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authorwm4 <wm4@nowhere>2014-04-08 19:13:15 +0200
committerwm4 <wm4@nowhere>2014-04-17 22:58:47 +0200
commit34cee2a77d00d4986cba309d1758d1cfeeb25530 (patch)
tree42eeed44885b731ad651f6659ad6906c71a8aa67
parent8f5eb7b780cf7598157179d0679863e3b7a90084 (diff)
downloadmpv-34cee2a77d00d4986cba309d1758d1cfeeb25530.tar.bz2
mpv-34cee2a77d00d4986cba309d1758d1cfeeb25530.tar.xz
vo_vdpau: document what WRAP_ADD does
This wasn't necessarily clear.
-rw-r--r--video/out/vo_vdpau.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/video/out/vo_vdpau.c b/video/out/vo_vdpau.c
index 8c50e44d6b..13c291e218 100644
--- a/video/out/vo_vdpau.c
+++ b/video/out/vo_vdpau.c
@@ -50,6 +50,8 @@
#include "osdep/timer.h"
#include "bitmap_packer.h"
+// Returns x + a, but wrapped around to the range [0, m)
+// a must be within [-m, m], x within [0, m)
#define WRAP_ADD(x, a, m) ((a) < 0 \
? ((x)+(a)+(m) < (m) ? (x)+(a)+(m) : (x)+(a)) \
: ((x)+(a) < (m) ? (x)+(a) : (x)+(a)-(m)))