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90<div class="contents">
91<a href="irr_math_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (C) 2002-2012 Nikolaus Gebhardt</span>
92<a name="l00002"></a>00002 <span class="comment">// This file is part of the &quot;Irrlicht Engine&quot;.</span>
93<a name="l00003"></a>00003 <span class="comment">// For conditions of distribution and use, see copyright notice in irrlicht.h</span>
94<a name="l00004"></a>00004
95<a name="l00005"></a>00005 <span class="preprocessor">#ifndef __IRR_MATH_H_INCLUDED__</span>
96<a name="l00006"></a>00006 <span class="preprocessor"></span><span class="preprocessor">#define __IRR_MATH_H_INCLUDED__</span>
97<a name="l00007"></a>00007 <span class="preprocessor"></span>
98<a name="l00008"></a>00008 <span class="preprocessor">#include &quot;<a class="code" href="_irr_compile_config_8h.html">IrrCompileConfig.h</a>&quot;</span>
99<a name="l00009"></a>00009 <span class="preprocessor">#include &quot;<a class="code" href="irr_types_8h.html">irrTypes.h</a>&quot;</span>
100<a name="l00010"></a>00010 <span class="preprocessor">#include &lt;math.h&gt;</span>
101<a name="l00011"></a>00011 <span class="preprocessor">#include &lt;float.h&gt;</span>
102<a name="l00012"></a>00012 <span class="preprocessor">#include &lt;stdlib.h&gt;</span> <span class="comment">// for abs() etc.</span>
103<a name="l00013"></a>00013 <span class="preprocessor">#include &lt;limits.h&gt;</span> <span class="comment">// For INT_MAX / UINT_MAX</span>
104<a name="l00014"></a>00014
105<a name="l00015"></a>00015 <span class="preprocessor">#if defined(_IRR_SOLARIS_PLATFORM_) || defined(__BORLANDC__) || defined (__BCPLUSPLUS__) || defined (_WIN32_WCE)</span>
106<a name="l00016"></a>00016 <span class="preprocessor"></span><span class="preprocessor"> #define sqrtf(X) (irr::f32)sqrt((irr::f64)(X))</span>
107<a name="l00017"></a>00017 <span class="preprocessor"></span><span class="preprocessor"> #define sinf(X) (irr::f32)sin((irr::f64)(X))</span>
108<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor"> #define cosf(X) (irr::f32)cos((irr::f64)(X))</span>
109<a name="l00019"></a>00019 <span class="preprocessor"></span><span class="preprocessor"> #define asinf(X) (irr::f32)asin((irr::f64)(X))</span>
110<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor"> #define acosf(X) (irr::f32)acos((irr::f64)(X))</span>
111<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor"> #define atan2f(X,Y) (irr::f32)atan2((irr::f64)(X),(irr::f64)(Y))</span>
112<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor"> #define ceilf(X) (irr::f32)ceil((irr::f64)(X))</span>
113<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor"> #define floorf(X) (irr::f32)floor((irr::f64)(X))</span>
114<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor"> #define powf(X,Y) (irr::f32)pow((irr::f64)(X),(irr::f64)(Y))</span>
115<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor"> #define fmodf(X,Y) (irr::f32)fmod((irr::f64)(X),(irr::f64)(Y))</span>
116<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor"> #define fabsf(X) (irr::f32)fabs((irr::f64)(X))</span>
117<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor"> #define logf(X) (irr::f32)log((irr::f64)(X))</span>
118<a name="l00028"></a>00028 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
119<a name="l00029"></a>00029 <span class="preprocessor"></span>
120<a name="l00030"></a>00030 <span class="preprocessor">#ifndef FLT_MAX</span>
121<a name="l00031"></a><a class="code" href="irr_math_8h.html#a7fbf1534f9e0f0bfdb86fb928902474c">00031</a> <span class="preprocessor"></span><span class="preprocessor">#define FLT_MAX 3.402823466E+38F</span>
122<a name="l00032"></a>00032 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
123<a name="l00033"></a>00033 <span class="preprocessor"></span>
124<a name="l00034"></a>00034 <span class="preprocessor">#ifndef FLT_MIN</span>
125<a name="l00035"></a><a class="code" href="irr_math_8h.html#a890322b63a2fab56b8ff916c08368df6">00035</a> <span class="preprocessor"></span><span class="preprocessor">#define FLT_MIN 1.17549435e-38F</span>
126<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
127<a name="l00037"></a>00037 <span class="preprocessor"></span>
128<a name="l00038"></a>00038 <span class="keyword">namespace </span>irr
129<a name="l00039"></a>00039 {
130<a name="l00040"></a>00040 <span class="keyword">namespace </span>core
131<a name="l00041"></a>00041 {
132<a name="l00042"></a>00042
133<a name="l00044"></a>00044
134<a name="l00045"></a><a class="code" href="namespaceirr_1_1core.html#aac9f99b6a999bdf25fec402c59e8342a">00045</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#aac9f99b6a999bdf25fec402c59e8342a" title="Rounding error constant often used when comparing f32 values.">ROUNDING_ERROR_S32</a> = 0;
135<a name="l00046"></a>00046 <span class="preprocessor">#ifdef __IRR_HAS_S64</span>
136<a name="l00047"></a><a class="code" href="namespaceirr_1_1core.html#acc1ea39594c72f97ff196e97c14ed6f3">00047</a> <span class="preprocessor"></span> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> <a class="code" href="namespaceirr_1_1core.html#acc1ea39594c72f97ff196e97c14ed6f3">ROUNDING_ERROR_S64</a> = 0;
137<a name="l00048"></a>00048 <span class="preprocessor">#endif</span>
138<a name="l00049"></a><a class="code" href="namespaceirr_1_1core.html#a9514dd34463a30102ef8836915cf9c4c">00049</a> <span class="preprocessor"></span> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a9514dd34463a30102ef8836915cf9c4c">ROUNDING_ERROR_f32</a> = 0.000001f;
139<a name="l00050"></a><a class="code" href="namespaceirr_1_1core.html#a7b314c22d6804639cbcbce5231724f0b">00050</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#a7b314c22d6804639cbcbce5231724f0b">ROUNDING_ERROR_f64</a> = 0.00000001;
