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e68f847b PG |
1 | /* |
2 | * Copyright (C) 2008 Patrik Gornicz, Gornicz_P (at) hotmail (dot) com. | |
3 | * | |
4 | * This program is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 3 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
ad9f1fb6 PG |
18 | #include <GL/gl.h> |
19 | #include <GL/glu.h> | |
20 | #include <SDL/SDL.h> | |
21 | ||
f7b3b2eb | 22 | #include "debug.h" |
7cbd4505 | 23 | #include "handleSignal.h" |
f7b3b2eb | 24 | |
ad9f1fb6 PG |
25 | #include "game.h" |
26 | #include "ticks.h" | |
44b079f8 PG |
27 | |
28 | #include "graphics/graphics.h" | |
f7b3b2eb | 29 | #include "input/inputManager.h" |
b1d92c2f | 30 | #include "config/config.h" |
ad9f1fb6 | 31 | |
ad9f1fb6 | 32 | /// ***** Private Method Headers ***** |
617dcc71 | 33 | |
ad9f1fb6 PG |
34 | void init(); |
35 | ||
7cbd4505 PG |
36 | void sighandler( int sig ); |
37 | ||
ad9f1fb6 | 38 | void run(); |
617dcc71 | 39 | void clean(); |
ad9f1fb6 PG |
40 | |
41 | void blockUpdate(); | |
42 | void updateFPSCounters(); | |
43 | ||
68b2316d | 44 | void handleInput(); |
ad9f1fb6 PG |
45 | void update(float); |
46 | void draw(); | |
47 | ||
ad9f1fb6 PG |
48 | /// ***** Private Variables ***** |
49 | ||
50 | // variable used to determine if it is time to shutdown | |
51 | bool is_Running; | |
52 | ||
53 | /* Values for the main game loop | |
54 | * target_UPS := the amount of updates that is wanted in one second | |
55 | * last_Update := stores the time of the last update | |
56 | * update_Sum := used to determine the updates needs for this run | |
57 | ||
58 | * ups := updates per second for the last second | |
59 | * fps := frames per second for the last second | |
60 | * update_Count := counts this seconds updates | |
61 | * draw_Count := counts this seconds draws | |
62 | * last_Second := stores the time of the last second, used for ups and fps | |
63 | */ | |
64 | int target_UPS = 250; | |
65 | long int last_Block_Update; | |
66 | float update_Sum = 0; | |
67 | ||
68 | int ups, fps; | |
69 | int update_Count, draw_Count; | |
70 | long int last_Second; | |
71 | ||
72 | ||
617dcc71 PG |
73 | /// ***** MAIN Method ***** |
74 | int main() | |
75 | { | |
76 | init(); | |
77 | run(); | |
78 | clean(); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | /// ***** Initializers/Cleaners ***** | |
83 | ||
ad9f1fb6 PG |
84 | void init() |
85 | { | |
7cbd4505 PG |
86 | installSignal(); |
87 | ||
68b2316d | 88 | graphics::init(); |
ad9f1fb6 | 89 | |
68b2316d | 90 | game::init(); |
ad9f1fb6 | 91 | |
68b2316d | 92 | input::init(); |
617dcc71 | 93 | |
b1d92c2f PG |
94 | cfg::init(); |
95 | ||
f7b3b2eb | 96 | #ifdef DEBUGGING |
ad9f1fb6 | 97 | cout << "Initialization Complete" << endl; |
f7b3b2eb | 98 | #endif |
ad9f1fb6 PG |
99 | } |
100 | ||
617dcc71 | 101 | void clean() |
44b079f8 PG |
102 | { |
103 | #ifdef DEBUGGING | |
104 | cout << "Cleaning up" << endl; | |
105 | #endif | |
106 | ||
b1d92c2f PG |
107 | cfg::clean(); |
108 | ||
68b2316d | 109 | input::clean(); |
617dcc71 | 110 | |
68b2316d | 111 | game::clean(); |
44b079f8 | 112 | |
68b2316d | 113 | graphics::clean(); |
44b079f8 PG |
114 | } |
115 | ||
617dcc71 PG |
116 | /// ***** Private Methods ***** |
117 | ||
ad9f1fb6 PG |
118 | void run() |
119 | { | |
120 | is_Running = true; | |
121 | last_Block_Update = tickCountMicro(); | |
122 | last_Second = tickCountMicro(); | |
123 | ||
124 | while(is_Running) | |
125 | { | |
126 | blockUpdate(); | |
127 | updateFPSCounters(); | |
128 | draw(); | |
129 | } | |
130 | } | |
131 | ||
ad9f1fb6 PG |
132 | void blockUpdate() |
133 | { | |
134 | long int start = tickCountMicro(); | |
135 | ||
136 | // Calculate the updates that should be run for the next draw | |
137 | update_Sum += (start - last_Block_Update) / (1000000 / (float)target_UPS); | |
138 | ||
139 | // insures the float to int cast is done once. | |
140 | int iupdate_sum = (int)update_Sum; | |
141 | ||
142 | // TODO the main run loop needs to be tested and pruned | |
143 | if (iupdate_sum > 0) | |
144 | { | |
145 | // Calculate a time step that spreads the updates out as much as possible | |
146 | // used because really quick updates are nearly wasted | |
147 | float time_step = ((float)(start - last_Block_Update)) / iupdate_sum; | |
148 | ||
149 | // run the updates | |
150 | for (int i = 1; i <= iupdate_sum; i++) | |
151 | { | |
68b2316d | 152 | handleInput(); |
ad9f1fb6 PG |
153 | update(time_step*i / 1000); |
154 | } | |
155 | // remove the updates that where run from the sum | |
156 | update_Sum -= iupdate_sum; | |
157 | last_Block_Update = tickCountMicro(); | |
158 | } | |
159 | } | |
160 | ||
161 | void updateFPSCounters() | |
162 | { | |
163 | // Check if a second has passed to recalculate UPS and FPS | |
164 | if (tickCountMicro() - last_Second >= 1000000) | |
165 | { | |
166 | ups = update_Count; | |
167 | fps = draw_Count; | |
168 | update_Count = 0; | |
169 | draw_Count = 0; | |
170 | ||
171 | last_Second = tickCountMicro(); | |
44b079f8 | 172 | |
7adc59fe PG |
173 | #ifdef FPSUPS |
174 | cout << "ups:\t" << ups << endl; | |
175 | cout << "fps:\t" << fps << endl; | |
176 | #endif | |
ad9f1fb6 PG |
177 | } |
178 | } | |
179 | ||
68b2316d | 180 | void handleInput() |
ad9f1fb6 | 181 | { |
68b2316d | 182 | input::update(); |
f7b3b2eb | 183 | |
68b2316d | 184 | game::input(); |
ad9f1fb6 | 185 | |
b1d92c2f | 186 | if(cfg::endGame()) |
ad9f1fb6 | 187 | is_Running = false; |
ad9f1fb6 PG |
188 | } |
189 | ||
190 | void update(float time_step) | |
191 | { | |
192 | update_Count++; | |
193 | ||
68b2316d | 194 | game::update(time_step); |
ad9f1fb6 PG |
195 | } |
196 | ||
197 | void draw() | |
198 | { | |
199 | draw_Count++; | |
200 | ||
68b2316d | 201 | game::draw(); |
ad9f1fb6 PG |
202 | |
203 | SDL_GL_SwapBuffers(); | |
204 | ||
205 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); | |
206 | } |