Mercurial > molko
comparison libmlk-core/mlk/core/game.c @ 431:8f59201dc76b
core: cleanup hierarchy
author | David Demelier <markand@malikania.fr> |
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date | Sat, 15 Oct 2022 20:23:14 +0200 |
parents | src/libmlk-core/core/game.c@3edda1ce314c |
children | 773a082f0b91 |
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430:1645433e008d | 431:8f59201dc76b |
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1 /* | |
2 * game.c -- main game object | |
3 * | |
4 * Copyright (c) 2020-2022 David Demelier <markand@malikania.fr> | |
5 * | |
6 * Permission to use, copy, modify, and/or distribute this software for any | |
7 * purpose with or without fee is hereby granted, provided that the above | |
8 * copyright notice and this permission notice appear in all copies. | |
9 * | |
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 */ | |
18 | |
19 #include <assert.h> | |
20 #include <string.h> | |
21 | |
22 #include "clock.h" | |
23 #include "event.h" | |
24 #include "game.h" | |
25 #include "state.h" | |
26 #include "util.h" | |
27 #include "window.h" | |
28 | |
29 struct game game = {0}; | |
30 | |
31 void | |
32 game_init(struct state **states, size_t statesz) | |
33 { | |
34 assert(states); | |
35 assert(statesz); | |
36 | |
37 memset(&game, 0, sizeof (game)); | |
38 | |
39 game.states = states; | |
40 game.statesz = statesz; | |
41 | |
42 for (size_t i = 0; i < game.statesz; ++i) | |
43 game.states[i] = NULL; | |
44 } | |
45 | |
46 void | |
47 game_push(struct state *state) | |
48 { | |
49 assert(state); | |
50 assert(!game.state || game.state != &game.states[game.statesz - 1]); | |
51 | |
52 if (!game.state) { | |
53 game.state = &game.states[0]; | |
54 state_start(*game.state = state); | |
55 } else { | |
56 state_suspend(*game.state); | |
57 state_start(*(++game.state) = state); | |
58 } | |
59 } | |
60 | |
61 void | |
62 game_pop(void) | |
63 { | |
64 assert(game.state); | |
65 | |
66 state_end(*game.state); | |
67 state_finish(*game.state); | |
68 | |
69 if (game.state == game.states) | |
70 game.state = NULL; | |
71 else | |
72 state_resume(*--game.state); | |
73 } | |
74 | |
75 void | |
76 game_handle(const union event *ev) | |
77 { | |
78 assert(ev); | |
79 | |
80 if (*game.state && !(game.inhibit & INHIBIT_STATE_INPUT)) | |
81 state_handle(*game.state, ev); | |
82 } | |
83 | |
84 void | |
85 game_update(unsigned int ticks) | |
86 { | |
87 if (*game.state && !(game.inhibit & INHIBIT_STATE_UPDATE)) | |
88 state_update(*game.state, ticks); | |
89 } | |
90 | |
91 void | |
92 game_draw(void) | |
93 { | |
94 if (*game.state && !(game.inhibit & INHIBIT_STATE_DRAW)) | |
95 state_draw(*game.state); | |
96 } | |
97 | |
98 void | |
99 game_loop(void) | |
100 { | |
101 struct mlk_clock clock = {0}; | |
102 unsigned int elapsed = 0; | |
103 unsigned int frametime; | |
104 | |
105 if (window.framerate > 0) | |
106 frametime = 1000 / window.framerate; | |
107 else | |
108 /* Assuming 50.0 FPS. */ | |
109 frametime = 1000.0 / 50.0; | |
110 | |
111 while (*game.state) { | |
112 mlk_clock_start(&clock); | |
113 | |
114 for (union event ev; event_poll(&ev); ) | |
115 game_handle(&ev); | |
116 | |
117 game_update(elapsed); | |
118 game_draw(); | |
119 | |
120 /* | |
121 * If vsync is enabled, it should have wait, otherwise sleep | |
122 * a little to save CPU cycles. | |
123 */ | |
124 if ((elapsed = mlk_clock_elapsed(&clock)) < frametime) | |
125 util_delay(frametime - elapsed); | |
126 | |
127 elapsed = mlk_clock_elapsed(&clock); | |
128 } | |
129 } | |
130 | |
131 void | |
132 game_quit(void) | |
133 { | |
134 for (size_t i = 0; i < game.statesz; ++i) { | |
135 if (game.states[i]) | |
136 state_finish(game.states[i]); | |
137 | |
138 game.states[i] = NULL; | |
139 } | |
140 } |