world: replay datapack features across regions

internal/world/disks_test.go

@@ -0,0 +1,91 @@
+package world
+
+import (
+	"testing"
+
+	"regionio/internal/worldgen"
+)
+
+func TestDiskStateProviderRules(t *testing.T) {
+	set, err := worldgen.LoadFeatureSet()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	makeRegion := func(block uint16) *decorationRegion {
+		chunk := NewChunk(0, 0, BiomePlains)
+		chunk.SetBlock(8, 0, 8, block)
+		region, err := newDecorationRegion([]*Chunk{chunk})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if err := region.setSource(0, 0); err != nil {
+			t.Fatal(err)
+		}
+		return region
+	}
+
+	dirt, ok := nameToStateID("minecraft:dirt", nil)
+	if !ok {
+		t.Fatal("dirt state missing")
+	}
+
+	sandConfig, err := set.Disk("minecraft:disk_sand")
+	if err != nil {
+		t.Fatal(err)
+	}
+	sandConfig.RadiusMin, sandConfig.RadiusMax, sandConfig.HalfHeight = 0, 0, 0
+	region := makeRegion(dirt)
+	if err := region.placeDisk(set, worldgen.NewWorldgenRandom(1), worldgen.FeaturePosition{X: 8, Y: 0, Z: 8}, sandConfig); err != nil {
+		t.Fatal(err)
+	}
+	sandstone, ok := nameToStateID("minecraft:sandstone", nil)
+	if !ok || region.getBlock(8, 0, 8) != sandstone {
+		t.Fatalf("sand rule state = %d, want sandstone %d", region.getBlock(8, 0, 8), sandstone)
+	}
+
+	grassConfig, err := set.Disk("minecraft:disk_grass")
+	if err != nil {
+		t.Fatal(err)
+	}
+	grassConfig.RadiusMin, grassConfig.RadiusMax, grassConfig.HalfHeight = 0, 0, 0
+	region = makeRegion(dirt)
+	if err := region.placeDisk(set, worldgen.NewWorldgenRandom(1), worldgen.FeaturePosition{X: 8, Y: 0, Z: 8}, grassConfig); err != nil {
+		t.Fatal(err)
+	}
+	grass, ok := nameToStateID("minecraft:grass_block", map[string]string{"snowy": "false"})
+	if !ok || region.getBlock(8, 0, 8) != grass {
+		t.Fatalf("grass rule state = %d, want grass %d", region.getBlock(8, 0, 8), grass)
+	}
+}
+
+func TestDiskStateProviderFallback(t *testing.T) {
+	set, err := worldgen.LoadFeatureSet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	config, err := set.Disk("minecraft:disk_grass")
+	if err != nil {
+		t.Fatal(err)
+	}
+	config.RadiusMin, config.RadiusMax, config.HalfHeight = 0, 0, 0
+
+	dirt, _ := nameToStateID("minecraft:dirt", nil)
+	stone, _ := nameToStateID("minecraft:stone", nil)
+	chunk := NewChunk(0, 0, BiomePlains)
+	chunk.SetBlock(8, 0, 8, dirt)
+	chunk.SetBlock(8, 1, 8, stone)
+	region, err := newDecorationRegion([]*Chunk{chunk})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := region.setSource(0, 0); err != nil {
+		t.Fatal(err)
+	}
+	if err := region.placeDisk(set, worldgen.NewWorldgenRandom(1), worldgen.FeaturePosition{X: 8, Y: 0, Z: 8}, config); err != nil {
+		t.Fatal(err)
+	}
+	if got := region.getBlock(8, 0, 8); got != dirt {
+		t.Fatalf("fallback state = %d, want dirt %d", got, dirt)
+	}
+}