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annotate libmlk-core/mlk/core/game.c @ 646:7e1eb7f6c049 default tip @

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misc: remove .clang
author David Demelier <markand@malikania.fr>
date Sun, 04 Feb 2024 15:24:37 +0100
parents 83781cc87fca
children
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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 #include <setjmp.h>
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22
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23 #include "clock.h"
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24 #include "core_p.h"
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25 #include "err.h"
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26 #include "event.h"
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27 #include "game.h"
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28 #include "state.h"
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29 #include "util.h"
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30 #include "window.h"
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31
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32 enum {
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33 JMP_OK = 0,
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34 JMP_PUSH,
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35 JMP_POP
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36 };
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37
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38 static struct mlk_state *states[8];
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39 static jmp_buf game_jmp_buf;
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40 static int game_jmp_allowed;
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41 static int game_run = 1;
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42
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43 struct mlk_game mlk_game = {
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44 .states = states,
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45 .statesz = MLK_UTIL_SIZE(states)
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46 };
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47
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48 void
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49 mlk_game_init(void)
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50 {
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51 for (size_t i = 0; i < mlk_game.statesz; ++i)
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52 mlk_game.states[i] = NULL;
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53 }
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54
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55 _Noreturn int
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56 mlk_game_push(struct mlk_state *state)
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57 {
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58 assert(state);
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59 assert(game_jmp_allowed);
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60
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61 if (mlk_game.state == &mlk_game.states[mlk_game.statesz - 1])
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62 mlk_errf(_("no space in game states stack"));
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63
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64 mlk_game.state[1] = state;
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65 longjmp(game_jmp_buf, JMP_PUSH);
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66 }
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67
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68 _Noreturn void
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69 mlk_game_pop(void)
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70 {
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71 assert(game_jmp_allowed);
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72
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73 longjmp(game_jmp_buf, JMP_POP);
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74 }
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75
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76 void
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77 mlk_game_loop(struct mlk_state *state)
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78 {
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79 assert(state);
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80
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81 struct mlk_clock clock = {};
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82 unsigned int elapsed = 0;
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83 unsigned int frametime;
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84
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85 if (mlk_window.framerate > 0)
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86 frametime = 1000 / mlk_window.framerate;
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87 else
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88 /* Assuming 60.0 FPS. */
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89 frametime = 1000.0 / 60.0;
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90
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91 game_jmp_allowed = 1;
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92
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93 while (game_run) {
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94 switch (setjmp(game_jmp_buf)) {
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95 case JMP_OK:
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96 /* Initial entrypoint. */
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97 if (!mlk_game.state) {
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98 mlk_game.states[0] = state;
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99 mlk_game.state = &mlk_game.states[0];
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100 mlk_state_start(state);
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101 }
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102
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103 mlk_clock_start(&clock);
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104
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105 for (union mlk_event ev; mlk_event_poll(&ev); ) {
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106 if (mlk_game.state && !(mlk_game.inhibit & MLK_GAME_INHIBIT_INPUT))
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107 mlk_state_handle(*mlk_game.state, ev);
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108 }
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109
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110 if (mlk_game.state && !(mlk_game.inhibit & MLK_GAME_INHIBIT_UPDATE))
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111 mlk_state_update(*mlk_game.state, ticks);
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112 if (mlk_game.state && !(mlk_game.inhibit & MLK_GAME_INHIBIT_DRAW))
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113 mlk_state_draw(*mlk_game.state);
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114
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115 /*
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116 * If vsync is enabled, it should have wait, otherwise
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117 * sleep a little to save CPU cycles.
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118 */
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119 if ((elapsed = mlk_clock_elapsed(&clock)) < frametime)
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120 mlk_util_sleep(frametime - elapsed);
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121
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122 elapsed = mlk_clock_elapsed(&clock);
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123
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124 /*
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125 * Cap to frametime if it's too slow because it would
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126 * create unexpected results otherwise.
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127 */
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128 if (elapsed > frametime)
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129 elapsed = frametime;
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130 break;
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131 case JMP_PUSH:
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132 /*
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133 * We have pushed a new state, suspend should not modify
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134 * the stack because we would have a leak in the next
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135 * state being overriden without being finalized.
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136 */
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137 game_jmp_allowed = 0;
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138 mlk_state_suspend(*mlk_game.state);
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139 game_jmp_allowed = 1;
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140
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141 /* Start next state. */
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142 mlk_state_start(*++mlk_game.state);
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143 break;
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144 case JMP_POP:
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145 /*
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146 * We need to finalize this state so the end/finish
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147 * functions are not allowed to modify the stack.
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148 */
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149 game_jmp_allowed = 0;
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150 mlk_state_end(*mlk_game.state);
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151 mlk_state_finish(*mlk_game.state);
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152 game_jmp_allowed = 1;
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153
645
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154 /* Resume previous state. */
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155 if (mlk_game.state == mlk_game.states)
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156 mlk_game.state = NULL;
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157 else
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158 mlk_state_resume(*--mlk_game.state);
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159 break;
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160 default:
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161 break;
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162 }
207
133926e08d6e examples: use game_loop for all
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163 }
44
c97fe725fdeb core: implement basic states, closes #2457 @1h
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164 }
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9f6267843815 core: implement basic actions, closes #2463 @1h
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165
80
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166 void
452
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167 mlk_game_quit(void)
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168 {
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169 game_jmp_allowed = 0;
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170 game_run = 0;
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171
522
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172 for (size_t i = 0; i < mlk_game.statesz; ++i) {
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173 if (mlk_game.states[i])
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174 mlk_state_finish(mlk_game.states[i]);
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175
522
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176 mlk_game.states[i] = NULL;
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177 }
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178
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179 mlk_game.state = NULL;
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180 }