added welcome scene with text rendering using etxt

assets/loader-fonts.go

@@ -0,0 +1,59 @@
+package assets
+
+import (
+	"log"
+
+	"github.com/tinne26/etxt"
+)
+
+var FontRenderer = LoadFonts("fonts")
+
+const (
+	GameFont string = "x12y20pxScanLine"
+	FontSize int    = 16
+)
+
+type Texter struct {
+	Renderer *etxt.Renderer
+}
+
+func LoadFonts(dir string) *Texter {
+	fontlib := etxt.NewFontLibrary()
+	_, _, err := fontlib.ParseEmbedDirFonts(dir, assetfs)
+	if err != nil {
+		log.Fatalf("Error while loading fonts: %s", err.Error())
+	}
+
+	if !fontlib.HasFont(GameFont) {
+		log.Fatal("missing font: " + GameFont)
+	}
+
+	err = fontlib.EachFont(checkMissingRunes)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	renderer := etxt.NewStdRenderer()
+
+	glyphsCache := etxt.NewDefaultCache(10 * 1024 * 1024) // 10MB
+	renderer.SetCacheHandler(glyphsCache.NewHandler())
+	renderer.SetFont(fontlib.GetFont(GameFont))
+
+	return &Texter{renderer}
+}
+
+// helper function used with FontLibrary.EachFont to make sure
+// all loaded fonts contain the characters or alphabet we want
+func checkMissingRunes(name string, font *etxt.Font) error {
+	const letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	const symbols = "0123456789 .,;:!?-()[]{}_&#@"
+
+	missing, err := etxt.GetMissingRunes(font, letters+symbols)
+	if err != nil {
+		return err
+	}
+	if len(missing) > 0 {
+		log.Fatalf("Font '%s' missing runes: %s", name, string(missing))
+	}
+	return nil
+}

assets/loader-sprites.go

@@ -16,7 +16,7 @@ import (
 // Maps image name to image data
 type AssetRegistry map[string]*ebiten.Image
 
-//go:embed levels/*.lvl sprites/*.png
+//go:embed levels/*.lvl sprites/*.png fonts/*.ttf
 var assetfs embed.FS
 
 var Assets = LoadImages("sprites")