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annotate libmlk-core/mlk/core/game.c @ 559:ba0cca39e4ca

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util: fmemopen leftover
author David Demelier <markand@malikania.fr>
date Wed, 08 Mar 2023 20:01:00 +0100
parents c7664b679a95
children 5a4e5b852f8a
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1 /*
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2 * game.c -- main game object
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3 *
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4 * Copyright (c) 2020-2023 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 <string.h>
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21
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22 #include "clock.h"
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23 #include "err.h"
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24 #include "event.h"
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25 #include "game.h"
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26 #include "state.h"
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27 #include "util.h"
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28 #include "window.h"
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30 static struct mlk_state *states[8];
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31
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32 struct mlk_game mlk_game = {
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33 .states = states,
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34 .statesz = MLK_UTIL_SIZE(states)
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35 };
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36
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37 void
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38 mlk_game_init(void)
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39 {
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40 for (size_t i = 0; i < mlk_game.statesz; ++i)
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41 mlk_game.states[i] = NULL;
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42 }
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43
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44 int
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45 mlk_game_push(struct mlk_state *state)
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46 {
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47 assert(state);
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48
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49 if (!mlk_game.state) {
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50 mlk_game.state = &mlk_game.states[0];
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51 mlk_state_start(*mlk_game.state = state);
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52 return 0;
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53 }
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54
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55 if (mlk_game.state == &mlk_game.states[mlk_game.statesz - 1])
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56 return mlk_errf("no space in game states stack");
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58 mlk_state_suspend(*mlk_game.state);
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59 mlk_state_start(*(++mlk_game.state) = state);
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60
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61 return 0;
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62 }
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63
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64 void
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65 mlk_game_pop(void)
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66 {
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67 if (!mlk_game.state)
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68 return;
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69
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70 mlk_state_end(*mlk_game.state);
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71 mlk_state_finish(*mlk_game.state);
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72
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73 if (mlk_game.state == mlk_game.states)
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74 mlk_game.state = NULL;
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75 else
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76 mlk_state_resume(*--mlk_game.state);
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77 }
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78
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79 void
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80 mlk_game_handle(const union mlk_event *ev)
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81 {
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82 assert(ev);
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83
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84 if (mlk_game.state && !(mlk_game.inhibit & MLK_GAME_INHIBIT_INPUT))
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85 mlk_state_handle(*mlk_game.state, ev);
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86 }
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87
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88 void
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89 mlk_game_update(unsigned int ticks)
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90 {
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91 if (mlk_game.state && !(mlk_game.inhibit & MLK_GAME_INHIBIT_UPDATE))
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92 mlk_state_update(*mlk_game.state, ticks);
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93 }
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94
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95 void
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96 mlk_game_draw(void)
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97 {
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98 if (mlk_game.state && !(mlk_game.inhibit & MLK_GAME_INHIBIT_DRAW))
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99 mlk_state_draw(*mlk_game.state);
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100 }
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101
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102 void
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103 mlk_game_loop(void)
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104 {
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105 struct mlk_clock clock = {0};
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106 unsigned int elapsed = 0;
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107 unsigned int frametime;
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108
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109 if (mlk_window.framerate > 0)
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110 frametime = 1000 / mlk_window.framerate;
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111 else
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112 /* Assuming 50.0 FPS. */
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113 frametime = 1000.0 / 50.0;
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114
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115 while (mlk_game.state) {
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116 mlk_clock_start(&clock);
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117
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118 for (union mlk_event ev; mlk_event_poll(&ev); )
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119 mlk_game_handle(&ev);
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120
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121 mlk_game_update(elapsed);
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122 mlk_game_draw();
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123
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124 /*
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125 * If vsync is enabled, it should have wait, otherwise sleep
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126 * a little to save CPU cycles.
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127 */
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128 if ((elapsed = mlk_clock_elapsed(&clock)) < frametime)
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129 mlk_util_delay(frametime - elapsed);
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130
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131 elapsed = mlk_clock_elapsed(&clock);
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132 }
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133 }
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134
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135 void
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136 mlk_game_quit(void)
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137 {
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138 for (size_t i = 0; i < mlk_game.statesz; ++i) {
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139 if (mlk_game.states[i])
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140 mlk_state_finish(mlk_game.states[i]);
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141
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142 mlk_game.states[i] = NULL;
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143 }
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144
7e835d43ef74 core: fix game crash
David Demelier <markand@malikania.fr>
parents: 522
diff changeset
145 mlk_game.state = NULL;
80
05ffbcdee585 adventure: create main menu, closes #2482 @4h
David Demelier <markand@malikania.fr>
parents: 78
diff changeset
146 }