ebiten/internal/uidriver/glfw/run_notsinglethread.go

91 lines
2.3 KiB
Go
Raw Normal View History

// Copyright 2020 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.
// +build !ebitensinglethread
// +build darwin freebsd linux windows
// +build !android
// +build !ios
package glfw
import (
"github.com/hajimehoshi/ebiten/v2/internal/driver"
"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
"github.com/hajimehoshi/ebiten/v2/internal/thread"
)
func (u *UserInterface) Run(uicontext driver.UIContext) error {
u.context = uicontext
// Initialize the main thread first so the thread is available at u.run (#809).
u.t = thread.NewOSThread()
graphicscommand.SetMainThread(u.t)
ch := make(chan error, 1)
go func() {
defer func() {
_ = u.t.Call(func() error {
return thread.BreakLoop
})
}()
defer close(ch)
_ = u.t.Call(func() error {
if err := u.init(); err != nil {
ch <- err
}
return nil
})
if err := u.loop(); err != nil {
ch <- err
}
}()
u.setRunning(true)
u.t.Loop()
u.setRunning(false)
return <-ch
}
// runOnAnotherThreadFromMainThread is called from the main thread, and calls f on a new goroutine (thread).
// runOnAnotherThreadFromMainThread creates a new nested main thread and runs the run loop.
// u.t is updated to the new thread until runOnAnotherThreadFromMainThread is called.
//
// Inside f, another functions that must be called from the main thread can be called safely.
func (u *UserInterface) runOnAnotherThreadFromMainThread(f func() error) error {
// As this function is called from the main thread, u.t should never be accessed and can be updated here.
t := u.t
defer func() {
u.t = t
graphicscommand.SetMainThread(t)
}()
u.t = thread.NewOSThread()
graphicscommand.SetMainThread(u.t)
var err error
go func() {
defer func() {
_ = u.t.Call(func() error {
return thread.BreakLoop
})
}()
err = f()
}()
u.t.Loop()
return err
}