up3

server/block/model/slab.go

@@ -0,0 +1,37 @@
+package model
+
+import (
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// Slab is the model of a slab-like block, which is either a half block or a full block, depending on if the
+// slab is double.
+type Slab struct {
+	// Double and Top specify if the Slab is a double slab and if it's in the top slot respectively. If Double is true,
+	// the BBox returned is always a full block.
+	Double, Top bool
+}
+
+// BBox returns either a physics.BBox spanning a full block or a half block in the top/bottom part of the block,
+// depending on the Double and Top fields.
+func (s Slab) BBox(cube.Pos, world.BlockSource) []cube.BBox {
+	if s.Double {
+		return []cube.BBox{full}
+	}
+	if s.Top {
+		return []cube.BBox{cube.Box(0, 0.5, 0, 1, 1, 1)}
+	}
+	return []cube.BBox{cube.Box(0, 0, 0, 1, 0.5, 1)}
+}
+
+// FaceSolid returns true if the Slab is double, or if the face is cube.FaceUp when the Top field is true, or if the
+// face is cube.FaceDown when the Top field is false.
+func (s Slab) FaceSolid(_ cube.Pos, face cube.Face, _ world.BlockSource) bool {
+	if s.Double {
+		return true
+	} else if s.Top {
+		return face == cube.FaceUp
+	}
+	return face == cube.FaceDown
+}