diff options
author | Ira Rice <irarice@gmail.com> | 2008-12-07 16:53:32 -0700 |
---|---|---|
committer | Ira Rice <irarice@gmail.com> | 2008-12-07 16:53:32 -0700 |
commit | aef082e6fe4fca268f9bfe401409eb342f82e4af (patch) | |
tree | 26e9f2f2be9ad59666a4c039c7717e0e5becd3eb /src/utils | |
parent | 7f24abc455a407e84f13d75099e36db77fa8931d (diff) | |
parent | a7c21e6f8add37af7412449742ec55c8daa8571a (diff) | |
download | mana-aef082e6fe4fca268f9bfe401409eb342f82e4af.tar.gz mana-aef082e6fe4fca268f9bfe401409eb342f82e4af.tar.bz2 mana-aef082e6fe4fca268f9bfe401409eb342f82e4af.tar.xz mana-aef082e6fe4fca268f9bfe401409eb342f82e4af.zip |
Merge commit 'a7c21e6f8add37af7412449742ec55c8daa8571a'
Conflicts:
AUTHORS
CMakeLists.txt
ChangeLog
INSTALL
README
aethyra.cbp
configure.ac
data/help/changes.txt
data/help/commands.txt
data/help/header.txt
data/help/support.txt
src/Makefile.am
src/aethyra.rc
src/being.cpp
src/being.h
src/equipment.cpp
src/equipment.h
src/floor_item.h
src/game.cpp
src/gui/buddywindow.cpp
src/gui/char_select.cpp
src/gui/char_server.cpp
src/gui/chat.cpp
src/gui/chat.h
src/gui/equipmentwindow.cpp
src/gui/equipmentwindow.h
src/gui/gui.cpp
src/gui/inventorywindow.cpp
src/gui/inventorywindow.h
src/gui/itemcontainer.cpp
src/gui/itemcontainer.h
src/gui/minimap.cpp
src/gui/ministatus.cpp
src/gui/newskill.cpp
src/gui/npc_text.cpp
src/gui/npclistdialog.h
src/gui/ok_dialog.cpp
src/gui/setup_video.cpp
src/gui/skill.cpp
src/gui/skill.h
src/gui/status.h
src/gui/table_model.h
src/gui/updatewindow.cpp
src/gui/viewport.cpp
src/inventory.cpp
src/inventory.h
src/keyboardconfig.cpp
src/keyboardconfig.h
src/localplayer.cpp
src/localplayer.h
src/logindata.h
src/main.cpp
src/map.cpp
src/monster.cpp
src/monster.h
src/net/beinghandler.cpp
src/net/beinghandler.h
src/net/buysellhandler.cpp
src/net/equipmenthandler.cpp
src/net/loginhandler.cpp
src/net/loginhandler.h
src/net/network.h
src/net/npchandler.cpp
src/net/playerhandler.cpp
src/net/protocol.h
src/net/tradehandler.cpp
src/npc.cpp
src/npc.h
src/particleemitter.cpp
src/particleemitterprop.h
src/player.cpp
src/player.h
src/player_relations.cpp
src/resources/imageset.cpp
src/resources/imageset.h
src/resources/itemdb.cpp
src/resources/mapreader.cpp
src/resources/monsterinfo.h
src/text.cpp
src/text.h
src/textmanager.cpp
src/textmanager.h
src/tileset.h
src/utils/fastsqrt.h
src/utils/strprintf.cpp
src/winver.h
tools/tmxcopy/Makefile
tools/tmxcopy/base64.cpp
tools/tmxcopy/base64.h
tools/tmxcopy/tostring.h
Signed-off-by: Ira Rice <irarice@gmail.com>
Diffstat (limited to 'src/utils')
-rw-r--r-- | src/utils/fastsqrt.h | 48 |
1 files changed, 24 insertions, 24 deletions
diff --git a/src/utils/fastsqrt.h b/src/utils/fastsqrt.h index 8da1d354..78768149 100644 --- a/src/utils/fastsqrt.h +++ b/src/utils/fastsqrt.h @@ -1,24 +1,24 @@ -/* A very fast function to calculate the approximate inverse square root of a
- * floating point value and a helper function that uses it for getting the
- * normal squareroot. For an explanation of the inverse squareroot function
- * read:
- * http://www.math.purdue.edu/~clomont/Math/Papers/2003/InvSqrt.pdf
- *
- * Unfortunately the original creator of this function seems to be unknown.
- */
-
-float fastInvSqrt(float x)
-{
- union { int i; float x; } tmp;
- float xhalf = 0.5f * x;
- tmp.x = x;
- tmp.i = 0x5f375a86 - (tmp.i >> 1);
- x = tmp.x;
- x = x * (1.5f - xhalf * x * x);
- return x;
-}
-
-float fastSqrt(float x)
-{
- return 1.0f / fastInvSqrt(x);
-}
+/* A very fast function to calculate the approximate inverse square root of a + * floating point value and a helper function that uses it for getting the + * normal squareroot. For an explanation of the inverse squareroot function + * read: + * http://www.math.purdue.edu/~clomont/Math/Papers/2003/InvSqrt.pdf + * + * Unfortunately the original creator of this function seems to be unknown. + */ + +float fastInvSqrt(float x) +{ + union { int i; float x; } tmp; + float xhalf = 0.5f * x; + tmp.x = x; + tmp.i = 0x5f375a86 - (tmp.i >> 1); + x = tmp.x; + x = x * (1.5f - xhalf * x * x); + return x; +} + +float fastSqrt(float x) +{ + return 1.0f / fastInvSqrt(x); +} |