140<a name="l00051"></a>00051
141<a name="l00052"></a>00052 <span class="preprocessor">#ifdef PI // make sure we don&#39;t collide with a define</span>
142<a name="l00053"></a>00053 <span class="preprocessor"></span><span class="preprocessor">#undef PI</span>
143<a name="l00054"></a>00054 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
144<a name="l00055"></a>00055 <span class="preprocessor"></span>
145<a name="l00056"></a><a class="code" href="namespaceirr_1_1core.html#a26d877e2caf3e6f31c298a0417a0707e">00056</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a26d877e2caf3e6f31c298a0417a0707e" title="Constant for PI.">PI</a> = 3.14159265359f;
146<a name="l00057"></a>00057
147<a name="l00059"></a><a class="code" href="namespaceirr_1_1core.html#ac97bfaa5b44703e61c23c91b88f3ec3a">00059</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#ac97bfaa5b44703e61c23c91b88f3ec3a" title="Constant for reciprocal of PI.">RECIPROCAL_PI</a> = 1.0f/<a class="code" href="namespaceirr_1_1core.html#a26d877e2caf3e6f31c298a0417a0707e" title="Constant for PI.">PI</a>;
148<a name="l00060"></a>00060
149<a name="l00062"></a><a class="code" href="namespaceirr_1_1core.html#abeab884c4376c5740f6d916356e9baa3">00062</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#abeab884c4376c5740f6d916356e9baa3" title="Constant for half of PI.">HALF_PI</a> = <a class="code" href="namespaceirr_1_1core.html#a26d877e2caf3e6f31c298a0417a0707e" title="Constant for PI.">PI</a>/2.0f;
150<a name="l00063"></a>00063
151<a name="l00064"></a>00064 <span class="preprocessor">#ifdef PI64 // make sure we don&#39;t collide with a define</span>
152<a name="l00065"></a>00065 <span class="preprocessor"></span><span class="preprocessor">#undef PI64</span>
153<a name="l00066"></a>00066 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
154<a name="l00067"></a>00067 <span class="preprocessor"></span>
155<a name="l00068"></a><a class="code" href="namespaceirr_1_1core.html#a166af519140dc00cbd88684e835086f8">00068</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#a166af519140dc00cbd88684e835086f8" title="Constant for 64bit PI.">PI64</a> = 3.1415926535897932384626433832795028841971693993751;
156<a name="l00069"></a>00069
157<a name="l00071"></a><a class="code" href="namespaceirr_1_1core.html#ad3a2ddd6d772edb4d663d73fae5434e3">00071</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#ad3a2ddd6d772edb4d663d73fae5434e3" title="Constant for 64bit reciprocal of PI.">RECIPROCAL_PI64</a> = 1.0/<a class="code" href="namespaceirr_1_1core.html#a166af519140dc00cbd88684e835086f8" title="Constant for 64bit PI.">PI64</a>;
158<a name="l00072"></a>00072
159<a name="l00074"></a><a class="code" href="namespaceirr_1_1core.html#a4b91e69e51a2e374aec940cba3869028">00074</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a4b91e69e51a2e374aec940cba3869028" title="32bit Constant for converting from degrees to radians">DEGTORAD</a> = <a class="code" href="namespaceirr_1_1core.html#a26d877e2caf3e6f31c298a0417a0707e" title="Constant for PI.">PI</a> / 180.0f;
160<a name="l00075"></a>00075
161<a name="l00077"></a><a class="code" href="namespaceirr_1_1core.html#ae3a530e0ef661960b7af89f07d817bd5">00077</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#ae3a530e0ef661960b7af89f07d817bd5" title="32bit constant for converting from radians to degrees (formally known as GRAD_PI)">RADTODEG</a> = 180.0f / <a class="code" href="namespaceirr_1_1core.html#a26d877e2caf3e6f31c298a0417a0707e" title="Constant for PI.">PI</a>;
162<a name="l00078"></a>00078
163<a name="l00080"></a><a class="code" href="namespaceirr_1_1core.html#a8e21b5969c8292857f7c9c5dcfd61c35">00080</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#a8e21b5969c8292857f7c9c5dcfd61c35" title="64bit constant for converting from degrees to radians (formally known as GRAD_PI2)">DEGTORAD64</a> = <a class="code" href="namespaceirr_1_1core.html#a166af519140dc00cbd88684e835086f8" title="Constant for 64bit PI.">PI64</a> / 180.0;
164<a name="l00081"></a>00081
165<a name="l00083"></a><a class="code" href="namespaceirr_1_1core.html#ae7afeb48af12f5f5130cd179a644ec58">00083</a> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#ae7afeb48af12f5f5130cd179a644ec58" title="64bit constant for converting from radians to degrees">RADTODEG64</a> = 180.0 / <a class="code" href="namespaceirr_1_1core.html#a166af519140dc00cbd88684e835086f8" title="Constant for 64bit PI.">PI64</a>;
166<a name="l00084"></a>00084
167<a name="l00086"></a>00086
168<a name="l00089"></a><a class="code" href="namespaceirr_1_1core.html#a8deb22ad77fb8ead3f6683bbf9ad3f67">00089</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a8deb22ad77fb8ead3f6683bbf9ad3f67" title="Utility function to convert a radian value to degrees.">radToDeg</a>(<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> radians)
169<a name="l00090"></a>00090 {
170<a name="l00091"></a>00091 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#ae3a530e0ef661960b7af89f07d817bd5" title="32bit constant for converting from radians to degrees (formally known as GRAD_PI)">RADTODEG</a> * radians;
171<a name="l00092"></a>00092 }
172<a name="l00093"></a>00093
173<a name="l00095"></a>00095
174<a name="l00098"></a><a class="code" href="namespaceirr_1_1core.html#aab39939b1518daee0967c368a3bf924a">00098</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#a8deb22ad77fb8ead3f6683bbf9ad3f67" title="Utility function to convert a radian value to degrees.">radToDeg</a>(<a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> radians)
175<a name="l00099"></a>00099 {
176<a name="l00100"></a>00100 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#ae7afeb48af12f5f5130cd179a644ec58" title="64bit constant for converting from radians to degrees">RADTODEG64</a> * radians;
