Create Terrain2 app, using Xcode's boilerplate

Terrain2/ShaderTypes.h

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+//
+//  ShaderTypes.h
+//  Terrain2
+//
+//  Created by Eryn Wells on 11/3/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+//
+//  Header containing types and enum constants shared between Metal shaders and Swift/ObjC source
+//
+#ifndef ShaderTypes_h
+#define ShaderTypes_h
+
+#ifdef __METAL_VERSION__
+#define NS_ENUM(_type, _name) enum _name : _type _name; enum _name : _type
+#define NSInteger metal::int32_t
+#else
+#import <Foundation/Foundation.h>
+#endif
+
+#include <simd/simd.h>
+
+typedef NS_ENUM(NSInteger, BufferIndex)
+{
+    BufferIndexMeshPositions = 0,
+    BufferIndexMeshGenerics  = 1,
+    BufferIndexUniforms      = 2
+};
+
+typedef NS_ENUM(NSInteger, VertexAttribute)
+{
+    VertexAttributePosition  = 0,
+    VertexAttributeTexcoord  = 1,
+};
+
+typedef NS_ENUM(NSInteger, TextureIndex)
+{
+    TextureIndexColor    = 0,
+};
+
+typedef struct
+{
+    matrix_float4x4 projectionMatrix;
+    matrix_float4x4 modelViewMatrix;
+} Uniforms;
+
+#endif /* ShaderTypes_h */
+