[Mesa-dev] [PATCH] glsl: Allow default precision qualifiers to be set for sampler types.
eric at anholt.net
Tue Feb 12 15:33:08 PST 2013
Paul Berry <stereotype441 at gmail.com> writes:
> From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
> "The precision statement
> precision precision-qualifier type;
> can be used to establish a default precision qualifier. The type
> field can be either int or float or any of the sampler types, and
> the precision-qualifier can be lowp, mediump, or highp."
> GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
> qualifiers on sampler types, but this seems like an oversight (since
> the intention of including these in GLSL 1.30 is to allow
> compatibility with ES shaders).
> Previously, Mesa followed GLSL 1.30 and only allowed default precision
> qualifiers to be set for float and int. This patch makes it follow
> GLSL ES rules in all cases.
Also, what a weird language -- you can set different precisions for ints
vs floats vs all the different samplers, but not uints? usampler
precision might matter separately from isampler, but not uint vs int?
Reviewed-by: Eric Anholt <eric at anholt.net>
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