package d2core import ( "log" "math" "runtime" "strconv" "time" "github.com/OpenDiablo2/D2Shared/d2data/d2dc6" "github.com/OpenDiablo2/D2Shared/d2common/d2resource" "github.com/OpenDiablo2/D2Shared/d2helper" "github.com/OpenDiablo2/OpenDiablo2/d2corecommon/d2coreinterface" "github.com/OpenDiablo2/D2Shared/d2common/d2enum" "github.com/OpenDiablo2/OpenDiablo2/d2render" "github.com/OpenDiablo2/D2Shared/d2data" "github.com/OpenDiablo2/D2Shared/d2data/d2datadict" "github.com/OpenDiablo2/OpenDiablo2/d2audio" "github.com/OpenDiablo2/D2Shared/d2common" "github.com/OpenDiablo2/OpenDiablo2/d2corecommon" "github.com/OpenDiablo2/OpenDiablo2/d2render/d2ui" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/ebitenutil" "github.com/hajimehoshi/ebiten/inpututil" ) // Engine is the core OpenDiablo2 engine type Engine struct { Settings *d2corecommon.Configuration // Engine configuration settings from json file CheckedPatch map[string]bool // First time we check a file, we'll check if it's in the patch. This notes that we've already checked that. LoadingSprite d2render.Sprite // The sprite shown when loading stuff loadingProgress float64 // LoadingProcess is a range between 0.0 and 1.0. If set, loading screen displays. loadingIndex int // Determines which load function is currently being called thingsToLoad []func() // The load functions for the next scene stepLoadingSize float64 // The size for each loading step CurrentScene d2coreinterface.Scene // The current scene being rendered UIManager *d2ui.Manager // The UI manager SoundManager *d2audio.Manager // The sound manager nextScene d2coreinterface.Scene // The next scene to be loaded at the end of the game loop fullscreenKey bool // When true, the fullscreen toggle is still being pressed lastTime float64 // Last time we updated the scene showFPS bool assetManager *assetManager } // CreateEngine creates and instance of the OpenDiablo2 engine func CreateEngine() Engine { var result Engine result.loadConfigurationFile() result.assetManager = createAssetManager(result.Settings) d2resource.LanguageCode = result.Settings.Language d2datadict.LoadPalettes(nil, &result) d2common.LoadTextDictionary(&result) d2datadict.LoadLevelTypes(&result) d2datadict.LoadLevelPresets(&result) d2datadict.LoadLevelWarps(&result) d2datadict.LoadObjectTypes(&result) d2datadict.LoadObjects(&result) d2datadict.LoadWeapons(&result) d2datadict.LoadArmors(&result) d2datadict.LoadMiscItems(&result) d2datadict.LoadUniqueItems(&result) d2datadict.LoadMissiles(&result) d2datadict.LoadSounds(&result) d2data.LoadAnimationData(&result) d2datadict.LoadMonStats(&result) LoadHeroObjects() result.SoundManager = d2audio.CreateManager(&result) result.SoundManager.SetVolumes(result.Settings.BgmVolume, result.Settings.SfxVolume) result.UIManager = d2ui.CreateManager(&result, *result.SoundManager) result.LoadingSprite = result.LoadSprite(d2resource.LoadingScreen, d2enum.Loading) loadingSpriteSizeX, loadingSpriteSizeY := result.LoadingSprite.GetSize() result.LoadingSprite.MoveTo(int(400-(loadingSpriteSizeX/2)), int(300+(loadingSpriteSizeY/2))) return result } func (v *Engine) loadConfigurationFile() { log.Println("Loading configuration file") v.Settings = d2corecommon.LoadConfiguration() } func (v *Engine) LoadFile(fileName string) []byte { return v.assetManager.LoadFile(fileName) } // IsLoading returns true if the engine is currently in a loading state func (v Engine) IsLoading() bool { return v.loadingProgress < 1.0 } // LoadSprite loads a