62 lines
2.2 KiB
Swift
62 lines
2.2 KiB
Swift
//
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// MetalView.swift
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// chapter04
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//
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// Created by Marius on 1/26/16.
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// Copyright © 2016 Marius Horga. All rights reserved.
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//
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import MetalKit
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class MetalView: MTKView {
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var commandQueue: MTLCommandQueue?
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var rps: MTLRenderPipelineState?
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var vertexBuffer: MTLBuffer?
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struct Vertex {
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var position: vector_float4
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var color: vector_float4
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}
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required init(coder: NSCoder) {
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super.init(coder: coder)
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createBuffer()
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registerShaders()
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}
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func createBuffer() {
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device = MTLCreateSystemDefaultDevice()!
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commandQueue = device!.makeCommandQueue()
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let vertexData = [Vertex(position: [-0.5, -0.5, 0.0, 1.0], color: [1, 0, 0, 1]),
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Vertex(position: [ 0.5, -0.5, 0.0, 1.0], color: [0, 1, 0, 1]),
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Vertex(position: [ 0.0, 0.5, 0.0, 1.0], color: [0, 0, 1, 1])]
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vertexBuffer = device!.makeBuffer(bytes: vertexData, length: MemoryLayout<Vertex>.size * 3, options:[])
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}
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func registerShaders() {
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let library = device!.makeDefaultLibrary()!
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let vertex_func = library.makeFunction(name: "vertex_func")
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let frag_func = library.makeFunction(name: "fragment_func")
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let rpld = MTLRenderPipelineDescriptor()
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rpld.vertexFunction = vertex_func
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rpld.fragmentFunction = frag_func
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rpld.colorAttachments[0].pixelFormat = .bgra8Unorm
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rps = try! device!.makeRenderPipelineState(descriptor: rpld)
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}
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override func draw(_ dirtyRect: NSRect) {
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if let drawable = currentDrawable, let rpd = currentRenderPassDescriptor {
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rpd.colorAttachments[0].clearColor = MTLClearColorMake(0.5, 0.5, 0.5, 1.0)
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let commandBuffer = commandQueue!.makeCommandBuffer()
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let commandEncoder = commandBuffer?.makeRenderCommandEncoder(descriptor: rpd)
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commandEncoder?.setRenderPipelineState(rps!)
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commandEncoder?.setVertexBuffer(vertexBuffer, offset: 0, index: 0)
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commandEncoder?.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 3, instanceCount: 1)
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commandEncoder?.endEncoding()
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commandBuffer?.present(drawable)
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commandBuffer?.commit()
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}
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}
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}
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