install(dp); |
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376 | #endif |
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377 | #if defined(USE_GL) |
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378 | if(!strcasecmp(var, "gl")) return gl_install(dp); |
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379 | #endif |
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380 | #if !defined(__KERNEL__) |
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381 | if(!strcasecmp(var, "raw")) return raw_install(dp); |
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382 | #endif |
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383 | #if defined(USE_SLANG) |
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384 | if(!strcasecmp(var, "slang")) return slang_install(dp); |
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385 | #endif |
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386 | #if defined(USE_NCURSES) |
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387 | if(!strcasecmp(var, "ncurses")) return ncurses_install(dp); |
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388 | #endif |
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389 | #if defined(USE_VGA) |
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390 | if(!strcasecmp(var, "vga")) return vga_install(dp); |
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391 | #endif |
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392 | return -1; |
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393 | } |
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394 | #endif |
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395 | |
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396 | #if defined(USE_COCOA) |
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397 | if(cocoa_install(dp) == 0) return 0; |
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398 | #endif |
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399 | #if defined(USE_WIN32) |
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400 | if(win32_install(dp) == 0) return 0; |
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401 | #endif |
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402 | #if defined(USE_CONIO) |
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403 | if(conio_install(dp) == 0) return 0; |
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404 | #endif |
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405 | #if defined(USE_VGA) |
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406 | if(vga_install(dp) == 0) return 0; |
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407 | #endif |
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408 | #if defined(USE_X11) |
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409 | if(x11_install(dp) == 0) return 0; |
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410 | #endif |
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411 | #if defined(USE_GL) |
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412 | if(gl_install(dp) == 0) return 0; |
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413 | #endif |
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414 | /* ncurses has a higher priority than slang because it has better colour |
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415 | * support across terminal types, despite being slightly slower. */ |
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416 | #if defined(USE_NCURSES) |
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417 | if(ncurses_install(dp) == 0) return 0; |
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418 | #endif |
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419 | #if defined(USE_SLANG) |
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420 | if(slang_install(dp) == 0) return 0; |
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421 | #endif |
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422 | |
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423 | return -1; |
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424 | } |
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425 | |
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426 | #if defined(USE_PLUGINS) |
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427 | static int caca_plugin_install(caca_display_t *dp, char const *driver) |
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428 | { |
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429 | char buf[512]; |
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430 | int (*sym) (caca_display_t *); |
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431 | |
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432 | sprintf(buf, "%s/lib%s_plugin.so", PLUGINDIR, driver); |
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433 | dp->plugin = dlopen(buf, RTLD_NOW); |
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434 | if(!dp->plugin) |
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435 | { |
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436 | sprintf(buf, "lib%s_plugin.so", driver); |
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437 | dp->plugin = dlopen(buf, RTLD_NOW); |
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438 | if(!dp->plugin) |
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439 | return -1; |
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440 | } |
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441 | |
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442 | sprintf(buf, "%s_install", driver); |
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443 | sym = dlsym(dp->plugin, buf); |
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444 | if(!sym) |
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445 | { |
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446 | dlclose(dp->plugin); |
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447 | return -1; |
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448 | } |
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449 | |
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450 | return sym(dp); |
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451 | } |
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452 | #endif |
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453 | |
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