949 lines
36 KiB
C#
949 lines
36 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Freely adapted from the Aurora version of the terrain compressor.
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* Copyright (c) Contributors, http://aurora-sim.org/, http://opensimulator.org/
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*/
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using System;
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using System.Reflection;
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using log4net;
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using OpenSim.Framework;
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using OpenSim.Region.Framework;
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using OpenSim.Region.Framework.Scenes;
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using OpenMetaverse;
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using OpenMetaverse.Packets;
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namespace OpenSim.Region.ClientStack.LindenUDP
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{
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public static class OpenSimTerrainCompressor
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{
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// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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#pragma warning disable 414
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private static string LogHeader = "[TERRAIN COMPRESSOR]";
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#pragma warning restore 414
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public const int END_OF_PATCHES = 97;
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private const float OO_SQRT2 = 0.7071067811865475244008443621049f;
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private const int STRIDE = 264;
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private const int ZERO_CODE = 0x0;
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private const int ZERO_EOB = 0x2;
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private const int POSITIVE_VALUE = 0x6;
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private const int NEGATIVE_VALUE = 0x7;
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private static readonly float[] DequantizeTable16 =
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new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
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private static readonly float[] DequantizeTable32 =
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new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
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private static readonly float[] CosineTable16 = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
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//private static readonly float[] CosineTable32 = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
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private static readonly int[] CopyMatrix16 = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
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private static readonly int[] CopyMatrix32 = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
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private static readonly float[] QuantizeTable16 =
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new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
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static OpenSimTerrainCompressor()
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{
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// Initialize the decompression tables
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BuildDequantizeTable16();
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SetupCosines16();
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BuildCopyMatrix16();
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BuildQuantizeTable16();
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}
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// Used to send cloud and wind patches
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public static LayerDataPacket CreateLayerDataPacket(TerrainPatch[] patches, byte type, int pRegionSizeX,
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int pRegionSizeY)
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{
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LayerDataPacket layer = new LayerDataPacket {LayerID = {Type = type}};
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TerrainPatch.GroupHeader header = new TerrainPatch.GroupHeader
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{Stride = STRIDE, PatchSize = Constants.TerrainPatchSize};
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// Should be enough to fit even the most poorly packed data
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byte[] data = new byte[patches.Length*Constants.TerrainPatchSize*Constants.TerrainPatchSize*2];
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BitPack bitpack = new BitPack(data, 0);
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bitpack.PackBits(header.Stride, 16);
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bitpack.PackBits(header.PatchSize, 8);
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bitpack.PackBits(type, 8);
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foreach (TerrainPatch t in patches)
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CreatePatch(bitpack, t.Data, t.X, t.Y, pRegionSizeX, pRegionSizeY);
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bitpack.PackBits(END_OF_PATCHES, 8);
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layer.LayerData.Data = new byte[bitpack.BytePos + 1];
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Buffer.BlockCopy(bitpack.Data, 0, layer.LayerData.Data, 0, bitpack.BytePos + 1);
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return layer;
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}
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// Create a land packet for a single patch.
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public static LayerDataPacket CreateLandPacket(TerrainData terrData, int patchX, int patchY)
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{
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int[] xPieces = new int[1];
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int[] yPieces = new int[1];
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xPieces[0] = patchX; // patch X dimension
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yPieces[0] = patchY;
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return CreateLandPacket(terrData, xPieces, yPieces);
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}
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public static LayerDataPacket CreateLandPacket(TerrainData terrData, int[] xPieces, int[] yPieces)
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{
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byte landPacketType = (byte)TerrainPatch.LayerType.Land;
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if (terrData.SizeX > Constants.RegionSize || terrData.SizeY > Constants.RegionSize)
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{
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landPacketType = (byte)TerrainPatch.LayerType.LandExtended;
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}
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return CreateLandPacket(terrData, xPieces, yPieces, landPacketType);
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}
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/// <summary>
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/// Creates a LayerData packet for compressed land data given a full
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/// simulator heightmap and an array of indices of patches to compress
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/// </summary>
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/// <param name="terrData">
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/// Terrain data that can result in a meter square heightmap.
