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55702a7c28
This enables to call (*Image).At from HandleInput, which might be called outside of a frame. Updates #1704
92 lines
2.0 KiB
Go
92 lines
2.0 KiB
Go
// Copyright 2023 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package atlas
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import (
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"sync"
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)
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var (
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deferred []func()
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// deferredM is a mutex for the slice operations. This must not be used for other usages.
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deferredM sync.Mutex
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)
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func appendDeferred(f func()) {
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deferredM.Lock()
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defer deferredM.Unlock()
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deferred = append(deferred, f)
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}
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func flushDeferred() {
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deferredM.Lock()
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fs := deferred
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deferred = nil
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deferredM.Unlock()
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for _, f := range fs {
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f()
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}
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}
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type funcsInFrame struct {
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initOnce sync.Once
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funcsCh chan func()
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funcsAckCh chan struct{}
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beginFrameCh chan struct{}
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endFrameCh chan struct{}
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endFrameAckCh chan struct{}
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}
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var theFuncsInFrame funcsInFrame
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func (f *funcsInFrame) beginFrame() {
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f.initOnce.Do(func() {
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f.funcsCh = make(chan func())
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f.funcsAckCh = make(chan struct{})
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f.beginFrameCh = make(chan struct{})
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f.endFrameCh = make(chan struct{})
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f.endFrameAckCh = make(chan struct{})
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go func() {
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<-f.beginFrameCh
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for {
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select {
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case fn := <-f.funcsCh:
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fn()
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f.funcsAckCh <- struct{}{}
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case <-f.endFrameCh:
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f.endFrameAckCh <- struct{}{}
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// Wait for the next frame.
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<-f.beginFrameCh
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}
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}
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}()
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})
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f.beginFrameCh <- struct{}{}
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}
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func (f *funcsInFrame) endFrame() {
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f.endFrameCh <- struct{}{}
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// Ensure that all the queued functions are consumed and the loop is suspended.
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<-f.endFrameAckCh
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}
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func (f *funcsInFrame) runFuncInFrame(fn func()) {
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f.funcsCh <- fn
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<-f.funcsAckCh
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}
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