<html>
<head>
<title>OgreBitwise.h Source File - OGRE Documentation</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link type="text/css" rel="stylesheet" href="style.css">
</head>
<body>
<!-- Generated by Doxygen 1.3.6 -->
<div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Class List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Class Members</a> | <a class="qindex" href="globals.html">File Members</a> | <a class="qindex" href="pages.html">Related Pages</a></div>
<h1>OgreBitwise.h</h1><a href="OgreBitwise_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*</span>
00002 <span class="comment">-----------------------------------------------------------------------------</span>
00003 <span class="comment">This source file is part of OGRE</span>
00004 <span class="comment"> (Object-oriented Graphics Rendering Engine)</span>
00005 <span class="comment">For the latest info, see http://www.ogre3d.org/</span>
00006 <span class="comment"></span>
00007 <span class="comment">Copyright (c) 2000-2005 The OGRE Team</span>
00008 <span class="comment">Also see acknowledgements in Readme.html</span>
00009 <span class="comment"></span>
00010 <span class="comment">This program is free software; you can redistribute it and/or modify it under</span>
00011 <span class="comment">the terms of the GNU Lesser General Public License as published by the Free Software</span>
00012 <span class="comment">Foundation; either version 2 of the License, or (at your option) any later</span>
00013 <span class="comment">version.</span>
00014 <span class="comment"></span>
00015 <span class="comment">This program is distributed in the hope that it will be useful, but WITHOUT</span>
00016 <span class="comment">ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span>
00017 <span class="comment">FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.</span>
00018 <span class="comment"></span>
00019 <span class="comment">You should have received a copy of the GNU Lesser General Public License along with</span>
00020 <span class="comment">this program; if not, write to the Free Software Foundation, Inc., 59 Temple</span>
00021 <span class="comment">Place - Suite 330, Boston, MA 02111-1307, USA, or go to</span>
00022 <span class="comment">http://www.gnu.org/copyleft/lesser.txt.</span>
00023 <span class="comment">-----------------------------------------------------------------------------</span>
00024 <span class="comment">*/</span>
00025 <span class="preprocessor">#ifndef _Bitwise_H__</span>
00026 <span class="preprocessor"></span><span class="preprocessor">#define _Bitwise_H__</span>
00027 <span class="preprocessor"></span>
00028 <span class="preprocessor">#include "<a class="code" href="OgrePrerequisites_8h.html">OgrePrerequisites.h</a>"</span>
00029
00030 <span class="keyword">namespace </span>Ogre {
00031
<a name="l00034"></a><a class="code" href="classOgre_1_1Bitwise.html">00034</a> <span class="keyword">class </span><a class="code" href="classOgre_1_1Bitwise.html">Bitwise</a> {
00035 <span class="keyword">public</span>:
00039 <span class="keyword">template</span><<span class="keyword">typename</span> T>
<a name="l00040"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee0">00040</a> <span class="keyword">static</span> <a class="code" href="OgrePlatform_8h.html#a8">FORCEINLINE</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee0">getBitShift</a>(T mask)
00041 {
00042 <span class="keywordflow">if</span> (mask == 0)
00043 <span class="keywordflow">return</span> 0;
00044
00045 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> result = 0;
00046 <span class="keywordflow">while</span> ((mask & 1) == 0) {
00047 ++result;
00048 mask >>= 1;
00049 }
00050 <span class="keywordflow">return</span> result;
00051 }
00052
00058 <span class="keyword">template</span><<span class="keyword">typename</span> SrcT, <span class="keyword">typename</span> DestT>
<a name="l00059"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee1">00059</a> <span class="keyword">static</span> <span class="keyword">inline</span> DestT <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee1">convertBitPattern</a>(SrcT srcValue, SrcT srcBitMask, DestT destBitMask)
00060 {
