MediumDDDview.swift

import DDDKit
import GLMatrix
import GLKit
import AVFoundation

class DDD360VideoViewController: DDDViewController {
	fileprivate var videoNode: DDDNode!
	// DDDViewController handles a few things, including when to render the scene.
	// It already has a DDDScene object built in
	override func viewDidLoad() {
		super.viewDidLoad()
		let url = URL(string: "https://s3.amazonaws.com/mettavr/adhoc-uploads/k2LytGGex5.qt")!
		let player = AVPlayer(url: url)
		player.play()

		do {
			videoNode = DDDNode()
			videoNode.geometry = DDDGeometry.Sphere(radius: 20.0, orientation: .inward)
			scene?.add(node: videoNode)
			// I quite like putting the sphere forward so that it’s not too zoomed in:
			videoNode.position = Vec3(v: (0, 0, -30))

			let fragment = try DDDFragmentShader(fromResource: "fragmentShader", withExtention: "txt")
			// let program = try DDDShaderProgram(fragment: fragment)
			let program = try DDDShaderProgram(fragment: fragment, shaderModifiers: [
				.fragment: "gl_FragColor = vec4(vec3(gl_FragColor.x + gl_FragColor.y + gl_FragColor.z) / 3.0, 1.0);",
				])
			videoNode.material.shaderProgram = program

			let videoTexture = DDDVideoTexture(player: player)
			videoNode.material.set(property: videoTexture, for: "SamplerY", and: "SamplerUV")
			// Note that SamplerY and SampleUV match the variables names in the shader code
			setupGestureRecognizer()
		} catch {
			print(error)
		}
	}

	private func setupGestureRecognizer() {
		let panGesture = UIPanGestureRecognizer(
			target: self,
			action: #selector(didPan(sender:))
		)
		panGesture.maximumNumberOfTouches = 1
		view.addGestureRecognizer(panGesture)
	}

	private var hAngle: CGFloat = 0.0
	private var vAngle: CGFloat = 0.0
	@objc private func didPan(sender: UIPanGestureRecognizer) {
		guard let view = sender.view else { return }
		let vector = sender.translation(in: view)
		hAngle += -CGFloat(vector.x / view.frame.width / 5)
		vAngle += CGFloat(vector.y / view.frame.height / 10)
		let q = GLKQuaternionInvert(GLKQuaternion(right: hAngle, top: vAngle)).q
		videoNode.rotation = Quat(x: q.0, y: q.1, z: q.2, w: q.3)
	}
}