Render colored quads

wgpu/src/transformation.rs

@@ -0,0 +1,30 @@
+#[derive(Debug, Clone, Copy)]
+pub struct Transformation([f32; 16]);
+
+impl Transformation {
+    #[rustfmt::skip]
+    pub fn identity() -> Self {
+        Transformation([
+            1.0, 0.0, 0.0, 0.0,
+            0.0, 1.0, 0.0, 0.0,
+            0.0, 0.0, 1.0, 0.0,
+            0.0, 0.0, 0.0, 1.0,
+        ])
+    }
+
+    #[rustfmt::skip]
+    pub fn orthographic(width: u16, height: u16) -> Self {
+        Transformation([
+            2.0 / width as f32, 0.0, 0.0, 0.0,
+            0.0, 2.0 / height as f32, 0.0, 0.0,
+            0.0, 0.0, 1.0, 0.0,
+            -1.0, -1.0, 0.0, 1.0,
+        ])
+    }
+}
+
+impl From<Transformation> for [f32; 16] {
+    fn from(transformation: Transformation) -> [f32; 16] {
+        transformation.0
+    }
+}