00061 <span class="comment">// Mask off irrelevant source value bits (if any)</span>
00062 srcValue = srcValue & srcBitMask;
00063
00064 <span class="comment">// Shift source down to bottom of DWORD</span>
00065 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> srcBitShift = <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee0">getBitShift</a>(srcBitMask);
00066 srcValue >>= srcBitShift;
00067
00068 <span class="comment">// Get max value possible in source from srcMask</span>
00069 <span class="keyword">const</span> SrcT srcMax = srcBitMask >> srcBitShift;
00070
00071 <span class="comment">// Get max avaiable in dest</span>
00072 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> destBitShift = <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee0">getBitShift</a>(destBitMask);
00073 <span class="keyword">const</span> DestT destMax = destBitMask >> destBitShift;
00074
00075 <span class="comment">// Scale source value into destination, and shift back</span>
00076 DestT destValue = (srcValue * destMax) / srcMax;
00077 <span class="keywordflow">return</span> (destValue << destBitShift);
00078 }
00079
<a name="l00084"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee2">00084</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee2">fixedToFixed</a>(<a class="code" href="namespaceOgre.html#a412">uint32</a> value, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> p)
00085 {
00086 <span class="keywordflow">if</span>(n > p)
00087 {
00088 <span class="comment">// Less bits required than available; this is easy</span>
00089 value >>= n-p;
00090 }
00091 <span class="keywordflow">else</span> <span class="keywordflow">if</span>(n < p)
00092 {
00093 <span class="comment">// More bits required than are there, do the fill</span>
00094 <span class="comment">// Use old fashioned division, probably better than a loop</span>
00095 <span class="keywordflow">if</span>(value == 0)
00096 value = 0;
00097 <span class="keywordflow">else</span> <span class="keywordflow">if</span>(value == (static_cast<unsigned int>(1)<<n)-1)
00098 value = (1<<p)-1;
00099 <span class="keywordflow">else</span> value = value*(1<<p)/((1<<n)-1);
00100 }
00101 <span class="keywordflow">return</span> value;
00102 }
00103
<a name="l00108"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee3">00108</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee3">floatToFixed</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> value, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bits)
00109 {
00110 <span class="keywordflow">if</span>(value <= 0.0f) <span class="keywordflow">return</span> 0;
00111 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (value >= 1.0f) <span class="keywordflow">return</span> (1<<bits)-1;
00112 <span class="keywordflow">else</span> <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)(value * (1<<bits));
00113 }
00114
<a name="l00118"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee4">00118</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">float</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee4">fixedToFloat</a>(<span class="keywordtype">unsigned</span> value, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bits)
00119 {
00120 <span class="keywordflow">return</span> (<span class="keywordtype">float</span>)value/(<span class="keywordtype">float</span>)((1<<bits)-1);
00121 }
00122
<a name="l00126"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee5">00126</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee5">intWrite</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *dest, <span class="keyword">const</span> <span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> value)
00127 {
00128 <span class="keywordflow">switch</span>(n) {
00129 <span class="keywordflow">case</span> 1:
00130 ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)dest)[0] = (<a class="code" href="namespaceOgre.html#a414">uint8</a>)value;
00131 <span class="keywordflow">break</span>;
00132 <span class="keywordflow">case</span> 2:
00133 ((<a class="code" href="namespaceOgre.html#a413">uint16</a>*)dest)[0] = (<a class="code" href="namespaceOgre.html#a413">uint16</a>)value;
00134 <span class="keywordflow">break</span>;
