89 lines
3.4 KiB
Swift
89 lines
3.4 KiB
Swift
/**
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* Copyright (c) 2019 Razeware LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
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* distribute, sublicense, create a derivative work, and/or sell copies of the
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* Software in any work that is designed, intended, or marketed for pedagogical or
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* instructional purposes related to programming, coding, application development,
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* or information technology. Permission for such use, copying, modification,
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* merger, publication, distribution, sublicensing, creation of derivative works,
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* or sale is expressly withheld.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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import MetalKit
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public typealias float2 = SIMD2<Float>
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public typealias float3 = SIMD3<Float>
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public typealias float4 = SIMD4<Float>
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public class Renderer: NSObject, MTKViewDelegate {
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public let device: MTLDevice!
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let commandQueue: MTLCommandQueue!
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override public init() {
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let initialized = Renderer.initializeMetal()
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device = initialized?.device
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commandQueue = initialized?.commandQueue
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super.init()
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}
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private static func initializeMetal() -> (
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device: MTLDevice, commandQueue: MTLCommandQueue)?
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{
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guard let device = MTLCreateSystemDefaultDevice(),
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let commandQueue = device.makeCommandQueue() else { return nil }
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return (device, commandQueue)
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}
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func makeRenderCommandEncoder(_ commandBuffer: MTLCommandBuffer, _ texture: MTLTexture) -> MTLRenderCommandEncoder {
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let descriptor = MTLRenderPassDescriptor()
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let color = MTLClearColor(red: 0.5, green: 0.5, blue: 0.5, alpha: 1)
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descriptor.colorAttachments[0].texture = texture
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descriptor.colorAttachments[0].clearColor = color
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descriptor.colorAttachments[0].loadAction = .clear
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guard let renderCommandEncoder = commandBuffer.makeRenderCommandEncoder(descriptor: descriptor) else {
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fatalError("Cannot create a render command encoder.")
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}
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return renderCommandEncoder
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}
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public func draw(in view: MTKView) {
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guard let commandBuffer = commandQueue.makeCommandBuffer(),
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let drawable = view.currentDrawable else {
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return
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}
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// first command encoder
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let renderEncoder = makeRenderCommandEncoder(commandBuffer, drawable.texture)
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renderEncoder.endEncoding()
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// second command encoder
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commandBuffer.present(drawable)
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commandBuffer.commit()
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}
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public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {}
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}
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