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annotate src/core/debug.h @ 117:445035ace840

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core: fix panic handling early
author David Demelier <markand@malikania.fr>
date Sat, 03 Oct 2020 19:03:22 +0200
parents 8f95462ac5f8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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79
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1 /*
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2 * debug.h -- debugging interfaces
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #ifndef MOLKO_DEBUG_H
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20 #define MOLKO_DEBUG_H
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21
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22 /**
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23 * \file debug.h
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24 * \brief Debugging interfaces.
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25 *
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26 * This module provides functions to draw debugging information within the game
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27 * window. It is mostly used for information only when state of the game is
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28 * better inspected via direct window information rather than writing in the
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29 * console.
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30 *
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31 * Predefined core states may print debugging information if
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32 * debug_options.enabled variable is set to true. However, you need to specify
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33 * the font to use in order to work.
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34 *
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35 * Each call to \ref debug_printf or \ref debug_vprintf automatically adjust
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36 * next coordinate for rendering the text. As such, user may simply print
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37 * several lines of text without having to deal with that manually.
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38 *
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39 * Example, activate global debugging.
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40 *
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41 * \code
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42 * struct font *f = font_openf("foo.ttf", 10);
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43 *
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44 * if (!f)
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45 * error_fatal();
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46 *
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47 * debug_options.default_font = f;
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48 * debug_options.enabled = true;
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49 * \endcode
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50 *
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51 * Example, print debugging information manually.
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52 *
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53 * \code
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54 * struct debug_report report = {
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55 * .color = 0x00ff00ff,
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56 * .font = myfont // Optional if debug_options.default_font is set.
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57 * };
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58 *
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59 * debug_printf("current position: %d, %d\n", x, y);
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60 * \endcode
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61 */
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62
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63 #include <stdbool.h>
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64 #include <stdarg.h>
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65
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66 #include "font.h"
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67
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68 /**
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69 * Maximum content length per report.
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70 */
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71 #define DEBUG_LINE_MAX 1024
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72
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73 /**
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74 * \brief Debugging options.
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75 *
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76 * Fill this structure with appropriate values to change debugging behavior
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77 * in core API.
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78 */
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79 struct debug_options {
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80 struct font *default_font; /*!< (RW) Default font for reports. */
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81 enum font_style default_style; /*!< (RW) Default font style. */
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82 unsigned long default_color; /*!< (RW) Default font color. */
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83 bool enable; /*!< (RW) Enable core API debugging. */
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84 };
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85
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86 /**
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87 * \brief Debug context.
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88 *
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89 * Use this structure each time you need to print one or more messages.
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90 */
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91 struct debug_report {
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92 struct font *font; /*!< (RW) Font to use. */
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93 enum font_style style; /*!< (RW) Font style to use. */
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94 unsigned long color; /*!< (RW) Font foreground color to use. */
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95 unsigned int count; /*!< (PV) Number of messages already printed. */
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96 };
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97
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98 /**
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99 * Global debugging options.
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100 */
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101 extern struct debug_options debug_options;
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102
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103 /**
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104 * Convenient macro to initialize \ref debug_report with default values.
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105 */
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106 #define DEBUG_INIT_DEFAULTS { \
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107 .font = debug_options.default_font, \
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108 .color = debug_options.default_color, \
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109 .style = debug_options.default_style \
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110 }
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111
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112 /**
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113 * Print debugging information into the screen.
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114 *
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115 * \pre report != NULL
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116 * \pre fmt != NULL
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117 * \param report the reporting context
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118 * \param fmt the printf(3) format string
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119 * \note The message length must not exceed DEBUG_LINE_MAX, otherwise its
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120 * result is truncated.
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121 */
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122 void
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123 debug_printf(struct debug_report *report, const char *fmt, ...);
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124
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125 /**
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126 * Similar to \ref debug_printf but with a va_list object.
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127 *
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128 * \see \ref debug_printf
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129 */
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130 void
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131 debug_vprintf(struct debug_report *report, const char *fmt, va_list ap);
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132
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133 #endif /* !MOLKO_DEBUG_H */