629 lines
17 KiB
C#
629 lines
17 KiB
C#
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/************************************************************************************
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Copyright : Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.
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Your use of this SDK or tool is subject to the Oculus SDK License Agreement, available at
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https://developer.oculus.com/licenses/oculussdk/
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Unless required by applicable law or agreed to in writing, the Utilities SDK distributed
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under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
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ANY KIND, either express or implied. See the License for the specific language governing
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permissions and limitations under the License.
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************************************************************************************/
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System;
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using UnityEngine;
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using OVRSimpleJSON;
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using System.Threading.Tasks;
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/// <summary>
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/// This is a lightweight glTF model loader that is guaranteed to work with models loaded from the Oculus runtime
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/// using OVRPlugin.LoadRenderModel. It is not recommended to be used as a general purpose glTF loader.
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/// </summary>
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public enum OVRChunkType
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{
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JSON = 0x4E4F534A,
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BIN = 0x004E4942,
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}
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public enum OVRTextureFormat
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{
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NONE,
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KTX2,
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PNG,
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JPEG,
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}
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public struct OVRBinaryChunk
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{
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public Stream chunkStream;
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public uint chunkLength;
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public long chunkStart;
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}
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public struct OVRMeshData
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{
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public Mesh mesh;
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public Material material;
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}
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public struct OVRMaterialData
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{
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public Shader shader;
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public int textureId;
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public OVRTextureData texture;
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}
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public struct OVRGLTFScene
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{
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public GameObject root;
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public List<GameObject> nodes;
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}
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public struct OVRTextureData
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{
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public byte[] data;
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public int width;
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public int height;
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public OVRTextureFormat format;
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public TextureFormat transcodedFormat;
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}
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public class OVRGLTFLoader
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{
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private JSONNode m_jsonData;
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private Stream m_glbStream;
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private OVRBinaryChunk m_binaryChunk;
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private List<GameObject> m_Nodes;
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private static readonly Vector3 GLTFToUnitySpace = new Vector3(-1, 1, 1);
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private static readonly Vector3 GLTFToUnityTangent = new Vector4(-1, 1, 1, -1);
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private Shader m_Shader = null;
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public OVRGLTFLoader(string fileName)
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{
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m_glbStream = File.Open(fileName, FileMode.Open);
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}
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public OVRGLTFLoader(byte[] data)
