mirror of
https://github.com/OpenEmu/OpenEmu-Shaders.git
synced 2025-11-01 11:07:54 +00:00
Stuart Carnie
45 lines
1.3 KiB
Swift
45 lines
1.3 KiB
Swift
// swiftformat:disable consecutiveSpaces
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//
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// File.swift
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//
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//
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// Created by Stuart Carnie on 25/5/2022.
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//
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import simd
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extension simd_float4x4 {
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// swiftlint:disable identifier_name colon
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static func makeOrtho(left: Float, right: Float, top: Float, bottom: Float) -> Self {
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let near: Float = 0.0
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let far: Float = 1.0
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let sx: Float = 2.0 / (right - left)
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let sy: Float = 2.0 / (top - bottom)
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let sz: Float = 1.0 / (far - near)
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let tx: Float = (right + left) / (left - right)
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let ty: Float = (top + bottom) / (bottom - top)
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let tz: Float = near / (far - near)
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let P = simd_float4(x: sx, y: 0, z: 0, w: 0)
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let Q = simd_float4(x: 0, y: sy, z: 0, w: 0)
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let R = simd_float4(x: 0, y: 0, z: sz, w: 0)
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let S = simd_float4(x: tx, y: ty, z: tz, w: 1)
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return simd_float4x4(P, Q, R, S)
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}
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static func makeRotated(z: Float) -> Self {
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var cz: Float = 0, sz: Float = 0
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__sincosf(z, &sz, &cz)
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let P = simd_float4(x: cz, y: -sz, z: 0, w: 0)
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let Q = simd_float4(x: sz, y: cz, z: 0, w: 0)
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let R = simd_float4(x: 0, y: 0, z: 0, w: 0)
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let S = simd_float4(x: 0, y: 0, z: 0, w: 1)
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return simd_float4x4(P, Q, R, S)
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}
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}
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