up3

server/item/bone_meal.go

@@ -0,0 +1,52 @@
+package item
+
+import (
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/df-mc/dragonfly/server/world/particle"
+	"github.com/go-gl/mathgl/mgl64"
+)
+
+// BoneMealResult represents the outcome of a bone meal interaction with a block,
+// determining the intensity of the particle effect displayed.
+type BoneMealResult int
+
+const (
+	// BoneMealResultNone indicates that the bone meal had no effect on the block.
+	BoneMealResultNone BoneMealResult = iota
+	// BoneMealResultSmall indicates a minor growth effect, produces a small particle burst.
+	BoneMealResultSmall
+	// BoneMealResultArea indicates a significant growth effect over an area, produces a large particle burst.
+	BoneMealResultArea
+)
+
+// BoneMeal is an item used to force growth in plants & crops.
+type BoneMeal struct{}
+
+// BoneMealAffected represents a block that is affected when bone meal is used on it.
+type BoneMealAffected interface {
+	// BoneMeal attempts to affect the block using a bone meal item.
+	BoneMeal(pos cube.Pos, tx *world.Tx) BoneMealResult
+}
+
+// UseOnBlock ...
+func (b BoneMeal) UseOnBlock(pos cube.Pos, _ cube.Face, _ mgl64.Vec3, tx *world.Tx, _ User, ctx *UseContext) bool {
+	if bm, ok := tx.Block(pos).(BoneMealAffected); ok {
+		result := bm.BoneMeal(pos, tx)
+		if result == BoneMealResultNone {
+			return false
+		}
+
+		ctx.SubtractFromCount(1)
+		tx.AddParticle(pos.Vec3(), particle.BoneMeal{
+			Area: result == BoneMealResultArea,
+		})
+		return true
+	}
+	return false
+}
+
+// EncodeItem ...
+func (b BoneMeal) EncodeItem() (name string, meta int16) {
+	return "minecraft:bone_meal", 0
+}