template in metal shading language

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Created Jul ’15

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Hi,

This is my shader code, it is throwing runtime error during building library. It seems like compilation errors. How to use templates exactly?

template<typename T>
kernel void add(const device T *In1 [[buffer(0)]],
                const device T *In2 [[buffer(1)]],
                device T *Out [[buffer(2)]],
                uint tid [[thread_position_in_grid]]){
        Out[tid] = In1[tid] + In2[tid];
}

Thank you! 🙂

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Answer 1

Elijah Semenov OP

Jul ’15

Templates can not be used on functions with kernel/vertex/fragment attributes because template code is compiled when it's instantiated with some new type. Of course, it would be nice to get such functions from library with newFunctionWithName:@"add<someType>", but it will require expensive source code compilation during runtime, which is, actually, what Metal design is avoiding.

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