00135 <span class="keywordflow">case</span> 3:
00136 <span class="preprocessor">#if OGRE_ENDIAN == OGRE_ENDIAN_BIG </span>
00137 <span class="preprocessor"></span> ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)dest)[0] = (<a class="code" href="namespaceOgre.html#a414">uint8</a>)((value >> 16) & 0xFF);
00138 ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)dest)[1] = (<a class="code" href="namespaceOgre.html#a414">uint8</a>)((value >> 8) & 0xFF);
00139 ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)dest)[2] = (<a class="code" href="namespaceOgre.html#a414">uint8</a>)(value & 0xFF);
00140 <span class="preprocessor">#else</span>
00141 <span class="preprocessor"></span> ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)dest)[2] = (<a class="code" href="namespaceOgre.html#a414">uint8</a>)((value >> 16) & 0xFF);
00142 ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)dest)[1] = (<a class="code" href="namespaceOgre.html#a414">uint8</a>)((value >> 8) & 0xFF);
00143 ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)dest)[0] = (<a class="code" href="namespaceOgre.html#a414">uint8</a>)(value & 0xFF);
00144 <span class="preprocessor">#endif</span>
00145 <span class="preprocessor"></span> <span class="keywordflow">break</span>;
00146 <span class="keywordflow">case</span> 4:
00147 ((<a class="code" href="namespaceOgre.html#a412">uint32</a>*)dest)[0] = (<a class="code" href="namespaceOgre.html#a412">uint32</a>)value;
00148 <span class="keywordflow">break</span>;
00149 }
00150 }
<a name="l00154"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee6">00154</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee6">intRead</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *src, <span class="keywordtype">int</span> n) {
00155 <span class="keywordflow">switch</span>(n) {
00156 <span class="keywordflow">case</span> 1:
00157 <span class="keywordflow">return</span> ((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)src)[0];
00158 <span class="keywordflow">case</span> 2:
00159 <span class="keywordflow">return</span> ((<a class="code" href="namespaceOgre.html#a413">uint16</a>*)src)[0];
00160 <span class="keywordflow">case</span> 3:
00161 <span class="preprocessor">#if OGRE_ENDIAN == OGRE_ENDIAN_BIG </span>
00162 <span class="preprocessor"></span> <span class="keywordflow">return</span> ((<a class="code" href="namespaceOgre.html#a412">uint32</a>)((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)src)[0]<<16)|
00163 ((<a class="code" href="namespaceOgre.html#a412">uint32</a>)((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)src)[1]<<8)|
00164 ((<a class="code" href="namespaceOgre.html#a412">uint32</a>)((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)src)[2]);
00165 <span class="preprocessor">#else</span>
00166 <span class="preprocessor"></span> <span class="keywordflow">return</span> ((<a class="code" href="namespaceOgre.html#a412">uint32</a>)((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)src)[0])|
00167 ((<a class="code" href="namespaceOgre.html#a412">uint32</a>)((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)src)[1]<<8)|
00168 ((<a class="code" href="namespaceOgre.html#a412">uint32</a>)((<a class="code" href="namespaceOgre.html#a414">uint8</a>*)src)[2]<<16);
00169 <span class="preprocessor">#endif</span>
00170 <span class="preprocessor"></span> <span class="keywordflow">case</span> 4:
00171 <span class="keywordflow">return</span> ((<a class="code" href="namespaceOgre.html#a412">uint32</a>*)src)[0];
00172 }
00173 <span class="keywordflow">return</span> 0; <span class="comment">// ?</span>
00174 }
00175
<a name="l00179"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee7">00179</a> <span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="namespaceOgre.html#a413">uint16</a> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee7">floatToHalf</a>(<span class="keywordtype">float</span> i)
00180 {
00181 <span class="keywordflow">return</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee8">floatToHalfI</a>(*reinterpret_cast<uint32*>(&i));
00182 }