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/// </param>
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/// <param name="x">
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/// Array of indexes in the grid of patches
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/// for this simulator.
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/// If creating a packet for multiple patches, there will be entries in
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/// both the X and Y arrays for each of the patches.
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/// For example if patches 1 and 17 are to be sent,
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/// x[] = {1,1} and y[] = {0,1} which specifies the patches at
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/// indexes <1,0> and <1,1> (presuming the terrain size is 16x16 patches).
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/// </param>
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/// <param name="y">
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/// Array of indexes in the grid of patches.
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/// </param>
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/// <param name="type"></param>
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/// <returns></returns>
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public static LayerDataPacket CreateLandPacket(TerrainData terrData, int[] x, int[] y, byte type)
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{
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LayerDataPacket layer = new LayerDataPacket {LayerID = {Type = type}};
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TerrainPatch.GroupHeader header = new TerrainPatch.GroupHeader
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{Stride = STRIDE, PatchSize = Constants.TerrainPatchSize};
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byte[] data = new byte[x.Length * Constants.TerrainPatchSize * Constants.TerrainPatchSize * 2];
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BitPack bitpack = new BitPack(data, 0);
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bitpack.PackBits(header.Stride, 16);
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bitpack.PackBits(header.PatchSize, 8);
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bitpack.PackBits(type, 8);
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for (int i = 0; i < x.Length; i++)
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CreatePatchFromHeightmap(bitpack, terrData, x[i], y[i]);
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bitpack.PackBits(END_OF_PATCHES, 8);
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layer.LayerData.Data = new byte[bitpack.BytePos + 1];
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Buffer.BlockCopy(bitpack.Data, 0, layer.LayerData.Data, 0, bitpack.BytePos + 1);
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return layer;
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}
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// Unused: left for historical reference.
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public static void CreatePatch(BitPack output, float[] patchData, int x, int y, int pRegionSizeX, int pRegionSizeY)
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{
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TerrainPatch.Header header = PrescanPatch(patchData);
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header.QuantWBits = 136;
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if (pRegionSizeX > Constants.RegionSize || pRegionSizeY > Constants.RegionSize)
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{
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header.PatchIDs = (y & 0xFFFF);
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header.PatchIDs += (x << 16);
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}
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else
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{
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header.PatchIDs = (y & 0x1F);
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header.PatchIDs += (x << 5);
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}
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// NOTE: No idea what prequant and postquant should be or what they do
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int wbits;
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int[] patch = CompressPatch(patchData, header, 10, out wbits);
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wbits = EncodePatchHeader(output, header, patch, Constants.RegionSize, Constants.RegionSize, wbits);
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EncodePatch(output, patch, 0, wbits);
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}
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/// <summary>
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/// Add a patch of terrain to a BitPacker
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/// </summary>
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/// <param name="output">BitPacker to write the patch to</param>
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/// <param name="heightmap">
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/// Heightmap of the simulator. Presumed to be an sizeX*sizeY array.
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/// </param>
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/// <param name="patchX">
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/// X offset of the patch to create.
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/// </param>
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/// <param name="patchY">
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/// Y offset of the patch to create.
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/// </param>
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/// <param name="pRegionSizeX"></param>
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/// <param name="pRegionSizeY"></param>
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public static void CreatePatchFromHeightmap(BitPack output, TerrainData terrData, int patchX, int patchY)
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{
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TerrainPatch.Header header = PrescanPatch(terrData, patchX, patchY);
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header.QuantWBits = 136;
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// If larger than legacy region size, pack patch X and Y info differently.
