Differences between revisions 1 and 2

SDL_MostSignificantBitIndex32

Use this function to get the index of the most significant (set) bit in a 32-bit number. This is also the same as the base 2 logarithm of the number.

Contents

Syntax

int SDL_MostSignificantBitIndex32(Uint32 x)

x	the number to find the MSB of

Returns the index of the most significant bit of x, or -1 if x is 0.

if (bitmask) {
    int index = SDL_MostSignificantBitIndex32(bitmask);
}

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None: SDL_MostSignificantBitIndex32 (last edited 2013-08-10 19:55:41 by PhilippWiesemann)

-  ⇤ ← Revision 1 as of 2013-02-13 17:41:35 → 
  Size: 1247
  Editor: jorgenpt
  Comment: Initial documents for MSBIndex32
+   ← Revision 2 as of 2013-08-07 23:36:44 → ⇥
  Size: 1165
  Editor: Sam Lantinga
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-||<tablewidth="100%" style="color: #FF0000;" :> DRAFT||
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-Sint8 SDL_MostSignificantBitIndex32(Uint32 x)
+int SDL_MostSignificantBitIndex32(Uint32 x)
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-Returns the index of the most significant bit if x is > 0, otherwise output is undefined.
+Returns the index of the most significant bit of x, or -1 if x is 0.
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+Line 31:
-    Sint8 index = SDL_MostSignificantBitIndex32(bitmask);
+    int index = SDL_MostSignificantBitIndex32(bitmask);