sprite from the game's data files func (v Engine) LoadSprite(fileName string, palette d2enum.PaletteType) d2render.Sprite { dc6, _ := d2dc6.LoadDC6(v.LoadFile(fileName), d2datadict.Palettes[palette]) sprite := d2render.CreateSpriteFromDC6(dc6) return sprite } // updateScene handles the scene maintenance for the engine func (v *Engine) updateScene() { if v.nextScene == nil { if v.thingsToLoad != nil { if v.loadingIndex < len(v.thingsToLoad) { v.thingsToLoad[v.loadingIndex]() v.loadingIndex++ if v.loadingIndex < len(v.thingsToLoad) { v.StepLoading() } else { v.FinishLoading() v.thingsToLoad = nil } return } } return } if v.CurrentScene != nil { v.CurrentScene.Unload() runtime.GC() } v.CurrentScene = v.nextScene v.nextScene = nil v.UIManager.Reset() v.thingsToLoad = v.CurrentScene.Load() v.loadingIndex = 0 v.SetLoadingStepSize(1.0 / float64(len(v.thingsToLoad))) v.ResetLoading() } // Update updates the internal state of the engine func (v *Engine) Update() { if ebiten.IsKeyPressed(ebiten.KeyAlt) && ebiten.IsKeyPressed(ebiten.KeyEnter) { if !v.fullscreenKey { ebiten.SetFullscreen(!ebiten.IsFullscreen()) } v.fullscreenKey = true } else { v.fullscreenKey = false } if inpututil.IsKeyJustPressed(ebiten.KeyF6) { v.showFPS = !v.showFPS } if inpututil.IsKeyJustPressed(ebiten.KeyF8) { ebiten.SetVsyncEnabled(!ebiten.IsVsyncEnabled()) } v.updateScene() if v.CurrentScene == nil { log.Fatal("no scene loaded") } if v.IsLoading() { return } currentTime := float64(time.Now().UnixNano()) / float64(time.Second) deltaTime := math.Min((currentTime - v.lastTime), 0.1) v.lastTime = currentTime v.CurrentScene.Update(deltaTime) v.UIManager.Update() } // Draw draws the game func (v Engine) Draw(screen *ebiten.Image) { if v.loadingProgress < 1.0 { v.LoadingSprite.Frame = int16(d2helper.Max(0, d2helper.Min(uint32(len(v.LoadingSprite.Frames)-1), uint32(float64(len(v.LoadingSprite.Frames)-1)*v.loadingProgress)))) v.LoadingSprite.Draw(screen) } else { if v.CurrentScene == nil { log.Fatal("no scene loaded") } v.CurrentScene.Render(screen) v.UIManager.Draw(screen) } if v.showFPS { ebitenutil.DebugPrintAt(screen, "vsync:"+strconv.FormatBool(ebiten.IsVsyncEnabled())+"\nFPS:"+strconv.Itoa(int(ebiten.CurrentFPS())), 5, 565) var m runtime.MemStats runtime.ReadMemStats(&m) ebitenutil.DebugPrintAt(screen, "Alloc "+strconv.FormatInt(int64(m.Alloc)/1024/1024, 10), 680, 0) ebitenutil.DebugPrintAt(screen, "Pause "+strconv.FormatInt(int64(m.PauseTotalNs/1024/1024), 10), 680, 10) ebitenutil.DebugPrintAt(screen, "HeapSys "+strconv.FormatInt(int64(m.HeapSys/1024/1024), 10), 680, 20) ebitenutil.DebugPrintAt(screen, "NumGC "+strconv.FormatInt(int64(m.NumGC), 10), 680, 30) cx, cy := ebiten.CursorPosition() ebitenutil.DebugPrintAt(screen, "Coords "+strconv.FormatInt(int64(cx), 10) + ","+strconv.FormatInt(int64(cy), 10), 680, 40) } } // SetNextScene tells the engine what scene to load on the next update cycle func (v *Engine) SetNextScene(nextScene d2coreinterface.Scene) { v.nextScene = nextScene } // SetLoadingStepSize sets the size of the loading step func (v *Engine) SetLoadingStepSize(size float64) { v.stepLoadingSize = size } // ResetLoading resets the loading progress func (v *Engine) ResetLoading() { v.loadingProgress = 0.0 } // StepLoading increments the loading progress func (v *Engine) StepLoading() { v.loadingProgress = math.Min(1.0, v.loadingProgress+v.stepLoadingSize) } // FinishLoading terminates the loading phase func (v *Engine) FinishLoading() { v.loadingProgress = 1.0 }