mirror of
https://github.com/xiaopeng12138/MaiDXR.git
synced 2024-12-18 20:05:52 +01:00
443 lines
13 KiB
C#
443 lines
13 KiB
C#
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* Licensed under the Oculus SDK License Agreement (the "License");
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* you may not use the Oculus SDK except in compliance with the License,
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* which is provided at the time of installation or download, or which
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* otherwise accompanies this software in either electronic or hard copy form.
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*
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* You may obtain a copy of the License at
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*
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* https://developer.oculus.com/licenses/oculussdk/
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*
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* Unless required by applicable law or agreed to in writing, the Oculus SDK
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* 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 Unity.Jobs;
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using Unity.Collections;
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public enum OVRGLTFType
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{
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NONE,
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SCALAR,
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VEC2,
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VEC3,
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VEC4,
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MAT4,
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}
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public enum OVRGLTFComponentType
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{
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BYTE = 5120,
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UNSIGNED_BYTE = 5121,
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SHORT = 5122,
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UNSIGNED_SHORT = 5123,
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UNSIGNED_INT = 5125,
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FLOAT = 5126,
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}
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public class OVRGLTFAccessor
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{
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// Buffer View parameters
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private int byteOffset;
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private int byteLength;
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private int byteStride;
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private int bufferId;
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private int bufferLength;
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// Accessor parameters
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private int additionalOffset;
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private OVRGLTFType dataType;
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private OVRGLTFComponentType componentType;
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private int dataCount;
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public OVRGLTFAccessor(JSONNode node, JSONNode root, bool bufferViewOnly = false)
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{
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JSONNode jsonBufferView = node;
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if (!bufferViewOnly)
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{
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additionalOffset = node["byteOffset"].AsInt;
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dataType = ToOVRType(node["type"].Value);
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componentType = (OVRGLTFComponentType)node["componentType"].AsInt;
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dataCount = node["count"].AsInt;
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int bufferViewId = node["bufferView"].AsInt;
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jsonBufferView = root["bufferViews"][bufferViewId];
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}
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int bufferId = jsonBufferView["buffer"].AsInt;
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byteOffset = jsonBufferView["byteOffset"].AsInt;
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byteLength = jsonBufferView["byteLength"].AsInt;
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byteStride = jsonBufferView["byteStride"].AsInt;
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var jsonBuffer = root["buffers"][bufferId];
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bufferLength = jsonBuffer["byteLength"].AsInt;
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}
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public int GetDataCount()
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{
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return dataCount;
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}
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private static OVRGLTFType ToOVRType(string type)
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{
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switch(type)
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{
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case "SCALAR":
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return OVRGLTFType.SCALAR;
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case "VEC2":
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return OVRGLTFType.VEC2;
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case "VEC3":
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return OVRGLTFType.VEC3;
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case "VEC4":
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return OVRGLTFType.VEC4;
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case "MAT4":
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return OVRGLTFType.MAT4;
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default:
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Debug.LogError("Unsupported accessor type.");
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return OVRGLTFType.NONE;
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}
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}
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public void ReadAsInt(OVRBinaryChunk chunk, ref int[] data, int offset)
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{
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if (dataType != OVRGLTFType.SCALAR)
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{
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Debug.LogError("Tried to read non-scalar data as a uint array.");
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return;
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}
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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int stride = byteStride > 0 ? byteStride : GetStrideForType(componentType);
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for(int i = 0; i < dataCount; i++)
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{
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data[offset + i] = (int)ReadElementAsUint(bufferData, i * stride, componentType);
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}
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}
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public void ReadAsVector2(OVRBinaryChunk chunk, ref Vector2[] data, int offset)
