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[kit] Shuffle things around so delegate doesn't have to be given in init()

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Classes that use the Renderer might not be ready to assign themselves as delegate when the Renderer is initialized
This commit is contained in:
Eryn Wells 2017-08-18 09:03:01 -07:00
parent 43caa7d844
commit 6b663f92e8
1 changed files with 52 additions and 36 deletions
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88
MetaballsKit/Renderer.swift
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@ -25,59 +25,75 @@ struct Vertex {
} }
public class Renderer: NSObject, MTKViewDelegate { public class Renderer: NSObject, MTKViewDelegate {
var delegate: RendererDelegate public var delegate: RendererDelegate? = nil {
didSet {
guard let delegate = delegate else {
return
}
let view = delegate.metalView
view.device = device
do {
let library = try device.makeDefaultLibrary(bundle: Bundle.main)
let vertexShader = library.makeFunction(name: "passthroughVertexShader")
let fragmentShader = library.makeFunction(name: "sampleToColorShader")
let pipelineStateDescriptor = MTLRenderPipelineDescriptor()
pipelineStateDescriptor.label = "Render Pipeline"
pipelineStateDescriptor.vertexFunction = vertexShader
pipelineStateDescriptor.fragmentFunction = fragmentShader
if let renderAttachment = pipelineStateDescriptor.colorAttachments[0] {
renderAttachment.pixelFormat = view.colorPixelFormat
// Pulled all this from SO. I don't know what all this does...
// https://stackoverflow.com/q/43727335/1174185
renderAttachment.isBlendingEnabled = true
renderAttachment.alphaBlendOperation = .add
renderAttachment.rgbBlendOperation = .add
renderAttachment.sourceRGBBlendFactor = .sourceAlpha
renderAttachment.sourceAlphaBlendFactor = .sourceAlpha
renderAttachment.destinationRGBBlendFactor = .oneMinusSourceAlpha
renderAttachment.destinationAlphaBlendFactor = .oneMinusSourceAlpha
}
renderPipelineState = try device.makeRenderPipelineState(descriptor: pipelineStateDescriptor)
try delegate.field.setupMetal(withDevice: device)
} catch let e {
fatalError("\(e)")
}
}
}
private var device: MTLDevice private var device: MTLDevice
private var commandQueue: MTLCommandQueue private var commandQueue: MTLCommandQueue
private var renderPipelineState: MTLRenderPipelineState private var renderPipelineState: MTLRenderPipelineState? = nil
public init(delegate: RendererDelegate) throws {
self.delegate = delegate
override public init() {
guard let device = MTLCreateSystemDefaultDevice() else { guard let device = MTLCreateSystemDefaultDevice() else {
throw RendererError.MetalError("Unable to create Metal system device") fatalError("Unable to create Metal system device")
} }
let view = delegate.metalView
self.device = device self.device = device
view.device = device
try delegate.field.setupMetal(withDevice: device)
let library = try device.makeDefaultLibrary(bundle: Bundle.main)
let vertexShader = library.makeFunction(name: "passthroughVertexShader")
let fragmentShader = library.makeFunction(name: "sampleToColorShader")
let pipelineStateDescriptor = MTLRenderPipelineDescriptor()
pipelineStateDescriptor.label = "Render Pipeline"
pipelineStateDescriptor.vertexFunction = vertexShader
pipelineStateDescriptor.fragmentFunction = fragmentShader
if let renderAttachment = pipelineStateDescriptor.colorAttachments[0] {
renderAttachment.pixelFormat = view.colorPixelFormat
// Pulled all this from SO. I don't know what all this does...
// https://stackoverflow.com/q/43727335/1174185
renderAttachment.isBlendingEnabled = true
renderAttachment.alphaBlendOperation = .add
renderAttachment.rgbBlendOperation = .add
renderAttachment.sourceRGBBlendFactor = .sourceAlpha
renderAttachment.sourceAlphaBlendFactor = .sourceAlpha
renderAttachment.destinationRGBBlendFactor = .oneMinusSourceAlpha
renderAttachment.destinationAlphaBlendFactor = .oneMinusSourceAlpha
}
renderPipelineState = try device.makeRenderPipelineState(descriptor: pipelineStateDescriptor)
commandQueue = device.makeCommandQueue() commandQueue = device.makeCommandQueue()
super.init() super.init()
} }
public convenience init(delegate: RendererDelegate) throws {
self.init()
self.delegate = delegate
}
/// MARK: - MTKViewDelegate /// MARK: - MTKViewDelegate
public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) { public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
delegate.renderSize = Size(size: size) delegate?.renderSize = Size(size: size)
} }
public func draw(in view: MTKView) { public func draw(in view: MTKView) {
let field = delegate.field guard let field = delegate?.field else {
return
}
// Two triangles, plus texture coordinates. // Two triangles, plus texture coordinates.
let points: [Vertex] = [ let points: [Vertex] = [
@ -95,7 +111,7 @@ public class Renderer: NSObject, MTKViewDelegate {
let buffer = commandQueue.makeCommandBuffer() let buffer = commandQueue.makeCommandBuffer()
buffer.label = "Render" buffer.label = "Render"
if let renderPass = view.currentRenderPassDescriptor { if let renderPass = view.currentRenderPassDescriptor, let renderPipelineState = renderPipelineState {
let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass) let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass)
encoder.label = "Render Pass" encoder.label = "Render Pass"
encoder.setViewport(MTLViewport(originX: 0.0, originY: 0.0, width: Double(view.drawableSize.width), height: Double(view.drawableSize.height), znear: -1.0, zfar: 1.0)) encoder.setViewport(MTLViewport(originX: 0.0, originY: 0.0, width: Double(view.drawableSize.width), height: Double(view.drawableSize.height), znear: -1.0, zfar: 1.0))