177<a name="l00101"></a>00101 }
178<a name="l00102"></a>00102
179<a name="l00104"></a>00104
180<a name="l00107"></a><a class="code" href="namespaceirr_1_1core.html#ad58b3d0e755a4f25ad19d5f5d4fb0280">00107</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#ad58b3d0e755a4f25ad19d5f5d4fb0280" title="Utility function to convert a degrees value to radians.">degToRad</a>(<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> degrees)
181<a name="l00108"></a>00108 {
182<a name="l00109"></a>00109 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#a4b91e69e51a2e374aec940cba3869028" title="32bit Constant for converting from degrees to radians">DEGTORAD</a> * degrees;
183<a name="l00110"></a>00110 }
184<a name="l00111"></a>00111
185<a name="l00113"></a>00113
186<a name="l00116"></a><a class="code" href="namespaceirr_1_1core.html#a2def535b4f391ceb86ec0497cbb4bf80">00116</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#ad58b3d0e755a4f25ad19d5f5d4fb0280" title="Utility function to convert a degrees value to radians.">degToRad</a>(<a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> degrees)
187<a name="l00117"></a>00117 {
188<a name="l00118"></a>00118 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#a8e21b5969c8292857f7c9c5dcfd61c35" title="64bit constant for converting from degrees to radians (formally known as GRAD_PI2)">DEGTORAD64</a> * degrees;
189<a name="l00119"></a>00119 }
190<a name="l00120"></a>00120
191<a name="l00122"></a>00122 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
192<a name="l00123"></a><a class="code" href="namespaceirr_1_1core.html#a9d34bfdbbe9c136b01ae04974572bc11">00123</a> <span class="keyword">inline</span> <span class="keyword">const</span> T&amp; <a class="code" href="namespaceirr_1_1core.html#a9d34bfdbbe9c136b01ae04974572bc11" title="returns minimum of two values. Own implementation to get rid of the STL (VS6 problems)">min_</a>(<span class="keyword">const</span> T&amp; a, <span class="keyword">const</span> T&amp; b)
193<a name="l00124"></a>00124 {
194<a name="l00125"></a>00125 <span class="keywordflow">return</span> a &lt; b ? a : b;
195<a name="l00126"></a>00126 }
196<a name="l00127"></a>00127
197<a name="l00129"></a>00129 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
198<a name="l00130"></a><a class="code" href="namespaceirr_1_1core.html#a620f62b5ab8b484c16c0236ca7d65d33">00130</a> <span class="keyword">inline</span> <span class="keyword">const</span> T&amp; <a class="code" href="namespaceirr_1_1core.html#a9d34bfdbbe9c136b01ae04974572bc11" title="returns minimum of two values. Own implementation to get rid of the STL (VS6 problems)">min_</a>(<span class="keyword">const</span> T&amp; a, <span class="keyword">const</span> T&amp; b, <span class="keyword">const</span> T&amp; c)
199<a name="l00131"></a>00131 {
200<a name="l00132"></a>00132 <span class="keywordflow">return</span> a &lt; b ? <a class="code" href="namespaceirr_1_1core.html#a9d34bfdbbe9c136b01ae04974572bc11" title="returns minimum of two values. Own implementation to get rid of the STL (VS6 problems)">min_</a>(a, c) : <a class="code" href="namespaceirr_1_1core.html#a9d34bfdbbe9c136b01ae04974572bc11" title="returns minimum of two values. Own implementation to get rid of the STL (VS6 problems)">min_</a>(b, c);
201<a name="l00133"></a>00133 }
202<a name="l00134"></a>00134
203<a name="l00136"></a>00136 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
204<a name="l00137"></a><a class="code" href="namespaceirr_1_1core.html#afca1ce7ac54e0c31a9047947f4c7319b">00137</a> <span class="keyword">inline</span> <span class="keyword">const</span> T&amp; <a class="code" href="namespaceirr_1_1core.html#afca1ce7ac54e0c31a9047947f4c7319b" title="returns maximum of two values. Own implementation to get rid of the STL (VS6 problems)">max_</a>(<span class="keyword">const</span> T&amp; a, <span class="keyword">const</span> T&amp; b)
205<a name="l00138"></a>00138 {
206<a name="l00139"></a>00139 <span class="keywordflow">return</span> a &lt; b ? b : a;
207<a name="l00140"></a>00140 }
208<a name="l00141"></a>00141
209<a name="l00143"></a>00143 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
210<a name="l00144"></a><a class="code" href="namespaceirr_1_1core.html#ae279a231923e0c251ebfd171f03e689c">00144</a> <span class="keyword">inline</span> <span class="keyword">const</span> T&amp; <a class="code" href="namespaceirr_1_1core.html#afca1ce7ac54e0c31a9047947f4c7319b" title="returns maximum of two values. Own implementation to get rid of the STL (VS6 problems)">max_</a>(<span class="keyword">const</span> T&amp; a, <span class="keyword">const</span> T&amp; b, <span class="keyword">const</span> T&amp; c)
211<a name="l00145"></a>00145 {
212<a name="l00146"></a>00146 <span class="keywordflow">return</span> a &lt; b ? <a class="code" href="namespaceirr_1_1core.html#afca1ce7ac54e0c31a9047947f4c7319b" title="returns maximum of two values. Own implementation to get rid of the STL (VS6 problems)">max_</a>(b, c) : <a class="code" href="namespaceirr_1_1core.html#afca1ce7ac54e0c31a9047947f4c7319b" title="returns maximum of two values. Own implementation to get rid of the STL (VS6 problems)">max_</a>(a, c);
213<a name="l00147"></a>00147 }
214<a name="l00148"></a>00148
215<a name="l00150"></a>00150 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
216<a name="l00151"></a><a class="code" href="namespaceirr_1_1core.html#a2cab2ba5899c9262ca29501ea7551c91">00151</a> <span class="keyword">inline</span> T <a class="code" href="namespaceirr_1_1core.html#a2cab2ba5899c9262ca29501ea7551c91" title="returns abs of two values. Own implementation to get rid of STL (VS6 problems)">abs_</a>(<span class="keyword">const</span> T&amp; a)