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{
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if (dataType != OVRGLTFType.VEC2)
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{
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Debug.LogError("Tried to read non-vec3 data as a vec2 array.");
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return;
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}
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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int dataTypeSize = GetStrideForType(componentType);
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int stride = byteStride > 0 ? byteStride : dataTypeSize * 2;
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for (int i = 0; i < dataCount; i++)
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{
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if (componentType == OVRGLTFComponentType.FLOAT)
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{
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data[offset + i].x = ReadElementAsFloat(bufferData, i * stride);
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data[offset + i].y = ReadElementAsFloat(bufferData, i * stride + dataTypeSize);
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}
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}
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}
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public void ReadAsVector3(OVRBinaryChunk chunk, ref Vector3[] data, int offset, Vector3 conversionScale)
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{
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if (dataType != OVRGLTFType.VEC3)
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{
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Debug.LogError("Tried to read non-vec3 data as a vec3 array.");
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return;
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}
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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int dataTypeSize = GetStrideForType(componentType);
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int stride = byteStride > 0 ? byteStride : dataTypeSize * 3;
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for (int i = 0; i < dataCount; i++)
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{
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if (componentType == OVRGLTFComponentType.FLOAT)
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{
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data[offset + i].x = ReadElementAsFloat(bufferData, i * stride);
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data[offset + i].y = ReadElementAsFloat(bufferData, i * stride + dataTypeSize);
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data[offset + i].z = ReadElementAsFloat(bufferData, i * stride + dataTypeSize * 2);
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}
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else
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{
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data[offset + i].x = ReadElementAsUint(bufferData, i * stride, componentType);
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data[offset + i].y = ReadElementAsUint(bufferData, i * stride + dataTypeSize, componentType);
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data[offset + i].z = ReadElementAsUint(bufferData, i * stride + dataTypeSize * 2, componentType);
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}
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data[offset + i].Scale(conversionScale);
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}
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}
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public void ReadAsVector4(OVRBinaryChunk chunk, ref Vector4[] data, int offset, Vector4 conversionScale)
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{
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if (dataType != OVRGLTFType.VEC4)
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{
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Debug.LogError("Tried to read non-vec4 data as a vec4 array.");
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return;
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}
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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int dataTypeSize = GetStrideForType(componentType);
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int stride = byteStride > 0 ? byteStride : dataTypeSize * 4;
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for (int i = 0; i < dataCount; i++)
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{
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if (componentType == OVRGLTFComponentType.FLOAT)
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{
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data[offset + i].x = ReadElementAsFloat(bufferData, i * stride);
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data[offset + i].y = ReadElementAsFloat(bufferData, i * stride + dataTypeSize);
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data[offset + i].z = ReadElementAsFloat(bufferData, i * stride + dataTypeSize * 2);
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data[offset + i].w = ReadElementAsFloat(bufferData, i * stride + dataTypeSize * 3);
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}
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else
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{
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data[offset + i].x = ReadElementAsUint(bufferData, i * stride, componentType);
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data[offset + i].y = ReadElementAsUint(bufferData, i * stride + dataTypeSize, componentType);
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data[offset + i].z = ReadElementAsUint(bufferData, i * stride + dataTypeSize * 2, componentType);
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data[offset + i].w = ReadElementAsUint(bufferData, i * stride + dataTypeSize * 3, componentType);
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}
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data[offset + i].Scale(conversionScale);
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}
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}
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public void ReadAsColor(OVRBinaryChunk chunk, ref Color[] data, int offset)
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{
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if (dataType != OVRGLTFType.VEC4 && dataType != OVRGLTFType.VEC3)
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{
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Debug.LogError("Tried to read non-color type as a color array.");
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return;
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}
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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int vecSize = dataType == OVRGLTFType.VEC3 ? 3 : 4;
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int dataTypeSize = GetStrideForType(componentType);
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int stride = byteStride > 0 ? byteStride : dataTypeSize * vecSize;
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float maxValue = GetMaxValueForType(componentType);
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for (int i = 0; i < dataCount; i++)
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{
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if (componentType == OVRGLTFComponentType.FLOAT)
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{
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data[offset + i].r = ReadElementAsFloat(bufferData, i * stride);
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data[offset + i].g = ReadElementAsFloat(bufferData, i * stride + dataTypeSize);
