WaterFlush/Assets/AIPagedLod/Scripts/Loader/OsgbFileLoader.cs

/*************************************************************************
 *  Copyright © 2018-2023 Liwen All rights reserved.
 *------------------------------------------------------------------------
 *  File         :  OsgbFileLoader.cs
 *  Description  :  load osgb format tile info 
 *------------------------------------------------------------------------
 *  Author       :  Liwen
 *  Version      :  1.0.0
 *  Date         :  1/5/2019
 *  Description  :  Initial development version.
 *************************************************************************/

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Runtime.InteropServices;
using System.Linq;
using System.IO;
namespace AIPagedLod
{
    [System.Serializable]
    public class PagedLodRangeInfo
    {
        public float mSelfMinValue;
        public float mSelfMaxValue;
        public float mChildMinValue;
        public float mChildMaxValue;
    }

    public class OsgbFileLoader : PagedLodFileLoader
    {
        public List<string> mChildFiles = new List<string>();
        public List<PagedLodRangeInfo> mChildRangeValues = new List<PagedLodRangeInfo>();
        public float mBoundRadius;
        public Vector3 mBoundsCenter = Vector3.zero;
        public Vector3 mBoundsBoxMin = Vector3.zero;
        public Vector3 mBoundsBoxMax = Vector3.zero;

        public OsgbFileLoader(string fileName)
        {
            mFileName = fileName;
        }

        public override void LoadObjectMeshInfo()
        {
            IntPtr ptr = OsgbLoader.OpenOsgbFile(mFileName);
            if (ptr == IntPtr.Zero)
            {
                Debug.LogError("OpenOsgbFile failure " + mFileName);
                return;
            }
            int meshCount = OsgbLoader.GetMeshCount(ptr);
            for (int i = 0; i < meshCount; ++i)
            {
                TileObjectInfo info = new TileObjectInfo();
                info.mVertices = OsgbLoader.GetVertexs(ptr, i,mIsDaJiangData);
                info.mTriangles = OsgbLoader.GetTriangles(ptr, i, mIsDaJiangData);
                info.mTexCoords = OsgbLoader.GetTexCoords(ptr, i);
                info.mImageResolutionS = OsgbLoader.GetImageResolutionS(ptr, i);
                info.mImageResolutionT = OsgbLoader.GetImageResolutionT(ptr, i);
                info.mImageData = OsgbLoader.GetImageData(ptr, i);
                info.mTextureFormat = OsgbLoader.GetImageFormat(ptr, i);
                info.mUnityTextureFormat = TextureFormat.RGB24;
                if (info.mTextureFormat == 33779)
                {
                    info.mUnityTextureFormat = TextureFormat.DXT5;
                }
                mObjectInfoList.Add(info);
            }

            OsgbLoader.CloseOsgbFile(ptr);         
        }

        public override void LoadObjectBasicInfo()
        {
            IntPtr ptr = OsgbLoader.OpenOsgbFileEx(mFileName);
            if (ptr == IntPtr.Zero)
            {
                Debug.LogError("OpenOsgbFile failure " + mFileName);
                return;
            }
            int childCount = OsgbLoader.GetChildFileCount(ptr);
            for (int i = 0; i < childCount; ++i)
            {
                mChildFiles.Add(OsgbLoader.GetChildTileFile(ptr, i));
                float[] rangeValues = new float[4];
                OsgbLoader.GetRangeList(ptr, i, ref rangeValues[0]);
                PagedLodRangeInfo rangeInfo = new PagedLodRangeInfo();
                rangeInfo.mSelfMinValue = rangeValues[0];
                rangeInfo.mSelfMaxValue = rangeValues[1];
                rangeInfo.mChildMinValue = rangeValues[2];
                rangeInfo.mChildMaxValue = rangeValues[3];
                mChildRangeValues.Add(rangeInfo);
            }
            if (childCount > 0)
            {
                mBoundRadius = OsgbLoader.GetBoundRadius(ptr);
                float[] center = new float[3];
                float[] min = new float[3];
                float[] max = new float[3];
                OsgbLoader.GetBoundsBox(ptr, ref center[0], ref min[0], ref max[0]);
                mBoundsCenter = new Vector3(center[0], -center[1], -center[2]);  //局部坐标
                mBoundsBoxMin = new Vector3(min[0], -min[1], min[2]);          //局部坐标
                mBoundsBoxMax = new Vector3(max[0], -max[1], max[2]);          //局部坐标
            }
            OsgbLoader.CloseOsgbFile(ptr);
        }

       
    }
}