feat: hit on primitives

client/world/renderer_draw.go

@@ -2,8 +2,6 @@ package world
 
 import (
 	"sort"
-
-	"github.com/google/uuid"
 )
 
 // drawKind is used only for stable tie-breaking when priorities are equal.
@@ -18,7 +16,7 @@ const (
 type drawItem struct {
 	kind     drawKind
 	priority int
-	id       uuid.UUID
+	id       PrimitiveID
 	styleID  StyleID
 
 	// Exactly one of these is set.
@@ -122,7 +120,7 @@ func (w *World) drawPlanSinglePass(drawer PrimitiveDrawer, plan RenderPlan, allo
 			if a.kind != b.kind {
 				return a.kind < b.kind
 			}
-			return uuidLess(a.id, b.id)
+			return a.id < b.id
 		})
 
 		drawer.Save()
@@ -149,17 +147,3 @@ func (w *World) drawPlanSinglePass(drawer PrimitiveDrawer, plan RenderPlan, allo
 		drawer.Restore()
 	}
 }
-
-func uuidLess(a, b uuid.UUID) bool {
-	aa := a[:]
-	bb := b[:]
-	for i := 0; i < len(aa); i++ {
-		if aa[i] < bb[i] {
-			return true
-		}
-		if aa[i] > bb[i] {
-			return false
-		}
-	}
-	return false
-}