[OpenGLRenderer] Rough outline of an NSOpenGLView subclass

Handles setting up the displayLink and starting it when added/removed from a
superview. It is up to subclasses (or delegates -- I haven't decided which yet)
to add the appropriate behavior.
This commit is contained in:
Eryn Wells 2015-11-13 08:31:41 -08:00
parent a1270d4ea5
commit 93da94e384
7 changed files with 619 additions and 0 deletions

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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>

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@ -0,0 +1,104 @@
//
// 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
}
}

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//
// OpenGLRendererTests.swift
// OpenGLRendererTests
//
// Created by Eryn Wells on 11/12/15.
// Copyright © 2015 Eryn Wells. All rights reserved.
//
import XCTest
@testable import OpenGLRenderer
class OpenGLRendererTests: XCTestCase {
override func setUp() {
super.setUp()
// Put setup code here. This method is called before the invocation of each test method in the class.
}
override func tearDown() {
// Put teardown code here. This method is called after the invocation of each test method in the class.
super.tearDown()
}
func testExample() {
// This is an example of a functional test case.
// Use XCTAssert and related functions to verify your tests produce the correct results.
}
func testPerformanceExample() {
// This is an example of a performance test case.
self.measureBlock {
// Put the code you want to measure the time of here.
}
}
}

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