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{
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m_glbStream = new MemoryStream(data, 0, data.Length, false, true);
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}
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public OVRGLTFScene LoadGLB(bool loadMips = true)
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{
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OVRGLTFScene scene = new OVRGLTFScene();
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m_Nodes = new List<GameObject>();
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if (ValidateGLB(m_glbStream))
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{
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byte[] jsonChunkData = ReadChunk(m_glbStream, OVRChunkType.JSON);
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if (jsonChunkData != null)
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{
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string json = System.Text.Encoding.ASCII.GetString(jsonChunkData);
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m_jsonData = JSON.Parse(json);
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}
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uint binChunkLength = 0;
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bool validBinChunk = ValidateChunk(m_glbStream, OVRChunkType.BIN, out binChunkLength);
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if (validBinChunk && m_jsonData != null)
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{
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m_binaryChunk.chunkLength = binChunkLength;
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m_binaryChunk.chunkStart = m_glbStream.Position;
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m_binaryChunk.chunkStream = m_glbStream;
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if (m_Shader == null)
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{
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Debug.LogWarning("A shader was not set before loading the model. Using default mobile shader.");
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m_Shader = Shader.Find("Legacy Shaders/Diffuse");
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}
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LoadGLTF(loadMips);
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}
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}
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m_glbStream.Close();
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scene.nodes = m_Nodes;
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scene.root = m_Nodes[0];
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scene.root.transform.Rotate(Vector3.up, 180.0f);
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return scene;
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}
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public void SetModelShader(Shader shader)
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{
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m_Shader = shader;
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}
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private bool ValidateGLB(Stream glbStream)
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{
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// Read the magic entry and ensure value matches the glTF value
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int uint32Size = sizeof(uint);
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byte[] buffer = new byte[uint32Size];
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glbStream.Read(buffer, 0, uint32Size);
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uint magic = BitConverter.ToUInt32(buffer, 0);
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if (magic != 0x46546C67)
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{
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Debug.LogError("Data stream was not a valid glTF format");
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return false;
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}
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// Read glTF version
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glbStream.Read(buffer, 0, uint32Size);
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uint version = BitConverter.ToUInt32(buffer, 0);
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if (version != 2)
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{
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Debug.LogError("Only glTF 2.0 is supported");
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return false;
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}
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// Read glTF file size
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glbStream.Read(buffer, 0, uint32Size);
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uint length = BitConverter.ToUInt32(buffer, 0);
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if (length != glbStream.Length)
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{
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Debug.LogError("glTF header length does not match file length");
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return false;
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}
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return true;
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}
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private byte[] ReadChunk(Stream glbStream, OVRChunkType type)
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{
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uint chunkLength;
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if (ValidateChunk(glbStream, type, out chunkLength))
