# convertSparsePixelRegions(_:toTileRegions:withTileSize:alignmentMode:numRegions:) Converts a list of sparse pixel regions to tile regions. ``` optional func convertSparsePixelRegions(_ pixelRegions: UnsafePointer, toTileRegions tileRegions: UnsafeMutablePointer, withTileSize tileSize: MTLSize, alignmentMode mode: MTLSparseTextureRegionAlignmentMode, numRegions: Int) ``` ## Parameters `pixelRegions` A pointer to a C array of pixel [`MTLRegion`](/documentation/Metal/MTLRegion) instances. `tileRegions` A pointer to a C array of tile [`MTLRegion`](/documentation/Metal/MTLRegion) instances. `tileSize` An [`MTLSize`](/documentation/Metal/MTLSize) instance that represents a sparse tile’s size, in pixels. `mode` An [`MTLSparseTextureRegionAlignmentMode`](/documentation/Metal/MTLSparseTextureRegionAlignmentMode) instance. `numRegions` The number of regions you want the method to convert. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)