【发布时间】：2019-03-17 07:17:47
【问题描述】：
所以在您项目的main.swift 文件中，您可以像这样创建一个窗口（然后从那里开始）：
let nsapp = NSApplication.shared
let window = NSWindow(
contentRect: NSMakeRect(0, 0, 200, 200),
styleMask: .fullSizeContentView,
backing: NSWindow.BackingStoreType.buffered,
defer: false
)
window.cascadeTopLeft(from:NSMakePoint(20,20))
nsapp.run()
我想知道如何用金属三角形做同样的事情。我一直在查看github.com/topics/metalkit，但到目前为止我发现的最接近的东西不在gist 中。
import Cocoa
import MetalKit
@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, MTKViewDelegate {
weak var window: NSWindow!
weak var metalView: MTKView!
let device = MTLCreateSystemDefaultDevice()!
var commandQueue: MTLCommandQueue!
var pipelineState: MTLRenderPipelineState!
func applicationDidFinishLaunching(_ aNotification: Notification) {
metalView = MTKView(frame: NSRect(origin: CGPoint.zero, size: window.frame.size), device: device)
metalView.delegate = self
window.contentView = metalView
commandQueue = device.makeCommandQueue()
let shaders = """
#include <metal_stdlib>
using namespace metal;
struct VertexIn {
packed_float3 position;
packed_float3 color;
};
struct VertexOut {
float4 position [[position]];
float4 color;
};
vertex VertexOut vertex_main(device const VertexIn *vertices [[buffer(0)]],
uint vertexId [[vertex_id]]) {
VertexOut out;
out.position = float4(vertices[vertexId].position, 1);
out.color = float4(vertices[vertexId].color, 1);
return out;
}
fragment float4 fragment_main(VertexOut in [[stage_in]]) {
return in.color;
}
"""
do {
let library = try device.makeLibrary(source: shaders, options: nil)
let pipelineDescriptor = MTLRenderPipelineDescriptor()
pipelineDescriptor.colorAttachments[0].pixelFormat = metalView.colorPixelFormat
pipelineDescriptor.vertexFunction = library.makeFunction(name: "vertex_main")
pipelineDescriptor.fragmentFunction = library.makeFunction(name: "fragment_main")
pipelineState = try device.makeRenderPipelineState(descriptor: pipelineDescriptor)
} catch {}
}
func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
}
func draw(in view: MTKView) {
guard let commandBuffer = commandQueue.makeCommandBuffer() else { return }
guard let passDescriptor = view.currentRenderPassDescriptor else { return }
guard let encoder = commandBuffer.makeRenderCommandEncoder(descriptor: passDescriptor) else { return }
let vertexData: [Float] = [ -0.5, -0.5, 0, 1, 0, 0,
0.5, -0.5, 0, 0, 1, 0,
0, 0.5, 0, 0, 0, 1 ]
encoder.setVertexBytes(vertexData, length: vertexData.count * MemoryLayout<Float>.stride, index: 0)
encoder.setRenderPipelineState(pipelineState)
encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 3)
encoder.endEncoding()
commandBuffer.present(view.currentDrawable!)
commandBuffer.commit()
}
}
它至少从头开始构建MTKView。但我还不确定让金属物体工作的最低可行产品是什么这可能需要几天的时间，如果有人已经弄清楚了，这可能对其他人有帮助。
我已将两者结合起来，但据我所知，它没有呈现任何内容。
import AVFoundation
import AudioToolbox
import Foundation
import QuartzCore
import Security
import WebKit
import Cocoa
import Metal
import MetalKit
import Swift
let device = MTLCreateSystemDefaultDevice()!
// Our clear color, can be set to any color
let clearColor = MTLClearColor(red: 0.1, green: 0.57, blue: 0.25, alpha: 1)
let nsapp = NSApplication.shared
let appName = ProcessInfo.processInfo.processName
let window = NSWindow(
contentRect: NSMakeRect(0, 0, 1000, 1000),
styleMask: .fullSizeContentView,
backing: NSWindow.BackingStoreType.buffered,
defer: false
)
window.cascadeTopLeft(from:NSMakePoint(20,20))
window.title = appName;
window.makeKeyAndOrderFront(nil)
struct Vertex {
var position: float3
var color: float4
}
let view = MTKView(frame: NSRect(origin: CGPoint.zero, size: window.frame.size), device: device)
window.contentView = view
view.device = device
view.colorPixelFormat = .bgra8Unorm
view.clearColor = clearColor
let queue = device.makeCommandQueue()!
var vertexBuffer: MTLBuffer!
var vertices: [Vertex] = [
Vertex(position: float3(0,1,0), color: float4(1,0,0,1)),
Vertex(position: float3(-1,-1,0), color: float4(0,1,0,1)),
Vertex(position: float3(1,-1,0), color: float4(0,0,1,1))
]
let shaders = """
#include <metal_stdlib>
using namespace metal;
// Basic Struct to match our Swift type
// This is what is passed into the Vertex Shader
struct VertexIn {
float3 position;
float4 color;
};
// What is returned by the Vertex Shader
// This is what is passed into the Fragment Shader
struct VertexOut {
float4 position [[ position ]];
float4 color;
};
vertex VertexOut basic_vertex_function(const device VertexIn *vertices [[ buffer(0) ]],
uint vertexID [[ vertex_id ]]) {
VertexOut vOut;
vOut.position = float4(vertices[vertexID].position,1);
vOut.color = vertices[vertexID].color;
return vOut;
}
fragment float4 basic_fragment_function(VertexOut vIn [[ stage_in ]]) {
return vIn.color;
}
"""
let library = try device.makeLibrary(source: shaders, options: nil)
let pipelineDescriptor = MTLRenderPipelineDescriptor()
pipelineDescriptor.colorAttachments[0].pixelFormat = .bgra8Unorm
pipelineDescriptor.vertexFunction = library.makeFunction(name: "basic_vertex_function")
pipelineDescriptor.fragmentFunction = library.makeFunction(name: "basic_fragment_function")
let pipelineState = try device.makeRenderPipelineState(descriptor: pipelineDescriptor)
vertexBuffer = device.makeBuffer(
bytes: vertices,
length: MemoryLayout<Vertex>.stride * vertices.count,
options: []
)
enum MetalErrors: Error {
case commandBuffer
case passDescriptor
case encoder
}
guard let drawable = view.currentDrawable else { throw MetalErrors.commandBuffer }
guard let commandBuffer = queue.makeCommandBuffer() else { throw MetalErrors.commandBuffer }
guard let passDescriptor = view.currentRenderPassDescriptor else { throw MetalErrors.passDescriptor }
guard let encoder = commandBuffer.makeRenderCommandEncoder(descriptor: passDescriptor) else { throw MetalErrors.encoder }
nsapp.run()
// let vertexData: [Float] = [ -0.5, -0.5, 0, 1, 0, 0,
// 0.5, -0.5, 0, 0, 1, 0,
// 0, 0.5, 0, 0, 0, 1 ]
encoder.setRenderPipelineState(pipelineState)
// encoder.setVertexBytes(vertexData, length: vertexData.count * MemoryLayout<Float>.stride, index: 0)
encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: vertices.count)
encoder.endEncoding()
commandBuffer.present(drawable)
commandBuffer.commit()
对我来说它是空白的。我也试过关注this。
This 越来越近了。
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