public IEnumerable<Tuple<ITile, TileCoord>> Cull(ViewFrustum frustum)
{
for (int i=0; i<grids.Count; i++)
{
TileGrid grid = grids[i];
TileRegion region = grid.GetRegion(i);
foreach (int row in region.Rows())
{
foreach (int col in region.Cols())
{
ITile tile = grid[row, col];
if (tile != null)
yield return new Tuple<ITile, TileCoord>(tile, new TileCoord(row, col, i));
}
}
}
}
public virtual void Render(ViewFrustum frustum)
{
GL.EnableClientState(ArrayCap.VertexArray);
GL.EnableClientState(ArrayCap.TextureCoordArray);
vertices.Bind(true);
GL.VertexPointer(3, VertexPointerType.Float, 0, 0);
texCoords.Bind(true);
GL.TexCoordPointer(3, TexCoordPointerType.Float, 0, 0);
GL.EnableClientState(ArrayCap.IndexArray);
GL.DrawElements(BeginMode.Quads, quadCount, DrawElementsType.UnsignedShort, 0);
foreach (Tuple<ITile, TileCoord> tile in scene.Cull(frustum))
{
TileCoord coord = tile.Item2;
GL.PushMatrix();
GL.Translate(coord.Col, coord.Row, 0.0);
if (tile.Item1 is FloorTile)
{
FloorTile ftile = (FloorTile) tile.Item1;
Material material = ftile.Material;
for (int i=0; i<material.Count; i++)
{
Texture tex = material[i];
GL.ActiveTexture(TextureUnit.Texture0 + i);
tex.Bind(true);
}
GL.DrawArrays(BeginMode.Quads, 0, 4);
}
GL.PopMatrix();
}
GL.DisableClientState(ArrayCap.VertexArray);
GL.DisableClientState(ArrayCap.TextureCoordArray);
GL.DisableClientState(ArrayCap.IndexArray);
}
public List<Tuple<ITile, TileCoord>> Culling(ViewFrustum frustum, LevelScene scene)
{
List<Tuple<ITile, TileCoord>> viewTiles = new List<Tuple<ITile, TileCoord>>();
Culling(frustum, scene, viewTiles);
return viewTiles;
}
private void Culling(ViewFrustum frustum, LevelScene scene, List<Tuple<ITile, TileCoord>> viewTiles)
{
if (IsLeaf)
{
foreach (TileCoord tileCoord in region.TileCoords())
{
ITile tile = scene.GetTile(tileCoord);
if (tile != null)
{
viewTiles.Add(new Tuple<ITile, TileCoord>(tile, tileCoord));
}
}
}
else
{
for (int k = 0; k < 4; k++)
{
if (children[k] == null)
continue;
if (frustum.Intersects(children[k].Bounds))
Culling(frustum, scene, viewTiles);
}
}
}