217<a name="l00152"></a>00152 {
218<a name="l00153"></a>00153 <span class="keywordflow">return</span> a &lt; (T)0 ? -a : a;
219<a name="l00154"></a>00154 }
220<a name="l00155"></a>00155
221<a name="l00158"></a>00158 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
222<a name="l00159"></a><a class="code" href="namespaceirr_1_1core.html#ae2e6a5729b911d26565b508e8b8dae91">00159</a> <span class="keyword">inline</span> T <a class="code" href="namespaceirr_1_1core.html#ae2e6a5729b911d26565b508e8b8dae91">lerp</a>(<span class="keyword">const</span> T&amp; a, <span class="keyword">const</span> T&amp; b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> t)
223<a name="l00160"></a>00160 {
224<a name="l00161"></a>00161 <span class="keywordflow">return</span> (T)(a*(1.f-t)) + (b*t);
225<a name="l00162"></a>00162 }
226<a name="l00163"></a>00163
227<a name="l00165"></a>00165 <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;
228<a name="l00166"></a><a class="code" href="namespaceirr_1_1core.html#a6162f685b68f629e77336081d3316969">00166</a> <span class="keyword">inline</span> <span class="keyword">const</span> T <a class="code" href="namespaceirr_1_1core.html#a6162f685b68f629e77336081d3316969" title="clamps a value between low and high">clamp</a> (<span class="keyword">const</span> T&amp; value, <span class="keyword">const</span> T&amp; low, <span class="keyword">const</span> T&amp; high)
229<a name="l00167"></a>00167 {
230<a name="l00168"></a>00168 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#a9d34bfdbbe9c136b01ae04974572bc11" title="returns minimum of two values. Own implementation to get rid of the STL (VS6 problems)">min_</a> (<a class="code" href="namespaceirr_1_1core.html#afca1ce7ac54e0c31a9047947f4c7319b" title="returns maximum of two values. Own implementation to get rid of the STL (VS6 problems)">max_</a>(value,low), high);
231<a name="l00169"></a>00169 }
232<a name="l00170"></a>00170
233<a name="l00172"></a>00172 <span class="comment">// Note: We use the same trick as boost and use two template arguments to</span>
234<a name="l00173"></a>00173 <span class="comment">// avoid ambiguity when swapping objects of an Irrlicht type that has not</span>
235<a name="l00174"></a>00174 <span class="comment">// it&#39;s own swap overload. Otherwise we get conflicts with some compilers</span>
236<a name="l00175"></a>00175 <span class="comment">// in combination with stl.</span>
237<a name="l00176"></a>00176 <span class="keyword">template</span> &lt;<span class="keyword">class</span> T1, <span class="keyword">class</span> T2&gt;
238<a name="l00177"></a><a class="code" href="namespaceirr_1_1core.html#ab565e5d5112b21ff9b96a0ca0c9b89ad">00177</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespaceirr_1_1core.html#ab565e5d5112b21ff9b96a0ca0c9b89ad" title="swaps the content of the passed parameters">swap</a>(T1&amp; a, T2&amp; b)
239<a name="l00178"></a>00178 {
240<a name="l00179"></a>00179 T1 c(a);
241<a name="l00180"></a>00180 a = b;
242<a name="l00181"></a>00181 b = c;
243<a name="l00182"></a>00182 }
244<a name="l00183"></a>00183
245<a name="l00185"></a><a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3">00185</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3" title="returns if a equals b, taking possible rounding errors into account">equals</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#a7b314c22d6804639cbcbce5231724f0b">ROUNDING_ERROR_f64</a>)
246<a name="l00186"></a>00186 {
247<a name="l00187"></a>00187 <span class="keywordflow">return</span> (a + tolerance &gt;= b) &amp;&amp; (a - tolerance &lt;= b);
248<a name="l00188"></a>00188 }
249<a name="l00189"></a>00189
250<a name="l00191"></a><a class="code" href="namespaceirr_1_1core.html#ae9c63fd2065e6afd30b4537166706ddf">00191</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3" title="returns if a equals b, taking possible rounding errors into account">equals</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#a9514dd34463a30102ef8836915cf9c4c">ROUNDING_ERROR_f32</a>)
251<a name="l00192"></a>00192 {
252<a name="l00193"></a>00193 <span class="keywordflow">return</span> (a + tolerance &gt;= b) &amp;&amp; (a - tolerance &lt;= b);
253<a name="l00194"></a>00194 }
254<a name="l00195"></a>00195
255<a name="l00196"></a><a class="code" href="unionirr_1_1core_1_1_float_int_union32.html">00196</a> <span class="keyword">union </span><a class="code" href="unionirr_1_1core_1_1_float_int_union32.html">FloatIntUnion32</a>
256<a name="l00197"></a>00197 {
257<a name="l00198"></a><a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a8bb52272b7efd87afba959ae50365d24">00198</a> <a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a8bb52272b7efd87afba959ae50365d24">FloatIntUnion32</a>(<span class="keywordtype">float</span> f1 = 0.0<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a6be8ea1e57c1fa1824799c470d08af98">f</a>) : <a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a6be8ea1e57c1fa1824799c470d08af98">f</a>(f1) {}
258<a name="l00199"></a>00199 <span class="comment">// Portable sign-extraction</span>
259<a name="l00200"></a><a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a24af76290e16126c533f6b76391372b3">00200</a> <span class="keywordtype">bool</span> <a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a24af76290e16126c533f6b76391372b3">sign</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> (<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a79c3131fd06e80a7ca80b9c0201c60fb">i</a> &gt;&gt; 31) != 0; }
260<a name="l00201"></a>00201
261<a name="l00202"></a><a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a79c3131fd06e80a7ca80b9c0201c60fb">00202</a> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">irr::s32</a> <a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a79c3131fd06e80a7ca80b9c0201c60fb">i</a>;
