[Renderer] Rename OpenGLRenderer source directory to OpenGL

Renderer/OpenGL/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2015 Eryn Wells. All rights reserved.</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

Renderer/OpenGL/OpenGLRenderer.h

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+//
+//  OpenGLRenderer.h
+//  OpenGLRenderer
+//
+//  Created by Eryn Wells on 11/12/15.
+//  Copyright © 2015 Eryn Wells. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+//! Project version number for OpenGLRenderer.
+FOUNDATION_EXPORT double OpenGLRendererVersionNumber;
+
+//! Project version string for OpenGLRenderer.
+FOUNDATION_EXPORT const unsigned char OpenGLRendererVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <OpenGLRenderer/PublicHeader.h>
+
+

Renderer/OpenGL/OpenGLView.swift

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+//
+//  OpenGLView.swift
+//  OpenGLRenderer
+//
+//  Created by Eryn Wells on 11/12/15.
+//  Copyright © 2015 Eryn Wells. All rights reserved.
+//
+
+import Foundation
+import Cocoa
+import OpenGL
+import CoreVideo
+
+class OpenGLView: NSOpenGLView {
+    private var didSetupOpenGL = false
+    private var displayLink: CVDisplayLink? = nil
+
+    override func viewWillMoveToSuperview(newSuperview: NSView?) {
+        if newSuperview != nil {
+            setupOpenGL()
+            startRenderingLoop()
+        } else {
+            stopRenderingLoop()
+        }
+    }
+
+    private func setupOpenGL() {
+        if didSetupOpenGL {
+            return
+        }
+
+        defer { didSetupOpenGL = true }
+
+        let attrs = [NSOpenGLPFAAccelerated,
+                     NSOpenGLPFADoubleBuffer,
+                     NSOpenGLPFADepthSize, 24,
+                     NSOpenGLPFAOpenGLProfile,
+                     NSOpenGLProfileVersion4_1Core]
+
+        let format = NSOpenGLPixelFormat(attributes: UnsafePointer<UInt32>(attrs))
+        guard format != nil else {
+            // TODO: Throw an error?
+            return
+        }
+        
+        let context = NSOpenGLContext(format: format!, shareContext: nil)
+        guard context != nil else {
+            // TODO: Throw an error?
+            return
+        }
+
+        CGLEnable(context!.CGLContextObj, kCGLCECrashOnRemovedFunctions)
+
+        pixelFormat = format
+        openGLContext = context
+        wantsBestResolutionOpenGLSurface = true
+    }
+
+    private func startRenderingLoop() {
+        var success = kCVReturnSuccess
+
+        success = CVDisplayLinkCreateWithActiveCGDisplays(&displayLink)
+        guard success == kCVReturnSuccess && displayLink != nil else {
+            // TODO: Throw an error?
+            return
+        }
+
+        success = CVDisplayLinkSetOutputHandler(displayLink!) {
+            (displayLink: CVDisplayLink,
+             currentTime: UnsafePointer<CVTimeStamp>,
+             displayTime: UnsafePointer<CVTimeStamp>,
+             optionsIn: CVOptionFlags,
+             optionsOut: UnsafeMutablePointer<CVOptionFlags>) -> CVReturn in
+            var result = kCVReturnSuccess
+            autoreleasepool {
+                result = self._renderAtTime(currentTime.memory)
+            }
+            return result
+        }
+        guard success == kCVReturnSuccess else {
+            // TODO: Throw an error?
+            return
+        }
+
+        if let context = self.openGLContext?.CGLContextObj, format = self.pixelFormat?.CGLPixelFormatObj {
+            CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(displayLink!, context, format)
+        } else {
+            // TODO: Throw an error?
+            return
+        }
+
+        CVDisplayLinkStart(displayLink!)
+    }
+
+    private func stopRenderingLoop() {
+        guard displayLink != nil else { return }
+        CVDisplayLinkStop(displayLink!)
+        displayLink = nil
+    }
+
+    private func _renderAtTime(time: CVTimeStamp) -> CVReturn {
+        return kCVReturnSuccess
+    }
+}