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{
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byte[] chunkBuffer = new byte[chunkLength];
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glbStream.Read(chunkBuffer, 0, (int)chunkLength);
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return chunkBuffer;
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}
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return null;
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}
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private bool ValidateChunk(Stream glbStream, OVRChunkType type, out uint chunkLength)
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{
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int uint32Size = sizeof(uint);
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byte[] buffer = new byte[uint32Size];
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glbStream.Read(buffer, 0, uint32Size);
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chunkLength = BitConverter.ToUInt32(buffer, 0);
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glbStream.Read(buffer, 0, uint32Size);
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uint chunkType = BitConverter.ToUInt32(buffer, 0);
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if (chunkType != (uint)type)
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{
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Debug.LogError("Read chunk does not match type.");
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return false;
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}
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return true;
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}
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private void LoadGLTF(bool loadMips)
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{
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if (m_jsonData == null)
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{
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Debug.LogError("m_jsonData was null");
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}
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var scenes = m_jsonData["scenes"];
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if (scenes.Count == 0)
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{
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Debug.LogError("No valid scenes in this glTF.");
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}
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// Create GameObjects for each node in the model so that they can be referenced during processing
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var nodes = m_jsonData["nodes"].AsArray;
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for (int i = 0; i < nodes.Count; i++)
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{
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var jsonNode = m_jsonData["nodes"][i];
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GameObject go = new GameObject(jsonNode["name"]);
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m_Nodes.Add(go);
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}
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// Limit loading to just the first scene in the glTF
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var mainScene = scenes[0];
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var rootNodes = mainScene["nodes"].AsArray;
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for (int i = 0; i < rootNodes.Count; i++)
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{
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int nodeId = rootNodes[i].AsInt;
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ProcessNode(m_jsonData["nodes"][nodeId], nodeId, loadMips);
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}
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}
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private void ProcessNode(JSONNode node, int nodeId, bool loadMips)
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{
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// Process the child nodes first
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var childNodes = node["children"];
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if (childNodes.Count > 0)
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{
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for (int i = 0; i < childNodes.Count; i++)
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{
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int childId = childNodes[i].AsInt;
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m_Nodes[childId].transform.SetParent(m_Nodes[nodeId].transform);
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ProcessNode(m_jsonData["nodes"][childId], childId, loadMips);
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}
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}
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string nodeName = node["name"].ToString();
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if (nodeName.Contains("batteryIndicator"))
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{
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GameObject.Destroy(m_Nodes[nodeId]);
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return;
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}
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if (node["mesh"] != null)
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{
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var meshId = node["mesh"].AsInt;
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OVRMeshData meshData = ProcessMesh(m_jsonData["meshes"][meshId], loadMips);
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if (node["skin"] != null)
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{
