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using Unity.Collections;
using Unity.Mathematics;
using UnityEngine;
namespace Pathfinding.Graphs.Navmesh {
/// <summary>
/// Represents a rectangular group of tiles of a recast graph.
///
/// This is a portable representation in that it can be serialized to and from a byte array.
///
/// <code>
/// // Scans the first 6x6 chunk of tiles of the recast graph (the IntRect uses inclusive coordinates)
/// var graph = AstarPath.active.data.recastGraph;
/// var buildSettings = RecastBuilder.BuildTileMeshes(graph, new TileLayout(graph), new IntRect(0, 0, 5, 5));
/// var disposeArena = new Pathfinding.Jobs.DisposeArena();
/// var promise = buildSettings.Schedule(disposeArena);
///
/// AstarPath.active.AddWorkItem(() => {
/// // Block until the asynchronous job completes
/// var result = promise.Complete();
/// TileMeshes tiles = result.tileMeshes.ToManaged();
/// // Take the scanned tiles and place them in the graph,
/// // but not at their original location, but 2 tiles away, rotated 90 degrees.
/// tiles.tileRect = tiles.tileRect.Offset(new Int2(2, 0));
/// tiles.Rotate(1);
/// graph.ReplaceTiles(tiles);
///
/// // Dispose unmanaged data
/// disposeArena.DisposeAll();
/// result.Dispose();
/// });
/// </code>
///
/// See: <see cref="NavmeshPrefab"/> uses this representation internally for storage.
/// See: <see cref="RecastGraph.ReplaceTiles"/>
/// See: <see cref="RecastBuilder.BuildTileMeshes"/>
/// </summary>
public struct TileMeshes {
/// <summary>Tiles laid out row by row</summary>
public TileMesh[] tileMeshes;
/// <summary>Which tiles in the graph this group of tiles represents</summary>
public IntRect tileRect;
/// <summary>World-space size of each tile</summary>
public Vector2 tileWorldSize;
/// <summary>Rotate this group of tiles by 90*N degrees clockwise about the group's center</summary>
public void Rotate (int rotation) {
rotation = -rotation;
// Get the positive remainder modulo 4. I.e. a number between 0 and 3.
rotation = ((rotation % 4) + 4) % 4;
if (rotation == 0) return;
var rot90 = new int2x2(0, -1, 1, 0);
var rotN = int2x2.identity;
for (int i = 0; i < rotation; i++) rotN = math.mul(rotN, rot90);
var tileSize = (Int3) new Vector3(tileWorldSize.x, 0, tileWorldSize.y);
var offset = -math.min(int2.zero, math.mul(rotN, new int2(tileSize.x, tileSize.z)));
var size = new int2(tileRect.Width, tileRect.Height);
var offsetTileCoordinate = -math.min(int2.zero, math.mul(rotN, size - 1));
var newTileMeshes = new TileMesh[tileMeshes.Length];
var newSize = (rotation % 2) == 0 ? size : new int2(size.y, size.x);
for (int z = 0; z < size.y; z++) {
for (int x = 0; x < size.x; x++) {
var vertices = tileMeshes[x + z*size.x].verticesInTileSpace;
for (int i = 0; i < vertices.Length; i++) {
var v = vertices[i];
var rotated = math.mul(rotN, new int2(v.x, v.z)) + offset;
vertices[i] = new Int3(rotated.x, v.y, rotated.y);
}
var tileCoord = math.mul(rotN, new int2(x, z)) + offsetTileCoordinate;
newTileMeshes[tileCoord.x + tileCoord.y*newSize.x] = tileMeshes[x + z*size.x];
}
}
tileMeshes = newTileMeshes;
tileWorldSize = rotation % 2 == 0 ? tileWorldSize : new Vector2(tileWorldSize.y, tileWorldSize.x);
tileRect = new IntRect(tileRect.xmin, tileRect.ymin, tileRect.xmin + newSize.x - 1, tileRect.ymin + newSize.y - 1);
}
/// <summary>
/// Serialize this struct to a portable byte array.
/// The data is compressed using the deflate algorithm to reduce size.
