Initial pipeline abstraction

Source/Render/Pipeline/Face.rs

@@ -0,0 +1,12 @@
+use serde::{Deserialize, Serialize};
+
+/// Face of a vertex.
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq, Serialize, Deserialize)]
+pub enum Face {
+    /// Front face
+    Front = 0,
+
+    /// Back face
+    Back = 1,
+}