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Dogcows Code - chaz/yoink/blob - src/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"
35 #include <SDL/SDL_sound.h>
38 #include "Dispatcher.hh"
41 #include "Settings.hh"
52 Impl(int argc
, char* argv
[], const std::string
& configFile
,
53 const std::string
& name
, const std::string
& iconFile
,
58 if (SDL_Init(SDL_INIT_EVERYTHING
| SDL_INIT_EVENTTHREAD
) != 0)
60 throw Exception(SDL_GetError());
64 throw Exception(FE_GetError());
66 if (Sound_Init() != 0)
68 //throw Exception(Sound_GetError());
69 std::cerr
<< Sound_GetError() << std::endl
;
71 alutInit(&argc
, argv
);
73 settings
.loadFromFile(configFile
);
76 if (settings
.get("engine.rngseed", randomSeed
)) setSeed(randomSeed
);
80 settings
.get("engine.timestep", ts
);
81 timestep
= Scalar(ts
);
84 settings
.getNumber("video.maxfps", maxFps
);
85 drawRate
= 1.0 / Scalar(maxFps
);
88 settings
.get("video.printfps", printFps
);
90 video
= VideoPtr(new Video(name
, iconFile
));
96 // the video object must be destroyed before we can shutdown SDL
107 * The main loop. This just calls dispatchEvents(), update(), and draw()
108 * over and over again. The timing of the update and draw are decoupled.
109 * The actual frame rate is also calculated here. This function will return
110 * the exit code used to stop the loop.
115 Scalar ticksNow
= getTicks();
117 Scalar nextStep
= ticksNow
;
118 Scalar nextDraw
= ticksNow
;
119 Scalar nextFpsUpdate
= ticksNow
+ 1.0;
121 Scalar totalTime
= 0.0;
122 Scalar deltaTime
= 0.0;
123 Scalar accumulator
= timestep
;
131 Scalar newTicks
= getTicks();
132 deltaTime
= newTicks
- ticksNow
;
135 if (deltaTime
>= 0.25) deltaTime
= 0.25;
136 accumulator
+= deltaTime
;
138 while (accumulator
>= timestep
)
141 interface
->update(totalTime
, timestep
);
143 totalTime
+= timestep
;
144 accumulator
-= timestep
;
146 nextStep
+= timestep
;
148 if (ticksNow
>= nextStep
)
150 nextStep
= ticksNow
+ timestep
;
153 if (ticksNow
>= nextDraw
)
157 if (ticksNow
>= nextFpsUpdate
) // determine the actual fps
162 nextFpsUpdate
+= 1.0;
163 if (ticksNow
>= nextFpsUpdate
)
165 nextFpsUpdate
= ticksNow
+ 1.0;
170 std::cout
<< "FPS: " << fps
<< std::endl
;
174 interface
->draw(accumulator
/ timestep
);
177 nextDraw
+= drawRate
;
178 if (ticksNow
>= nextDraw
)
180 // we missed some scheduled draws, so reset the schedule
181 nextDraw
= ticksNow
+ drawRate
;
185 // be a good citizen and give back what you don't need
186 sleep(std::min(nextStep
, nextDraw
), true);
194 void dispatchEvents()
198 while (FE_PollEvent(&event
) == 1)
203 if (event
.key
.keysym
.sym
== SDLK_ESCAPE
&&
204 (SDL_GetModState() & KMOD_CTRL
) )
210 case SDL_VIDEORESIZE
:
211 video
->resize(event
.resize
.w
, event
.resize
.h
);
215 interface
->handleEvent(event
);
223 Dispatcher dispatcher
;
237 Engine::Engine(int argc
, char* argv
[], const std::string
& configFile
,
238 const std::string
& name
, const std::string
& iconFile
) :
239 impl_(new Engine::Impl(argc
, argv
, configFile
, name
, iconFile
, this)) {}
249 void Engine::stop(int exitCode
)
251 impl_
->running
= false;
252 impl_
->exitCode
= exitCode
;
256 void Engine::setTimestep(Scalar ts
)
258 impl_
->timestep
= ts
;
261 Scalar
Engine::getTimestep()
263 return impl_
->timestep
;
266 void Engine::setMaxFrameRate(long maxFps
)
268 impl_
->drawRate
= 1.0 / Scalar(maxFps
);
271 long Engine::getMaxFrameRate()
273 return long(1.0 / impl_
->drawRate
);
277 Video
& Engine::getVideo()
279 return *impl_
->video
;
282 long Engine::getFrameRate()
288 void Engine::update(Scalar t
, Scalar dt
) {}
289 void Engine::draw(Scalar alpha
) {}
290 void Engine::handleEvent(const Event
& event
) {}
295 /** vim: set ts=4 sw=4 tw=80: *************************************************/
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