119 lines
4.4 KiB
Swift
119 lines
4.4 KiB
Swift
//
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// MetalView.swift
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// chapter05
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//
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// Created by Marius on 2/3/16.
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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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var uniformBuffer: MTLBuffer!
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required init(coder: NSCoder) {
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super.init(coder: coder)
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createBuffers()
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registerShaders()
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}
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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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struct Matrix {
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var m: [Float]
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init() {
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m = [1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0,
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0, 0, 0, 1
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]
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}
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func translationMatrix(_ matrix: Matrix, _ position: float3) -> Matrix {
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var matrix = matrix
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matrix.m[12] = position.x
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matrix.m[13] = position.y
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matrix.m[14] = position.z
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return matrix
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}
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func scalingMatrix(_ matrix: Matrix, _ scale: Float) -> Matrix {
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var matrix = matrix
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matrix.m[0] = scale
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matrix.m[5] = scale
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matrix.m[10] = scale
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matrix.m[15] = 1.0
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return matrix
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}
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func rotationMatrix(_ matrix: Matrix, _ rot: float3) -> Matrix {
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var matrix = matrix
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matrix.m[0] = cos(rot.y) * cos(rot.z)
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matrix.m[4] = cos(rot.z) * sin(rot.x) * sin(rot.y) - cos(rot.x) * sin(rot.z)
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matrix.m[8] = cos(rot.x) * cos(rot.z) * sin(rot.y) + sin(rot.x) * sin(rot.z)
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matrix.m[1] = cos(rot.y) * sin(rot.z)
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matrix.m[5] = cos(rot.x) * cos(rot.z) + sin(rot.x) * sin(rot.y) * sin(rot.z)
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matrix.m[9] = -cos(rot.z) * sin(rot.x) + cos(rot.x) * sin(rot.y) * sin(rot.z)
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matrix.m[2] = -sin(rot.y)
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matrix.m[6] = cos(rot.y) * sin(rot.x)
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matrix.m[10] = cos(rot.x) * cos(rot.y)
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matrix.m[15] = 1.0
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return matrix
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}
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func modelMatrix(_ matrix: Matrix) -> Matrix {
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var matrix = matrix
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matrix = rotationMatrix(matrix, float3(0.0, 0.0, 0.1))
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matrix = scalingMatrix(matrix, 0.25)
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matrix = translationMatrix(matrix, float3(0.0, 0.5, 0.0))
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return matrix
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}
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}
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func createBuffers() {
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device = MTLCreateSystemDefaultDevice()!
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commandQueue = device!.newCommandQueue()
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let vertex_data = [Vertex(position: [-1.0, -1.0, 0.0, 1.0], color: [1, 0, 0, 1]),
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Vertex(position: [ 1.0, -1.0, 0.0, 1.0], color: [0, 1, 0, 1]),
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Vertex(position: [ 0.0, 1.0, 0.0, 1.0], color: [0, 0, 1, 1])
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]
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vertexBuffer = device!.newBuffer(withBytes: vertex_data, length: sizeof(Vertex.self) * 3, options:[])
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uniformBuffer = device!.newBuffer(withLength: sizeof(Float.self) * 16, options: [])
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let bufferPointer = uniformBuffer.contents()
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memcpy(bufferPointer, Matrix().modelMatrix(Matrix()).m, sizeof(Float.self) * 16)
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}
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func registerShaders() {
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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 rpd = currentRenderPassDescriptor, drawable = currentDrawable {
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rpd.colorAttachments[0].clearColor = MTLClearColorMake(0.5, 0.5, 0.5, 1.0)
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let commandBuffer = device!.newCommandQueue().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.setVertexBuffer(uniformBuffer, offset: 0, at: 1)
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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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