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if (terrData.SizeX > Constants.RegionSize || terrData.SizeY > Constants.RegionSize)
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{
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header.PatchIDs = (patchY & 0xFFFF);
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header.PatchIDs += (patchX << 16);
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}
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else
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{
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header.PatchIDs = (patchY & 0x1F);
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header.PatchIDs += (patchX << 5);
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}
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// m_log.DebugFormat("{0} CreatePatchFromHeightmap. patchX={1}, patchY={2}, DCOffset={3}, range={4}",
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// LogHeader, patchX, patchY, header.DCOffset, header.Range);
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// NOTE: No idea what prequant and postquant should be or what they do
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int wbits;
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int[] patch = CompressPatch(terrData, patchX, patchY, header, 10, out wbits);
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wbits = EncodePatchHeader(output, header, patch, (uint)terrData.SizeX, (uint)terrData.SizeY, wbits);
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EncodePatch(output, patch, 0, wbits);
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}
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private static TerrainPatch.Header PrescanPatch(float[] patch)
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{
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TerrainPatch.Header header = new TerrainPatch.Header();
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float zmax = -99999999.0f;
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float zmin = 99999999.0f;
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for (int i = 0; i < Constants.TerrainPatchSize*Constants.TerrainPatchSize; i++)
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{
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float val = patch[i];
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if (val > zmax) zmax = val;
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if (val < zmin) zmin = val;
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}
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header.DCOffset = zmin;
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header.Range = (int) ((zmax - zmin) + 1.0f);
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return header;
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}
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// Scan the height info we're returning and return a patch packet header for this patch.
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private static TerrainPatch.Header PrescanPatch(TerrainData terrData, int patchX, int patchY)
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{
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TerrainPatch.Header header = new TerrainPatch.Header();
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float zmax = -99999999.0f;
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float zmin = 99999999.0f;
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for (int j = patchY*Constants.TerrainPatchSize; j < (patchY + 1)*Constants.TerrainPatchSize; j++)
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{
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for (int i = patchX*Constants.TerrainPatchSize; i < (patchX + 1)*Constants.TerrainPatchSize; i++)
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{
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float val = terrData[i, j];
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if (val > zmax) zmax = val;
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if (val < zmin) zmin = val;
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}
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}
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header.DCOffset = zmin;
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header.Range = (int)((zmax - zmin) + 1.0f);
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return header;
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}
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public static TerrainPatch.Header DecodePatchHeader(BitPack bitpack)
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{
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TerrainPatch.Header header = new TerrainPatch.Header {QuantWBits = bitpack.UnpackBits(8)};
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// Quantized word bits
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if (header.QuantWBits == END_OF_PATCHES)
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return header;
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// DC offset
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header.DCOffset = bitpack.UnpackFloat();
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// Range
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header.Range = bitpack.UnpackBits(16);
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// Patch IDs (10 bits)
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header.PatchIDs = bitpack.UnpackBits(10);
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// Word bits
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header.WordBits = (uint) ((header.QuantWBits & 0x0f) + 2);
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return header;
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}
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private static int EncodePatchHeader(BitPack output, TerrainPatch.Header header, int[] patch, uint pRegionSizeX,
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uint pRegionSizeY, int wbits)
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{
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/*
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int temp;
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int wbits = (header.QuantWBits & 0x0f) + 2;
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uint maxWbits = (uint)wbits + 5;
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uint minWbits = ((uint)wbits >> 1);
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int wbitsMaxValue;
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*/
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// goal is to determ minimum number of bits to use so all data fits
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/*
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wbits = (int)minWbits;
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wbitsMaxValue = (1 << wbits);
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for (int i = 0; i < patch.Length; i++)
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{
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temp = patch[i];
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if (temp != 0)
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{
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// Get the absolute value
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if (temp < 0) temp *= -1;
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no coments..
