59 lines
2.1 KiB
Swift
59 lines
2.1 KiB
Swift
//
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// MetalView.swift
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// chapter03
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//
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// Created by Marius on 1/12/16.
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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 vertexData: [Float]?
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var vertexBuffer: MTLBuffer?
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required init(coder: NSCoder) {
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super.init(coder: coder)
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render()
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}
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func render() {
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device = MTLCreateSystemDefaultDevice()!
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commandQueue = device!.newCommandQueue()
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vertexData = [-1.0, -1.0, 0.0, 1.0,
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1.0, -1.0, 0.0, 1.0,
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0.0, 1.0, 0.0, 1.0]
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let dataSize = vertexData!.count * sizeof(Float.self)
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vertexBuffer = device!.newBuffer(withBytes: vertexData!, length: dataSize, options: [])
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let library = device!.newDefaultLibrary()!
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let vertex_func = library.newFunction(withName: "vertex_func")
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let frag_func = library.newFunction(withName: "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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do {
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try rps = device!.newRenderPipelineState(with: rpld)
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} catch let error {
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self.print("\(error)")
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}
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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, 0.5, 0.5, 1.0)
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let commandBuffer = commandQueue!.commandBuffer()
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let commandEncoder = commandBuffer.renderCommandEncoder(with: rpd)
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commandEncoder.setRenderPipelineState(rps!)
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commandEncoder.setVertexBuffer(vertexBuffer, offset: 0, at: 0)
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commandEncoder.drawPrimitives(.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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