Development > Newbie Coding

computing surface- and contentflags

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DarkRain:
To check a flag you use the 'bitwise and' say: surfaceflags & someflag == someflag  (like the example I gave with windows' calculator — which does precisely a bitwise and)

You can get the flag for a given level by *left* shifting like this: 1 << n where n is the level number (starts from zero)

Additionally you can add flags together with 'bitwise or' so for example to get the flags for the two bottom levels in a single value: levelflags = (1 << 0) | (1 << 1)

Mattn:
oh sorry, yes, left shifting of course.

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