MTLStepFunction.perPatch The post-tessellation function fetches data based on the patch index of the patch. Declarationcase perPatch See AlsoStep optionsMTLStepFunction.constantMTLStepFunction.perInstanceMTLStepFunction.perPatchControlPointMTLStepFunction.perVertexMTLStepFunction.threadPositionInGridXMTLStepFunction.threadPositionInGridYMTLStepFunction.threadPositionInGridXIndexedMTLStepFunction.threadPositionInGridYIndexed