262<a name="l00203"></a><a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a6be8ea1e57c1fa1824799c470d08af98">00203</a> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">irr::f32</a> <a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a6be8ea1e57c1fa1824799c470d08af98">f</a>;
263<a name="l00204"></a>00204 };
264<a name="l00205"></a>00205
265<a name="l00207"></a>00207 <span class="comment">//\result true when numbers have a ULP &lt;= maxUlpDiff AND have the same sign.</span>
266<a name="l00208"></a><a class="code" href="namespaceirr_1_1core.html#a730a85283e04b33debcf3b755e5b7603">00208</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#a730a85283e04b33debcf3b755e5b7603" title="We compare the difference in ULP&#39;s (spacing between floating-point numbers, aka ULP=1 means there exi...">equalsByUlp</a>(<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> a, <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> b, <span class="keywordtype">int</span> maxUlpDiff)
267<a name="l00209"></a>00209 {
268<a name="l00210"></a>00210 <span class="comment">// Based on the ideas and code from Bruce Dawson on</span>
269<a name="l00211"></a>00211 <span class="comment">// http://www.altdevblogaday.com/2012/02/22/comparing-floating-point-numbers-2012-edition/</span>
270<a name="l00212"></a>00212 <span class="comment">// When floats are interpreted as integers the two nearest possible float numbers differ just</span>
271<a name="l00213"></a>00213 <span class="comment">// by one integer number. Also works the other way round, an integer of 1 interpreted as float</span>
272<a name="l00214"></a>00214 <span class="comment">// is for example the smallest possible float number.</span>
273<a name="l00215"></a>00215
274<a name="l00216"></a>00216 <a class="code" href="unionirr_1_1core_1_1_float_int_union32.html">FloatIntUnion32</a> fa(a);
275<a name="l00217"></a>00217 <a class="code" href="unionirr_1_1core_1_1_float_int_union32.html">FloatIntUnion32</a> fb(b);
276<a name="l00218"></a>00218
277<a name="l00219"></a>00219 <span class="comment">// Different signs, we could maybe get difference to 0, but so close to 0 using epsilons is better.</span>
278<a name="l00220"></a>00220 <span class="keywordflow">if</span> ( fa.<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a24af76290e16126c533f6b76391372b3">sign</a>() != fb.<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a24af76290e16126c533f6b76391372b3">sign</a>() )
279<a name="l00221"></a>00221 {
280<a name="l00222"></a>00222 <span class="comment">// Check for equality to make sure +0==-0</span>
281<a name="l00223"></a>00223 <span class="keywordflow">if</span> (fa.<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a79c3131fd06e80a7ca80b9c0201c60fb">i</a> == fb.<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a79c3131fd06e80a7ca80b9c0201c60fb">i</a>)
282<a name="l00224"></a>00224 <span class="keywordflow">return</span> <span class="keyword">true</span>;
283<a name="l00225"></a>00225 <span class="keywordflow">return</span> <span class="keyword">false</span>;
284<a name="l00226"></a>00226 }
285<a name="l00227"></a>00227
286<a name="l00228"></a>00228 <span class="comment">// Find the difference in ULPs.</span>
287<a name="l00229"></a>00229 <span class="keywordtype">int</span> ulpsDiff = <a class="code" href="namespaceirr_1_1core.html#a2cab2ba5899c9262ca29501ea7551c91" title="returns abs of two values. Own implementation to get rid of STL (VS6 problems)">abs_</a>(fa.<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a79c3131fd06e80a7ca80b9c0201c60fb">i</a>- fb.<a class="code" href="unionirr_1_1core_1_1_float_int_union32.html#a79c3131fd06e80a7ca80b9c0201c60fb">i</a>);
288<a name="l00230"></a>00230 <span class="keywordflow">if</span> (ulpsDiff &lt;= maxUlpDiff)
289<a name="l00231"></a>00231 <span class="keywordflow">return</span> <span class="keyword">true</span>;
290<a name="l00232"></a>00232
291<a name="l00233"></a>00233 <span class="keywordflow">return</span> <span class="keyword">false</span>;
292<a name="l00234"></a>00234 }
293<a name="l00235"></a>00235
294<a name="l00236"></a>00236 <span class="preprocessor">#if 0</span>
295<a name="l00237"></a>00237 <span class="preprocessor"></span>
296<a name="l00238"></a>00238 <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3" title="returns if a equals b, taking possible rounding errors into account">equals</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> b)
297<a name="l00239"></a>00239 {
298<a name="l00240"></a>00240 <span class="keywordflow">return</span> (a == b);
299<a name="l00241"></a>00241 }
300<a name="l00242"></a>00242
301<a name="l00244"></a>00244 <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3" title="returns if a equals b, taking possible rounding errors into account">equals</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> b)
302<a name="l00245"></a>00245 {
303<a name="l00246"></a>00246 <span class="keywordflow">return</span> (a == b);
304<a name="l00247"></a>00247 }
305<a name="l00248"></a>00248 <span class="preprocessor">#endif</span>
306<a name="l00249"></a>00249 <span class="preprocessor"></span>
307<a name="l00250"></a><a class="code" href="namespaceirr_1_1core.html#afe4784d5bf091acce7777c40c4010ff8">00250</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3" title="returns if a equals b, taking possible rounding errors into account">equals</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#aac9f99b6a999bdf25fec402c59e8342a" title="Rounding error constant often used when comparing f32 values.">ROUNDING_ERROR_S32</a>)
308<a name="l00251"></a>00251 {
