public void Render(Grid.GridRange range, Rectangle viewport)
{
// 1. Remove previous tiles.
////
foreach (var cellList in visibleCells.Values)
{
cellList.Clear();
}
// 1. Fill
////
foreach (Grid.GridCell cell in range)
{
if (cell.Data == null)
{
continue;
}
BlobImage image = cell.Data.Floor.Image;
if (!visibleCells.ContainsKey(image))
{
Bitmap bitmap = image.Image;
using (Stream s = new MemoryStream())
{
bitmap.Save(s, ImageFormat.Png);
s.Seek(0, SeekOrigin.Begin);
Texture tex = Texture.FromStream(device, s, bitmap.Width, bitmap.Height, 0, Usage.None,
Format.Unknown,
Pool.Managed, Filter.None, Filter.None, 0);
textures.Add(image, tex);
visibleCells.Add(image, new List <TexturedVertex>());
}
}
List <TexturedVertex> currentList = visibleCells[image];
int pixelsPerCell = 8;
int x = (cell.X * pixelsPerCell) - viewport.X;
int y = (cell.Y * pixelsPerCell) - viewport.Y;
int w = 8;
int h = 8;
// Calculate the (u,v) we need to use based on the tile coordinates.
float scaleW = 8.0f / image.Image.Width;
float scaleH = 8.0f / image.Image.Height;
float uStart = cell.X * scaleW;
float vStart = cell.Y * scaleH;
float uEnd = uStart + scaleW;
float vEnd = vStart + scaleH;
// Clockwise winding
// TODO: Index these vertices! argh
var v0 = new TexturedVertex(new Vector4(x, y, RenderingZOffset, 1.0f), new Vector2(uStart, vStart));
var v1 = new TexturedVertex(new Vector4(x + w, y, RenderingZOffset, 1.0f), new Vector2(uEnd, vStart));
var v2 = new TexturedVertex(new Vector4(x + w, y + h, RenderingZOffset, 1.0f),
new Vector2(uEnd, vEnd));
var v3 = new TexturedVertex(new Vector4(x, y, RenderingZOffset, 1.0f), new Vector2(uStart, vStart));
var v4 = new TexturedVertex(new Vector4(x + w, y + h, RenderingZOffset, 1.0f),
new Vector2(uEnd, vEnd));
var v5 = new TexturedVertex(new Vector4(x, y + h, RenderingZOffset, 1.0f), new Vector2(uStart, vEnd));
currentList.Add(v0);
currentList.Add(v1);
currentList.Add(v2);
currentList.Add(v3);
currentList.Add(v4);
currentList.Add(v5);
}
// 2. Fill buffer.
////
DataStream stream = vertexBuffer.Lock(0, 0, LockFlags.Discard);
foreach (var vertexList in visibleCells)
{
if (vertexList.Value.Count == 0)
{
continue;
}
stream.WriteRange(vertexList.Value.ToArray());
}
vertexBuffer.Unlock();
// 3. Draw.
////
device.SetSamplerState(0, SamplerState.MinFilter, TextureFilter.Linear);
device.SetStreamSource(0, vertexBuffer, 0, TexturedVertex.Size);
device.VertexDeclaration = vertexDecl;
int offset = 0;
foreach (var vertexList in visibleCells)
{
var texture = textures[vertexList.Key];
device.SetTexture(0, texture);
int tilesToDraw = vertexList.Value.Count / 3;
device.DrawPrimitives(PrimitiveType.TriangleList, offset, tilesToDraw);
offset += tilesToDraw * 3;
}
}
