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[app,kit] Move Renderer and shaders to the Kit

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This commit is contained in:
Eryn Wells 2017-08-16 22:07:30 -07:00
parent ff853e2c06
commit c226d7e72e
3 changed files with 12 additions and 18 deletions
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121
Metaballs/Renderer.swift
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@ -1,121 +0,0 @@
//
// Renderer.swift
// Metaballs
//
// Created by Eryn Wells on 7/30/17.
// Copyright © 2017 Eryn Wells. All rights reserved.
//
import Foundation
import MetaballsKit
import MetalKit
enum RendererError: Error {
case MetalError(String)
}
protocol RendererDelegate {
var renderSize: Size { get set }
var field: Field { get }
var metalView: MTKView { get }
}
struct Point {
let x: Float
let y: Float
}
struct Vertex {
let position: Point
let textureCoordinate: Point
}
class Renderer: NSObject, MTKViewDelegate {
var delegate: RendererDelegate
private var device: MTLDevice
private var commandQueue: MTLCommandQueue
private var renderPipelineState: MTLRenderPipelineState
init(delegate: RendererDelegate) throws {
self.delegate = delegate
guard let device = MTLCreateSystemDefaultDevice() else {
throw RendererError.MetalError("Unable to create Metal system device")
}
let view = delegate.metalView
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()
super.init()
}
/// MARK: - MTKViewDelegate
func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
delegate.renderSize = Size(size: size)
}
func draw(in view: MTKView) {
let field = delegate.field
// Two triangles, plus texture coordinates.
let points: [Vertex] = [
Vertex(position: Point(x: 1, y: -1), textureCoordinate: Point(x: 1, y: 0)),
Vertex(position: Point(x: -1, y: -1), textureCoordinate: Point(x: 0, y: 0)),
Vertex(position: Point(x: -1, y: 1), textureCoordinate: Point(x: 0, y: 1)),
Vertex(position: Point(x: 1, y: -1), textureCoordinate: Point(x: 1, y: 0)),
Vertex(position: Point(x: -1, y: 1), textureCoordinate: Point(x: 0, y: 1)),
Vertex(position: Point(x: 1, y: 1), textureCoordinate: Point(x: 1, y: 1))
]
field.update()
let buffer = commandQueue.makeCommandBuffer()
buffer.label = "Render"
if let renderPass = view.currentRenderPassDescriptor {
let encoder = buffer.makeRenderCommandEncoder(descriptor: renderPass)
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.setRenderPipelineState(renderPipelineState)
encoder.setVertexBytes(points, length: points.count * MemoryLayout<Vertex>.stride, at: 0)
encoder.setFragmentBuffer(field.parametersBuffer, offset: 0, at: 0)
encoder.setFragmentBuffer(field.ballBuffer, offset: 0, at: 1)
encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 6)
encoder.endEncoding()
if let drawable = view.currentDrawable {
buffer.present(drawable)
}
}
buffer.commit()
}
}