Initial wgpu abstraction

Source/Shader/ShaderStage.rs

@@ -0,0 +1,17 @@
+use serde::{Deserialize, Serialize};
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq, Serialize, Deserialize)]
+pub enum ShaderStage {
+    /// Handles the processing of individual vertices
+    Vertex = 0,
+
+    /// Process a fragment generated by the rasterization into a set of colors and a single depth value.
+    Fragment = 1,
+
+    /// Used entirely for computing arbitrary information
+    Compute = 2,
+
+    /// Multi-stage shader, used with wgsl sources.
+    Multiple = 3,
+}