Implement prev_pow2 - will need this for 360 to round down texture

formats if passed value too large
2012-11-21 20:47:20 +01:00 · 2012-11-21 20:47:20 +01:00 · 52b46d9fd6
parent 8456464650
commit 52b46d9fd6
1 changed files with 10 additions and 0 deletions
--- a/general.h
+++ b/general.h
@ -632,6 +632,16 @@ static inline uint32_t next_pow2(uint32_t v)
   return v;
 }

+static inline uint32_t prev_pow2(uint32_t v)
+{
+   v |= v >> 1;
+   v |= v >> 2;
+   v |= v >> 4;
+   v |= v >> 8;
+   v |= v >> 16;
+   return v - (v >> 1);
+}
+
 static inline uint8_t is_little_endian(void)
 {
   union