Fixed UI bugs. Added credits scene.

Common/Sprite.go

@@ -112,7 +112,7 @@ func CreateSprite(data []byte, palette Palette) *Sprite {
 			result.Frames[ix].Image, _ = ebiten.NewImage(int(result.Frames[ix].Width), int(result.Frames[ix].Height), ebiten.FilterNearest)
 			newData := make([]byte, result.Frames[ix].Width*result.Frames[ix].Height*4)
 			for ii := uint32(0); ii < result.Frames[ix].Width*result.Frames[ix].Height; ii++ {
-				if result.Frames[ix].ImageData[ii] == -1 {
+				if result.Frames[ix].ImageData[ii] < 1 { // TODO: Is this == -1 or < 1?
 					continue
 				}
 				newData[ii*4] = palette.Colors[result.Frames[ix].ImageData[ii]].R

Engine.go

@@ -63,7 +63,7 @@ func CreateEngine() *Engine {
 	result.LoadingSprite = result.LoadSprite(ResourcePaths.LoadingScreen, Palettes.Loading)
 	loadingSpriteSizeX, loadingSpriteSizeY := result.LoadingSprite.GetSize()
 	result.LoadingSprite.MoveTo(int(400-(loadingSpriteSizeX/2)), int(300+(loadingSpriteSizeY/2)))
-	result.SetNextScene(Scenes.CreateMainMenu(result, result.UIManager, result.SoundManager))
+	result.SetNextScene(Scenes.CreateMainMenu(result, result, result.UIManager, result.SoundManager))
 	return result
 }
 

Scenes/Credits.go

@@ -0,0 +1,54 @@
+package Scenes
+
+import (
+	"github.com/essial/OpenDiablo2/Common"
+	"github.com/essial/OpenDiablo2/Palettes"
+	"github.com/essial/OpenDiablo2/ResourcePaths"
+	"github.com/essial/OpenDiablo2/Sound"
+	"github.com/essial/OpenDiablo2/UI"
+	"github.com/hajimehoshi/ebiten"
+)
+
+// Credits represents the credits scene
+type Credits struct {
+	uiManager         *UI.Manager
+	soundManager      *Sound.Manager
+	fileProvider      Common.FileProvider
+	sceneProvider     SceneProvider
+	creditsBackground *Common.Sprite
+}
+
+// CreateCredits creates an instance of the credits scene
+func CreateCredits(fileProvider Common.FileProvider, sceneProvider SceneProvider, uiManager *UI.Manager, soundManager *Sound.Manager) *Credits {
+	result := &Credits{
+		fileProvider:  fileProvider,
+		uiManager:     uiManager,
+		soundManager:  soundManager,
+		sceneProvider: sceneProvider,
+	}
+	return result
+}
+
+// Load is called to load the resources for the credits scene
+func (v *Credits) Load() []func() {
+	return []func(){
+		func() {
+			v.creditsBackground = v.fileProvider.LoadSprite(ResourcePaths.CreditsBackground, Palettes.Sky)
+		},
+	}
+}
+
+// Unload unloads the data for the credits scene
+func (v *Credits) Unload() {
+
+}
+
+// Render renders the credits scene
+func (v *Credits) Render(screen *ebiten.Image) {
+	v.creditsBackground.DrawSegments(screen, 4, 3, 0)
+}
+
+// Update runs the update logic on the credits scene
+func (v *Credits) Update() {
+
+}

Scenes/MainMenu.go

@@ -18,6 +18,7 @@ type MainMenu struct {
 	uiManager           *UI.Manager
 	soundManager        *Sound.Manager
 	fileProvider        Common.FileProvider
+	sceneProvider       SceneProvider
 	trademarkBackground *Common.Sprite
 	background          *Common.Sprite
 	diabloLogoLeft      *Common.Sprite
@@ -33,11 +34,12 @@ type MainMenu struct {
 }
 
 // CreateMainMenu creates an instance of MainMenu
-func CreateMainMenu(fileProvider Common.FileProvider, uiManager *UI.Manager, soundManager *Sound.Manager) *MainMenu {
+func CreateMainMenu(fileProvider Common.FileProvider, sceneProvider SceneProvider, uiManager *UI.Manager, soundManager *Sound.Manager) *MainMenu {
 	result := &MainMenu{
 		fileProvider:        fileProvider,
 		uiManager:           uiManager,
 		soundManager:        soundManager,
+		sceneProvider:       sceneProvider,
 		showTrademarkScreen: true,
 	}
 	return result
@@ -100,6 +102,7 @@ func (v *MainMenu) Load() []func() {
 			v.creditsButton = UI.CreateButton(UI.ButtonTypeShort, v.fileProvider, "CREDITS")
 			v.creditsButton.MoveTo(264, 505)
 			v.creditsButton.SetVisible(false)
+			v.creditsButton.OnActivated(func() { v.onCreditsButtonClicked() })
 			v.uiManager.AddWidget(v.creditsButton)
 		},
 	}
@@ -109,6 +112,10 @@ func (v *MainMenu) onExitButtonClicked() {
 	os.Exit(0)
 }
 
+func (v *MainMenu) onCreditsButtonClicked() {
+	v.sceneProvider.SetNextScene(CreateCredits(v.fileProvider, v.sceneProvider, v.uiManager, v.soundManager))
+}
+
 // Unload unloads the data for the main menu
 func (v *MainMenu) Unload() {
 

Scenes/SceneProvider.go

@@ -0,0 +1,6 @@
+package Scenes
+
+// SceneProvider provides the ability to change scenes
+type SceneProvider interface {
+	SetNextScene(nextScene Scene)
+}

Sound/AudioProvider.go

@@ -13,6 +13,7 @@ type Manager struct {
 	fileProvider Common.FileProvider
 	audioContext *audio.Context // The Audio context
 	bgmAudio     *audio.Player  // The audio player
+	lastBgm      string
 }
 
 // CreateManager creates a sound provider
@@ -30,6 +31,10 @@ func CreateManager(fileProvider Common.FileProvider) *Manager {
 
 // PlayBGM plays an infinitely looping background track
 func (v *Manager) PlayBGM(song string) {
+	if v.lastBgm == song {
+		return
+	}
+	v.lastBgm = song
 	go func() {
 		if v.bgmAudio != nil {
 			v.bgmAudio.Close()