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command.go
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command.go
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// Copyright 2019 The Ebiten Authors
//
// 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 buffered
import (
"sync"
"sync/atomic"
)
var (
// delayedCommands represents a queue for image operations that are ordered before the game starts
// (BeginFrame). Before the game starts, the package shareable doesn't determine the minimum/maximum texture
// sizes (#879).
delayedCommands = []func() error{}
delayedCommandsM sync.Mutex
delayedCommandsFlushed uint32
)
func flushDelayedCommands() error {
fs := getDelayedFuncsAndClear()
for _, f := range fs {
if err := f(); err != nil {
return err
}
}
return nil
}
func getDelayedFuncsAndClear() []func() error {
if atomic.LoadUint32(&delayedCommandsFlushed) == 0 {
// Outline the slow-path to expect the fast-path is inlined.
return getDelayedFuncsAndClearSlow()
}
return nil
}
func getDelayedFuncsAndClearSlow() []func() error {
delayedCommandsM.Lock()
defer delayedCommandsM.Unlock()
if delayedCommandsFlushed == 0 {
defer atomic.StoreUint32(&delayedCommandsFlushed, 1)
fs := make([]func() error, len(delayedCommands))
copy(fs, delayedCommands)
delayedCommands = nil
return fs
}
return nil
}
// maybeCanAddDelayedCommand returns false if the delayed commands cannot be added.
// Otherwise, maybeCanAddDelayedCommand's returning value is not determined.
// For example, maybeCanAddDelayedCommand can return true even when flusing is being processed.
func maybeCanAddDelayedCommand() bool {
return atomic.LoadUint32(&delayedCommandsFlushed) == 0
}
func tryAddDelayedCommand(f func() error) bool {
delayedCommandsM.Lock()
defer delayedCommandsM.Unlock()
if delayedCommandsFlushed == 0 {
delayedCommands = append(delayedCommands, func() error {
return f()
})
return true
}
return false
}
func checkDelayedCommandsFlushed(fname string) {
if atomic.LoadUint32(&delayedCommandsFlushed) == 0 {
panic("buffered: the command queue is not available yet at " + fname)
}
}