Fix incorrect vertex layout indices

redhorizon-engine/source/nz/net/ultraq/redhorizon/engine/graphics/VertexBufferLayoutPart.groovy

@@ -1,12 +1,12 @@
-/* 
+/*
  * Copyright 2021, Emanuel Rabina (http://www.ultraq.net.nz/)
- * 
+ *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *     http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -22,14 +22,14 @@ import groovy.transform.TupleConstructor
 
 /**
  * A description of the data comprising a section of a vertex buffer layout.
- * 
+ *
  * @author Emanuel Rabina
  */
 @TupleConstructor
 enum VertexBufferLayoutPart {
 
-	COLOUR      ('colour',     0, Colour.FLOATS),
-	POSITION    ('position',   1, Vector2f.FLOATS),
+	POSITION    ('position',   0, Vector2f.FLOATS),
+	COLOUR      ('colour',     1, Colour.FLOATS),
 	TEXTURE_UVS ('textureUVs', 2, Vector2f.FLOATS)
 
 	final String name