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mirror of https://github.com/OpenDiablo2/OpenDiablo2 synced 2024-11-02 09:17:19 -04:00
OpenDiablo2/d2core/engine.go

265 lines
8.2 KiB
Go

package d2core
import (
"log"
"math"
"path"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/OpenDiablo2/OpenDiablo2/d2common/d2resource"
"github.com/OpenDiablo2/OpenDiablo2/d2helper"
"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
"github.com/OpenDiablo2/OpenDiablo2/d2render"
"github.com/OpenDiablo2/OpenDiablo2/d2data"
"github.com/OpenDiablo2/OpenDiablo2/d2data/d2datadict"
"github.com/OpenDiablo2/OpenDiablo2/d2data/d2mpq"
"github.com/OpenDiablo2/OpenDiablo2/d2audio"
"github.com/OpenDiablo2/OpenDiablo2/d2common"
"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 *d2common.Configuration // Engine configuration settings from json file
Files map[string]string // Map that defines which files are in which MPQs
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 d2interface.Scene // The current scene being rendered
UIManager *d2ui.Manager // The UI manager
SoundManager *d2audio.Manager // The sound manager
nextScene d2interface.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
}
// CreateEngine creates and instance of the OpenDiablo2 engine
func CreateEngine() Engine {
result := Engine{
CurrentScene: nil,
nextScene: nil,
}
result.loadConfigurationFile()
d2resource.LanguageCode = result.Settings.Language
result.mapMpqFiles()
d2datadict.LoadPalettes(result.Files, &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.LoadUniqueItems(&result)
d2datadict.LoadMissiles(&result)
d2datadict.LoadSounds(&result)
d2data.LoadAnimationData(&result)
d2datadict.LoadMonStats(&result)
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)))
//result.SetNextScene(Scenes.CreateBlizzardIntro(result, result))
return result
}
func (v *Engine) loadConfigurationFile() {
log.Println("Loading configuration file")
v.Settings = d2common.LoadConfiguration()
}
func (v *Engine) mapMpqFiles() {
v.Files = make(map[string]string)
}
var mutex sync.Mutex
func (v *Engine) LoadFile(fileName string) []byte {
fileName = strings.ReplaceAll(fileName, "{LANG}", d2resource.LanguageCode)
fileName = strings.ToLower(fileName)
fileName = strings.ReplaceAll(fileName, `/`, "\\")
if fileName[0] == '\\' {
fileName = fileName[1:]
}
mutex.Lock()
defer mutex.Unlock()
// TODO: May want to cache some things if performance becomes an issue
cachedMpqFile, cacheExists := v.Files[fileName]
if cacheExists {
archive, _ := d2mpq.Load(cachedMpqFile)
result, _ := archive.ReadFile(fileName)
return result
}
for _, mpqFile := range v.Settings.MpqLoadOrder {
archive, _ := d2mpq.Load(path.Join(v.Settings.MpqPath, mpqFile))
if archive == nil {
log.Fatalf("Failed to load specified MPQ file: %s", mpqFile)
}
if !archive.FileExists(fileName) {
continue
}
result, _ := archive.ReadFile(fileName)
if len(result) == 0 {
continue
}
v.Files[fileName] = path.Join(v.Settings.MpqPath, mpqFile)
return result
}
log.Fatalf("Could not load %s from MPQs", fileName)
return []byte{}
}
// 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 {
data := v.LoadFile(fileName)
sprite := d2render.CreateSprite(data, d2datadict.Palettes[palette])
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 = uint8(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 == true {
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), 700, 0)
ebitenutil.DebugPrintAt(screen, "Pause "+strconv.FormatInt(int64(m.PauseTotalNs/1024/1024), 10), 700, 10)
ebitenutil.DebugPrintAt(screen, "HeapSys "+strconv.FormatInt(int64(m.HeapSys/1024/1024), 10), 700, 20)
ebitenutil.DebugPrintAt(screen, "NumGC "+strconv.FormatInt(int64(m.NumGC), 10), 700, 30)
}
}
// SetNextScene tells the engine what scene to load on the next update cycle
func (v *Engine) SetNextScene(nextScene d2interface.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
}