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var renderer = m_Nodes[nodeId].AddComponent<SkinnedMeshRenderer>();
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renderer.sharedMesh = meshData.mesh;
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renderer.sharedMaterial = meshData.material;
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var skinId = node["skin"].AsInt;
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ProcessSkin(m_jsonData["skins"][skinId], renderer);
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}
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else
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{
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var filter = m_Nodes[nodeId].AddComponent<MeshFilter>();
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filter.sharedMesh = meshData.mesh;
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var renderer = m_Nodes[nodeId].AddComponent<MeshRenderer>();
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renderer.sharedMaterial = meshData.material;
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}
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}
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var translation = node["translation"].AsArray;
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var rotation = node["rotation"].AsArray;
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var scale = node["scale"].AsArray;
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if (translation.Count > 0)
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{
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Vector3 position = new Vector3(
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translation[0] * GLTFToUnitySpace.x,
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translation[1] * GLTFToUnitySpace.y,
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translation[2] * GLTFToUnitySpace.z);
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m_Nodes[nodeId].transform.position = position;
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}
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if (rotation.Count > 0)
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{
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Vector3 rotationAxis = new Vector3(
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rotation[0] * GLTFToUnitySpace.x,
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rotation[1] * GLTFToUnitySpace.y,
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rotation[2] * GLTFToUnitySpace.z);
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rotationAxis *= -1.0f;
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m_Nodes[nodeId].transform.rotation = new Quaternion(rotationAxis.x, rotationAxis.y, rotationAxis.z, rotation[3]);
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}
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if (scale.Count > 0)
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{
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Vector3 scaleVec = new Vector3(scale[0], scale[1], scale[2]);
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m_Nodes[nodeId].transform.localScale = scaleVec;
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}
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}
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private OVRMeshData ProcessMesh(JSONNode meshNode, bool loadMips)
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{
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OVRMeshData meshData = new OVRMeshData();
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int totalVertexCount = 0;
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var primitives = meshNode["primitives"];
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int[] primitiveVertexCounts = new int[primitives.Count];
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for (int i = 0; i < primitives.Count; i++)
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{
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var jsonPrimitive = primitives[i];
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var jsonAttrbite = jsonPrimitive["attributes"]["POSITION"];
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var jsonAccessor = m_jsonData["accessors"][jsonAttrbite.AsInt];
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primitiveVertexCounts[i] = jsonAccessor["count"];
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totalVertexCount += primitiveVertexCounts[i];
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}
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int[][] indicies = new int[primitives.Count][];
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Vector3[] vertices = new Vector3[totalVertexCount];
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Vector3[] normals = null;
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if (primitives[0]["attributes"]["NORMAL"] != null)
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{
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normals = new Vector3[totalVertexCount];
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}
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Vector4[] tangents = null;
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if (primitives[0]["attributes"]["TANGENT"] != null)
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{
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tangents = new Vector4[totalVertexCount];
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}
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Vector2[] texcoords = null;
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if (primitives[0]["attributes"]["TEXCOORD_0"] != null)
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{
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texcoords = new Vector2[totalVertexCount];
