Initial pipeline abstraction

Source/Render/Pipeline/PrimitiveTopology.rs

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+use serde::{Deserialize, Serialize};
+
+/// Primitive type the input mesh is composed of.
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq, Serialize, Deserialize)]
+pub enum PrimitiveTopology {
+    /// Vertex data is a list of points. Each vertex is a new point.
+    PointList = 0,
+
+    /// Vertex data is a list of lines. Each pair of vertices composes a new line.
+    ///
+    /// Vertices `0 1 2 3` create two lines `0 1` and `2 3`
+    LineList = 1,
+
+    /// Vertex data is a strip of lines. Each set of two adjacent vertices form a line.
+    ///
+    /// Vertices `0 1 2 3` create three lines `0 1`, `1 2`, and `2 3`.
+    LineStrip = 2,
+
+    /// Vertex data is a list of triangles. Each set of 3 vertices composes a new triangle.
+    ///
+    /// Vertices `0 1 2 3 4 5` create two triangles `0 1 2` and `3 4 5`
+    TriangleList = 3,
+
+    /// Vertex data is a triangle strip. Each set of three adjacent vertices form a triangle.
+    ///
+    /// Vertices `0 1 2 3 4 5` creates four triangles `0 1 2`, `2 1 3`, `2 3 4`, and `4 3 5`
+    TriangleStrip = 4,
+}
+
+impl Default for PrimitiveTopology {
+    fn default() -> Self {
+        PrimitiveTopology::TriangleList
+    }
+}