# MetalPerformanceShaders Enumerations ## Topics ### Enumerations [`enum MPSAccelerationStructureStatus`](/documentation/MetalPerformanceShaders/MPSAccelerationStructureStatus) Constants that indicate an acceleration structure build state. [`struct MPSAccelerationStructureUsage`](/documentation/MetalPerformanceShaders/MPSAccelerationStructureUsage) Options that describe how an acceleration structure will be used. [`struct MPSAliasingStrategy`](/documentation/MetalPerformanceShaders/MPSAliasingStrategy) [`enum MPSBoundingBoxIntersectionTestType`](/documentation/MetalPerformanceShaders/MPSBoundingBoxIntersectionTestType) Options for the intersection test type for a ray intersector bounding box. [`struct MPSCNNBatchNormalizationFlags`](/documentation/MetalPerformanceShaders/MPSCNNBatchNormalizationFlags) Options that define how statistics are calculated during batch normalization. [`struct MPSCNNConvolutionGradientOption`](/documentation/MetalPerformanceShaders/MPSCNNConvolutionGradientOption) Options that control which gradient to compute during backward propagation. [`enum MPSCNNConvolutionWeightsLayout`](/documentation/MetalPerformanceShaders/MPSCNNConvolutionWeightsLayout) [`enum MPSCNNLossType`](/documentation/MetalPerformanceShaders/MPSCNNLossType) Constants that indicate supported loss filter types. [`enum MPSCNNReductionType`](/documentation/MetalPerformanceShaders/MPSCNNReductionType) Constants that indicate supported reduction types. [`enum MPSCNNWeightsQuantizationType`](/documentation/MetalPerformanceShaders/MPSCNNWeightsQuantizationType) Options that specify the type of quantization used to generate unsigned integer weights. [`struct MPSCustomKernelIndex`](/documentation/MetalPerformanceShaders/MPSCustomKernelIndex) [`struct MPSDeviceCapsValues`](/documentation/MetalPerformanceShaders/MPSDeviceCapsValues) [`struct MPSDeviceOptions`](/documentation/MetalPerformanceShaders/MPSDeviceOptions) [`enum MPSFloatDataTypeBit`](/documentation/MetalPerformanceShaders/MPSFloatDataTypeBit) [`enum MPSFloatDataTypeShift`](/documentation/MetalPerformanceShaders/MPSFloatDataTypeShift) [`struct MPSImageType`](/documentation/MetalPerformanceShaders/MPSImageType) Options that define a Metal Performance Shaders image type. [`enum MPSIntersectionDataType`](/documentation/MetalPerformanceShaders/MPSIntersectionDataType) Options that determine the data contained in an intersection result. [`enum MPSIntersectionType`](/documentation/MetalPerformanceShaders/MPSIntersectionType) Options that determine an intersection type for a ray intersector. [`struct MPSMatrixRandomDistribution`](/documentation/MetalPerformanceShaders/MPSMatrixRandomDistribution) [`struct MPSNDArrayQuantizationScheme`](/documentation/MetalPerformanceShaders/MPSNDArrayQuantizationScheme) [`struct MPSNNComparisonType`](/documentation/MetalPerformanceShaders/MPSNNComparisonType) [`struct MPSNNConvolutionAccumulatorPrecisionOption`](/documentation/MetalPerformanceShaders/MPSNNConvolutionAccumulatorPrecisionOption) Options that specify convolution accumulator precision. [`enum MPSNNRegularizationType`](/documentation/MetalPerformanceShaders/MPSNNRegularizationType) [`struct MPSNNTrainingStyle`](/documentation/MetalPerformanceShaders/MPSNNTrainingStyle) Options that control how graph nodes are trained. [`enum MPSPolygonType`](/documentation/MetalPerformanceShaders/MPSPolygonType) [`enum MPSRNNMatrixId`](/documentation/MetalPerformanceShaders/MPSRNNMatrixId) Options that define which matrix is copied in or out of a trainable RNN layer. [`enum MPSRayDataType`](/documentation/MetalPerformanceShaders/MPSRayDataType) Options for the data type for an intersector ray. [`enum MPSRayMaskOperator`](/documentation/MetalPerformanceShaders/MPSRayMaskOperator) [`struct MPSRayMaskOptions`](/documentation/MetalPerformanceShaders/MPSRayMaskOptions) Options for ray intersector mask options. [`enum MPSStateResourceType`](/documentation/MetalPerformanceShaders/MPSStateResourceType) Options for the underlying resource type for a state object. [`enum MPSTemporalWeighting`](/documentation/MetalPerformanceShaders/MPSTemporalWeighting) [`enum MPSTransformType`](/documentation/MetalPerformanceShaders/MPSTransformType) Constants that indicate instance transformation types. [`enum MPSTriangleIntersectionTestType`](/documentation/MetalPerformanceShaders/MPSTriangleIntersectionTestType) Options for the ray-triangle intersection test. --- 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)