MobModel.cs

using Godot;
using ICSharpCode.SharpZipLib.Zip;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using static System.Console;

class MobModel : Godot.Object {
	public static MobModel Read(Stream fs) {
		var zip = new ZipFile(fs);
		var zonefile = zip.GetInputStream(zip.GetEntry("ORC_ACTORDEF.oec"));
		var reader = new BinaryReader(zonefile);

		var obj = new ArrayMesh();
		var nummeshes = reader.ReadInt32();
		for(var i = 0; i < nummeshes; ++i) {
			var flags = reader.ReadUInt32();
			var numtex = reader.ReadUInt32();
			var textures = new Texture[numtex];
			for(var j = 0; j < numtex; ++j) {
				var fn = reader.ReadString();
				var entry = zip.GetEntry(fn);
				textures[j] = TextureLoader.Load(zip.GetInputStream(entry), (int) entry.Size, flags != 1);
			}
			var mat = new SpatialMaterial();
			if(numtex > 0)
				mat.AlbedoTexture = textures[0];
			if(flags == 1)
				mat.ParamsUseAlphaScissor = true;
			//else if(flags != 0)
			//	mat.FlagsTransparent = true;

			var numvert = reader.ReadInt32();
			var arrays = new object[ArrayMesh.ARRAY_MAX];
			arrays[ArrayMesh.ARRAY_VERTEX] = Enumerable.Range(0, numvert).Select(_ => reader.ReadVector3()).ToArray();
			arrays[ArrayMesh.ARRAY_NORMAL] = Enumerable.Range(0, numvert).Select(_ => reader.ReadVector3()).ToArray();
			arrays[ArrayMesh.ARRAY_TEX_UV] = Enumerable.Range(0, numvert).Select(_ => reader.ReadVector2()).ToArray();
			arrays[ArrayMesh.ARRAY_BONES] = Enumerable.Range(0, numvert * 4).Select(o => (o & 3) == 0 ? reader.ReadUInt32() : 0f).ToArray();
			arrays[ArrayMesh.ARRAY_WEIGHTS] = Enumerable.Range(0, numvert * 4).Select(o => (o & 3) == 0 ? 1f : 0f).ToArray();
			var numpoly = reader.ReadInt32();
			var ind = Enumerable.Range(0, numpoly * 3).Select(_ => (int) reader.ReadUInt32()).ToArray();
			arrays[ArrayMesh.ARRAY_INDEX] = ind;
			obj.AddSurfaceFromArrays(VisualServer.PRIMITIVE_TRIANGLES, arrays);
			obj.SurfaceSetMaterial(i, mat);
		}

		var sp = new Spatial();

		var numbones = reader.ReadUInt32();
		var skel = new Skeleton();
		skel.RotateX(-Mathf.PI / 2);
		sp.AddChild(skel);
		skel.SetName("skel");
		for(var i = 0; i < numbones; ++i) {
			skel.AddBone($"bone_{i}");
			skel.SetBoneParent(i, reader.ReadInt32());
		}

		var numanim = reader.ReadUInt32();
		var aniplayer = new AnimationPlayer();
		aniplayer.SetName("aniplayer");
		for(var i = 0; i < numanim; ++i) {
			var name = reader.ReadString();
			var ani = new Animation();
			var boneframes = new List<Tuple<Vector3, Quat>>[numbones];
			for(var j = 0; j < numbones; ++j) {
				ani.AddTrack(Animation.TYPE_TRANSFORM);
				ani.TrackSetPath(j, $"skel:bone_{j}");
				var numframes = reader.ReadUInt32();
				for(var k = 0; k < numframes; ++k)
					ani.TransformTrackInsertKey(j, 0.1f * k, reader.ReadVector3(), reader.ReadQuat(), new Vector3(1, 1, 1));
			}
			aniplayer.AddAnimation(name, ani);
		}

		sp.AddChild(aniplayer);
		aniplayer.SetActive(true);
		aniplayer.Play("C09");
		
		var mi = new MeshInstance { Mesh = obj };
		skel.AddChild(mi);

		return new MobModel(sp);
	}

	public Spatial Node;
	AnimationPlayer AniPlayer;
	string Looping = null;

	public string[] Animations;

	MobModel(Spatial root) {
		Node = root;
		AniPlayer = (AnimationPlayer) root.GetNode("aniplayer");
		AniPlayer.Connect("animation_finished", this, "AnimationFinished");
		Animations = AniPlayer.GetAnimationList();
	}

	public MobModel Instantiate() {
		return new MobModel((Spatial) Node.Duplicate());
	}

	public void StartAnimation(string name, bool loop = true) {
		Looping = loop ? name : null;
		AniPlayer.Play(name);
	}

	void AnimationFinished(string old) {
		if(Looping != null)
			AniPlayer.Play(Looping);
	}
}