Eager load used sprites

cmd/view-map/main.go

@@ -52,6 +52,11 @@ func main() {
 		log.Fatalf("Failed to load map %v: %v", *gameMap, err)
 	}
 
+	// Eager load sprites
+	if err := area.LoadSprites(); err != nil {
+		log.Fatal("Eager-loading sprites failed: %v", err)
+	}
+
 	state := state{
 		zoom:   1.0,
 		origin: image.Point{0, 3000}, // FIXME: haxxx
@@ -144,18 +149,21 @@ func (e *env) Draw(screen *ebiten.Image) error {
 		return false
 	})
 
+	counter := map[string]int{}
 	for _, pt := range toDraw {
 		for z := 0; z <= e.state.zIdx; z++ {
-			if err := e.renderCell(pt.X, pt.Y, z, screen); err != nil {
+			if err := e.renderCell(pt.X, pt.Y, z, screen, counter); err != nil {
 				return err
 			}
 		}
 	}
 
+	//log.Printf("%#+v", counter)
+
 	return nil
 }
 
-func (e *env) renderCell(x, y, z int, screen *ebiten.Image) error {
+func (e *env) renderCell(x, y, z int, screen *ebiten.Image, counter map[string]int) error {
 	sprites, err := e.area.SpritesForCell(x, y, z)
 	if err != nil {
 		return err
@@ -167,10 +175,6 @@ func (e *env) renderCell(x, y, z int, screen *ebiten.Image) error {
 	pix := cellToPix(image.Pt(x, y))
 	iso.Translate(float64(pix.X), float64(pix.Y))
 
-	if e.step%30 == 0 {
-		//	log.Printf("x=%v y=%v z=%v", pix.X-e.state.origin.X, pix.Y-e.state.origin.Y, z)
-	}
-
 	// Taking the Z index away *seems* to draw the object in the correct place.
 	// FIXME: There are some artifacts, investigate more
 	iso.Translate(0.0, -float64(z*48.0)) // offset for Z index
@@ -178,7 +182,13 @@ func (e *env) renderCell(x, y, z int, screen *ebiten.Image) error {
 	// TODO: iso.Scale(e.state.zoom, e.state.zoom) // apply current zoom factor
 
 	for _, spr := range sprites {
+		//		if _, ok := counter[spr.ID]; !ok {
+		//			counter[spr.ID] = 0
+		//		}
+		//		counter[spr.ID] = counter[spr.ID] + 1
+
 		iso.Translate(float64(spr.XOffset), float64(spr.YOffset))
+
 		if err := screen.DrawImage(spr.Image, &ebiten.DrawImageOptions{GeoM: iso}); err != nil {
 			return err
 		}

internal/assetstore/map.go

@@ -62,6 +62,21 @@ func (a *AssetStore) Map(name string) (*Map, error) {
 	return m, nil
 }
 
+func (m *Map) LoadSprites() error {
+	// Eager load the sprites we use
+	for x := m.Rect.Min.X; x <= m.Rect.Max.X; x++ {
+		for y := m.Rect.Min.Y; y <= m.Rect.Max.Y; y++ {
+			for z := 0; z < maps.MaxHeight; z++ {
+				if _, err := m.SpritesForCell(x, y, z); err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
 // SpritesForCell returns the sprites needed to correctly render this cell.
 // They should be rendered from first to last to get the correct ordering
 func (m *Map) SpritesForCell(x, y, z int) ([]*Sprite, error) {

internal/assetstore/object.go

@@ -1,6 +1,7 @@
 package assetstore
 
 import (
+	"fmt"
 	"log"
 
 	"github.com/hajimehoshi/ebiten"
@@ -18,6 +19,7 @@ type Object struct {
 type Sprite struct {
 	obj *Object
 
+	ID      string
 	XOffset int
 	YOffset int
 	Width   int
@@ -50,8 +52,8 @@ func (a *AssetStore) Object(name string) (*Object, error) {
 		sprites: make([]*Sprite, int(raw.NumSprites)),
 		raw:     raw,
 	}
-	a.objs[name] = obj
 
+	a.objs[name] = obj
 	return obj, nil
 }
 
@@ -75,6 +77,7 @@ func (o *Object) Sprite(idx int) (*Sprite, error) {
 	}
 
 	sprite := &Sprite{
+		ID:      fmt.Sprintf("%v:%v", o.raw.Name, idx),
 		obj:     o,
 		Width:   int(raw.Width),
 		Height:  int(raw.Width),