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for (int j = (int)maxWbits; j > (int)minWbits; j--)
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{
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if ((temp & (1 << j)) != 0)
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{
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if (j > wbits) wbits = j;
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break;
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}
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}
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while (temp > wbitsMaxValue)
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{
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wbits++;
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if (wbits == maxWbits)
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goto Done;
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wbitsMaxValue = 1 << wbits;
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}
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}
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}
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Done:
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// wbits += 1;
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*/
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// better check
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if (wbits > 17)
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wbits = 16;
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else if (wbits < 3)
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wbits = 3;
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header.QuantWBits &= 0xf0;
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header.QuantWBits |= (wbits - 2);
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output.PackBits(header.QuantWBits, 8);
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output.PackFloat(header.DCOffset);
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output.PackBits(header.Range, 16);
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if (pRegionSizeX > Constants.RegionSize || pRegionSizeY > Constants.RegionSize)
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output.PackBits(header.PatchIDs, 32);
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else
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output.PackBits(header.PatchIDs, 10);
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return wbits;
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}
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private static void IDCTColumn16(float[] linein, float[] lineout, int column)
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{
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for (int n = 0; n < Constants.TerrainPatchSize; n++)
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{
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float total = OO_SQRT2*linein[column];
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for (int u = 1; u < Constants.TerrainPatchSize; u++)
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{
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int usize = u*Constants.TerrainPatchSize;
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total += linein[usize + column]*CosineTable16[usize + n];
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}
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lineout[Constants.TerrainPatchSize*n + column] = total;
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}
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}
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private static void IDCTLine16(float[] linein, float[] lineout, int line)
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{
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const float oosob = 2.0f/Constants.TerrainPatchSize;
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int lineSize = line*Constants.TerrainPatchSize;
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for (int n = 0; n < Constants.TerrainPatchSize; n++)
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{
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float total = OO_SQRT2*linein[lineSize];
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for (int u = 1; u < Constants.TerrainPatchSize; u++)
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{
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total += linein[lineSize + u]*CosineTable16[u*Constants.TerrainPatchSize + n];
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}
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lineout[lineSize + n] = total*oosob;
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}
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}
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/*
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private static void DCTLine16(float[] linein, float[] lineout, int line)
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{
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float total = 0.0f;
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int lineSize = line * Constants.TerrainPatchSize;
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for (int n = 0; n < Constants.TerrainPatchSize; n++)
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{
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total += linein[lineSize + n];
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}
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lineout[lineSize] = OO_SQRT2 * total;
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int uptr = 0;
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for (int u = 1; u < Constants.TerrainPatchSize; u++)
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{
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total = 0.0f;
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uptr += Constants.TerrainPatchSize;
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for (int n = 0; n < Constants.TerrainPatchSize; n++)
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{
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total += linein[lineSize + n] * CosineTable16[uptr + n];
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}
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lineout[lineSize + u] = total;
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}
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}
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*/
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private static void DCTLine16(float[] linein, float[] lineout, int line)
