ebiten/run.go

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// Copyright 2014 Hajime Hoshi
//
// 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.
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package ebiten
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import (
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"sync/atomic"
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"github.com/hajimehoshi/ebiten/v2/internal/clock"
"github.com/hajimehoshi/ebiten/v2/internal/ui"
)
// Game defines necessary functions for a game.
type Game interface {
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// Update updates a game by one tick. The given argument represents a screen image.
//
// Update updates only the game logic and Draw draws the screen.
//
// You can assume that Update is always called TPS-times per second (60 by default), and you can assume
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// that the time delta between two Updates is always 1 / TPS [s] (1/60[s] by default). As Ebitengine already
// adjusts the number of Update calls, you don't have to measure time deltas in Update by e.g. OS timers.
//
// An actual TPS is available by ActualTPS(), and the result might slightly differ from your expected TPS,
// but still, your game logic should stick to the fixed time delta and should not rely on ActualTPS() value.
// This API is for just measurement and/or debugging. In the long run, the number of Update calls should be
// adjusted based on the set TPS on average.
//
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// An actual time delta between two Updates might be bigger than expected. In this case, your game's
// Update or Draw takes longer than they should. In this case, there is nothing other than optimizing
// your game implementation.
//
// In the first frame, it is ensured that Update is called at least once before Draw. You can use Update
// to initialize the game state.
//
// After the first frame, Update might not be called or might be called once
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// or more for one frame. The frequency is determined by the current TPS (tick-per-second).
Update() error
// Draw draws the game screen by one frame.
//
// The give argument represents a screen image. The updated content is adopted as the game screen.
//
// The frequency of Draw calls depends on the user's environment, especially the monitors refresh rate.
// For portability, you should not put your game logic in Draw in general.
Draw(screen *Image)
// Layout accepts a native outside size in device-independent pixels and returns the game's logical screen
// size.
//
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// On desktops, the outside is a window or a monitor (fullscreen mode). On browsers, the outside is a body
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// element. On mobiles, the outside is the view's size.
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//
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// Even though the outside size and the screen size differ, the rendering scale is automatically adjusted to
// fit with the outside.
//
// Layout is called almost every frame.
//
// It is ensured that Layout is invoked before Update is called in the first frame.
//
// If Layout returns non-positive numbers, the caller can panic.
//
// You can return a fixed screen size if you don't care, or you can also return a calculated screen size
// adjusted with the given outside size.
Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int)
}
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// DefaultTPS represents a default ticks per second, that represents how many times game updating happens in a second.
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const DefaultTPS = clock.DefaultTPS
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// ActualFPS returns the current number of FPS (frames per second), that represents
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// how many swapping buffer happens per second.
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//
// On some environments, ActualFPS doesn't return a reliable value since vsync doesn't work well there.
// If you want to measure the application's speed, Use ActualTPS.
//
// This value is for measurement and/or debug, and your game logic should not rely on this value.
//
// ActualFPS is concurrent-safe.
func ActualFPS() float64 {
return clock.ActualFPS()
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}
// CurrentFPS returns the current number of FPS (frames per second), that represents
// how many swapping buffer happens per second.
//
// Deprecated: as of v2.4. Use ActualFPS instead.
func CurrentFPS() float64 {
return ActualFPS()
}
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var (
isRunGameEnded_ = int32(0)
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)
// SetScreenClearedEveryFrame enables or disables the clearing of the screen at the beginning of each frame.
// The default value is true and the screen is cleared each frame by default.
//
// SetScreenClearedEveryFrame is concurrent-safe.
func SetScreenClearedEveryFrame(cleared bool) {
ui.SetScreenClearedEveryFrame(cleared)
}
// IsScreenClearedEveryFrame returns true if the frame isn't cleared at the beginning.
//
// IsScreenClearedEveryFrame is concurrent-safe.
func IsScreenClearedEveryFrame() bool {
return ui.IsScreenClearedEveryFrame()
}
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// SetScreenFilterEnabled enables/disables the use of the "screen" filter Ebitengine uses.
//
// The "screen" filter is a box filter from game to display resolution.
//
// If disabled, nearest-neighbor filtering will be used for scaling instead.
//
// The default state is true.
//
// SetScreenFilterEnabled is concurrent-safe, but takes effect only at the next Draw call.
func SetScreenFilterEnabled(enabled bool) {
ui.SetScreenFilterEnabled(enabled)
}
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// IsScreenFilterEnabled returns true if Ebitengine's "screen" filter is enabled.
