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tick.go
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tick.go
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/*
* Copyright (c) 2021 The GoPlus Authors (goplus.org). All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package spx
import (
"sync/atomic"
"unsafe"
"github.com/goplus/spx/internal/coroutine"
"github.com/hajimehoshi/ebiten/v2"
)
// -------------------------------------------------------------------------------------
type tickHandlerBase struct {
prev, next *tickHandlerBase
}
func (p *tickHandlerBase) initList() {
p.prev, p.next = p, p
}
func (p *tickHandlerBase) removeFromList() {
prev, next := p.prev, p.next
prev.next, next.prev = next, prev
p.prev, p.next = p, p
}
func (p *tickHandlerBase) insertNext(this *tickHandler) *tickHandler {
next := p.next
h := (*tickHandlerBase)(unsafe.Pointer(this))
h.prev, h.next = p, next
p.next, next.prev = h, h
return this
}
type tickHandler struct {
tickHandlerBase
base int64
totalTick int64
onTick func(tick int64) // tick = 1..totalTick
self coroutine.Thread
}
// Stop stops listening `onTick` event.
func (p *tickHandler) Stop() {
p.removeFromList()
}
// -------------------------------------------------------------------------------------
type tickMgr struct {
tick int64
currentTPS float64
list tickHandlerBase
}
// currentTPS is the current TPS (ticks per second),
// that represents how many update function is called in a second.
func getCurrentTPS() float64 {
if tps := ebiten.CurrentTPS(); tps != 0 {
return tps
}
return ebiten.DefaultTPS
}
func (p *tickMgr) init() {
p.currentTPS = getCurrentTPS()
p.list.initList()
}
func (p *tickMgr) start(totalTick int64, onTick func(tick int64)) *tickHandler {
if totalTick == -1 {
totalTick = (1 << 63) - 1
}
base := atomic.LoadInt64(&p.tick)
return p.list.insertNext(&tickHandler{
base: base,
totalTick: totalTick,
onTick: onTick,
self: gco.Current(),
})
}
func (p *tickMgr) update() {
curr := atomic.AddInt64(&p.tick, 1)
gco.CreateAndStart(true, nil, func(me coroutine.Thread) int {
var next *tickHandlerBase
tail := &p.list
for h := tail.next; h != tail; h = next {
next = h.next
this := (*tickHandler)(unsafe.Pointer(h))
tick := curr - this.base
if this.self.Stopped() {
tick = this.totalTick // ensure the last tick is always called
}
if tick >= this.totalTick {
h.removeFromList()
}
this.onTick(tick)
}
return 0
})
}
// -------------------------------------------------------------------------------------