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}
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Color[] colors = null;
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if (primitives[0]["attributes"]["COLOR_0"] != null)
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{
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colors = new Color[totalVertexCount];
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}
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BoneWeight[] boneWeights = null;
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if (primitives[0]["attributes"]["WEIGHTS_0"] != null)
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{
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boneWeights = new BoneWeight[totalVertexCount];
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}
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// Begin async processing of material and its texture
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OVRMaterialData matData = default(OVRMaterialData);
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Task transcodeTask = null;
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var jsonMaterial = primitives[0]["material"];
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if (jsonMaterial != null)
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{
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matData = ProcessMaterial(jsonMaterial.AsInt);
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matData.texture = ProcessTexture(matData.textureId);
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transcodeTask = Task.Run(() => { TranscodeTexture(ref matData.texture); });
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}
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int vertexOffset = 0;
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for (int i = 0; i < primitives.Count; i++)
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{
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var jsonPrimitive = primitives[i];
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int indicesAccessorId = jsonPrimitive["indices"].AsInt;
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var jsonAccessor = m_jsonData["accessors"][indicesAccessorId];
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OVRGLTFAccessor indicesReader = new OVRGLTFAccessor(jsonAccessor, m_jsonData);
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indicies[i] = new int[indicesReader.GetDataCount()];
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indicesReader.ReadAsInt(m_binaryChunk, ref indicies[i], 0);
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FlipTraingleIndices(ref indicies[i]);
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var jsonAttribute = jsonPrimitive["attributes"]["POSITION"];
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if (jsonAttribute != null)
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{
|
||
|
|
jsonAccessor = m_jsonData["accessors"][jsonAttribute.AsInt];
|
||
|
|
OVRGLTFAccessor dataReader = new OVRGLTFAccessor(jsonAccessor, m_jsonData);
|
||
|
|
dataReader.ReadAsVector3(m_binaryChunk, ref vertices, vertexOffset, GLTFToUnitySpace);
|
||
|
|
}
|
||
|
|
|
||
|
|
jsonAttribute = jsonPrimitive["attributes"]["NORMAL"];
|
||
|
|
if (jsonAttribute != null)
|
||
|
|
{
|
||
|
|
jsonAccessor = m_jsonData["accessors"][jsonAttribute.AsInt];
|
||
|
|
OVRGLTFAccessor dataReader = new OVRGLTFAccessor(jsonAccessor, m_jsonData);
|
||
|
|
dataReader.ReadAsVector3(m_binaryChunk, ref normals, vertexOffset, GLTFToUnitySpace);
|
||
|
|
}
|
||
|
|
|
||
|
|
jsonAttribute = jsonPrimitive["attributes"]["TANGENT"];
|
||
|
|
if (jsonAttribute != null)
|
||
|
|
{
|
||
|
|
jsonAccessor = m_jsonData["accessors"][jsonAttribute.AsInt];
|
||
|
|
OVRGLTFAccessor dataReader = new OVRGLTFAccessor(jsonAccessor, m_jsonData);
|
||
|
|
dataReader.ReadAsVector4(m_binaryChunk, ref tangents, vertexOffset, GLTFToUnityTangent);
|
||
|
|
}
|
||
|
|
|
||
|
|
jsonAttribute = jsonPrimitive["attributes"]["TEXCOORD_0"];
|
||
|
|
if (jsonAttribute != null)
|
||
|
|
{
|
||
|
|
jsonAccessor = m_jsonData["accessors"][jsonAttribute.AsInt];
|
||
|
|
OVRGLTFAccessor dataReader = new OVRGLTFAccessor(jsonAccessor, m_jsonData);
|
||
|
|
dataReader.ReadAsVector2(m_binaryChunk, ref texcoords, vertexOffset);
|
||
|
|
}
|
||
|
|
|
||
|
|
jsonAttribute = jsonPrimitive["attributes"]["COLOR_0"];
|
||
|
|
if (jsonAttribute != null)
|
||
|
|
{
|
||
|
|
jsonAccessor = m_jsonData["accessors"][jsonAttribute.AsInt];
|
||
|
|
OVRGLTFAccessor dataReader = new OVRGLTFAccessor(jsonAccessor, m_jsonData);
|
||
|
|
dataReader.ReadAsColor(m_binaryChunk, ref colors, vertexOffset);
|
||
|
|
}
|
||
|
|
|
||
|
|
jsonAttribute = jsonPrimitive["attributes"]["WEIGHTS_0"];
|
||
|
|
if (jsonAttribute != null)
|
||
|
|
{
|
||
|
|
jsonAccessor = m_jsonData["accessors"][jsonAttribute.AsInt];
|
||
|
|
OVRGLTFAccessor weightReader = new OVRGLTFAccessor(jsonAccessor, m_jsonData);
|
||
|
|
|
||
|
|
var jointAttribute = jsonPrimitive["attributes"]["JOINTS_0"];
|
||
|
|
var jointAccessor = m_jsonData["accessors"][jointAttribute.AsInt];
|
||
|
|
OVRGLTFAccessor jointReader = new OVRGLTFAccessor(jointAccessor, m_jsonData);
|
||
|
|
|
||
|
|
Vector4[] weights = new Vector4[weightReader.GetDataCount()];
|
||
|
|
Vector4[] joints = new Vector4[jointReader.GetDataCount()];
|
||
|
|
|
||
|
|
weightReader.ReadAsBoneWeights(m_binaryChunk, ref weights, 0);
|
||
|
|
jointReader.ReadAsVector4(m_binaryChunk, ref joints, 0, Vector4.one);
|
||
|
|
|
||
|
|
for (int w = 0; w < weights.Length; w++)
|
||
|
|
{
|
||
|
|
boneWeights[vertexOffset + w].boneIndex0 = (int)joints[w].x;
|
||
|
|
boneWeights[vertexOffset + w].boneIndex1 = (int)joints[w].y;
|
||
|
|
boneWeights[vertexOffset + w].boneIndex2 = (int)joints[w].z;
|
||
|
|
boneWeights[vertexOffset + w].boneIndex3 = (int)joints[w].w;
|
||
|
|
|
||
|
|
boneWeights[vertexOffset + w].weight0 = weights[w].x;
|
||
|
