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mesa: Fix clamping to -1.0 in snorm_to_float

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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 <siglesias@igalia.com>:
    - Modify snorm_to_float() to avoid doing the division when
      x == -MAX_INT(src_bits)

Cc: 10.4 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Jason Ekstrand 2014-08-23 08:36:46 -07:00 • committed by Iago Toral Quiroga
parent 3b5f206475
commit 7d1b08ac44
1 changed files with 1 additions and 1 deletions
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2
src/mesa/main/format_utils.c
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@ -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));