/// <summary>
/// Sets <see cref="CubismMaskTile"/>.
/// </summary>
/// <param name="value">Value to set.</param>
/// <returns>Instance.</returns>
internal CubismMaskRenderer SetMaskTile(CubismMaskTile value)
{
MaskProperties.SetVector(CubismShaderVariables.MaskTile, value);
return(this);
}
/// <summary>
/// Sets the mask tile to write to and read from.
/// </summary>
/// <param name="value">Value to set.</param>
/// <returns>Instance.</returns>
public CubismMaskMaskedJunction SetMaskTile(CubismMaskTile value)
{
MaskTile = value;
return(this);
}
/// <summary>
/// Converts from <see cref="CubismMaskTile"/> to index.
/// </summary>
/// <param name="tile">Tile to convert.</param>
/// <returns>Tile index.</returns>
private int ToIndex(CubismMaskTile tile)
{
var tileCounts = (int)Mathf.Pow(4, Subdivisions - 1);
var tilesPerRow = (int)Mathf.Pow(2, Subdivisions - 1);
return((int)((tile.Channel * tileCounts) + (tile.Column * tilesPerRow) + tile.Row));
}
/// <summary>
/// Acquires tiles.
/// </summary>
/// <param name="count">Number of tiles to acquire.</param>
/// <returns>Acquired tiles on success; <see langword="null"/> otherwise.</returns>
public CubismMaskTile[] AcquireTiles(int count)
{
var result = new CubismMaskTile[count];
// Populate container.
for (var i = 0; i < count; ++i)
{
var allocationSuccessful = false;
for (var j = 0; j < Slots.Length; ++j)
{
// Skip occupied slots.
if (Slots[j])
{
continue;
}
// Generate tile.
result[i] = ToTile(j);
// Flag slot as occupied.
Slots[j] = true;
// Flag allocation as successful.
allocationSuccessful = true;
break;
}
// Return as soon as one allocation fails.
if (!allocationSuccessful)
{
return(null);
}
}
// Return on success.
return(result);
}