309<a name="l00252"></a>00252 <span class="keywordflow">return</span> (a + tolerance &gt;= b) &amp;&amp; (a - tolerance &lt;= b);
310<a name="l00253"></a>00253 }
311<a name="l00254"></a>00254
312<a name="l00256"></a><a class="code" href="namespaceirr_1_1core.html#a9a54aa08fdc2119258ad8dfa44f8dadf">00256</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3" title="returns if a equals b, taking possible rounding errors into account">equals</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#aac9f99b6a999bdf25fec402c59e8342a" title="Rounding error constant often used when comparing f32 values.">ROUNDING_ERROR_S32</a>)
313<a name="l00257"></a>00257 {
314<a name="l00258"></a>00258 <span class="keywordflow">return</span> (a + tolerance &gt;= b) &amp;&amp; (a - tolerance &lt;= b);
315<a name="l00259"></a>00259 }
316<a name="l00260"></a>00260
317<a name="l00261"></a>00261 <span class="preprocessor">#ifdef __IRR_HAS_S64</span>
318<a name="l00262"></a>00262 <span class="preprocessor"></span>
319<a name="l00263"></a><a class="code" href="namespaceirr_1_1core.html#a7928ce8e86ff93d918b0c144efab7b47">00263</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#abf9b9b140cc365908ea4c8c47451e4e3" title="returns if a equals b, taking possible rounding errors into account">equals</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#acc1ea39594c72f97ff196e97c14ed6f3">ROUNDING_ERROR_S64</a>)
320<a name="l00264"></a>00264 {
321<a name="l00265"></a>00265 <span class="keywordflow">return</span> (a + tolerance &gt;= b) &amp;&amp; (a - tolerance &lt;= b);
322<a name="l00266"></a>00266 }
323<a name="l00267"></a>00267 <span class="preprocessor">#endif</span>
324<a name="l00268"></a>00268 <span class="preprocessor"></span>
325<a name="l00270"></a><a class="code" href="namespaceirr_1_1core.html#afc24e6ba26469ec7ca7001ed272dc3b2">00270</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#afc24e6ba26469ec7ca7001ed272dc3b2" title="returns if a equals zero, taking rounding errors into account">iszero</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#a7b314c22d6804639cbcbce5231724f0b">ROUNDING_ERROR_f64</a>)
326<a name="l00271"></a>00271 {
327<a name="l00272"></a>00272 <span class="keywordflow">return</span> fabs(a) &lt;= tolerance;
328<a name="l00273"></a>00273 }
329<a name="l00274"></a>00274
330<a name="l00276"></a><a class="code" href="namespaceirr_1_1core.html#aaf94a81169679083a48f9f9e6dced684">00276</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#afc24e6ba26469ec7ca7001ed272dc3b2" title="returns if a equals zero, taking rounding errors into account">iszero</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#a9514dd34463a30102ef8836915cf9c4c">ROUNDING_ERROR_f32</a>)
331<a name="l00277"></a>00277 {
332<a name="l00278"></a>00278 <span class="keywordflow">return</span> fabsf(a) &lt;= tolerance;
333<a name="l00279"></a>00279 }
334<a name="l00280"></a>00280
335<a name="l00282"></a><a class="code" href="namespaceirr_1_1core.html#a6e179d6dd92b81607f0539329dc2410a">00282</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#a6e179d6dd92b81607f0539329dc2410a" title="returns if a equals not zero, taking rounding errors into account">isnotzero</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> tolerance = <a class="code" href="namespaceirr_1_1core.html#a9514dd34463a30102ef8836915cf9c4c">ROUNDING_ERROR_f32</a>)
336<a name="l00283"></a>00283 {
337<a name="l00284"></a>00284 <span class="keywordflow">return</span> fabsf(a) &gt; tolerance;
338<a name="l00285"></a>00285 }
339<a name="l00286"></a>00286
340<a name="l00288"></a><a class="code" href="namespaceirr_1_1core.html#a3842b13dc7bd40f068cc8f7fd91bcfa5">00288</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#afc24e6ba26469ec7ca7001ed272dc3b2" title="returns if a equals zero, taking rounding errors into account">iszero</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> tolerance = 0)
341<a name="l00289"></a>00289 {
342<a name="l00290"></a>00290 <span class="keywordflow">return</span> ( a &amp; 0x7ffffff ) &lt;= tolerance;
343<a name="l00291"></a>00291 }
344<a name="l00292"></a>00292
345<a name="l00294"></a><a class="code" href="namespaceirr_1_1core.html#afa64d4495f986ec0fa840e61cba45c68">00294</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#afc24e6ba26469ec7ca7001ed272dc3b2" title="returns if a equals zero, taking rounding errors into account">iszero</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> tolerance = 0)
346<a name="l00295"></a>00295 {
347<a name="l00296"></a>00296 <span class="keywordflow">return</span> a &lt;= tolerance;
348<a name="l00297"></a>00297 }
349<a name="l00298"></a>00298
350<a name="l00299"></a>00299 <span class="preprocessor">#ifdef __IRR_HAS_S64</span>
351<a name="l00300"></a>00300 <span class="preprocessor"></span>
352<a name="l00301"></a><a class="code" href="namespaceirr_1_1core.html#a418bebacbef432fcf909e8f3d9b8368d">00301</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="namespaceirr_1_1core.html#afc24e6ba26469ec7ca7001ed272dc3b2" title="returns if a equals zero, taking rounding errors into account">iszero</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> tolerance = 0)
353<a name="l00302"></a>00302 {
354<a name="l00303"></a>00303 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#a2cab2ba5899c9262ca29501ea7551c91" title="returns abs of two values. Own implementation to get rid of STL (VS6 problems)">abs_</a>(a) &lt;= tolerance;
355<a name="l00304"></a>00304 }
356<a name="l00305"></a>00305 <span class="preprocessor">#endif</span>
357<a name="l00306"></a>00306 <span class="preprocessor"></span>
358<a name="l00307"></a><a class="code" href="namespaceirr_1_1core.html#aa0d9ebcfeca532643e76cf58b98daca1">00307</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#aa0d9ebcfeca532643e76cf58b98daca1">s32_min</a>(<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> a, <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> b)
