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Difference between revisions of "HOWTO-Backends"
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# Make sure to provide the <tt>main</tt> function in your backend (the actual main function of ScummVM is <tt>scummvm_main</tt>, which your backend must invoke at some point). | # Make sure to provide the <tt>main</tt> function in your backend (the actual main function of ScummVM is <tt>scummvm_main</tt>, which your backend must invoke at some point). | ||
# Instantiate the OSystem class and assign it to <tt>g_system</tt>, do that before calling <tt>scumm_main</tt>. | # Instantiate the OSystem class and assign it to <tt>g_system</tt>, do that before calling <tt>scumm_main</tt>. | ||
# Deinit properly after calling <tt>scumm_main</tt>, particularly call <tt>g_system-> | # Deinit properly after calling <tt>scumm_main</tt>, particularly call <tt>g_system->destroy()</tt>. | ||
# If appropriate, edit <tt>configure</tt> to add your backend (this is only necessary if you are going to use the "./configure && make" build system). | # If appropriate, edit <tt>configure</tt> to add your backend (this is only necessary if you are going to use the "./configure && make" build system). | ||
==== Example of minimal main() ==== | ==== Example of minimal main() ==== | ||
<syntaxhighlight lang="cpp">int main(int argc, char *argv[]) { | <syntaxhighlight lang="cpp">int main(int argc, char *argv[]) { | ||
// Create our OSystem instance | |||
g_system = new OSystem_Foobar(); | g_system = new OSystem_Foobar(); | ||
assert(g_system); | assert(g_system); | ||
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// Invoke the actual ScummVM main entry point: | // Invoke the actual ScummVM main entry point: | ||
int res = scummvm_main(argc, argv); | int res = scummvm_main(argc, argv); | ||
// Free OSystem | |||
g_system->destroy(); | |||
return res; | return res; | ||
}</syntaxhighlight> | }</syntaxhighlight> | ||