uniquake/Assets/Scripts/Support/TextureSet.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TextureSet
{
    public List<TextureSkin> Skins { get; } = new List<TextureSkin>();

    public TexturePair PrimaryTextures => Skins.Count > 0 && Skins[0].Frames.Count > 0 ? Skins[0].Frames[0] : null;

    public bool Import(GameAssets assets, QGLTexture[][] textures, QGLTexture[][] fullBrights)
    {
        if (textures == null)
            return false;

        for (int skinIndex = 0; skinIndex < textures.Length; skinIndex++)
        {
            if (textures[skinIndex] == null)
                break;

            var skin = new TextureSkin();
            if (skin.Import(assets, textures[skinIndex],
                fullBrights != null && skinIndex < fullBrights.Length ? fullBrights[skinIndex] : null))
            {
                Skins.Add(skin);
            }
        }

        return true;
    }
}

public class TextureSkin
{
    public List<TexturePair> Frames { get; } = new List<TexturePair>();

    public bool Import(GameAssets assets, QGLTexture[] textures, QGLTexture[] fullBrights)
    {
        if (textures == null)
            return false;

        for (int frameIndex = 0; frameIndex < textures.Length; frameIndex++)
        {
            if (textures[frameIndex] == null)
                break;

            var frame = new TexturePair();
            if (frame.Import(assets, textures[frameIndex],
                fullBrights != null && frameIndex < fullBrights.Length ? fullBrights[frameIndex] : null))
            {
                Frames.Add(frame);
            }
        }

        return true;
    }
}

public class TexturePair
{
    public Texture2D MainTexture { get; private set; }
    
    public Texture2D FullBrightTexture { get; private set; }

    public bool Import(GameAssets assets, QGLTexture texture, QGLTexture fullBright)
    {
        if (texture == null)
            return false;
        
        if (assets.TryGetTexture(texture.texNum, out var mainTexture))
        {
            MainTexture = mainTexture;
        }

        if (fullBright != null && assets.TryGetTexture(fullBright.texNum, out var fullBrightTexture))
        {
            FullBrightTexture = fullBrightTexture;
        }

        return true;
    }
}