//
// IsScreenFilterEnabled is concurrent-safe.
func IsScreenFilterEnabled() bool {
return ui.IsScreenFilterEnabled()
}
type imageDumperGame struct {
game Game
d *imageDumper
err error
}
func (i *imageDumperGame) Update() error {
if i.err != nil {
return i.err
}
if i.d == nil {
i.d = &imageDumper{g: i.game}
}
return i.d.update()
}
func (i *imageDumperGame) Draw(screen *Image) {
if i.err != nil {
return
}
i.game.Draw(screen)
i.err = i.d.dump(screen)
}
func (i *imageDumperGame) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
return i.game.Layout(outsideWidth, outsideHeight)
}
// RunGame starts the main loop and runs the game.
// game's Update function is called every tick to update the game logic.
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// game's Draw function is called every frame to draw the screen.
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// game's Layout function is called when necessary, and you can specify the logical screen size by the function.
//
// game's functions are called on the same goroutine.
//
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// On browsers, it is strongly recommended to use iframe if you embed an Ebitengine application in your website.
//
// RunGame must be called on the main thread.
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// Note that Ebitengine bounds the main goroutine to the main OS thread by runtime.LockOSThread.
//
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// Ebitengine tries to call game's Update function 60 times a second by default. In other words,
// TPS (ticks per second) is 60 by default.
// This is not related to framerate (display's refresh rate).
//
// RunGame returns error when 1) an error happens in the underlying graphics driver, 2) an audio error happens
// or 3) f returns an error. In the case of 3), RunGame returns the same error so far, but it is recommended to
// use errors.Is when you check the returned error is the error you want, rather than comparing the values
// with == or != directly.
//
// The size unit is device-independent pixel.
//
// Don't call RunGame twice or more in one process.
func RunGame(game Game) error {
defer atomic.StoreInt32(&isRunGameEnded_, 1)
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initializeWindowPositionIfNeeded(WindowSize())
g := newGameForUI(&imageDumperGame{
game: game,
})
if err := ui.Get().Run(g); err != nil {
if err == ui.RegularTermination {
return nil
}
return err
}
return nil
}
func isRunGameEnded() bool {
return atomic.LoadInt32(&isRunGameEnded_) != 0
}
// ScreenSizeInFullscreen returns the size in device-independent pixels when the game is fullscreen.
// The adopted monitor is the 'current' monitor which the window belongs to.
// The returned value can be given to Run or SetSize function if the perfectly fit fullscreen is needed.
//
// On browsers, ScreenSizeInFullscreen returns the 'window' (global object) size, not 'screen' size.
// ScreenSizeInFullscreen's returning value is different from the actual screen size and this is a known issue (#2145).
// For browsers, it is recommended to use Screen API (https://developer.mozilla.org/en-US/docs/Web/API/Screen) if needed.
//
// On mobiles, ScreenSizeInFullscreen returns (0, 0) so far.
//
// ScreenSizeInFullscreen's use cases are limited. If you are making a fullscreen application, you can use RunGame and
// the Game interface's Layout function instead. If you are making a not-fullscreen application but the application's
// behavior depends on the monitor size, ScreenSizeInFullscreen is useful.
//
// ScreenSizeInFullscreen must be called on the main thread before ebiten.Run, and is concurrent-safe after
// ebiten.Run.
func ScreenSizeInFullscreen() (int, int) {
return ui.Get().ScreenSizeInFullscreen()
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}
// CursorMode returns the current cursor mode.
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//
// CursorMode returns CursorModeHidden on mobiles.
//
// CursorMode is concurrent-safe.
func CursorMode() CursorModeType {
return ui.Get().CursorMode()
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}
// SetCursorMode sets the render and capture mode of the mouse cursor.
// CursorModeVisible sets the cursor to always be visible.
// CursorModeHidden hides the system cursor when over the window.
// CursorModeCaptured hides the system cursor and locks it to the window.
//
// CursorModeCaptured also works on browsers.
// When the user exits the captured mode not by SetCursorMode but by the UI (e.g., pressing ESC),
// the previous cursor mode is set automatically.
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//
// SetCursorMode does nothing on mobiles.
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//
// SetCursorMode is concurrent-safe.
func SetCursorMode(mode CursorModeType) {
ui.Get().SetCursorMode(mode)
}
// CursorShape returns the current cursor shape.
//
// CursorShape returns CursorShapeDefault on mobiles.