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data[offset + i].b = ReadElementAsFloat(bufferData, i * stride + dataTypeSize * 2);
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data[offset + i].a = dataType == OVRGLTFType.VEC3 ? 1.0f : ReadElementAsFloat(bufferData, i * stride + dataTypeSize * 3);
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}
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else
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{
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data[offset + i].r = ReadElementAsUint(bufferData, i * stride, componentType) / maxValue;
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data[offset + i].g = ReadElementAsUint(bufferData, i * stride + dataTypeSize, componentType) / maxValue;
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data[offset + i].b = ReadElementAsUint(bufferData, i * stride + dataTypeSize * 2, componentType) / maxValue;
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data[offset + i].a = dataType == OVRGLTFType.VEC3 ? 1.0f : ReadElementAsUint(bufferData, i * stride + dataTypeSize * 3, componentType) / maxValue;
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}
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}
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}
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public void ReadAsMatrix4x4(OVRBinaryChunk chunk, ref Matrix4x4[] data, int offset, Vector3 conversionScale)
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{
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if (dataType != OVRGLTFType.MAT4)
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{
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Debug.LogError("Tried to read non-vec3 data as a vec3 array.");
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return;
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}
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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int dataTypeSize = GetStrideForType(componentType);
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int stride = byteStride > 0 ? byteStride : dataTypeSize * 16;
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Matrix4x4 scale = Matrix4x4.Scale(conversionScale);
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for (int i = 0; i < dataCount; i++)
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{
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for (int m = 0; m < 16; m++)
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{
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data[offset + i][m] = ReadElementAsFloat(bufferData, i * stride + dataTypeSize * m);
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}
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data[offset + i] = scale * data[offset + i] * scale;
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}
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}
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public byte[] ReadAsKtxTexture(OVRBinaryChunk chunk)
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{
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return null;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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return bufferData;
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}
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public void ReadAsBoneWeights(OVRBinaryChunk chunk, ref Vector4[] data, int offset)
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{
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if (dataType != OVRGLTFType.VEC4)
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{
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Debug.LogError("Tried to read bone weights data as a non-vec4 array.");
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return;
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}
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if (chunk.chunkLength != bufferLength)
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{
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Debug.LogError("Chunk length is not equal to buffer length.");
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return;
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}
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byte[] bufferData = new byte[byteLength];
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chunk.chunkStream.Seek(chunk.chunkStart + byteOffset + additionalOffset, SeekOrigin.Begin);
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chunk.chunkStream.Read(bufferData, 0, byteLength);
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int dataTypeSize = GetStrideForType(componentType);
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int stride = byteStride > 0 ? byteStride : dataTypeSize * 4;
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for (int i = 0; i < dataCount; i++)
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{
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data[offset + i].x = ReadElementAsFloat(bufferData, i * stride);
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data[offset + i].y = ReadElementAsFloat(bufferData, i * stride + dataTypeSize);
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data[offset + i].z = ReadElementAsFloat(bufferData, i * stride + dataTypeSize * 2);
|
||
|
|
data[offset + i].w = ReadElementAsFloat(bufferData, i * stride + dataTypeSize * 3);
|
||
|
|
|
||
|
|
float weightSum = data[offset + i].x + data[offset + i].y + data[offset + i].z + data[offset + i].w;
|
||
|
|
if (!Mathf.Approximately(weightSum, 0))
|
||
|
|
{
|
||
|
|
data[offset + i] /= weightSum;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private int GetStrideForType(OVRGLTFComponentType type)
|
||
|
|
{
|
||
|
|
switch (type)
|
||
|
|
{
|
||
|
|
case OVRGLTFComponentType.BYTE:
|
||
|
|
return sizeof(sbyte);
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_BYTE:
|
||
|
|
return sizeof(byte);
|
||
|
|
case OVRGLTFComponentType.SHORT:
|
||
|
|
return sizeof(short);
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_SHORT:
|
||
|
|
return sizeof(ushort);
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_INT:
|
||
|
|
return sizeof(uint);
|
||
|
|
case OVRGLTFComponentType.FLOAT:
|
||
|
|
return sizeof(float);
|
||
|
|
default:
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private float GetMaxValueForType(OVRGLTFComponentType type)
|
||
|
|
{
|
||
|
|
switch (type)
|
||
|
|
{
|
||
|
|
case OVRGLTFComponentType.BYTE:
|
||
|
|
return sbyte.MaxValue;
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_BYTE:
|
||
|
|
return byte.MaxValue;
|
||
|
|
case OVRGLTFComponentType.SHORT:
|
||
|
|
return short.MaxValue;
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_SHORT:
|
||
|
|
return ushort.MaxValue;
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_INT:
|
||
|
|
return uint.MaxValue;
|
||
|
|
case OVRGLTFComponentType.FLOAT:
|
||
|
|
return float.MaxValue;
|
||
|
|
default:
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private uint ReadElementAsUint(byte[] data, int index, OVRGLTFComponentType type)
|
||
|
|
{
|
||
|
|
switch(type)
|
||
|
|
{
|
||
|
|
case OVRGLTFComponentType.BYTE:
|
||
|
|
return (uint)Convert.ToSByte(data[index]);
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_BYTE:
|
||
|
|
return data[index];
|
||
|
|
case OVRGLTFComponentType.SHORT:
|
||
|
|
return (uint)BitConverter.ToInt16(data, index);
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_SHORT:
|
||
|
|
return BitConverter.ToUInt16(data, index);
|
||
|
|
case OVRGLTFComponentType.UNSIGNED_INT:
|
||
|
|
return BitConverter.ToUInt32(data, index);
|
||
|
|
default:
|
||
|
|
Debug.Log(String.Format("Failed to read Component Type {0} as a uint.", type));
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private float ReadElementAsFloat(byte[] data, int index)
|
||
|
|
{
|
||
|
|
return BitConverter.ToSingle(data, index);
|
||
|
|
}
|
||
|
|
}
|