up3

server/block/oxidizable.go

@@ -0,0 +1,80 @@
+package block
+
+import (
+	"math/rand/v2"
+
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// Oxidisable is a block that can naturally oxidise over time, such as copper.
+type Oxidisable interface {
+	world.Block
+	// CanOxidate returns whether the block can oxidate, i.e. if it's not waxed.
+	CanOxidate() bool
+	// OxidationLevel returns the currently level of oxidation of the block.
+	OxidationLevel() OxidationType
+	// WithOxidationLevel returns the oxidizable block with the oxidation level passed.
+	WithOxidationLevel(OxidationType) Oxidisable
+}
+
+// attemptOxidation attempts to oxidise the block at the position passed. The details for this logic is
+// described on the Minecraft Wiki: https://minecraft.wiki/w/Oxidation.
+func attemptOxidation(pos cube.Pos, tx *world.Tx, r *rand.Rand, o Oxidisable) {
+	level := o.OxidationLevel()
+	if level == OxidisedOxidation() || !o.CanOxidate() {
+		return
+	} else if r.Float64() > 64.0/1125.0 {
+		return
+	}
+
+	var all, higher int
+	for x := -4; x <= 4; x++ {
+		for y := -4; y <= 4; y++ {
+			for z := -4; z <= 4; z++ {
+				if x == 0 && y == 0 && z == 0 {
+					continue
+				}
+				nPos := pos.Add(cube.Pos{x, y, z})
+				dist := abs(nPos.X()-pos.X()) + abs(nPos.Y()-pos.Y()) + abs(nPos.Z()-pos.Z())
+				if dist > 4 {
+					continue
+				}
+
+				b, ok := tx.Block(nPos).(Oxidisable)
+				if !ok || !b.CanOxidate() {
+					continue
+				} else if b.OxidationLevel().Uint8() < level.Uint8() {
+					return
+				}
+				all++
+				if b.OxidationLevel().Uint8() > level.Uint8() {
+					higher++
+				}
+			}
+		}
+	}
+
+	chance := float64(higher+1) / float64(all+1)
+	if level == UnoxidisedOxidation() {
+		chance *= chance * 0.75
+	} else {
+		chance *= chance
+	}
+	if r.Float64() < chance {
+		level, _ = level.Increase()
+		tx.SetBlock(pos, o.WithOxidationLevel(level), nil)
+	}
+}
+
+// copperBlockName returns the name of a copper block with the given oxidation and waxed status.
+func copperBlockName(blockName string, oxidation OxidationType, waxed bool) string {
+	name := blockName
+	if oxidation != UnoxidisedOxidation() {
+		name = oxidation.String() + "_" + name
+	}
+	if waxed {
+		name = "waxed_" + name
+	}
+	return "minecraft:" + name
+}