On 11/04/2016 12:23 PM, Matt Turner wrote:
> On Sun, Oct 30, 2016 at 11:45 PM, Boyan Ding <boyan.j.d...@gmail.com> wrote:
>> According to OpenGL Shading Language 4.50 spec, Section 8.7 "Vector
>> Relational Functions", functions of this type do not operate on scalar
>> types, so remove scalar types from signature definitions to make the
>> behavior consistent with glslangValidator and other drivers.
>
> Yep. Looks like it's always been this way.
>
> The patch is
>
> Reviewed-by: Matt Turner <matts...@gmail.com>
>
> Since this seems to be untested by any suite, could you provide some
> piglit parser tests that confirm that lessThanEqual(scalar, scalar),
> et al doesn't work?
>
> Rant: what a stupid mess to require <= for scalars but lessThanEqual
> for vectors.
I think it makes sense. What would 'vec4(...) < vec4(...)' return? A
bvec4? How much time would like to spend with a the compiler error that
would result from
if (a < b) {
...
}
because a and b happen to be vectors. I bet about an equal number of
people think that would be stupid as think the current requirement of
comparison functions for vectors is stupid. :)
> Somewhere on my todo list is a GLSL extension that fixes things like this...
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