Create a Renderer and copy over the Math library

Terrain.xcodeproj/project.pbxproj

@@ -11,6 +11,8 @@
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 		C0C15A9D218DDDC3007494E2 /* TerrainViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0C15A9B218DDDC3007494E2 /* TerrainViewController.swift */; };
+		C0C15AA0218DE0B2007494E2 /* Renderer.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0C15A9F218DE0B2007494E2 /* Renderer.swift */; };
+		C0C15AA2218DE21E007494E2 /* Math.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0C15AA1218DE21E007494E2 /* Math.swift */; };
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@@ -21,6 +23,8 @@
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 		C0C15A9B218DDDC3007494E2 /* TerrainViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TerrainViewController.swift; sourceTree = "<group>"; };
+		C0C15A9F218DE0B2007494E2 /* Renderer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Renderer.swift; sourceTree = "<group>"; };
+		C0C15AA1218DE21E007494E2 /* Math.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Math.swift; sourceTree = "<group>"; };
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@@ -55,6 +59,8 @@
 			children = (
 				C0C15A8D218DDD85007494E2 /* AppDelegate.swift */,
 				C0C15A9B218DDDC3007494E2 /* TerrainViewController.swift */,
+				C0C15A9F218DE0B2007494E2 /* Renderer.swift */,
+				C0C15AA1218DE21E007494E2 /* Math.swift */,
 				C0C15A8F218DDD87007494E2 /* Assets.xcassets */,
 				C0C15A91218DDD87007494E2 /* MainMenu.xib */,
 				C0C15A94218DDD87007494E2 /* Info.plist */,
@@ -134,7 +140,9 @@
 			buildActionMask = 2147483647;
 			files = (
 				C0C15A9D218DDDC3007494E2 /* TerrainViewController.swift in Sources */,
+				C0C15AA0218DE0B2007494E2 /* Renderer.swift in Sources */,
 				C0C15A8E218DDD85007494E2 /* AppDelegate.swift in Sources */,
+				C0C15AA2218DE21E007494E2 /* Math.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

Terrain/Math.swift

@@ -0,0 +1,122 @@
+//
+//  Math.swift
+//  Metaballs
+//
+//  Created by Eryn Wells on 9/22/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+import Cocoa
+import Foundation
+import simd
+
+public typealias Float2 = packed_float2
+public typealias Float3 = float3
+public typealias Float4 = float4
+public typealias Matrix2x2 = float2x2
+public typealias Matrix3x3 = float3x3
+public typealias Matrix4x4 = float4x4
+
+extension Float2 {
+    var CGPoint: CGPoint {
+        return CoreGraphics.CGPoint(x: CGFloat(x), y: CGFloat(y))
+    }
+}
+
+extension Float2: CustomStringConvertible {
+    public var description: String {
+        return "(\(x), \(y))"
+    }
+}
+
+extension Float3 {
+    func dot(other: Float3) -> Float3 {
+        return Float3(x * other.x, y * other.y, z * other.z)
+    }
+}
+
+extension Float4 {
+    public init(r: Float, g: Float, b: Float, a: Float) {
+        self.init(r, g, b, a)
+    }
+
+    public init(color: NSColor) {
+        if let convertedColor = color.usingColorSpace(NSColorSpace.deviceRGB) {
+            self.init(Float(convertedColor.redComponent), Float(convertedColor.greenComponent), Float(convertedColor.blueComponent), Float(convertedColor.alphaComponent))
+        } else {
+            self.init()
+        }
+    }
+}
+
+extension Matrix3x3 {
+    static func rotation(angle theta: Float) -> Matrix3x3 {
+        return self.init(rows: [
+            Float3(cos(theta), -sin(theta), 0.0),
+            Float3(sin(theta),  cos(theta), 0.0),
+            Float3(0, 0, 1),
+        ])
+    }
+
+    static func translation(dx: Float, dy: Float) -> Matrix3x3 {
+        var mat = self.init(1.0)
+        mat.columns.2.x = dx
+        mat.columns.2.y = dy
+        return mat
+    }
+
+    static func scale(x: Float, y: Float) -> Matrix3x3 {
+        var mat = self.init(1.0)
+        mat.columns.0.x = x
+        mat.columns.1.y = y
+        return mat
+    }
+}
+
+extension Matrix3x3 {
+    static func *(left: Matrix3x3, right: Matrix3x3) -> Matrix3x3 {
+        return matrix_multiply(left, right)
+    }
+}
+
+extension Matrix4x4 {
+    /// Create a 4x4 orthographic projection matrix with the provided 6-tuple.
+    /// @see https://en.wikipedia.org/wiki/Orthographic_projection
+    static func orthographicProjection(top: Float32, left: Float32, bottom: Float32, right: Float32, near: Float32, far: Float32) -> Matrix4x4 {
+        let rows = [
+            Float4(2.0 / (right - left), 0.0, 0.0, -(right + left) / (right - left)),
+            Float4(0.0, 2.0 / (top - bottom), 0.0, -(top + bottom) / (top - bottom)),
+            Float4(0.0, 0.0, -2.0 / (far - near), -(far + near) / (far - near)),
+            Float4(0.0, 0.0, 0.0, 1.0)
+        ]
+        return Matrix4x4(rows: rows)
+    }
+
+    static func translation(dx: Float, dy: Float, dz: Float) -> Matrix4x4 {
+        var mat = self.init(1.0)
+        mat.columns.3.x = dx
+        mat.columns.3.y = dy
+        mat.columns.3.z = dz
+        return mat
+    }
+
+    static func scale(x: Float, y: Float, z: Float) -> Matrix4x4 {
+        var mat = self.init(1.0)
+        mat.columns.0.x = x
+        mat.columns.1.y = y
+        mat.columns.2.z = z
+        return mat
+    }
+}
+
+extension Matrix4x4 {
+    static func *(left: Matrix4x4, right: Matrix4x4) -> Matrix4x4 {
+        return matrix_multiply(left, right)
+    }
+}
+
+extension CGSize {
+    init(size: Size) {
+        self.init(width: CGFloat(size.x), height: CGFloat(size.y))
+    }
+}

Terrain/Renderer.swift

@@ -0,0 +1,23 @@
+//
+//  Renderer.swift
+//  Terrain
+//
+//  Created by Eryn Wells on 11/3/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+import Cocoa
+import Metal
+import MetalKit
+
+class Renderer: NSObject, MTKViewDelegate {
+
+    func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
+        print("Size of \(view.debugDescription) will change to \(size)")
+    }
+
+    func draw(in view: MTKView) {
+        // TODO.
+    }
+
+}

Terrain/TerrainViewController.swift

@@ -11,6 +11,8 @@ import MetalKit
 
 class TerrainViewController: NSViewController {
 
+    let renderer = Renderer()
+
     private var metalView: MTKView! {
         return view as? MTKView
     }
@@ -23,6 +25,7 @@ class TerrainViewController: NSViewController {
         v.translatesAutoresizingMaskIntoConstraints = false
         v.widthAnchor.constraint(greaterThanOrEqualToConstant: 640).isActive = true
         v.heightAnchor.constraint(greaterThanOrEqualToConstant: 480).isActive = true
+        v.delegate = renderer
         view = v
     }