//
// CursorShape is concurrent-safe.
func CursorShape() CursorShapeType {
return ui.Get().CursorShape()
}
// SetCursorShape sets the cursor shape.
//
// SetCursorShape is concurrent-safe.
func SetCursorShape(shape CursorShapeType) {
ui.Get().SetCursorShape(shape)
}
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// IsFullscreen reports whether the current mode is fullscreen or not.
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//
// IsFullscreen always returns false on mobiles.
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//
// IsFullscreen is concurrent-safe.
func IsFullscreen() bool {
return ui.Get().IsFullscreen()
}
// SetFullscreen changes the current mode to fullscreen or not on desktops and browsers.
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//
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// In fullscreen mode, the game screen is automatically enlarged
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// to fit with the monitor. The current scale value is ignored.
//
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// On desktops, Ebitengine uses 'windowed' fullscreen mode, which doesn't change
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// your monitor's resolution.
//
// On browsers, triggering fullscreen requires a user gesture otherwise SetFullscreen does nothing but leave an error message in console.
// This behaviour varies across browser implementations, your mileage may vary.
//
// SetFullscreen does nothing on mobiles.
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//
// SetFullscreen does nothing on macOS when the window is fullscreened natively by the macOS desktop
// instead of SetFullscreen(true).
//
// SetFullscreen is concurrent-safe.
func SetFullscreen(fullscreen bool) {
ui.Get().SetFullscreen(fullscreen)
}
// IsFocused returns a boolean value indicating whether
// the game is in focus or in the foreground.
//
// IsFocused will only return true if IsRunnableOnUnfocused is false.
//
// IsFocused is concurrent-safe.
func IsFocused() bool {
return ui.Get().IsFocused()
}
// IsRunnableOnUnfocused returns a boolean value indicating whether
// the game runs even in background.
//
// IsRunnableOnUnfocused is concurrent-safe.
func IsRunnableOnUnfocused() bool {
return ui.Get().IsRunnableOnUnfocused()
}
// SetRunnableOnUnfocused sets the state if the game runs even in background.
//
// If the given value is true, the game runs even in background e.g. when losing focus.
// The initial state is true.
//
// Known issue: On browsers, even if the state is on, the game doesn't run in background tabs.
// This is because browsers throttles background tabs not to often update.
//
// SetRunnableOnUnfocused does nothing on mobiles so far.
//
// SetRunnableOnUnfocused is concurrent-safe.
func SetRunnableOnUnfocused(runnableOnUnfocused bool) {
ui.Get().SetRunnableOnUnfocused(runnableOnUnfocused)
}
// DeviceScaleFactor returns a device scale factor value of the current monitor which the window belongs to.
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//
// DeviceScaleFactor returns a meaningful value on high-DPI display environment,
// otherwise DeviceScaleFactor returns 1.
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//
// DeviceScaleFactor might panic on init function on some devices like Android.
// Then, it is not recommended to call DeviceScaleFactor from init functions.
//
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// DeviceScaleFactor must be called on the main thread before the main loop, and is concurrent-safe after the main
// loop.
//
// DeviceScaleFactor is concurrent-safe.
//
// BUG: DeviceScaleFactor value is not affected by SetWindowPosition before RunGame (#1575).
func DeviceScaleFactor() float64 {
return ui.Get().DeviceScaleFactor()
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}
// IsVsyncEnabled returns a boolean value indicating whether
// the game uses the display's vsync.
//
// Deprecated: as of v2.2. Use FPSMode instead.
func IsVsyncEnabled() bool {
return ui.FPSMode() == ui.FPSModeVsyncOn
}
// SetVsyncEnabled sets a boolean value indicating whether
// the game uses the display's vsync.
//
// Deprecated: as of v2.2. Use SetFPSMode instead.
func SetVsyncEnabled(enabled bool) {
if enabled {
ui.SetFPSMode(ui.FPSModeVsyncOn)
} else {
ui.SetFPSMode(ui.FPSModeVsyncOffMaximum)
}
}
// FPSModeType is a type of FPS modes.
type FPSModeType = ui.FPSModeType
const (
// FPSModeVsyncOn indicates that the game tries to sync the display's refresh rate.
// FPSModeVsyncOn is the default mode.
FPSModeVsyncOn FPSModeType = ui.FPSModeVsyncOn
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// FPSModeVsyncOffMaximum indicates that the game doesn't sync with vsync, and
// the game is updated whenever possible.