|
boneWeights[vertexOffset + w].weight1 = weights[w].y;
|
||
|
|
boneWeights[vertexOffset + w].weight2 = weights[w].z;
|
||
|
|
boneWeights[vertexOffset + w].weight3 = weights[w].w;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
vertexOffset += primitiveVertexCounts[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
Mesh mesh = new Mesh();
|
||
|
|
mesh.vertices = vertices;
|
||
|
|
mesh.normals = normals;
|
||
|
|
mesh.tangents = tangents;
|
||
|
|
mesh.colors = colors;
|
||
|
|
mesh.uv = texcoords;
|
||
|
|
mesh.boneWeights = boneWeights;
|
||
|
|
mesh.subMeshCount = primitives.Count;
|
||
|
|
|
||
|
|
int baseVertex = 0;
|
||
|
|
for(int i = 0; i < primitives.Count; i++)
|
||
|
|
{
|
||
|
|
mesh.SetIndices(indicies[i], MeshTopology.Triangles, i, false, baseVertex);
|
||
|
|
baseVertex += primitiveVertexCounts[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
mesh.RecalculateBounds();
|
||
|
|
meshData.mesh = mesh;
|
||
|
|
|
||
|
|
if (transcodeTask != null)
|
||
|
|
{
|
||
|
|
transcodeTask.Wait();
|
||
|
|
meshData.material = CreateUnityMaterial(matData, loadMips);
|
||
|
|
}
|
||
|
|
return meshData;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static void FlipTraingleIndices(ref int[] indices)
|
||
|
|
{
|
||
|
|
for (int i = 0; i < indices.Length; i += 3)
|
||
|
|
{
|
||
|
|
int a = indices[i];
|
||
|
|
indices[i] = indices[i + 2];
|
||
|
|
indices[i + 2] = a;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private void ProcessSkin(JSONNode skinNode, SkinnedMeshRenderer renderer)
|
||
|
|
{
|
||
|
|
Matrix4x4[] inverseBindMatrices = null;
|
||
|
|
if (skinNode["inverseBindMatrices"] != null)
|
||
|
|
{
|
||
|
|
int inverseBindMatricesId = skinNode["inverseBindMatrices"].AsInt;
|
||
|
|
var jsonInverseBindMatrices = m_jsonData["accessors"][inverseBindMatricesId];
|
||
|
|
|
||
|
|
OVRGLTFAccessor dataReader = new OVRGLTFAccessor(jsonInverseBindMatrices, m_jsonData);
|
||
|
|
inverseBindMatrices = new Matrix4x4[dataReader.GetDataCount()];
|
||
|
|
dataReader.ReadAsMatrix4x4(m_binaryChunk, ref inverseBindMatrices, 0, GLTFToUnitySpace);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (skinNode["skeleton"] != null)
|
||
|
|
{
|
||
|
|
var skeletonRootId = skinNode["skeleton"].AsInt;
|
||
|
|
renderer.rootBone = m_Nodes[skeletonRootId].transform;
|
||
|
|
}
|
||
|
|
|
||
|
|
Transform[] bones = null;
|
||
|
|
if (skinNode["joints"] != null)
|
||
|
|
{
|
||
|
|
var joints = skinNode["joints"].AsArray;
|
||
|
|
|
||
|
|
bones = new Transform[joints.Count];
|
||
|
|
for (int i = 0; i < joints.Count; i++)
|
||
|
|
{
|
||
|
|
bones[i] = m_Nodes[joints[i]].transform;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
renderer.sharedMesh.bindposes = inverseBindMatrices;
|
||
|
|
renderer.bones = bones;
|
||
|
|
}
|
||
|
|
|
||
|
|
private OVRMaterialData ProcessMaterial(int matId)
|
||
|
|
{
|
||
|
|
OVRMaterialData matData = new OVRMaterialData();
|
||
|
|
|
||
|
|
var jsonMaterial = m_jsonData["materials"][matId];
|
||
|
|
var jsonPbrDetails = jsonMaterial["pbrMetallicRoughness"];
|
||
|
|
|
||
|
|
var jsonBaseColor = jsonPbrDetails["baseColorTexture"];
|
||
|
|
if (jsonBaseColor != null)
|
||
|
|
{
|
||
|
|
int textureId = jsonBaseColor["index"].AsInt;
|
||
|
|
matData.textureId = textureId;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
var jsonTextrure = jsonMaterial["emissiveTexture"];
|
||
|
|
if (jsonTextrure != null)
|
||
|
|
{
|
||
|
|
int textureId = jsonTextrure["index"].AsInt;
|
||
|
|
matData.textureId = textureId;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
matData.shader = m_Shader;
|
||
|
|
return matData;
|
||
|
|
}
|
||
|
|
|
||
|
|
private OVRTextureData ProcessTexture(int textureId)
|
||
|
|
{
|
||
|
|
var jsonTexture = m_jsonData["textures"][textureId];
|
||
|
|
|
||
|
|
int imageSource = -1;
|
||
|
|
var jsonExtensions = jsonTexture["extensions"];
|
||
|
|
if (jsonExtensions != null)
|
||
|
|
{
|
||
|
|
var baisuExtension = jsonExtensions["KHR_texture_basisu"];
|
||
|
|
if (baisuExtension != null)
|
||
|
|
{
|
||
|
|
imageSource = baisuExtension["source"].AsInt;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
imageSource = jsonTexture["source"].AsInt;
|
||
|
|
}
|
||
|
|
var jsonSource = m_jsonData["images"][imageSource];
|
||
|
|
|
||
|
|
int sampler = jsonTexture["sampler"].AsInt;
|
||
|
|
var jsonSampler = m_jsonData["samplers"][sampler];
|
||
|
|
|
||
|
|
int bufferViewId = jsonSource["bufferView"].AsInt;
|
||
|
|
var jsonBufferView = m_jsonData["bufferViews"][bufferViewId];
|
||
|
|
OVRGLTFAccessor dataReader = new OVRGLTFAccessor(jsonBufferView, m_jsonData, true);
|
||
|
|
|
||
|
|
OVRTextureData textureData = new OVRTextureData();
|
||
|
|
if (jsonSource["mimeType"].Value == "image/ktx2")
|
||
|
|
{
|
||
|
|
textureData.data = dataReader.ReadAsKtxTexture(m_binaryChunk);
|
||
|
|
textureData.format = OVRTextureFormat.KTX2;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
Debug.LogWarning("Unsupported image mimeType.");
|
||
|
|
}
|
||
|
|
return textureData;
|
||
|
|
}
|
||
|
|
|
||
|
|
private void TranscodeTexture(ref OVRTextureData textureData)
|
||
|
|
{
|
||
|
|
if (textureData.format == OVRTextureFormat.KTX2)
|
||
|
|
{
|
||
|
|
OVRKtxTexture.Load(textureData.data, ref textureData);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
Debug.LogWarning("Only KTX2 textures can be trascoded.");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private Material CreateUnityMaterial(OVRMaterialData matData, bool loadMips)
|
||
|
|
{
|
||
|
|
Material mat = new Material(matData.shader);
|
||
|
|
|
||
|
|
if (matData.texture.format == OVRTextureFormat.KTX2)
|
||
|
|
{
|
||
|
|
Texture2D texture;
|
||
|
|
texture = new Texture2D(matData.texture.width, matData.texture.height, matData.texture.transcodedFormat, loadMips);
|
||
|
|
texture.LoadRawTextureData(matData.texture.data);
|
||
|
|
texture.Apply(false, true);
|
||
|
|
mat.mainTexture = texture;
|
||
|
|
}
|
||
|
|
return mat;
|
||
|
|
}
|
||
|
|
}
|