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| author | Keith Whitwell <keith@tungstengraphics.com> | 2008-11-15 16:23:31 +0000 |
|---|---|---|
| committer | Keith Whitwell <keith@tungstengraphics.com> | 2008-11-15 16:23:31 +0000 |
| commit | 5e1454a036be6da2c48e2e20bf6f8047ee1a94d3 (patch) | |
| tree | 660228843fc88f2e43d975921e7d4e078e483f1c /src/gallium/auxiliary/util/u_math.h | |
| parent | 56ef0aeda5d23bf0c6147fd9d20d61abd18207af (diff) | |
| parent | 7e584a70c492698be18bf4d6372b50d1a1c38385 (diff) | |
Merge commit 'origin/gallium-0.1' into gallium-0.2
Conflicts:
src/mesa/drivers/dri/common/dri_util.c
Diffstat (limited to 'src/gallium/auxiliary/util/u_math.h')
| -rw-r--r-- | src/gallium/auxiliary/util/u_math.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h index fdaec8df82..653d79ccd5 100644 --- a/src/gallium/auxiliary/util/u_math.h +++ b/src/gallium/auxiliary/util/u_math.h @@ -246,8 +246,9 @@ util_fast_exp(float x) } -#define LOG2_TABLE_SIZE_LOG2 8 -#define LOG2_TABLE_SIZE (1 << LOG2_TABLE_SIZE_LOG2) +#define LOG2_TABLE_SIZE_LOG2 16 +#define LOG2_TABLE_SCALE (1 << LOG2_TABLE_SIZE_LOG2) +#define LOG2_TABLE_SIZE (LOG2_TABLE_SCALE + 1) extern float log2_table[LOG2_TABLE_SIZE]; @@ -258,7 +259,8 @@ util_fast_log2(float x) float epart, mpart; num.f = x; epart = (float)(((num.i & 0x7f800000) >> 23) - 127); - mpart = log2_table[(num.i & 0x007fffff) >> (23 - LOG2_TABLE_SIZE_LOG2)]; + /* mpart = log2_table[mantissa*LOG2_TABLE_SCALE + 0.5] */ + mpart = log2_table[((num.i & 0x007fffff) + (1 << (22 - LOG2_TABLE_SIZE_LOG2))) >> (23 - LOG2_TABLE_SIZE_LOG2)]; return epart + mpart; } |