57 lines
2.1 KiB
Swift
Executable File
57 lines
2.1 KiB
Swift
Executable File
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import MetalKit
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public class MetalView: NSObject, MTKViewDelegate {
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public var device: MTLDevice! = nil
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var queue: MTLCommandQueue! = nil
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var cps: MTLComputePipelineState! = nil
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var timerBuffer: MTLBuffer! = nil
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var timer: Float = 0
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override public init() {
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super.init()
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device = MTLCreateSystemDefaultDevice()
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queue = device.makeCommandQueue()
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registerShaders()
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}
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func registerShaders() {
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guard let path = Bundle.main.path(forResource: "Shaders", ofType: "metal") else { return }
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do {
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let input = try String(contentsOfFile: path, encoding: String.Encoding.utf8)
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let library = try device.makeLibrary(source: input, options: nil)
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guard let kernel = library.makeFunction(name: "compute") else { return }
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cps = try device.makeComputePipelineState(function: kernel)
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} catch let e {
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Swift.print("\(e)")
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}
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timerBuffer = device.makeBuffer(length: MemoryLayout<Float>.size, options: [])
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}
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func update() {
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timer += 0.01
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let bufferPointer = timerBuffer.contents()
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memcpy(bufferPointer, &timer, MemoryLayout<Float>.size)
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}
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public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {}
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public func draw(in view: MTKView) {
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if let drawable = view.currentDrawable,
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let commandBuffer = queue.makeCommandBuffer(),
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let commandEncoder = commandBuffer.makeComputeCommandEncoder() {
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commandEncoder.setComputePipelineState(cps)
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commandEncoder.setTexture(drawable.texture, index: 0)
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commandEncoder.setBuffer(timerBuffer, offset: 0, index: 0)
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update()
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let threadGroupCount = MTLSizeMake(8, 8, 1)
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let threadGroups = MTLSizeMake(drawable.texture.width / threadGroupCount.width, drawable.texture.height / threadGroupCount.height, 1)
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commandEncoder.dispatchThreadgroups(threadGroups, threadsPerThreadgroup: threadGroupCount)
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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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