On Wednesday, December 10, 2014 03:53:57 PM Michel Dänzer wrote: > On 09.12.2014 21:06, Iago Toral Quiroga wrote: > > From: Jason Ekstrand <jason.ekstr...@intel.com> > > > > This patch fixes the return of a wrong value when x is lower than > > -MAX_INT(src_bits) as the result would not be between [-1.0 1.0]. > > > > v2 by Samuel Iglesias <sigles...@igalia.com>: > > - Modify unorm_to_float() to avoid doing the division when > > > > x == -MAX_INT(src_bits) > > > > Reviewed-by: Ian Romanick <ian.d.roman...@intel.com> > > --- > > > > src/mesa/main/format_utils.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/src/mesa/main/format_utils.c b/src/mesa/main/format_utils.c > > index 93a0cea..5dd0848 100644 > > --- a/src/mesa/main/format_utils.c > > +++ b/src/mesa/main/format_utils.c > > @@ -152,7 +152,7 @@ unorm_to_float(unsigned x, unsigned src_bits) > > > > static inline float > > snorm_to_float(int x, unsigned src_bits) > > { > > > > - if (x == -MAX_INT(src_bits)) > > + if (x <= -MAX_INT(src_bits)) > > > > return -1.0f; > > > > else > > > > return x * (1.0f / (float)MAX_INT(src_bits)); > > The commit log talks about unorm_to_float, but the code modifies > snorm_to_float. Also, I think something like > > mesa: Fix clamping to -1.0 in snorm_to_float > > would be a more useful shortlog. >
Oh right! I will fix it. > > BTW, don't this function and unorm_to_float also need corresponding > clamping to 1.0 for values >= MAX_INT(src_bits)? Yes, it makes sense. I will add that check in both places. Thanks! Sam
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