//
// Be careful that FPSModeVsyncOffMaximum might consume a lot of battery power.
//
// In FPSModeVsyncOffMaximum, the game's Draw is called almost without sleeping.
// The game's Update is called based on the specified TPS.
FPSModeVsyncOffMaximum FPSModeType = ui.FPSModeVsyncOffMaximum
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// FPSModeVsyncOffMinimum indicates that the game doesn't sync with vsync, and
// the game is updated only when necessary.
//
// FPSModeVsyncOffMinimum is useful for relatively static applications to save battery power.
//
// In FPSModeVsyncOffMinimum, the game's Update and Draw are called only when
// 1) new inputting except for gamepads is detected, or 2) ScheduleFrame is called.
// In FPSModeVsyncOffMinimum, TPS is SyncWithFPS no matter what TPS is specified at SetTPS.
FPSModeVsyncOffMinimum FPSModeType = ui.FPSModeVsyncOffMinimum
)
// FPSMode returns the current FPS mode.
//
// FPSMode is concurrent-safe.
func FPSMode() FPSModeType {
return ui.FPSMode()
}
// SetFPSMode sets the FPS mode.
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// The default FPS mode is FPSModeVsyncOn.
//
// SetFPSMode is concurrent-safe.
func SetFPSMode(mode FPSModeType) {
ui.SetFPSMode(mode)
}
// ScheduleFrame schedules a next frame when the current FPS mode is FPSModeVsyncOffMinimum.
//
// ScheduleFrame is concurrent-safe.
func ScheduleFrame() {
ui.Get().ScheduleFrame()
}
// TPS returns the current maximum TPS.
//
// TPS is concurrent-safe.
func TPS() int {
return clock.TPS()
}
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// MaxTPS returns the current maximum TPS.
//
// Deprecated: as of v2.4. Use TPS instead.
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func MaxTPS() int {
return TPS()
}
// ActualTPS returns the current TPS (ticks per second),
// that represents how many Update function is called in a second.
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//
// This value is for measurement and/or debug, and your game logic should not rely on this value.
//
// ActualTPS is concurrent-safe.
func ActualTPS() float64 {
return clock.ActualTPS()
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}
// CurrentTPS returns the current TPS (ticks per second),
// that represents how many Update function is called in a second.
//
// Deprecated: as of v2.4. Use ActualTPS instead.
func CurrentTPS() float64 {
return ActualTPS()
}
// SyncWithFPS is a special TPS value that means TPS syncs with FPS.
const SyncWithFPS = clock.SyncWithFPS
// UncappedTPS is a special TPS value that means TPS syncs with FPS.
//
// Deprecated: as of v2.2. Use SyncWithFPS instead.
const UncappedTPS = SyncWithFPS
// SetTPS sets the maximum TPS (ticks per second),
// that represents how many updating function is called per second.
// The initial value is 60.
//
// If tps is SyncWithFPS, TPS is uncapped and the game is updated per frame.
// If tps is negative but not SyncWithFPS, SetTPS panics.
//
// SetTPS is concurrent-safe.
func SetTPS(tps int) {
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clock.SetTPS(tps)
}
// SetMaxTPS sets the maximum TPS (ticks per second),
// that represents how many updating function is called per second.
//
// Deprecated: as of v2.4. Use SetTPS instead.
func SetMaxTPS(tps int) {
SetTPS(tps)
}
// IsScreenTransparent reports whether the window is transparent.
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//
// IsScreenTransparent is concurrent-safe.
func IsScreenTransparent() bool {
return ui.Get().IsScreenTransparent()
}
// SetScreenTransparent sets the state if the window is transparent.
//
// SetScreenTransparent panics if SetScreenTransparent is called after the main loop.
//
// SetScreenTransparent does nothing on mobiles.
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//
// SetScreenTransparent is concurrent-safe.
func SetScreenTransparent(transparent bool) {
ui.Get().SetScreenTransparent(transparent)
}
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// SetInitFocused sets whether the application is focused on show.
// The default value is true, i.e., the application is focused.
// Note that the application does not proceed if this is not focused by default.
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// This behavior can be changed by SetRunnableOnUnfocused.
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//
// SetInitFocused does nothing on mobile.
//
// SetInitFocused panics if this is called after the main loop.
//
// SetInitFocused is cuncurrent-safe.
func SetInitFocused(focused bool) {
ui.Get().SetInitFocused(focused)
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}