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<hr><h1>fast_floor.h</h1><a href="fast__floor_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00007 <font class="comment">/* Copyright, 2000, 2001 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025
00026 <font class="preprocessor">#ifndef NL_FAST_FLOOR_H</font>
00027 <font class="preprocessor"></font><font class="preprocessor">#define NL_FAST_FLOOR_H</font>
00028 <font class="preprocessor"></font>
00029 <font class="preprocessor">#include "<a class="code" href="types__nl_8h.html">nel/misc/types_nl.h</a>"</font>
00030 <font class="preprocessor">#include <math.h></font>
00031
00032 <font class="keyword">namespace </font>NL3D
00033 {
00034
00035 <font class="comment">// fastFloor function. </font>
00036 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
00037 <font class="preprocessor"></font>
00038 <font class="preprocessor">#include <float.h></font>
00039
00040 <font class="comment">// The magic constant value. support both positive and negative numbers.</font>
00041 <font class="keyword">extern</font> <font class="keywordtype">double</font> <a class="code" href="namespaceNL3D.html#a34">OptFastFloorMagicConst</a> ;
00042 <font class="keyword">extern</font> <font class="keywordtype">int</font> <a class="code" href="namespaceNL3D.html#a35">OptFastFloorBkupCW</a> ;
00043 <font class="comment">// init float CW.</font>
00044 <font class="keyword">inline</font> <font class="keywordtype">void</font> <a class="code" href="namespaceNL3D.html#a334">OptFastFloorBegin</a>()
00045 {
00046 <a class="code" href="namespaceNL3D.html#a35">OptFastFloorBkupCW</a>= _controlfp(0, 0);
00047 _controlfp( _RC_DOWN|_PC_53, _MCW_RC|_MCW_PC );
00048 }
00049
00050 <font class="comment">// reset float CW.</font>
00051 <font class="keyword">inline</font> <font class="keywordtype">void</font> <a class="code" href="namespaceNL3D.html#a335">OptFastFloorEnd</a>()
00052 {
00053 _controlfp(<a class="code" href="namespaceNL3D.html#a35">OptFastFloorBkupCW</a>, _MCW_RC|_MCW_PC);
00054 }
00055
00056 <font class="comment">// Force __stdcall to not pass parameters in registers.</font>
00057 <font class="keyword">inline</font> <a class="code" href="types__nl_8h.html#a8">sint32</a> __stdcall <a class="code" href="namespaceNL3D.html#a336">OptFastFloor</a>(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a>)
00058 {
00059 <font class="keyword">static</font> __int64 res;
00060 __asm
00061 {
00062 fld <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a>
00063 fadd qword ptr <a class="code" href="namespaceNL3D.html#a34">OptFastFloorMagicConst</a>
00064 fstp qword ptr res
00065 }
00066
00067 <font class="keywordflow">return</font> (sint32) res;
00068 }
00069
00070
00071 <font class="comment">// Force __stdcall to not pass parameters in registers.</font>
00072 <font class="keyword">inline</font> <font class="keywordtype">float</font> __stdcall <a class="code" href="namespaceNL3D.html#a337">OptFastFractionnalPart</a>(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a>)
00073 {
00074 <font class="keyword">static</font> <font class="keywordtype">double</font> res;
00075 __asm
00076 {
00077 fld <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a>
00078 fld st(0)
00079 fadd qword ptr <a class="code" href="namespaceNL3D.html#a34">OptFastFloorMagicConst</a>
00080 fstp qword ptr res
00081 fisub dword ptr res
00082 fstp dword ptr res
00083 }
00084
00085 <font class="keywordflow">return</font> * (<font class="keywordtype">float</font> *) &res;
00086 }
00087
00088
00089
00090
00091 <font class="preprocessor">#else</font>
00092 <font class="preprocessor"></font><font class="keyword">inline</font> <font class="keywordtype">void</font> <a class="code" href="namespaceNL3D.html#a334">OptFastFloorBegin</a>() {}
00093 <font class="keyword">inline</font> <font class="keywordtype">void</font> <a class="code" href="namespaceNL3D.html#a335">OptFastFloorEnd</a>() {}
00094 <font class="keyword">inline</font> <a class="code" href="types__nl_8h.html#a12">sint</a> <a class="code" href="namespaceNL3D.html#a336">OptFastFloor</a>(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a>)
00095 {
00096 <font class="keywordflow">return</font> (sint)floor(<a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a>);
00097 }
00098
00099 <font class="keyword">inline</font> <font class="keywordtype">float</font> <a class="code" href="namespaceNL3D.html#a337">OptFastFractionnalPart</a>(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a>)
00100 {
00101 <font class="keywordflow">return</font> <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a> - (sint) <a class="code" href="driver__opengl__extension__def_8h.html#a231">x</a> ;
00102 }
00103
00104
00105 <font class="preprocessor">#endif</font>
00106 <font class="preprocessor"></font>
00107
00108
00109 } <font class="comment">// NL3D</font>
00110
00111
00112 <font class="preprocessor">#endif // NL_FAST_FLOOR_H</font>
00113 <font class="preprocessor"></font>
00114 <font class="comment">/* End of fast_floor.h */</font>
</pre></div>
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