]>
Dogcows Code - chaz/yoink/blob - Moof/Engine.cc
2 /*******************************************************************************
4 Copyright (c) 2009, Charles McGarvey
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *******************************************************************************/
29 #include <cstdlib> // exit
34 #include "fastevents.h"
36 #include "Dispatcher.hh"
39 #include "Settings.hh"
47 class Engine::EngineImpl
50 EngineImpl(int argc
, char* argv
[], const std::string
& configFile
,
51 const std::string
& name
, const std::string
& iconFile
,
56 if (SDL_Init(SDL_INIT_EVERYTHING
| SDL_INIT_EVENTTHREAD
) != 0)
58 throw Exception(SDL_GetError());
62 throw Exception(FE_GetError());
65 settings
.loadFromFile(configFile
);
68 if (settings
.get("engine.rngseed", randomSeed
))
78 settings
.get("engine.timestep", ts
);
79 timestep
= Scalar(ts
);
82 settings
.getNumber("video.maxfps", maxFps
);
83 drawRate
= 1.0 / Scalar(maxFps
);
86 settings
.get("video.printfps", printFps
);
88 video
= VideoPtr(new Video(name
, iconFile
));
94 // the video object must be destroyed before we can shutdown SDL
103 * The main loop. This just calls dispatchEvents(), update(), and draw()
104 * over and over again. The timing of the update and draw are decoupled.
105 * The actual frame rate is also calculated here. This function will return
106 * the exit code used to stop the loop.
111 Scalar ticksNow
= getTicks();
113 Scalar nextStep
= ticksNow
;
114 Scalar nextDraw
= ticksNow
;
115 Scalar nextFpsUpdate
= ticksNow
+ 1.0;
117 Scalar totalTime
= 0.0;
118 Scalar deltaTime
= 0.0;
119 Scalar accumulator
= timestep
;
127 Scalar newTicks
= getTicks();
128 deltaTime
= newTicks
- ticksNow
;
131 if (deltaTime
>= 0.25) deltaTime
= 0.25;
132 accumulator
+= deltaTime
;
134 while (accumulator
>= timestep
)
137 interface
->update(totalTime
, timestep
);
139 totalTime
+= timestep
;
140 accumulator
-= timestep
;
142 nextStep
+= timestep
;
144 if (ticksNow
>= nextStep
)
146 nextStep
= ticksNow
+ timestep
;
149 if (ticksNow
>= nextDraw
)
153 if (ticksNow
>= nextFpsUpdate
) // determine the actual fps
158 nextFpsUpdate
+= 1.0;
159 if (ticksNow
>= nextFpsUpdate
)
161 nextFpsUpdate
= ticksNow
+ 1.0;
166 std::cout
<< "FPS: " << fps
<< std::endl
;
170 interface
->draw(accumulator
/ timestep
);
173 nextDraw
+= drawRate
;
174 if (ticksNow
>= nextDraw
)
176 // we missed some scheduled draws, so reset the schedule
177 nextDraw
= ticksNow
+ drawRate
;
181 // be a good citizen and give back what you don't need
182 sleep(std::min(nextStep
, nextDraw
), true);
190 void dispatchEvents()
194 while (FE_PollEvent(&event
) == 1)
199 if (event
.key
.keysym
.sym
== SDLK_ESCAPE
&&
200 (SDL_GetModState() & KMOD_CTRL
) )
206 case SDL_VIDEORESIZE
:
207 video
->resize(event
.resize
.w
, event
.resize
.h
);
211 interface
->handleEvent(event
);
219 Dispatcher dispatcher
;
233 Engine::Engine(int argc
, char* argv
[], const std::string
& configFile
,
234 const std::string
& name
, const std::string
& iconFile
) :
235 impl_(new Engine::EngineImpl(argc
, argv
, configFile
, name
, iconFile
, this))
246 void Engine::stop(int exitCode
)
248 impl_
->running
= false;
249 impl_
->exitCode
= exitCode
;
253 void Engine::setTimestep(Scalar ts
)
255 impl_
->timestep
= ts
;
258 Scalar
Engine::getTimestep()
260 return impl_
->timestep
;
263 void Engine::setMaxFrameRate(long maxFps
)
265 impl_
->drawRate
= 1.0 / Scalar(maxFps
);
268 long Engine::getMaxFrameRate()
270 return long(1.0 / impl_
->drawRate
);
274 Video
& Engine::getVideo()
276 return *impl_
->video
;
279 long Engine::getFrameRate()
285 void Engine::update(Scalar t
, Scalar dt
) {}
286 void Engine::draw(Scalar alpha
) {}
287 void Engine::handleEvent(const Event
& event
) {}
292 /** vim: set ts=4 sw=4 tw=80: *************************************************/
This page took 0.043525 seconds and 4 git commands to generate.