doodle/scene.go

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package doodle
import "git.kirsle.net/apps/doodle/events"
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// Scene is an abstraction for a game mode in Doodle. The app points to one
// scene at a time and that scene has control over the main loop, and its own
// state information.
type Scene interface {
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Name() string
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Setup(*Doodle) error
Destroy() error
// Loop should update the scene's state but not draw anything.
Loop(*Doodle, *events.State) error
// Draw should use the scene's state to figure out what pixels need
// to draw to the screen.
Draw(*Doodle) error
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}
// Goto a scene. First it unloads the current scene.
func (d *Doodle) Goto(scene Scene) error {
// Teardown existing scene.
if d.Scene != nil {
d.Scene.Destroy()
}
log.Info("Goto Scene: %s", scene.Name())
d.Scene = scene
return d.Scene.Setup(d)
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}