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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"
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 * with a value of 0 if the member variable running becomes true.
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
;
145 if (ticksNow
>= nextDraw
)
149 if (ticksNow
>= nextFpsUpdate
) // determine the actual fps
154 nextFpsUpdate
+= 1.0;
155 if (ticksNow
>= nextFpsUpdate
)
157 nextFpsUpdate
= ticksNow
+ 1.0;
162 std::cout
<< "FPS: " << fps
<< std::endl
;
166 interface
->draw(accumulator
/ timestep
);
169 nextDraw
+= drawRate
;
170 if (ticksNow
>= nextDraw
)
172 // we missed some scheduled draws, so reset the schedule
173 nextDraw
= ticksNow
+ drawRate
;
177 // be a good citizen and give back what you don't need
178 sleep(std::min(nextStep
, nextDraw
), true);
186 void dispatchEvents()
190 while (FE_PollEvent(&event
) == 1)
195 if (event
.key
.keysym
.sym
== SDLK_ESCAPE
&&
196 (SDL_GetModState() & KMOD_CTRL
) )
202 case SDL_VIDEORESIZE
:
203 video
->resize(event
.resize
.w
, event
.resize
.h
);
207 interface
->handleEvent(event
);
215 Dispatcher dispatcher
;
228 Engine::Engine(int argc
, char* argv
[], const std::string
& configFile
,
229 const std::string
& name
, const std::string
& iconFile
) :
230 impl_(new Engine::EngineImpl(argc
, argv
, configFile
, name
, iconFile
, this))
243 impl_
->running
= false;
247 void Engine::setTimestep(Scalar ts
)
249 impl_
->timestep
= ts
;
252 Scalar
Engine::getTimestep()
254 return impl_
->timestep
;
257 void Engine::setMaxFrameRate(long maxFps
)
259 impl_
->drawRate
= 1.0 / Scalar(maxFps
);
262 long Engine::getMaxFrameRate()
264 return long(1.0 / impl_
->drawRate
);
268 Video
& Engine::getVideo()
270 return *impl_
->video
;
273 long Engine::getFrameRate()
279 void Engine::update(Scalar t
, Scalar dt
) {}
280 void Engine::draw(Scalar alpha
) {}
281 void Engine::handleEvent(const Event
& event
) {}
286 /** vim: set ts=4 sw=4 tw=80: *************************************************/
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