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// SPDX-License-Identifier: Unlicense OR MIT
package gpu
import (
"time"
"gioui.org/gpu/backend"
)
type timers struct {
backend backend.Device
timers []*timer
}
type timer struct {
Elapsed time.Duration
backend backend.Device
timer backend.Timer
state timerState
}
type timerState uint8
const (
timerIdle timerState = iota
timerRunning
timerWaiting
)
func newTimers(b backend.Device) *timers {
return &timers{
backend: b,
}
}
func (t *timers) newTimer() *timer {
if t == nil {
return nil
}
tt := &timer{
backend: t.backend,
timer: t.backend.NewTimer(),
}
t.timers = append(t.timers, tt)
return tt
}
func (t *timer) begin() {
if t == nil || t.state != timerIdle {
return
}
t.timer.Begin()
t.state = timerRunning
}
func (t *timer) end() {
if t == nil || t.state != timerRunning {
return
}
t.timer.End()
t.state = timerWaiting
}
func (t *timers) ready() bool {
if t == nil {
return false
}
for _, tt := range t.timers {
switch tt.state {
case timerIdle:
continue
case timerRunning:
return false
}
d, ok := tt.timer.Duration()
if !ok {
return false
}
tt.state = timerIdle
tt.Elapsed = d
}
return t.backend.IsTimeContinuous()
}
func (t *timers) release() {
if t == nil {
return
}
for _, tt := range t.timers {
tt.timer.Release()
}
t.timers = nil
}
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