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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>
40 #include "Settings.hh"
51 Impl(int argc
, char* argv
[], const std::string
& configFile
,
52 const std::string
& name
, const std::string
& iconFile
,
56 if (SDL_Init(SDL_INIT_EVERYTHING
| SDL_INIT_EVENTTHREAD
) != 0)
58 std::cerr
<< "sdl is complaining: " << SDL_GetError() << std::endl
;
59 throw Exception(Exception::SDL_ERROR
);
63 std::cerr
<< "fast events error: " << FE_GetError() << std::endl
;
64 throw Exception(Exception::SDL_ERROR
);
66 if (Sound_Init() == 0)
68 std::cerr
<< "sound initialization failed: " << Sound_GetError()
70 throw Exception(Exception::SDL_ERROR
);
72 alutInit(&argc
, argv
);
74 Settings
& settings
= Settings::getInstance();
75 settings
.parseArgs(argc
, argv
);
76 settings
.loadFromFile(configFile
);
79 if (settings
.get("engine.rngseed", randomSeed
)) setSeed(randomSeed
);
83 settings
.get("engine.timestep", ts
);
84 timestep
= Scalar(ts
);
87 settings
.getNumber("video.maxfps", maxFps
);
88 drawRate
= 1.0 / Scalar(maxFps
);
91 settings
.get("video.printfps", printFps
);
93 video
= Video::alloc(name
, iconFile
);
99 // the video object must be destroyed before we can shutdown SDL
110 * The main loop. This just calls dispatchEvents(), update(), and draw()
111 * over and over again. The timing of the update and draw are decoupled.
112 * The actual frame rate is also calculated here. This function will return
113 * the exit code used to stop the loop.
118 Scalar ticksNow
= getTicks();
120 Scalar nextStep
= ticksNow
;
121 Scalar nextDraw
= ticksNow
;
122 Scalar nextFpsUpdate
= ticksNow
+ 1.0;
124 Scalar totalTime
= 0.0;
125 Scalar deltaTime
= 0.0;
126 Scalar accumulator
= timestep
;
134 Scalar newTicks
= getTicks();
135 deltaTime
= newTicks
- ticksNow
;
138 if (deltaTime
>= 0.25) deltaTime
= 0.25;
139 accumulator
+= deltaTime
;
141 while (accumulator
>= timestep
)
144 interface
->update(totalTime
, timestep
);
146 totalTime
+= timestep
;
147 accumulator
-= timestep
;
149 nextStep
+= timestep
;
151 if (ticksNow
>= nextStep
)
153 nextStep
= ticksNow
+ timestep
;
156 if (ticksNow
>= nextDraw
)
160 if (ticksNow
>= nextFpsUpdate
) // determine the actual fps
165 nextFpsUpdate
+= 1.0;
166 if (ticksNow
>= nextFpsUpdate
)
168 nextFpsUpdate
= ticksNow
+ 1.0;
173 std::cout
<< "FPS: " << fps
<< std::endl
;
177 interface
->draw(accumulator
/ timestep
);
180 nextDraw
+= drawRate
;
181 if (ticksNow
>= nextDraw
)
183 // we missed some scheduled draws, so reset the schedule
184 nextDraw
= ticksNow
+ drawRate
;
188 // be a good citizen and give back what you don't need
189 sleep(std::min(nextStep
, nextDraw
), true);
197 void dispatchEvents()
201 while (FE_PollEvent(&event
) == 1)
206 if (event
.key
.keysym
.sym
== SDLK_ESCAPE
&&
207 (SDL_GetModState() & KMOD_CTRL
) )
213 case SDL_VIDEORESIZE
:
214 video
->resize(event
.resize
.w
, event
.resize
.h
);
218 interface
->handleEvent(event
);
238 Engine::Engine(int argc
, char* argv
[], const std::string
& configFile
,
239 const std::string
& name
, const std::string
& iconFile
) :
240 impl_(new Engine::Impl(argc
, argv
, configFile
, name
, iconFile
, this)) {}
250 void Engine::stop(int exitCode
)
252 impl_
->running
= false;
253 impl_
->exitCode
= exitCode
;
257 void Engine::setTimestep(Scalar ts
)
259 impl_
->timestep
= ts
;
262 Scalar
Engine::getTimestep()
264 return impl_
->timestep
;
267 void Engine::setMaxFrameRate(long maxFps
)
269 impl_
->drawRate
= 1.0 / Scalar(maxFps
);
272 long Engine::getMaxFrameRate()
274 return long(1.0 / impl_
->drawRate
);
278 Video
& Engine::getVideo()
280 return *impl_
->video
;
283 long Engine::getFrameRate()
289 void Engine::update(Scalar t
, Scalar dt
) {}
290 void Engine::draw(Scalar alpha
) {}
291 void Engine::handleEvent(const Event
& event
) {}
296 /** vim: set ts=4 sw=4 tw=80: *************************************************/
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