Mercurial > molko
annotate libadventure/adventure/trace_hud.c @ 141:4eeeccf2b732
core: add trace/vtrace functions, closes #2493
author | David Demelier <markand@malikania.fr> |
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date | Wed, 14 Oct 2020 10:29:53 +0200 |
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children | 7f1af54bb35a |
rev | line source |
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1 /* |
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2 * trace_hud.c -- on screen hud |
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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 #include <assert.h> |
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20 #include <stdio.h> |
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21 #include <string.h> |
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22 |
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23 #include <core/label.h> |
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24 #include <core/font.h> |
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25 #include <core/theme.h> |
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26 #include <core/trace.h> |
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27 |
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28 #include "trace_hud.h" |
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29 |
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30 #define LINES_MAX (4) |
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31 #define THEME(t) ((t) ? (t) : theme_default()) |
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32 |
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33 static struct { |
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34 char lines[LINES_MAX + 1][TRACE_LINE_MAX]; |
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35 unsigned int elapsed; |
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36 } data; |
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37 |
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38 struct trace_hud trace_hud = { |
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39 .timeout = TRACE_HUD_TIMEOUT_DEFAULT |
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40 }; |
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41 |
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42 void |
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43 trace_hud_handler(const char *str) |
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44 { |
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45 assert(str); |
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46 |
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47 /* 1.Try to find an empty line. */ |
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48 for (size_t i = 0; i < LINES_MAX; ++i) { |
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49 if (data.lines[i][0] == '\0') { |
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50 snprintf(data.lines[i], sizeof (data.lines[i]), "%s", str); |
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51 return; |
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52 } |
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53 } |
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54 |
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55 /* 2. All lines are full, put in last one and move other. */ |
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56 memmove(&data.lines[0], &data.lines[1], sizeof (data.lines[0]) * LINES_MAX - 1); |
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57 snprintf(data.lines[LINES_MAX - 1], sizeof (data.lines[0]), "%s", str); |
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58 |
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59 /* 3. Reset elapsed time now. */ |
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60 data.elapsed = 0; |
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61 } |
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62 |
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63 void |
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64 trace_hud_update(unsigned int ticks) |
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65 { |
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66 data.elapsed += ticks; |
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67 |
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68 /* |
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69 * We have an empty line in the data.lines at LINES_MAX, so we simply so |
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70 * to move the whole array. |
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71 * |
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72 * [0] = "abc" |
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73 * [1] = "def" |
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74 * [2] = "xyz" |
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75 * [3] = "zef" |
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76 * [n] = "ldkf" |
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77 * [LINES_MAX + 1] = "\0" |
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78 */ |
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79 if (data.elapsed >= trace_hud.timeout) { |
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80 data.elapsed = 0; |
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81 memmove(&data.lines[0], &data.lines[1], sizeof (data.lines[0]) * LINES_MAX); |
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82 } |
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83 } |
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84 |
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85 void |
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86 trace_hud_draw(void) |
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87 { |
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88 struct theme *th; |
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89 int x, y; |
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90 |
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91 th = THEME(trace_hud.theme); |
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92 x = th->padding; |
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93 y = th->padding; |
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94 |
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95 for (int i = 0; i < LINES_MAX && data.lines[i][0]; ++i) { |
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96 label_draw(&(struct label) { |
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97 .x = x, |
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98 .y = y, |
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99 .text = data.lines[i], |
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100 .theme = th, |
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101 .flags = LABEL_NO_HCENTER |
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102 }); |
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103 |
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104 y += font_height(th->fonts[THEME_FONT_INTERFACE]); |
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105 y += th->padding; |
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106 } |
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107 } |
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108 |
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109 void |
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110 trace_hud_clear(void) |
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111 { |
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112 memset(&data, 0, sizeof (data)); |
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113 } |