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added documentation for FROM_TO_INT

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laochailan 2017-04-03 10:10:58 +02:00
parent 218a6aa711
commit bc0c7696e6
1 changed files with 13 additions and 0 deletions
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13
src/stage.h
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@ -26,6 +26,19 @@
#define TIMER(ptr) int *__timep = ptr; int _i = 0, _ni = 0; _i = _ni = _i;
#define AT(t) if(*__timep == t)
#define FROM_TO(start,end,step) _ni = _ni; _i = (*__timep - (start))/(step); if(*__timep >= (start) && *__timep <= (end) && !((*__timep - (start)) % (step)))
// Like FROM_TO just with two different intervals:
// A pause interval step and an action interval dur. For dur frames something
// happens, then for step frames there is a break of step frames.
//
// Lastly, istep is the step inside the action interval. For istep = 2, only
// every second frame of dur is executed.
//
// Finally an example for step = 4, dur = 5, and istep = 2:
//
// A_A_A____A_A_A____A_A_A____...
//
// where A denotes a frame in which the body of FROM_TO_INT gets executed.
#define FROM_TO_INT(start, end, step, dur, istep) \
_i = (*__timep - (start))/(step+dur); _ni = ((*__timep - (start)) % (step+dur))/istep; \
if(*__timep >= (start) && *__timep <= (end) && (*__timep - (start)) % ((dur) + (step)) <= dur && !((*__timep - (start)) % (istep)))