[vlc-commits] commit: OpenGL: use clz() ( Rémi Denis-Courmont )

[git at videolan.org]

vlc | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Sat Nov 13 18:47:44 2010 +0200| [b9a7045b5126535b46d4afb94329e5d38c260467] | committer: Rémi Denis-Courmont 

OpenGL: use clz()

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=b9a7045b5126535b46d4afb94329e5d38c260467
---

 modules/video_output/opengl.c |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/modules/video_output/opengl.c b/modules/video_output/opengl.c
index e7ea1ab..d66eaec 100644
--- a/modules/video_output/opengl.c
+++ b/modules/video_output/opengl.c
@@ -93,14 +93,11 @@
 # define VLCGL_TYPE   VLCGL_RGB_TYPE
 #endif
 
-static inline int GetAlignedSize(int i_size)
+static inline int GetAlignedSize(unsigned size)
 {
-    /* Return the nearest power of 2 */
-    int i_result = 1;
-    while(i_result < i_size)
-        i_result *= 2;
-
-    return i_result;
+    /* Return the smallest larger or equal power of 2 */
+    unsigned align = 1 << (8 * sizeof (unsigned) - clz(size));
+    return ((align >> 1) == size) ? size : align;
 }
 
 int vout_display_opengl_Init(vout_display_opengl_t *vgl,