up3

server/block/model/trapdoor.go

@@ -0,0 +1,37 @@
+package model
+
+import (
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// Trapdoor is a model used for trapdoors. It has no solid faces and a bounding box that changes depending on
+// the direction of the trapdoor.
+type Trapdoor struct {
+	// Facing is the facing direction of the Trapdoor. In addition to the texture, it influences the direction in which
+	// the Trapdoor is opened.
+	Facing cube.Direction
+	// Open and Top specify if the Trapdoor is opened and if it's in the top or bottom part of a block respectively.
+	Open, Top bool
+}
+
+// BBox returns a physics.BBox that depends on the facing direction of the Trapdoor and whether it is open and in the
+// top part of the block.
+func (t Trapdoor) BBox(cube.Pos, world.BlockSource) []cube.BBox {
+	if t.Open {
+		return []cube.BBox{full.ExtendTowards(t.Facing.Face(), -0.8125)}
+	} else if t.Top {
+		return []cube.BBox{cube.Box(0, 0.8125, 0, 1, 1, 1)}
+	}
+	return []cube.BBox{cube.Box(0, 0, 0, 1, 0.1875, 1)}
+}
+
+// FaceSolid returns true if the face is completely filled with the trapdoor.
+func (t Trapdoor) FaceSolid(_ cube.Pos, face cube.Face, _ world.BlockSource) bool {
+	if t.Open {
+		return t.Facing.Face().Opposite() == face
+	} else if t.Top {
+		return face == cube.FaceUp
+	}
+	return face == cube.FaceDown
+}