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{
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// outputs transpose data (lines exchanged with coluns )
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// so to save a bit of cpu when doing coluns
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float total = 0.0f;
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int lineSize = line*Constants.TerrainPatchSize;
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for (int n = 0; n < Constants.TerrainPatchSize; n++)
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{
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total += linein[lineSize + n];
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}
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lineout[line] = OO_SQRT2*total;
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for (int u = Constants.TerrainPatchSize;
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u < Constants.TerrainPatchSize*Constants.TerrainPatchSize;
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u += Constants.TerrainPatchSize)
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{
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total = 0.0f;
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for (int ptrn = lineSize, ptru = u; ptrn < lineSize + Constants.TerrainPatchSize; ptrn++,ptru++)
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{
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total += linein[ptrn]*CosineTable16[ptru];
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}
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lineout[line + u] = total;
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}
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}
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/*
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private static void DCTColumn16(float[] linein, int[] lineout, int column)
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{
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float total = 0.0f;
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// const float oosob = 2.0f / Constants.TerrainPatchSize;
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for (int n = 0; n < Constants.TerrainPatchSize; n++)
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{
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total += linein[Constants.TerrainPatchSize * n + column];
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}
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// lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * oosob * QuantizeTable16[column]);
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lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * QuantizeTable16[column]);
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for (int uptr = Constants.TerrainPatchSize; uptr < Constants.TerrainPatchSize * Constants.TerrainPatchSize; uptr += Constants.TerrainPatchSize)
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{
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total = 0.0f;
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for (int n = 0; n < Constants.TerrainPatchSize; n++)
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{
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total += linein[Constants.TerrainPatchSize * n + column] * CosineTable16[uptr + n];
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}
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|
|
// lineout[CopyMatrix16[Constants.TerrainPatchSize * u + column]] = (int)(total * oosob * QuantizeTable16[Constants.TerrainPatchSize * u + column]);
|
|
lineout[CopyMatrix16[uptr + column]] = (int)(total * QuantizeTable16[uptr + column]);
|
|
}
|
|
}
|
|
|
|
private static void DCTColumn16(float[] linein, int[] lineout, int column)
|
|
{
|
|
// input columns are in fact stored in lines now
|
|
|
|
float total = 0.0f;
|
|
// const float oosob = 2.0f / Constants.TerrainPatchSize;
|
|
int inlinesptr = Constants.TerrainPatchSize*column;
|
|
|
|
for (int n = 0; n < Constants.TerrainPatchSize; n++)
|
|
{
|
|
total += linein[inlinesptr + n];
|
|
}
|
|
|
|
// lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * oosob * QuantizeTable16[column]);
|
|
lineout[CopyMatrix16[column]] = (int) (OO_SQRT2*total*QuantizeTable16[column]);
|
|
|
|
for (int uptr = Constants.TerrainPatchSize;
|
|
uptr < Constants.TerrainPatchSize*Constants.TerrainPatchSize;
|
|
uptr += Constants.TerrainPatchSize)
|
|
{
|
|
total = 0.0f;
|
|
|
|
for (int n = inlinesptr, ptru = uptr; n < inlinesptr + Constants.TerrainPatchSize; n++, ptru++)
|
|
{
|
|
total += linein[n]*CosineTable16[ptru];
|
|
}
|
|
|
|
// lineout[CopyMatrix16[Constants.TerrainPatchSize * u + column]] = (int)(total * oosob * QuantizeTable16[Constants.TerrainPatchSize * u + column]);
|
|
lineout[CopyMatrix16[uptr + column]] = (int) (total*QuantizeTable16[uptr + column]);
|
|
}
|
|
}
|
|
*/
|
|
|
|
private static int DCTColumn16Wbits(float[] linein, int[] lineout, int column, int wbits, int maxwbits)
|
|
{
|
|
// input columns are in fact stored in lines now
|
|
|
|
bool dowbits = wbits != maxwbits;
|
|
int wbitsMaxValue = 1 << wbits;
|
|
|
|
float total = 0.0f;
|
|
// const float oosob = 2.0f / Constants.TerrainPatchSize;
|
|
int inlinesptr = Constants.TerrainPatchSize*column;
|
|
|
|
for (int n = 0; n < Constants.TerrainPatchSize; n++)
|
|
{
|
|
total += linein[inlinesptr + n];
|
|
}
|
|
|
|
// lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * oosob * QuantizeTable16[column]);
|
|
int tmp = (int) (OO_SQRT2*total*QuantizeTable16[column]);
|
|
lineout[CopyMatrix16[column]] = tmp;
|
|
|
|
if (dowbits)
|
|
{
|
|
if (tmp < 0) tmp *= -1;
|
|
while (tmp > wbitsMaxValue)
|
|
{
|
|
wbits++;
|
|
wbitsMaxValue = 1 << wbits;
|
|
if (wbits == maxwbits)
|
|
{
|
|
dowbits = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (int uptr = Constants.TerrainPatchSize;
|
|
uptr < Constants.TerrainPatchSize*Constants.TerrainPatchSize;
|
|
uptr += Constants.TerrainPatchSize)
|
|
{
|
|
total = 0.0f;
|
|
|
|
for (int n = inlinesptr, ptru = uptr; n < inlinesptr + Constants.TerrainPatchSize; n++, ptru++)
|
|
{
|
|
total += linein[n]*CosineTable16[ptru];
|
|
}
|
|
|
|
tmp = (int) (total*QuantizeTable16[uptr + column]);
|
|
lineout[CopyMatrix16[uptr + column]] = tmp;
|
|
|
|
if (dowbits)
|
|
{
|
|
if (tmp < 0) tmp *= -1;
|
|
while (tmp > wbitsMaxValue)
|
|
{
|
|
wbits++;
|
|
wbitsMaxValue = 1 << wbits;
|
|
if (wbits == maxwbits)
|
|
{
|
|
dowbits = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return wbits;
|
|
}
|
|
|
|
public static void DecodePatch(int[] patches, BitPack bitpack, TerrainPatch.Header header, int size)
|
|
{
|
|
for (int n = 0; n < size*size; n++)
|
|
{
|
|
// ?