<a name="l00185"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee8">00185</a> <span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="namespaceOgre.html#a413">uint16</a> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee8">floatToHalfI</a>(<a class="code" href="namespaceOgre.html#a412">uint32</a> i)
00186 {
00187 <span class="keyword">register</span> <span class="keywordtype">int</span> s = (i >> 16) & 0x00008000;
00188 <span class="keyword">register</span> <span class="keywordtype">int</span> e = ((i >> 23) & 0x000000ff) - (127 - 15);
00189 <span class="keyword">register</span> <span class="keywordtype">int</span> m = i & 0x007fffff;
00190
00191 <span class="keywordflow">if</span> (e <= 0)
00192 {
00193 <span class="keywordflow">if</span> (e < -10)
00194 {
00195 <span class="keywordflow">return</span> 0;
00196 }
00197 m = (m | 0x00800000) >> (1 - e);
00198
00199 <span class="keywordflow">return</span> s | (m >> 13);
00200 }
00201 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (e == 0xff - (127 - 15))
00202 {
00203 <span class="keywordflow">if</span> (m == 0) <span class="comment">// Inf</span>
00204 {
00205 <span class="keywordflow">return</span> s | 0x7c00;
00206 }
00207 <span class="keywordflow">else</span> <span class="comment">// NAN</span>
00208 {
00209 m >>= 13;
00210 <span class="keywordflow">return</span> s | 0x7c00 | m | (m == 0);
00211 }
00212 }
00213 <span class="keywordflow">else</span>
00214 {
00215 <span class="keywordflow">if</span> (e > 30) <span class="comment">// Overflow</span>
00216 {
00217 <span class="keywordflow">return</span> s | 0x7c00;
00218 }
00219
00220 <span class="keywordflow">return</span> s | (e << 10) | (m >> 13);
00221 }
00222 }
00223
<a name="l00228"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee9">00228</a> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">float</span> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee9">halfToFloat</a>(<a class="code" href="namespaceOgre.html#a413">uint16</a> y)
00229 {
00230 <a class="code" href="namespaceOgre.html#a412">uint32</a> r = <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee10">halfToFloatI</a>(y);
00231 <span class="keywordflow">return</span> *reinterpret_cast<float*>(&r);
00232 }
<a name="l00236"></a><a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee10">00236</a> <span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="namespaceOgre.html#a412">uint32</a> <a class="code" href="classOgre_1_1Bitwise.html#Ogre_1_1Bitwisee10">halfToFloatI</a>(<a class="code" href="namespaceOgre.html#a413">uint16</a> y)
00237 {
00238 <span class="keyword">register</span> <span class="keywordtype">int</span> s = (y >> 15) & 0x00000001;
00239 <span class="keyword">register</span> <span class="keywordtype">int</span> e = (y >> 10) & 0x0000001f;
00240 <span class="keyword">register</span> <span class="keywordtype">int</span> m = y & 0x000003ff;
00241
00242 <span class="keywordflow">if</span> (e == 0)
00243 {
00244 <span class="keywordflow">if</span> (m == 0) <span class="comment">// Plus or minus zero</span>
00245 {
00246 <span class="keywordflow">return</span> s << 31;
00247 }
00248 <span class="keywordflow">else</span> <span class="comment">// Denormalized number -- renormalize it</span>
00249 {
00250 <span class="keywordflow">while</span> (!(m & 0x00000400))
00251 {
00252 m <<= 1;
00253 e -= 1;
00254 }
00255
00256 e += 1;
00257 m &= ~0x00000400;
00258 }
00259 }
00260 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (e == 31)
00261 {
00262 <span class="keywordflow">if</span> (m == 0) <span class="comment">// Inf</span>
00263 {
00264 <span class="keywordflow">return</span> (s << 31) | 0x7f800000;
00265 }
00266 <span class="keywordflow">else</span> <span class="comment">// NaN</span>
00267 {
00268 <span class="keywordflow">return</span> (s << 31) | 0x7f800000 | (m << 13);
00269 }
00270 }
00271
00272 e = e + (127 - 15);
00273 m = m << 13;
00274
00275 <span class="keywordflow">return</span> (s << 31) | (e << 23) | m;
00276 }
00277
00278
00279 };
00280 }
00281
00282 <span class="preprocessor">#endif</span>
</pre></div><p>
Copyright © 2000-2005 by The OGRE Team<br />
Last modified Wed Feb 23 00:19:02 2005
</p>
</body>
</html>
distrib
>
Mandriva
>
10.2
>
i586
>
media
>
contrib
>
by-pkgid
>
04e5d8c10ae76748689b4e7f48e0fa33
>
files
>
272
