More optimizations

internal/maps/map.go

@@ -3,6 +3,7 @@ package maps
 import (
 	"image/color"
 
+	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/atridad/LilGuy/internal/portal"
 	"github.com/atridad/LilGuy/internal/world"
 )
@@ -16,6 +17,8 @@ type Map struct {
 	World           *world.World
 	Portals         []*portal.Portal
 	BackgroundColor color.NRGBA
+
+	bakedImage *ebiten.Image
 }
 
 func NewMap(id string, number int, displayName string, width, height float64) *Map {
@@ -44,6 +47,38 @@ func (m *Map) GetPortalByID(id string) *portal.Portal {
 	return nil
 }
 
+// Renders the static world geometry to an offscreen image
+func (m *Map) Bake() {
+	if m.Width <= 0 || m.Height <= 0 {
+		return
+	}
+	m.bakedImage = ebiten.NewImage(int(m.Width), int(m.Height))
+	m.bakedImage.Fill(m.BackgroundColor)
+	m.World.Draw(m.bakedImage)
+}
+
+func (m *Map) Draw(screen *ebiten.Image) {
+	if m.bakedImage != nil {
+		screen.DrawImage(m.bakedImage, nil)
+	} else {
+		screen.Fill(m.BackgroundColor)
+		m.World.Draw(screen)
+	}
+
+	// Draw portals
+	for _, p := range m.Portals {
+		p.Draw(screen)
+	}
+}
+
+// Resets the map state
+func (m *Map) Reset() {
+	for _, p := range m.Portals {
+		p.Enabled = true
+		p.Visible = true
+	}
+}
+
 func CreateDefaultMaps(screenWidth, screenHeight float64) (*Map, *Map) {
 	plains := CreatePlains(screenWidth, screenHeight)
 	desert := CreateDesert(screenWidth, screenHeight)