72 lines
2.6 KiB
C#
72 lines
2.6 KiB
C#
// SPDX-FileCopyrightText: 2025 Unity Technologies and the glTFast authors
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// SPDX-License-Identifier: Apache-2.0
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using System;
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using System.Runtime.CompilerServices;
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using Unity.Mathematics;
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namespace GLTFast
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{
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/// <summary>A 3 component vector of signed bytes.</summary>
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struct sbyte3
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{
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/// <summary>x component of the vector.</summary>
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public sbyte x;
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/// <summary>y component of the vector.</summary>
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public sbyte y;
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/// <summary>z component of the vector.</summary>
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public sbyte z;
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/// <summary>Constructs an sbyte3 vector from three sbyte values.</summary>
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/// <param name="x">The constructed vector's x component will be set to this value.</param>
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/// <param name="y">The constructed vector's y component will be set to this value.</param>
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/// <param name="z">The constructed vector's z component will be set to this value.</param>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public sbyte3(sbyte x, sbyte y, sbyte z)
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{
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this.x = x;
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this.y = y;
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this.z = z;
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}
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/// <summary>
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/// Converts 3 component vector from signed byte in glTF space to
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/// float in Unity space.
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/// </summary>
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/// <returns>3 component vector in Unity space.</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public float3 GltfToUnityFloat3()
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{
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return new float3(-x, y, z);
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}
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/// <summary>
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/// Converts 3 component vector from signed byte in glTF space to
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/// normalized float vector in Unity space. Applies normalization as last step to ensure a magnitude of 1.0.
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/// </summary>
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/// <returns>Normalized 3 component vector in Unity space.</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public float3 GltfNormalToUnityFloat3()
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{
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var tmp = new float3(x, y, z) / 127f;
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tmp = math.max(tmp, -1f);
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tmp.x *= -1;
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return math.normalize(tmp);
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}
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/// <summary>
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/// Converts 3 component vector from unsigned byte in glTF space to
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/// normalized float vector in Unity space.
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/// </summary>
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/// <returns>Normalized 3 component vector in Unity space.</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public float3 GltfToUnityNormalizedFloat3()
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{
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var tmp = new float3(x, y, z) / 127f;
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tmp = math.max(tmp, -1f);
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tmp.x *= -1;
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return tmp;
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}
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}
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}
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