Add Objects in NS::Array (MetalCPP)

Question

Created Jun ’23

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I found it is really difficult to add or modify the objects in MetalCPP with NS::Array, and there is no NS::MutableArray. I tried to use std::vector<MTL::AccelerationStructure*>* instead. However, MTL::InstanceAccelerationStructureDescriptor setInstancedAccelerationStructures() method needs to pass in a NS::Array type! How can I convert between them?

I did all those in C++.

Answered by Graphics and Games Engineer in 756240022

Hi QuintonQ,

Once you have your data in the std::vector, you can create an NS::Array using the CFArrayCreate function:

NS::Array* pArray = (NS::Array*)CFArrayCreate(kCFAllocatorDefault, (const void **)accelStructures.data(), accelStructures.size(), &kCFTypeArrayCallBacks);

This function is defined in <CoreFoundation/CoreFoundation.h>.

Because its name contains "Create", remember to release the array after your program no longer needs it.

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Answer 1

Graphics and Games Engineer OP

Apple

Jun ’23

Accepted Answer

Hi QuintonQ,

Once you have your data in the std::vector, you can create an NS::Array using the CFArrayCreate function:

NS::Array* pArray = (NS::Array*)CFArrayCreate(kCFAllocatorDefault, (const void **)accelStructures.data(), accelStructures.size(), &kCFTypeArrayCallBacks);

This function is defined in <CoreFoundation/CoreFoundation.h>.

Because its name contains "Create", remember to release the array after your program no longer needs it.

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