|
|
int temp = bitpack.UnpackBits(1);
|
|
if (temp != 0)
|
|
{
|
|
// Value or EOB
|
|
temp = bitpack.UnpackBits(1);
|
|
if (temp != 0)
|
|
{
|
|
// Value
|
|
temp = bitpack.UnpackBits(1);
|
|
if (temp != 0)
|
|
{
|
|
// Negative
|
|
temp = bitpack.UnpackBits((int) header.WordBits);
|
|
patches[n] = temp*-1;
|
|
}
|
|
else
|
|
{
|
|
// Positive
|
|
temp = bitpack.UnpackBits((int) header.WordBits);
|
|
patches[n] = temp;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Set the rest to zero
|
|
// TODO: This might not be necessary
|
|
for (int o = n; o < size*size; o++)
|
|
{
|
|
patches[o] = 0;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
patches[n] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void EncodePatch(BitPack output, int[] patch, int postquant, int wbits)
|
|
{
|
|
int maxwbitssize = (1 << wbits) - 1;
|
|
|
|
if (postquant > Constants.TerrainPatchSize*Constants.TerrainPatchSize || postquant < 0)
|
|
{
|
|
Logger.Log("Postquant is outside the range of allowed values in EncodePatch()", Helpers.LogLevel.Error);
|
|
return;
|
|
}
|
|
|
|
if (postquant != 0) patch[Constants.TerrainPatchSize*Constants.TerrainPatchSize - postquant] = 0;
|
|
|
|
for (int i = 0; i < Constants.TerrainPatchSize*Constants.TerrainPatchSize; i++)
|
|
{
|
|
int temp = patch[i];
|
|
|
|
if (temp == 0)
|
|
{
|
|
bool eob = true;
|
|
|
|
for (int j = i; j < Constants.TerrainPatchSize*Constants.TerrainPatchSize - postquant; j++)
|
|
{
|
|
if (patch[j] != 0)
|
|
{
|
|
eob = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (eob)
|
|
{
|
|
output.PackBits(ZERO_EOB, 2);
|
|
return;
|
|
}
|
|
output.PackBits(ZERO_CODE, 1);
|
|
}
|
|
else
|
|
{
|
|
if (temp < 0)
|
|
{
|
|
temp *= -1;
|
|
|
|
if (temp > maxwbitssize) temp = maxwbitssize;
|
|
|
|
output.PackBits(NEGATIVE_VALUE, 3);
|
|
output.PackBits(temp, wbits);
|
|
}
|
|
else
|
|
{
|
|
if (temp > maxwbitssize) temp = maxwbitssize;
|
|
|
|
output.PackBits(POSITIVE_VALUE, 3);
|
|
output.PackBits(temp, wbits);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public static float[] DecompressPatch(int[] patches, TerrainPatch.Header header, TerrainPatch.GroupHeader group)
|
|
{
|
|
float[] block = new float[group.PatchSize*group.PatchSize];
|
|
float[] output = new float[group.PatchSize*group.PatchSize];
|
|
int prequant = (header.QuantWBits >> 4) + 2;
|
|
int quantize = 1 << prequant;
|
|
float ooq = 1.0f/quantize;
|
|
float mult = ooq*header.Range;
|
|
float addval = mult*(1 << (prequant - 1)) + header.DCOffset;
|
|
|
|
if (group.PatchSize == Constants.TerrainPatchSize)
|
|
{
|
|
for (int n = 0; n < Constants.TerrainPatchSize*Constants.TerrainPatchSize; n++)
|
|
{
|
|
block[n] = patches[CopyMatrix16[n]]*DequantizeTable16[n];
|
|
}
|
|
|
|
float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
IDCTColumn16(block, ftemp, o);
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
IDCTLine16(ftemp, block, o);
|
|
}
|
|
else
|
|
{
|
|
for (int n = 0; n < Constants.TerrainPatchSize*2*Constants.TerrainPatchSize*2; n++)
|
|
{
|
|
block[n] = patches[CopyMatrix32[n]]*DequantizeTable32[n];
|
