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attotime: simpler from_hz (nw)

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hap 2018-11-06 13:39:13 +01:00
parent 9df6cfe087
commit 60c4816861
1 changed files with 4 additions and 4 deletions
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8
src/emu/attotime.h
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@ -137,10 +137,10 @@ public:
/** Create an attotime from a integer count of nanoseconds @nsec */
static constexpr attotime from_nsec(s64 nsec) { return attotime(nsec / 1000000000, (nsec % 1000000000) * (ATTOSECONDS_PER_SECOND / 1000000000)); }
/** Create an attotime from at the given frequency @frequency */
static attotime from_hz(double frequency) { assert(frequency > 0); double d = 1 / frequency; return attotime(floor(d), modf(d, &d) * ATTOSECONDS_PER_SECOND); }
static attotime from_hz(u32 frequency) { return from_hz(double(frequency)); }
static attotime from_hz(int frequency) { return from_hz(double(frequency)); }
static attotime from_hz(const XTAL &xtal) { return from_hz(xtal.dvalue()); }
static attotime from_hz(u32 frequency) { return (frequency > 1) ? attotime(0, HZ_TO_ATTOSECONDS(frequency)) : (frequency == 1) ? attotime(1, 0) : attotime::never; }
static attotime from_hz(int frequency) { return (frequency > 0) ? from_hz(u32(frequency)) : attotime::never; }
static attotime from_hz(const XTAL &xtal) { return from_hz(xtal.value()); }
static attotime from_hz(double frequency) { if (frequency > 0.0) { double i, f = modf(1.0 / frequency, &i); return attotime(i, f * ATTOSECONDS_PER_SECOND); } else return attotime::never; }
// math
attotime &operator+=(const attotime &right);