/// See: <see cref="Deserialize"/>
/// </summary>
public byte[] Serialize () {
var buffer = new System.IO.MemoryStream();
var writer = new System.IO.BinaryWriter(new System.IO.Compression.DeflateStream(buffer, System.IO.Compression.CompressionMode.Compress));
// Version
writer.Write(0);
writer.Write(tileRect.Width);
writer.Write(tileRect.Height);
writer.Write(this.tileWorldSize.x);
writer.Write(this.tileWorldSize.y);
for (int z = 0; z < tileRect.Height; z++) {
for (int x = 0; x < tileRect.Width; x++) {
var tile = tileMeshes[(z*tileRect.Width) + x];
UnityEngine.Assertions.Assert.IsTrue(tile.tags.Length*3 == tile.triangles.Length);
writer.Write(tile.triangles.Length);
writer.Write(tile.verticesInTileSpace.Length);
for (int i = 0; i < tile.verticesInTileSpace.Length; i++) {
var v = tile.verticesInTileSpace[i];
writer.Write(v.x);
writer.Write(v.y);
writer.Write(v.z);
}
for (int i = 0; i < tile.triangles.Length; i++) writer.Write(tile.triangles[i]);
for (int i = 0; i < tile.tags.Length; i++) writer.Write(tile.tags[i]);
}
}
writer.Close();
return buffer.ToArray();
}
/// <summary>
/// Deserialize an instance from a byte array.
/// See: <see cref="Serialize"/>
/// </summary>
public static TileMeshes Deserialize (byte[] bytes) {
var reader = new System.IO.BinaryReader(new System.IO.Compression.DeflateStream(new System.IO.MemoryStream(bytes), System.IO.Compression.CompressionMode.Decompress));
var version = reader.ReadInt32();
if (version != 0) throw new System.Exception("Invalid data. Unexpected version number.");
var w = reader.ReadInt32();
var h = reader.ReadInt32();
var tileSize = new Vector2(reader.ReadSingle(), reader.ReadSingle());
if (w < 0 || h < 0) throw new System.Exception("Invalid bounds");
var tileRect = new IntRect(0, 0, w - 1, h - 1);
var tileMeshes = new TileMesh[w*h];
for (int z = 0; z < h; z++) {
for (int x = 0; x < w; x++) {
int[] tris = new int[reader.ReadInt32()];
Int3[] vertsInTileSpace = new Int3[reader.ReadInt32()];
uint[] tags = new uint[tris.Length/3];
for (int i = 0; i < vertsInTileSpace.Length; i++) vertsInTileSpace[i] = new Int3(reader.ReadInt32(), reader.ReadInt32(), reader.ReadInt32());
for (int i = 0; i < tris.Length; i++) {
tris[i] = reader.ReadInt32();
UnityEngine.Assertions.Assert.IsTrue(tris[i] >= 0 && tris[i] < vertsInTileSpace.Length);
}
for (int i = 0; i < tags.Length; i++) tags[i] = reader.ReadUInt32();
tileMeshes[x + z*w] = new TileMesh {
triangles = tris,
verticesInTileSpace = vertsInTileSpace,
tags = tags,
};
}
}
return new TileMeshes {
tileMeshes = tileMeshes,
tileRect = tileRect,
tileWorldSize = tileSize,
};
}
}
/// <summary>Unsafe representation of a <see cref="TileMeshes"/> struct</summary>
public struct TileMeshesUnsafe {
public NativeArray<TileMesh.TileMeshUnsafe> tileMeshes;
public IntRect tileRect;
public Vector2 tileWorldSize;
public TileMeshesUnsafe(NativeArray<TileMesh.TileMeshUnsafe> tileMeshes, IntRect tileRect, Vector2 tileWorldSize) {
this.tileMeshes = tileMeshes;
this.tileRect = tileRect;
this.tileWorldSize = tileWorldSize;
}
/// <summary>Copies the native data to managed data arrays which are easier to work with</summary>
public TileMeshes ToManaged () {
var output = new TileMesh[tileMeshes.Length];
for (int i = 0; i < output.Length; i++) {
output[i] = tileMeshes[i].ToManaged();
}
return new TileMeshes {
tileMeshes = output,
tileRect = this.tileRect,
tileWorldSize = this.tileWorldSize,
};
}
public void Dispose () {
// Allows calling Dispose on zero-initialized instances
if (!tileMeshes.IsCreated) return;
for (int i = 0; i < tileMeshes.Length; i++) tileMeshes[i].Dispose();
tileMeshes.Dispose();
}
}
}
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