|
}
|
|
|
|
Logger.Log("Implement IDCTPatchLarge", Helpers.LogLevel.Error);
|
|
}
|
|
|
|
for (int j = 0; j < block.Length; j++)
|
|
{
|
|
output[j] = block[j]*mult + addval;
|
|
}
|
|
|
|
return output;
|
|
}
|
|
|
|
private static int[] CompressPatch(float[] patchData, TerrainPatch.Header header, int prequant, out int wbits)
|
|
{
|
|
float[] block = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
int wordsize = (prequant - 2) & 0x0f;
|
|
float oozrange = 1.0f/header.Range;
|
|
float range = (1 << prequant);
|
|
float premult = oozrange*range;
|
|
float sub = (1 << (prequant - 1)) + header.DCOffset*premult;
|
|
|
|
header.QuantWBits = wordsize;
|
|
header.QuantWBits |= wordsize << 4;
|
|
|
|
int k = 0;
|
|
for (int j = 0; j < Constants.TerrainPatchSize; j++)
|
|
{
|
|
for (int i = 0; i < Constants.TerrainPatchSize; i++)
|
|
block[k++] = patchData[j*Constants.TerrainPatchSize + i]*premult - sub;
|
|
}
|
|
|
|
float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
int[] itemp = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
|
|
|
|
int maxWbits = prequant + 5;
|
|
wbits = (prequant >> 1);
|
|
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
DCTLine16(block, ftemp, o);
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
wbits = DCTColumn16Wbits(ftemp, itemp, o, wbits, maxWbits);
|
|
|
|
return itemp;
|
|
}
|
|
|
|
private static int[] CompressPatch(float[,] patchData, TerrainPatch.Header header, int prequant, out int wbits)
|
|
{
|
|
float[] block = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
float oozrange = 1.0f/header.Range;
|
|
float range = (1 << prequant);
|
|
float premult = oozrange*range;
|
|
float sub = (1 << (prequant - 1)) + header.DCOffset*premult;
|
|
int wordsize = (prequant - 2) & 0x0f;
|
|
|
|
header.QuantWBits = wordsize;
|
|
header.QuantWBits |= wordsize << 4;
|
|
|
|
int k = 0;
|
|
for (int j = 0; j < Constants.TerrainPatchSize; j++)
|
|
{
|
|
for (int i = 0; i < Constants.TerrainPatchSize; i++)
|
|
block[k++] = patchData[j, i]*premult - sub;
|
|
}
|
|
|
|
float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
int[] itemp = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
|
|
int maxWbits = prequant + 5;
|
|
wbits = (prequant >> 1);
|
|
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
DCTLine16(block, ftemp, o);
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
wbits = DCTColumn16Wbits(ftemp, itemp, o, wbits, maxWbits);
|
|
|
|
return itemp;
|
|
}
|
|
|
|
private static int[] CompressPatch(TerrainData terrData, int patchX, int patchY, TerrainPatch.Header header,
|
|
int prequant, out int wbits)
|
|
{
|
|
float[] block = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
int wordsize = prequant;
|
|
float oozrange = 1.0f/header.Range;
|
|
float range = (1 << prequant);
|
|
float premult = oozrange*range;
|
|
float sub = (1 << (prequant - 1)) + header.DCOffset*premult;
|
|
|
|
header.QuantWBits = wordsize - 2;
|
|
header.QuantWBits |= (prequant - 2) << 4;
|
|
|
|
int k = 0;
|
|
|
|
int yPatchLimit = patchY >= (terrData.SizeY / Constants.TerrainPatchSize) ?
