# MetalPerformanceShaders Functions ## Topics ### Functions [`func MPSDataTypeBitsCount(MPSDataType) -> Int`](/documentation/MetalPerformanceShaders/MPSDataTypeBitsCount(_:)) [`func MPSFindIntegerDivisionParams(UInt16) -> MPSIntegerDivisionParams`](/documentation/MetalPerformanceShaders/MPSFindIntegerDivisionParams(_:)) Returns the integer division parameters for a specified divisor. [`func MPSGetCustomKernelBatchedDestinationIndex(MPSCustomKernelArgumentCount) -> UInt`](/documentation/MetalPerformanceShaders/MPSGetCustomKernelBatchedDestinationIndex(_:)) Returns the index of the first destination texture argument. [`func MPSGetCustomKernelBatchedSourceIndex(MPSCustomKernelArgumentCount, UInt, UInt) -> UInt`](/documentation/MetalPerformanceShaders/MPSGetCustomKernelBatchedSourceIndex(_:_:_:)) Returns the index of the specified batched source texture argument. [`func MPSGetCustomKernelBroadcastSourceIndex(MPSCustomKernelArgumentCount, UInt, UInt) -> UInt`](/documentation/MetalPerformanceShaders/MPSGetCustomKernelBroadcastSourceIndex(_:_:_:)) Returns the index of the specified nonbatched source texture argument. [`func MPSGetCustomKernelMaxBatchSize(MPSCustomKernelArgumentCount, UInt) -> UInt`](/documentation/MetalPerformanceShaders/MPSGetCustomKernelMaxBatchSize(_:_:)) Returns the maximum allowed batch size. [`func MPSGetImageType(MPSImage) -> MPSImageType`](/documentation/MetalPerformanceShaders/MPSGetImageType(_:)) [`func MPSGetPreferredDevice(MPSDeviceOptions) -> (any MTLDevice)?`](/documentation/MetalPerformanceShaders/MPSGetPreferredDevice(_:)) [`func MPSHintTemporaryMemoryHighWaterMark(any MTLCommandBuffer, Int)`](/documentation/MetalPerformanceShaders/MPSHintTemporaryMemoryHighWaterMark(_:_:)) Triggers Metal Performance Shaders to prefetch a Metal heap of the indicated size into its internal cache. [`func MPSImageBatchIncrementReadCount([MPSImage], Int) -> Int`](/documentation/MetalPerformanceShaders/MPSImageBatchIncrementReadCount(_:_:)) Increments or decrements the read count of an image batch by a specified amount. [`func MPSImageBatchIterate([MPSImage], (MPSImage, Int) -> Int) -> Int`](/documentation/MetalPerformanceShaders/MPSImageBatchIterate(_:_:)) Executes a callback block once for each unique image in a batch. [`func MPSImageBatchResourceSize([MPSImage]) -> Int`](/documentation/MetalPerformanceShaders/MPSImageBatchResourceSize(_:)) Returns the number of bytes used to allocate the specified image batch. [`func MPSImageBatchSynchronize([MPSImage], any MTLCommandBuffer)`](/documentation/MetalPerformanceShaders/MPSImageBatchSynchronize(_:_:)) Removes any copy of the specified image batch from the device’s caches, and, if needed, invalidates any CPU caches. [`func MPSSetHeapCacheDuration(any MTLCommandBuffer, Double)`](/documentation/MetalPerformanceShaders/MPSSetHeapCacheDuration(_:_:)) Sets the timeout after which unused cached Metal heaps are released. [`func MPSSizeofMPSDataType(MPSDataType) -> Int`](/documentation/MetalPerformanceShaders/MPSSizeofMPSDataType(_:)) [`func MPSStateBatchIncrementReadCount([MPSState]?, Int) -> Int`](/documentation/MetalPerformanceShaders/MPSStateBatchIncrementReadCount(_:_:)) Increments or decrements the read count of a state batch by a specified amount. [`func MPSStateBatchResourceSize([MPSState]?) -> Int`](/documentation/MetalPerformanceShaders/MPSStateBatchResourceSize(_:)) Returns the number of bytes used to allocate the specified state batch. [`func MPSStateBatchSynchronize([MPSState], any MTLCommandBuffer)`](/documentation/MetalPerformanceShaders/MPSStateBatchSynchronize(_:_:)) Removes any copy of the specified state batch from the device’s caches, and, if needed, invalidates any CPU caches. --- 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)