On 24.08.2017 14:19, Erik Faye-Lund wrote:
On Wed, Aug 23, 2017 at 6:19 PM, Marek Olšák <mar...@gmail.com> wrote:
On Wed, Aug 23, 2017 at 3:08 PM, Nicolai Hähnle <nhaeh...@gmail.com> wrote:
Here's another question: What does "low precision" mean on a texture
instruction? Are the offsets low precision or is it the output? Maybe we can
punt on this for now -- at least GCN doesn't have low precision there
anyway.
HalfPrecision means that all dst and src sources can be 16-bit.
If the consumer of a TEX instruction is 16-bit, TEX should return
16-bit automatically. If a source of a TEX instruction is 16-bit, TEX
should accept 16-bit automatically.
This sounds inconsistent with how lowp works; a texture-sampler
declared as lowp in GLSL only have low precision output AFAIK.
lowp and mediump are entirely optional concepts. Their precision can be
as high as highp operations.
Cheers,
Nicolai
--
Lerne, wie die Welt wirklich ist,
Aber vergiss niemals, wie sie sein sollte.
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