|
|
(terrData.SizeY - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchY;
|
|
yPatchLimit = (yPatchLimit + 1) * Constants.TerrainPatchSize;
|
|
|
|
int xPatchLimit = patchX >= (terrData.SizeX / Constants.TerrainPatchSize) ?
|
|
(terrData.SizeX - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchX;
|
|
xPatchLimit = (xPatchLimit + 1) * Constants.TerrainPatchSize;
|
|
|
|
for (int yy = patchY * Constants.TerrainPatchSize; yy < yPatchLimit; yy++)
|
|
{
|
|
for (int xx = patchX * Constants.TerrainPatchSize; xx < xPatchLimit; xx++)
|
|
{
|
|
block[k++] = terrData[xx, yy] * premult - sub;
|
|
}
|
|
}
|
|
|
|
float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
int[] itemp = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
|
|
|
|
int maxWbits = prequant + 5;
|
|
wbits = (prequant >> 1);
|
|
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
DCTLine16(block, ftemp, o);
|
|
for (int o = 0; o < Constants.TerrainPatchSize; o++)
|
|
wbits = DCTColumn16Wbits(ftemp, itemp, o, wbits, maxWbits);
|
|
|
|
return itemp;
|
|
}
|
|
|
|
#region Initialization
|
|
|
|
private static void BuildDequantizeTable16()
|
|
{
|
|
for (int j = 0; j < Constants.TerrainPatchSize; j++)
|
|
{
|
|
for (int i = 0; i < Constants.TerrainPatchSize; i++)
|
|
{
|
|
DequantizeTable16[j*Constants.TerrainPatchSize + i] = 1.0f + 2.0f*(i + j);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void BuildQuantizeTable16()
|
|
{
|
|
const float oosob = 2.0f/Constants.TerrainPatchSize;
|
|
for (int j = 0; j < Constants.TerrainPatchSize; j++)
|
|
{
|
|
for (int i = 0; i < Constants.TerrainPatchSize; i++)
|
|
{
|
|
// QuantizeTable16[j * Constants.TerrainPatchSize + i] = 1.0f / (1.0f + 2.0f * ((float)i + (float)j));
|
|
QuantizeTable16[j*Constants.TerrainPatchSize + i] = oosob/(1.0f + 2.0f*(i + (float) j));
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void SetupCosines16()
|
|
{
|
|
const float hposz = (float) Math.PI*0.5f/Constants.TerrainPatchSize;
|
|
|
|
for (int u = 0; u < Constants.TerrainPatchSize; u++)
|
|
{
|
|
for (int n = 0; n < Constants.TerrainPatchSize; n++)
|
|
{
|
|
CosineTable16[u*Constants.TerrainPatchSize + n] = (float) Math.Cos((2.0f*n + 1.0f)*u*hposz);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void BuildCopyMatrix16()
|
|
{
|
|
bool diag = false;
|
|
bool right = true;
|
|
int i = 0;
|
|
int j = 0;
|
|
int count = 0;
|
|
|
|
while (i < Constants.TerrainPatchSize && j < Constants.TerrainPatchSize)
|
|
{
|
|
CopyMatrix16[j*Constants.TerrainPatchSize + i] = count++;
|
|
|
|
if (!diag)
|
|
{
|
|
if (right)
|
|
{
|
|
if (i < Constants.TerrainPatchSize - 1) i++;
|
|
else j++;
|
|
|
|
right = false;
|
|
diag = true;
|
|
}
|
|
else
|
|
{
|
|
if (j < Constants.TerrainPatchSize - 1) j++;
|
|
else i++;
|
|
|
|
right = true;
|
|
diag = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (right)
|
|
{
|
|
i++;
|
|
j--;
|
|
if (i == Constants.TerrainPatchSize - 1 || j == 0) diag = false;
|
|
}
|
|
else
|
|
{
|
|
i--;
|
|
j++;
|
|
if (j == Constants.TerrainPatchSize - 1 || i == 0) diag = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endregion Initialization
|
|
}
|
|
}
|