Create Terrain2 app, using Xcode's boilerplate

Terrain2/Shaders.metal

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+//
+//  Shaders.metal
+//  Terrain2
+//
+//  Created by Eryn Wells on 11/3/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+// File for Metal kernel and shader functions
+
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+// Including header shared between this Metal shader code and Swift/C code executing Metal API commands
+#import "ShaderTypes.h"
+
+using namespace metal;
+
+typedef struct
+{
+    float3 position [[attribute(VertexAttributePosition)]];
+    float2 texCoord [[attribute(VertexAttributeTexcoord)]];
+} Vertex;
+
+typedef struct
+{
+    float4 position [[position]];
+    float2 texCoord;
+} ColorInOut;
+
+vertex ColorInOut vertexShader(Vertex in [[stage_in]],
+                               constant Uniforms & uniforms [[ buffer(BufferIndexUniforms) ]])
+{
+    ColorInOut out;
+
+    float4 position = float4(in.position, 1.0);
+    out.position = uniforms.projectionMatrix * uniforms.modelViewMatrix * position;
+    out.texCoord = in.texCoord;
+
+    return out;
+}
+
+fragment float4 fragmentShader(ColorInOut in [[stage_in]],
+                               constant Uniforms & uniforms [[ buffer(BufferIndexUniforms) ]],
+                               texture2d<half> colorMap     [[ texture(TextureIndexColor) ]])
+{
+    constexpr sampler colorSampler(mip_filter::linear,
+                                   mag_filter::linear,
+                                   min_filter::linear);
+
+    half4 colorSample   = colorMap.sample(colorSampler, in.texCoord.xy);
+
+    return float4(colorSample);
+}