public WorldChunk GetChunk(Point chunkPosition)
{
if (_chunks.TryGetValue(chunkPosition, out var chunk))
{
return(chunk);
}
chunk = new WorldChunk(chunkPosition);
_chunks.Add(chunkPosition, chunk);
return(chunk);
}
public void UpdateChunk(WorldChunk worldChunk)
{
if (!worldChunk.IsDirty)
{
return;
}
if (_vertexBufferCache.TryGetValue(worldChunk.Position, out var worldChunkVertexBuffer))
{
worldChunkVertexBuffer.Dispose();
_vertexBufferCache.Remove(worldChunk.Position);
}
worldChunkVertexBuffer = BuildVertexBuffer(worldChunk);
_vertexBufferCache.Add(worldChunk.Position, worldChunkVertexBuffer);
}
private VertexBuffer BuildVertexBuffer(WorldChunk worldChunk)
{
var landVertices = new List <VertexPositionColorTexture>();
const int TileSize = 44;
const int TileSizeHalf = TileSize / 2;
void DrawSquare(int landId, int x, int y, float tileZ, float tileZEast, float tileZWest, float tileZSouth)
{
/*
* var tile = tileZ == 0
* ? _textureAtlas.GetLandTile(landId)
* : _textureAtlas.GetLandTextureTile(landId);
*/
/*
* var tile = tileZ != 0
* ? _textureAtlas.GetLandTile(landId)
* : _textureAtlas.GetLandTextureTile(landId);
*/
/* uncomment when atlas is in
* var p0 = new Vector3(x + TileSizeHalf, y - tileZ * 4, tile.Uvws.V1.W);
* var p1 = new Vector3(x + TileSize, y + TileSizeHalf - tileZEast * 4, tile.Uvws.V2.W);
* var p2 = new Vector3(x, y + TileSizeHalf - tileZWest * 4, tile.Uvws.V3.W);
* var p3 = new Vector3(x + TileSizeHalf, y + TileSize - tileZSouth * 4, tile.Uvws.V4.W);
*/
var p0 = new Vector3(x + TileSizeHalf, y - tileZ * 4, 0);
var p1 = new Vector3(x + TileSize, y + TileSizeHalf - tileZEast * 4, 0);
var p2 = new Vector3(x, y + TileSizeHalf - tileZWest * 4, 0);
var p3 = new Vector3(x + TileSizeHalf, y + TileSize - tileZSouth * 4, 0);
/* uncomment when atlas is in
* var uv0 = new Vector2(tile.Uvws.V1.U, tile.Uvws.V1.V);
* var uv1 = new Vector2(tile.Uvws.V2.U, tile.Uvws.V2.V);
* var uv2 = new Vector2(tile.Uvws.V3.U, tile.Uvws.V3.V);
* var uv3 = new Vector2(tile.Uvws.V4.U, tile.Uvws.V4.V);
*/
var uv0 = Vector2.Zero;
var uv1 = Vector2.Zero;
var uv2 = Vector2.Zero;
var uv3 = Vector2.Zero;
var n1 = Vector3.Cross(p2 - p0, p1 - p0);
landVertices.Add(new VertexPositionColorTexture(p0, Color.Red, uv0));
landVertices.Add(new VertexPositionColorTexture(p1, Color.Red, uv1));
landVertices.Add(new VertexPositionColorTexture(p2, Color.Red, uv2));
var n2 = Vector3.Cross(p2 - p3, p1 - p3);
landVertices.Add(new VertexPositionColorTexture(p1, Color.Black, uv1));
landVertices.Add(new VertexPositionColorTexture(p3, Color.Green, uv3));
landVertices.Add(new VertexPositionColorTexture(p2, Color.Black, uv2));
}
for (var x = 0; x < ChunkData.ChunkSize; ++x)
{
for (var y = 0; y < ChunkData.ChunkSize; ++y)
{
var staticTile = worldChunk.GetStaticTile(x, y);
var tileZ = worldChunk.GetZ(x, y);
var tileZEast = worldChunk.GetZ(x + 1, y);
var tileZWest = worldChunk.GetZ(x, y + 1);
var tileZSouth = worldChunk.GetZ(x + 1, y + 1);
DrawSquare(staticTile.TileId, (x - y) * TileSizeHalf, (x + y) * TileSizeHalf, tileZ, tileZEast, tileZWest, tileZSouth);
}
}
var vertexBuffer = new VertexBuffer(
_graphicsDevice,
typeof(VertexPositionColorTexture),
landVertices.Count,
BufferUsage.WriteOnly
);
vertexBuffer.SetData(landVertices.ToArray());
return(vertexBuffer);
}