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ui.go
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ui.go
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// Copyright 2022 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 ui
import (
"errors"
"image"
"sync"
"sync/atomic"
_ "github.com/ebitengine/hideconsole"
"github.com/hajimehoshi/ebiten/v2/internal/atlas"
"github.com/hajimehoshi/ebiten/v2/internal/mipmap"
"github.com/hajimehoshi/ebiten/v2/internal/thread"
)
// RegularTermination represents a regular termination.
// Run can return this error, and if this error is received,
// the game loop should be terminated as soon as possible.
var RegularTermination = errors.New("regular termination")
type FPSModeType int
const (
FPSModeVsyncOn FPSModeType = iota
FPSModeVsyncOffMaximum
FPSModeVsyncOffMinimum
)
type CursorMode int
const (
CursorModeVisible CursorMode = iota
CursorModeHidden
CursorModeCaptured
)
type CursorShape int
const (
CursorShapeDefault CursorShape = iota
CursorShapeText
CursorShapeCrosshair
CursorShapePointer
CursorShapeEWResize
CursorShapeNSResize
CursorShapeNESWResize
CursorShapeNWSEResize
CursorShapeMove
CursorShapeNotAllowed
)
type WindowResizingMode int
const (
WindowResizingModeDisabled WindowResizingMode = iota
WindowResizingModeOnlyFullscreenEnabled
WindowResizingModeEnabled
)
type UserInterface struct {
err error
errM sync.Mutex
isScreenClearedEveryFrame int32
graphicsLibrary int32
running int32
terminated int32
whiteImage *Image
mainThread thread.Thread
userInterfaceImpl
}
var (
theUI *UserInterface
)
func init() {
// newUserInterface() must be called in the main goroutine.
u, err := newUserInterface()
if err != nil {
panic(err)
}
theUI = u
}
func Get() *UserInterface {
return theUI
}
// newUserInterface must be called from the main thread.
func newUserInterface() (*UserInterface, error) {
u := &UserInterface{
isScreenClearedEveryFrame: 1,
graphicsLibrary: int32(GraphicsLibraryUnknown),
}
u.whiteImage = u.NewImage(3, 3, atlas.ImageTypeRegular)
pix := make([]byte, 4*u.whiteImage.width*u.whiteImage.height)
for i := range pix {
pix[i] = 0xff
}
// As a white image is used at Fill, use WritePixels instead.
u.whiteImage.WritePixels(pix, image.Rect(0, 0, u.whiteImage.width, u.whiteImage.height))
if err := u.init(); err != nil {
return nil, err
}
return u, nil
}
func (u *UserInterface) readPixels(mipmap *mipmap.Mipmap, pixels []byte, region image.Rectangle) error {
ok, err := mipmap.ReadPixels(u.graphicsDriver, pixels, region)
if err != nil {
return err
}
// ReadPixels failed since this was called in between two frames.
// Try this again at the next frame.
if !ok {
// If this function is called from the same sequence as a game's Update and Draw,
// this causes a dead lock.
// This never happens so far, but if handling inputs after EndFrame is implemented,
// this might be possible (#1704).
var err1 error
u.context.runInFrame(func() {
ok, err := mipmap.ReadPixels(u.graphicsDriver, pixels, region)
if err != nil {
err1 = err
return
}
if !ok {
// This never reaches since this function must be called in a frame.
panic("ui: ReadPixels unexpectedly failed")
}
})
return err1
}
return nil
}
func (u *UserInterface) dumpScreenshot(mipmap *mipmap.Mipmap, name string, blackbg bool) (string, error) {
return mipmap.DumpScreenshot(u.graphicsDriver, name, blackbg)
}
func (u *UserInterface) dumpImages(dir string) (string, error) {
return atlas.DumpImages(u.graphicsDriver, dir)
}
type RunOptions struct {
GraphicsLibrary GraphicsLibrary
InitUnfocused bool
ScreenTransparent bool
SkipTaskbar bool
SingleThread bool
X11ClassName string
X11InstanceName string
}
// InitialWindowPosition returns the position for centering the given second width/height pair within the first width/height pair.
func InitialWindowPosition(mw, mh, ww, wh int) (x, y int) {
return (mw - ww) / 2, (mh - wh) / 3
}
func (u *UserInterface) error() error {
u.errM.Lock()
defer u.errM.Unlock()
return u.err
}
func (u *UserInterface) setError(err error) {
u.errM.Lock()
defer u.errM.Unlock()
if u.err == nil {
u.err = err
}
}
func (u *UserInterface) IsScreenClearedEveryFrame() bool {
return atomic.LoadInt32(&u.isScreenClearedEveryFrame) != 0
}
func (u *UserInterface) SetScreenClearedEveryFrame(cleared bool) {
v := int32(0)
if cleared {
v = 1
}
atomic.StoreInt32(&u.isScreenClearedEveryFrame, v)
}
func (u *UserInterface) setGraphicsLibrary(library GraphicsLibrary) {
atomic.StoreInt32(&u.graphicsLibrary, int32(library))
}
func (u *UserInterface) GraphicsLibrary() GraphicsLibrary {
return GraphicsLibrary(atomic.LoadInt32(&u.graphicsLibrary))
}
func (u *UserInterface) isRunning() bool {
return atomic.LoadInt32(&u.running) != 0 && !u.isTerminated()
}
func (u *UserInterface) setRunning(running bool) {
if running {
atomic.StoreInt32(&u.running, 1)
} else {
atomic.StoreInt32(&u.running, 0)
}
}
func (u *UserInterface) isTerminated() bool {
return atomic.LoadInt32(&u.terminated) != 0
}
func (u *UserInterface) setTerminated() {
atomic.StoreInt32(&u.terminated, 1)
}