int mipbias = 4; // 3 is sufficient, but at 4 it loads
#endregion Fields
#region Constructors
public VirtualTexture( D3D10.Device device, VirtualTextureInfo info, int atlassize, int uploadsperframe, string filename )
{
this.device = device;
this.info = info;
this.atlascount = atlassize / info.PageSize;
this.uploadsperframe = uploadsperframe;
indexer = new PageIndexer( info );
toload = new List<PageCount>( indexer.Count );
Console.Write( "Creating PageAtlas...");
atlas = new TextureAtlas( device, info, atlascount, uploadsperframe );
Console.WriteLine("done.");
Console.Write( "Creating PageLoader..." );
loader = new PageLoader( filename + ".cache", indexer, info );
Console.WriteLine("done.");
cache = new PageCache( info, atlas, loader, indexer, atlascount );
Console.Write( "Creating PageTable...");
pagetable = new PageTable( device, cache, info, indexer );
Console.WriteLine("done.");
}
readonly int[] sizes; // This stores the sizes of various mip levels
#endregion Fields
#region Constructors
public PageIndexer( VirtualTextureInfo info )
{
this.info = info;
mipcount = MathExtensions.Log2(info.PageTableSize) + 1;
sizes = new int[mipcount];
for( int i = 0; i < mipcount; ++i )
sizes[i] = ( info.VirtualTextureSize / info.TileSize ) >> i;
offsets = new int[mipcount];
Count = 0;
for( int i = 0; i < mipcount; ++i )
{
offsets[i] = Count;
Count += sizes[i] * sizes[i];
}
// Calculate reverse mapping
reverse = new Page[Count];
for( int i = 0; i < mipcount; ++i )
{
int size = sizes[i];
for( int y = 0; y < size; ++y )
for( int x = 0; x < size; ++x )
{
Page page = new Page( x, y, i );
reverse[this[page]] = page;
}
}
}
public TextureAtlas( D3D10.Device device, VirtualTextureInfo info, int count, int uploadsperframe )
{
this.device = device;
this.info = info;
int pagesize = info.PageSize;
resource = new Direct3D.Texture( device, count * pagesize, count * pagesize, DXGI.Format.R8G8B8A8_UNorm, D3D10.ResourceUsage.Default, 1 );
staging = new Direct3D.StagingTexturePool( device, pagesize, pagesize, DXGI.Format.R8G8B8A8_UNorm, uploadsperframe, D3D10.CpuAccessFlags.Write );
}
public PageLoader( string filename, PageIndexer indexer, VirtualTextureInfo info )
{
this.filename = filename;
this.info = info;
this.indexer = indexer;
file = new TileDataFile( filename, info, FileAccess.Read );
readthread = new ProcessingThread<ReadState>( LoadPage, PageLoadComplete );
}
public TileDataFile( string filename, VirtualTextureInfo info, FileAccess access )
{
Debug.Assert( DataOffset >= Marshal.SizeOf(typeof(VirtualTextureInfo)) );
this.info = info;
this.size = info.PageSize * info.PageSize * 4;
FileMode mode = FileMode.Open;
if( access != FileAccess.Read )
mode = FileMode.OpenOrCreate;
file = new FileStream( filename, mode, access, FileShare.None, 4096, FileOptions.RandomAccess );
}
int current; // This is used for generating the texture atlas indices before the lru is full
#endregion Fields
#region Constructors
public PageCache( VirtualTextureInfo info, TextureAtlas atlas, PageLoader loader, PageIndexer indexer, int count )
{
this.info = info;
this.atlas = atlas;
this.loader = loader;
this.indexer = indexer;
this.count = count;
lru = new LruCollection<Page,Point>( count * count );
lru.Removed += ( page, point ) => Removed( page, point );
loader.LoadComplete += LoadComplete;
loading = new HashSet<Page>();
}
public PageTable( D3D10.Device device, PageCache cache, VirtualTextureInfo info, PageIndexer indexer )
{
this.info = info;
this.device = device;
this.indexer = indexer;
quadtree = new Quadtree(new Rectangle(0, 0, info.PageTableSize, info.PageTableSize), MathExtensions.Log2(info.PageTableSize));
int size = info.PageTableSize;
texture = new Direct3D.Texture( device, size, size, DXGI.Format.R8G8B8A8_UNorm, D3D10.ResourceUsage.Default, 0 );
staging = new Direct3D.WriteTexture( device, size, size, DXGI.Format.R8G8B8A8_UNorm );
cache.Added += ( Page page, Point pt ) => quadtree.Add( page, pt );
cache.Removed += ( Page page, Point pt ) => quadtree.Remove( page );
SetupDataAndInfo();
}
