77 lines
1.3 KiB
Go
77 lines
1.3 KiB
Go
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package engine
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import (
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"time"
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"zworld/plugins/math"
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)
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type framecounter struct {
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next int
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samples int
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last int64
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frames []int64
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start time.Time
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now time.Time
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elapsed float32
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delta float32
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}
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func NewFrameCounter(samples int) *framecounter {
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return &framecounter{
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samples: samples,
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last: time.Now().UnixNano(),
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frames: make([]int64, 0, samples),
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start: time.Now(),
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now: time.Now(),
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}
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}
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type Timing struct {
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Current float32
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Average float32
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Max float32
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}
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func (fc *framecounter) Elapsed() float32 {
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return fc.elapsed
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}
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func (fc *framecounter) Delta() float32 {
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return fc.delta
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}
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func (fc *framecounter) Update() {
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// clock
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now := time.Now()
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fc.delta = float32(now.Sub(fc.now).Seconds())
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fc.now = now
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fc.elapsed = float32(fc.now.Sub(fc.start).Seconds())
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// fps
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ft := fc.now.UnixNano()
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ns := ft - fc.last
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fc.last = ft
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if len(fc.frames) < fc.samples {
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fc.frames = append(fc.frames, ns)
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} else {
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fc.frames[fc.next%fc.samples] = ns
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}
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fc.next++
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}
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func (fc *framecounter) Sample() Timing {
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tot := int64(0)
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max := int64(0)
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for _, f := range fc.frames {
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tot += f
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max = math.Max(max, f)
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}
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current := fc.frames[(fc.next-1)%fc.samples]
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return Timing{
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Average: float32(tot) / float32(len(fc.frames)) / 1e9,
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Max: float32(max) / 1e9,
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Current: float32(current) / 1e9,
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}
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}
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