359<a name="l00308"></a>00308 {
360<a name="l00309"></a>00309 <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> mask = (a - b) &gt;&gt; 31;
361<a name="l00310"></a>00310 <span class="keywordflow">return</span> (a &amp; mask) | (b &amp; ~mask);
362<a name="l00311"></a>00311 }
363<a name="l00312"></a>00312
364<a name="l00313"></a><a class="code" href="namespaceirr_1_1core.html#a3adbc0ee7f78051eb2a35511fe90bd2d">00313</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#a3adbc0ee7f78051eb2a35511fe90bd2d">s32_max</a>(<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> a, <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> b)
365<a name="l00314"></a>00314 {
366<a name="l00315"></a>00315 <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> mask = (a - b) &gt;&gt; 31;
367<a name="l00316"></a>00316 <span class="keywordflow">return</span> (b &amp; mask) | (a &amp; ~mask);
368<a name="l00317"></a>00317 }
369<a name="l00318"></a>00318
370<a name="l00319"></a><a class="code" href="namespaceirr_1_1core.html#aa7828c932a36c62a67fd0f2b972d8b21">00319</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#aa7828c932a36c62a67fd0f2b972d8b21">s32_clamp</a> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> value, <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> low, <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> high)
371<a name="l00320"></a>00320 {
372<a name="l00321"></a>00321 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#aa0d9ebcfeca532643e76cf58b98daca1">s32_min</a>(<a class="code" href="namespaceirr_1_1core.html#a3adbc0ee7f78051eb2a35511fe90bd2d">s32_max</a>(value,low), high);
373<a name="l00322"></a>00322 }
374<a name="l00323"></a>00323
375<a name="l00324"></a>00324 <span class="comment">/*</span>
376<a name="l00325"></a>00325 <span class="comment"> float IEEE-754 bit represenation</span>
377<a name="l00326"></a>00326 <span class="comment"></span>
378<a name="l00327"></a>00327 <span class="comment"> 0 0x00000000</span>
379<a name="l00328"></a>00328 <span class="comment"> 1.0 0x3f800000</span>
380<a name="l00329"></a>00329 <span class="comment"> 0.5 0x3f000000</span>
381<a name="l00330"></a>00330 <span class="comment"> 3 0x40400000</span>
382<a name="l00331"></a>00331 <span class="comment"> +inf 0x7f800000</span>
383<a name="l00332"></a>00332 <span class="comment"> -inf 0xff800000</span>
384<a name="l00333"></a>00333 <span class="comment"> +NaN 0x7fc00000 or 0x7ff00000</span>
385<a name="l00334"></a>00334 <span class="comment"> in general: number = (sign ? -1:1) * 2^(exponent) * 1.(mantissa bits)</span>
386<a name="l00335"></a>00335 <span class="comment"> */</span>
387<a name="l00336"></a>00336
388<a name="l00337"></a><a class="code" href="unionirr_1_1core_1_1inttofloat.html#a87651356c7436ac7755e85189412f75a">00337</a> <span class="keyword">typedef</span> <span class="keyword">union </span>{ <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="unionirr_1_1core_1_1inttofloat.html#a87651356c7436ac7755e85189412f75a">u</a>; <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> s; <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> f; } <a class="code" href="unionirr_1_1core_1_1inttofloat.html">inttofloat</a>;
389<a name="l00338"></a>00338
390<a name="l00339"></a><a class="code" href="irr_math_8h.html#afc4f1a86cb2a79c560b29ee5edd0f94d">00339</a> <span class="preprocessor"> #define F32_AS_S32(f) (*((s32 *) &amp;(f)))</span>
391<a name="l00340"></a><a class="code" href="irr_math_8h.html#afdeb4b30296d2b1dccec72427bdb39f2">00340</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_AS_U32(f) (*((u32 *) &amp;(f)))</span>
392<a name="l00341"></a><a class="code" href="irr_math_8h.html#ab5498fea750901e87dfeca4e27425f16">00341</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_AS_U32_POINTER(f) ( ((u32 *) &amp;(f)))</span>
393<a name="l00342"></a>00342 <span class="preprocessor"></span>
394<a name="l00343"></a><a class="code" href="irr_math_8h.html#aff2ace8fbd4b2ee6833ae0ed8dd9469a">00343</a> <span class="preprocessor"> #define F32_VALUE_0 0x00000000</span>
395<a name="l00344"></a><a class="code" href="irr_math_8h.html#a93465b810662025b38f42244b100fc2e">00344</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_VALUE_1 0x3f800000</span>
396<a name="l00345"></a><a class="code" href="irr_math_8h.html#a58566d4b084b3c9740b3215cf7a607bb">00345</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_SIGN_BIT 0x80000000U</span>
397<a name="l00346"></a><a class="code" href="irr_math_8h.html#a94abc82f2a2794c8331c9dad9a06958b">00346</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_EXPON_MANTISSA 0x7FFFFFFFU</span>
398<a name="l00347"></a>00347 <span class="preprocessor"></span>
399<a name="l00350"></a>00350 <span class="preprocessor">#ifdef IRRLICHT_FAST_MATH</span>
400<a name="l00351"></a>00351 <span class="preprocessor"></span><span class="preprocessor"> #define IR(x) ((u32&amp;)(x))</span>
401<a name="l00352"></a>00352 <span class="preprocessor"></span><span class="preprocessor">#else</span>
402<a name="l00353"></a><a class="code" href="namespaceirr_1_1core.html#aff42ea2c4d80cb7b45b71d1f63c6a226">00353</a> <span class="preprocessor"></span> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#aff42ea2c4d80cb7b45b71d1f63c6a226">IR</a>(<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> x) {<a class="code" href="unionirr_1_1core_1_1inttofloat.html">inttofloat</a> tmp; tmp.<a class="code" href="unionirr_1_1core_1_1inttofloat.html#ab0dd36fa35cbb368602fa0d18b2d9788">f</a>=x; <span class="keywordflow">return</span> tmp.<a class="code" href="unionirr_1_1core_1_1inttofloat.html#a87651356c7436ac7755e85189412f75a">u</a>;}
