mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
// Copyright 2020 The Ebiten 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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//go:build !android && !ios && !js && !nintendosdk && !ebitenginesinglethread && !ebitensinglethread
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package ui
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import (
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stdcontext "context"
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"errors"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
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"github.com/hajimehoshi/ebiten/v2/internal/thread"
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)
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func (u *userInterfaceImpl) Run(game Game, options *RunOptions) error {
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u.context = newContext(game)
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// Initialize the main thread first so the thread is available at u.run (#809).
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u.mainThread = thread.NewOSThread()
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graphicscommand.SetRenderThread(u.mainThread)
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u.setRunning(true)
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defer u.setRunning(false)
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if err := u.init(options); err != nil {
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return err
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}
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ctx, cancel := stdcontext.WithCancel(stdcontext.Background())
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defer cancel()
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ch := make(chan error, 1)
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go func() {
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defer close(ch)
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if err := u.loopGame(); err != nil {
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ch <- err
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cancel()
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return
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}
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}()
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err := u.mainThread.Loop(ctx)
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if errors.Is(err, stdcontext.Canceled) {
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return <-ch
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}
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return err
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}
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// runOnAnotherThreadFromMainThread is called from the main thread, and calls f on a new goroutine (thread).
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// runOnAnotherThreadFromMainThread creates a new nested main thread and runs the run loop.
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// u.mainThread is updated to the new thread until runOnAnotherThreadFromMainThread is called.
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//
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// Inside f, another functions that must be called from the main thread can be called safely.
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func (u *userInterfaceImpl) runOnAnotherThreadFromMainThread(f func()) {
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// As this function is called from the main thread, u.mainThread should never be accessed and can be updated here.
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t := u.mainThread
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defer func() {
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u.mainThread = t
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graphicscommand.SetRenderThread(t)
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}()
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u.mainThread = thread.NewOSThread()
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graphicscommand.SetRenderThread(u.mainThread)
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ctx, cancel := stdcontext.WithCancel(stdcontext.Background())
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defer cancel()
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go func() {
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defer cancel()
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f()
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}()
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_ = u.mainThread.Loop(ctx)
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}
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