diff options
| author | Kent Quirk <q@lindenlab.com> | 2009-01-05 18:59:12 +0000 |
|---|---|---|
| committer | Kent Quirk <q@lindenlab.com> | 2009-01-05 18:59:12 +0000 |
| commit | 667ca55bad0108c4bdf8f007b89e1a52fc766aad (patch) | |
| tree | 7bd62ac8d9af079c3994565f3f200ccc250bbc28 /indra/llmath | |
| parent | 95f365789f4cebc7bd97ccefd538f14d481a8373 (diff) | |
svn merge -r106715:HEAD svn+ssh://svn.lindenlab.com/svn/linden/branches/q/notifications-merge-r106715 . QAR-1149 -- Final merge of notifications to trunk.
Diffstat (limited to 'indra/llmath')
| -rw-r--r-- | indra/llmath/llmath.h | 24 | ||||
| -rw-r--r-- | indra/llmath/llrect.h | 5 |
2 files changed, 29 insertions, 0 deletions
diff --git a/indra/llmath/llmath.h b/indra/llmath/llmath.h index 0372bae106..916f4aa6c7 100644 --- a/indra/llmath/llmath.h +++ b/indra/llmath/llmath.h @@ -103,6 +103,30 @@ const F32 FP_MAG_THRESHOLD = 0.0000001f; // TODO: Replace with logic like is_approx_equal inline BOOL is_approx_zero( F32 f ) { return (-F_APPROXIMATELY_ZERO < f) && (f < F_APPROXIMATELY_ZERO); } +// These functions work by interpreting sign+exp+mantissa as an unsigned +// integer. +// For example: +// x = <sign>1 <exponent>00000010 <mantissa>00000000000000000000000 +// y = <sign>1 <exponent>00000001 <mantissa>11111111111111111111111 +// +// interpreted as ints = +// x = 10000001000000000000000000000000 +// y = 10000000111111111111111111111111 +// which is clearly a different of 1 in the least significant bit +// Values with the same exponent can be trivially shown to work. +// +// WARNING: Denormals of opposite sign do not work +// x = <sign>1 <exponent>00000000 <mantissa>00000000000000000000001 +// y = <sign>0 <exponent>00000000 <mantissa>00000000000000000000001 +// Although these values differ by 2 in the LSB, the sign bit makes +// the int comparison fail. +// +// WARNING: NaNs can compare equal +// There is no special treatment of exceptional values like NaNs +// +// WARNING: Infinity is comparable with F32_MAX and negative +// infinity is comparable with F32_MIN + inline BOOL is_approx_equal(F32 x, F32 y) { const S32 COMPARE_MANTISSA_UP_TO_BIT = 0x02; diff --git a/indra/llmath/llrect.h b/indra/llmath/llrect.h index 21ca4189ff..93b69714de 100644 --- a/indra/llmath/llrect.h +++ b/indra/llmath/llrect.h @@ -223,6 +223,11 @@ public: return *this; } + bool isValid() const + { + return mLeft <= mRight && mBottom <= mTop; + } + bool isNull() const { return mLeft == mRight || mBottom == mTop; |