Is there a way to pass our C++ maths vector class to an ISPC export
function as a short vector? It feels like there must be a way to do this,
but the compiler denies it's possible, and the docs don't mention anything
at all.
A simple example:
// test.ispc
export uniform float<3> AddVectors(uniform float<3> a, uniform float<3> b)
{
return a + b;
}
// Vector.h
class Vector
{
public:
float X;
float Y;
float Z;
/* snip operators and helper functions */
};
// Test.cpp
Vector a = {1.f, 2.f, 3.f};
Vector b = {4.f, 5.f, 6.f};
Vector result = ispc::AddVectors(a, b);
This returns ispc errors complaining about the use of short vectors in the
function signature:
<source>:42:25: Error: Illegal to return a "varying" or vector type from
exported function "AddVectors"
export uniform float<3> AddVectors(uniform float<3> a, uniform float<3> b)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<source>:42:53: Error: Vector-typed parameter "a" is illegal in an
exported function.
export uniform float<3> AddVectors(uniform float<3> a, uniform float<3> b)
^
<source>:42:73: Error: Vector-typed parameter "b" is illegal in an
exported function.
export uniform float<3> AddVectors(uniform float<3> a, uniform float<3> b)
>From what I can tell, my alternatives are to do some conversion manually,
eg use uniform float[3], or uniform float*, or pass x/y/z parameters
separately.
Am I missing another option?
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