void Start()
{
TilesToGenerate = new List <int>();
TileGeneratorMat = new Material(TileGenerator);
TileGeneratorMat.SetShaderPassEnabled("Always", false);
LayerCount = DemoTerrain.terrainData.terrainLayers.Length;
physicalTexture = (PhysicalTexture)GetComponent(typeof(PhysicalTexture));
pageTable = (PageTable)GetComponent(typeof(PageTable));
m_TilePool = new LruCache(pageTable.MaxMipLevel, physicalTexture.PhysicalTextureSize.x, physicalTexture.PhysicalTextureSize.y, physicalTexture, pageTable);
//TODO 更好的texture存储方式？？
TileGeneratorMat.SetTexture("_AlphaMap", DemoTerrain.terrainData.alphamapTextures[0]);
Vector4[] tileInfo = new Vector4[4];
for (int i = 0; i < LayerCount && i < 4; i++)
{
TerrainLayer currLayer = DemoTerrain.terrainData.terrainLayers[i];
currLayer.diffuseTexture.wrapMode = TextureWrapMode.Repeat;
currLayer.normalMapTexture.wrapMode = TextureWrapMode.Repeat;
currLayer.diffuseTexture.filterMode = FilterMode.Bilinear;
currLayer.normalMapTexture.filterMode = FilterMode.Bilinear;
TileGeneratorMat.SetTexture("_Diffuse" + i, currLayer.diffuseTexture);
TileGeneratorMat.SetTexture("_Normal" + i, currLayer.normalMapTexture);
tileInfo[i].x = currLayer.tileSize.x;
tileInfo[i].y = currLayer.tileSize.y;
tileInfo[i].w = currLayer.tileOffset.x;
tileInfo[i].z = currLayer.tileOffset.y;
}
TileGeneratorMat.SetVector("_TerrainSize", DemoTerrain.terrainData.size);
TileGeneratorMat.SetVectorArray("_TileInfo", tileInfo);
}