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Difference between revisions of "HOWTO-Backends"
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==== Example of minimal main() ==== | ==== Example of minimal main() ==== | ||
< | <syntaxhighlight lang="cpp">int main(int argc, char *argv[]) { | ||
g_system = new OSystem_Foobar(); | g_system = new OSystem_Foobar(); | ||
assert(g_system); | assert(g_system); | ||
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g_system->quit(); | g_system->quit(); | ||
return res; | return res; | ||
}</ | }</syntaxhighlight> | ||
That's it. The difficult part is of course writing the OSystem subclass. More on that in the next section! | That's it. The difficult part is of course writing the OSystem subclass. More on that in the next section! | ||
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If you are writing a backend for such a system, you may use code like this: | If you are writing a backend for such a system, you may use code like this: | ||
< | <syntaxhighlight lang="cpp">void updateScreen() { | ||
uint32 newTime = getMillis(); | uint32 newTime = getMillis(); | ||
if (newTime - _oldTime < 1000 / MAX_FPS) | if (newTime - _oldTime < 1000 / MAX_FPS) | ||
| Line 60: | Line 60: | ||
// do actual screen update | // do actual screen update | ||
}</ | }</syntaxhighlight> | ||
That should do the trick for you. This code has the slight disadvantage that it skips some screen updates though. This means there is a possibility that it skips an important screen update, which is not followed by any other screen update for some time, leading to some graphics glitch. | That should do the trick for you. This code has the slight disadvantage that it skips some screen updates though. This means there is a possibility that it skips an important screen update, which is not followed by any other screen update for some time, leading to some graphics glitch. | ||