89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package d2scene
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import (
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"github.com/OpenDiablo2/OpenDiablo2/d2core/d2gui"
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"github.com/OpenDiablo2/OpenDiablo2/d2core/d2render"
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"github.com/OpenDiablo2/OpenDiablo2/d2core/d2ui"
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)
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type Scene interface{}
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type SceneLoadHandler interface {
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OnLoad() error
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}
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type SceneUnloadHandler interface {
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OnUnload() error
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}
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type SceneRenderHandler interface {
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Render(target d2render.Surface) error
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}
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type SceneAdvanceHandler interface {
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Advance(elapsed float64) error
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}
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var singleton struct {
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nextScene Scene
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loadingScene Scene
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currentScene Scene
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}
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func SetNextScene(scene Scene) {
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singleton.nextScene = scene
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}
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func Advance(elapsed float64) error {
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if singleton.nextScene != nil {
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if handler, ok := singleton.currentScene.(SceneUnloadHandler); ok {
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if err := handler.OnUnload(); err != nil {
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return err
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}
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}
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d2ui.Reset()
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d2gui.SetLayout(nil)
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if _, ok := singleton.nextScene.(SceneLoadHandler); ok {
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d2gui.ShowLoadScreen(0)
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d2gui.HideCursor()
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singleton.currentScene = nil
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singleton.loadingScene = singleton.nextScene
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} else {
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singleton.currentScene = singleton.nextScene
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singleton.loadingScene = nil
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}
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singleton.nextScene = nil
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} else if singleton.loadingScene != nil {
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handler := singleton.loadingScene.(SceneLoadHandler)
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if err := handler.OnLoad(); err != nil {
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return err
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}
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singleton.currentScene = singleton.loadingScene
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singleton.loadingScene = nil
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d2gui.ShowCursor()
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d2gui.HideLoadScreen()
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} else if singleton.currentScene != nil {
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if handler, ok := singleton.currentScene.(SceneAdvanceHandler); ok {
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if err := handler.Advance(elapsed); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func Render(surface d2render.Surface) error {
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if handler, ok := singleton.currentScene.(SceneRenderHandler); ok {
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if err := handler.Render(surface); err != nil {
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return err
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}
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}
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return nil
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}
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