63 lines
1.7 KiB
Swift
63 lines
1.7 KiB
Swift
//
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// MathUtils.swift
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// chapter07
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//
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// Created by Marius on 3/1/16.
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// Copyright © 2016 Marius Horga. All rights reserved.
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//
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import simd
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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(var matrix: Matrix, _ position: float3) -> 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(var matrix: Matrix, _ scale: Float) -> 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(var matrix: Matrix, _ rot: float3) -> 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(var matrix: 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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