diff options
author | Younes Manton <younes.m@gmail.com> | 2009-09-27 14:40:14 -0400 |
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committer | Younes Manton <younes.m@gmail.com> | 2009-09-27 19:25:57 -0400 |
commit | da793b743462e84e3bca7a0ed7f24b4c942e0834 (patch) | |
tree | 0ec0b8d0107297368b642dc540cd6e31b0082706 /src/gallium/auxiliary/util | |
parent | 540039887ac19b5fdd099ccaad6b44b5db973c25 (diff) |
util: Add util_next_power_of_two() for rounding a uint up to a POT.
Diffstat (limited to 'src/gallium/auxiliary/util')
-rw-r--r-- | src/gallium/auxiliary/util/u_math.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h index cd6a9fcc09..75b075f160 100644 --- a/src/gallium/auxiliary/util/u_math.h +++ b/src/gallium/auxiliary/util/u_math.h @@ -471,6 +471,26 @@ util_logbase2(unsigned n) /** + * Returns the smallest power of two >= x + */ +static INLINE unsigned +util_next_power_of_two(unsigned x) +{ + unsigned i; + + if (x == 0) + return 1; + + --x; + + for (i = 1; i < sizeof(unsigned) * 8; i <<= 1) + x |= x >> i; + + return x + 1; +} + + +/** * Clamp X to [MIN, MAX]. * This is a macro to allow float, int, uint, etc. types. */ |