vec_step
Takes a built-in scalar or vector data type argument and returns an integer value representing the number of elements in the scalar or vector.
Description
The vec_step built-in function takes a built-in scalar or vector
data type argument and returns an integer value representing the number of elements
in the scalar or vector.
For all scalar types, vec_step returns 1.
The vec_step built-in functions that take a 3-component vector return 4.
vec_step may also take a pure type as an argument,
e.g. vec_step(float2)
We use the generic type name gentypen
(or gentypem) to indicate the
built-in data types char{2|4|8|16}, uchar{2|4|8|16},
short{2|4|8|16}, ushort{2|4|8|16}, int{2|4|8|16},
uint{2|4|8|16}, long{2|4|8|16}, ulong{2|4|8|16},
float{2|4|8|16} or double{2|4|8|16}
as the type for the arguments unless otherwise
stated. We use the generic name ugentypen
to indicate the built-in unsigned integer data types.
The generic type name gentypen
(or gentypem)
may indicate the data type half{2|4|8|16} if the
cl_khr_fp16 extension
is supported.
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