403<a name="l00354"></a>00354 <span class="preprocessor">#endif</span>
404<a name="l00355"></a>00355 <span class="preprocessor"></span>
405<a name="l00357"></a><a class="code" href="irr_math_8h.html#aa854d8430e0acc31adb1ddb3647f6534">00357</a> <span class="preprocessor"> #define AIR(x) (IR(x)&amp;0x7fffffff)</span>
406<a name="l00358"></a>00358 <span class="preprocessor"></span>
407<a name="l00360"></a>00360 <span class="preprocessor">#ifdef IRRLICHT_FAST_MATH</span>
408<a name="l00361"></a>00361 <span class="preprocessor"></span><span class="preprocessor"> #define FR(x) ((f32&amp;)(x))</span>
409<a name="l00362"></a>00362 <span class="preprocessor"></span><span class="preprocessor">#else</span>
410<a name="l00363"></a><a class="code" href="namespaceirr_1_1core.html#ae0940bd4032e5f10cf83b460f73571a3">00363</a> <span class="preprocessor"></span> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#ae0940bd4032e5f10cf83b460f73571a3" title="Floating-point representation of an integer value.">FR</a>(<a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> x) {<a class="code" href="unionirr_1_1core_1_1inttofloat.html">inttofloat</a> tmp; tmp.<a class="code" href="unionirr_1_1core_1_1inttofloat.html#a87651356c7436ac7755e85189412f75a">u</a>=x; <span class="keywordflow">return</span> tmp.<a class="code" href="unionirr_1_1core_1_1inttofloat.html#ab0dd36fa35cbb368602fa0d18b2d9788">f</a>;}
411<a name="l00364"></a><a class="code" href="namespaceirr_1_1core.html#a10bf7ddf910b7feac9a36fd141a9f5ba">00364</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#ae0940bd4032e5f10cf83b460f73571a3" title="Floating-point representation of an integer value.">FR</a>(<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> x) {<a class="code" href="unionirr_1_1core_1_1inttofloat.html">inttofloat</a> tmp; tmp.<a class="code" href="unionirr_1_1core_1_1inttofloat.html#a1adc8b3417ac325bd9695c0cbb6c043e">s</a>=x; <span class="keywordflow">return</span> tmp.<a class="code" href="unionirr_1_1core_1_1inttofloat.html#ab0dd36fa35cbb368602fa0d18b2d9788">f</a>;}
412<a name="l00365"></a>00365 <span class="preprocessor">#endif</span>
413<a name="l00366"></a>00366 <span class="preprocessor"></span>
414<a name="l00368"></a><a class="code" href="irr_math_8h.html#a3ec4980c07f6b510c61230356e014d24">00368</a> <span class="preprocessor"> #define IEEE_1_0 0x3f800000</span>
415<a name="l00369"></a>00369 <span class="preprocessor"></span>
416<a name="l00370"></a><a class="code" href="irr_math_8h.html#a2b311316554140ac181c31d86f4f3786">00370</a> <span class="preprocessor"> #define IEEE_255_0 0x437f0000</span>
417<a name="l00371"></a>00371 <span class="preprocessor"></span>
418<a name="l00372"></a>00372 <span class="preprocessor">#ifdef IRRLICHT_FAST_MATH</span>
419<a name="l00373"></a>00373 <span class="preprocessor"></span><span class="preprocessor"> #define F32_LOWER_0(f) (F32_AS_U32(f) &gt; F32_SIGN_BIT)</span>
420<a name="l00374"></a>00374 <span class="preprocessor"></span><span class="preprocessor"> #define F32_LOWER_EQUAL_0(f) (F32_AS_S32(f) &lt;= F32_VALUE_0)</span>
421<a name="l00375"></a>00375 <span class="preprocessor"></span><span class="preprocessor"> #define F32_GREATER_0(f) (F32_AS_S32(f) &gt; F32_VALUE_0)</span>
422<a name="l00376"></a>00376 <span class="preprocessor"></span><span class="preprocessor"> #define F32_GREATER_EQUAL_0(f) (F32_AS_U32(f) &lt;= F32_SIGN_BIT)</span>
423<a name="l00377"></a>00377 <span class="preprocessor"></span><span class="preprocessor"> #define F32_EQUAL_1(f) (F32_AS_U32(f) == F32_VALUE_1)</span>
424<a name="l00378"></a>00378 <span class="preprocessor"></span><span class="preprocessor"> #define F32_EQUAL_0(f) ( (F32_AS_U32(f) &amp; F32_EXPON_MANTISSA ) == F32_VALUE_0)</span>
425<a name="l00379"></a>00379 <span class="preprocessor"></span>
426<a name="l00380"></a>00380 <span class="comment">// only same sign</span>
427<a name="l00381"></a>00381 <span class="preprocessor"> #define F32_A_GREATER_B(a,b) (F32_AS_S32((a)) &gt; F32_AS_S32((b)))</span>
428<a name="l00382"></a>00382 <span class="preprocessor"></span>
429<a name="l00383"></a>00383 <span class="preprocessor">#else</span>
430<a name="l00384"></a>00384 <span class="preprocessor"></span>
431<a name="l00385"></a><a class="code" href="irr_math_8h.html#aa86a7d03858f88ebbf9e36592583ced6">00385</a> <span class="preprocessor"> #define F32_LOWER_0(n) ((n) &lt; 0.0f)</span>
432<a name="l00386"></a><a class="code" href="irr_math_8h.html#a26bc42a9cc1fc775bc588052c32ff9a0">00386</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_LOWER_EQUAL_0(n) ((n) &lt;= 0.0f)</span>
433<a name="l00387"></a><a class="code" href="irr_math_8h.html#a2fdc9e94ce29e1866ddf64e5903d43a1">00387</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_GREATER_0(n) ((n) &gt; 0.0f)</span>
434<a name="l00388"></a><a class="code" href="irr_math_8h.html#a407afe61680cc405bbe04922d36423af">00388</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_GREATER_EQUAL_0(n) ((n) &gt;= 0.0f)</span>
435<a name="l00389"></a><a class="code" href="irr_math_8h.html#ae907baf637203996fb3187581c2def80">00389</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_EQUAL_1(n) ((n) == 1.0f)</span>
436<a name="l00390"></a><a class="code" href="irr_math_8h.html#a3c82a09fb606a67c19514b534d364d6c">00390</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_EQUAL_0(n) ((n) == 0.0f)</span>
437<a name="l00391"></a><a class="code" href="irr_math_8h.html#ab4092d1d22af18e03372117e347b633c">00391</a> <span class="preprocessor"></span><span class="preprocessor"> #define F32_A_GREATER_B(a,b) ((a) &gt; (b))</span>
438<a name="l00392"></a>00392 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
439<a name="l00393"></a>00393 <span class="preprocessor"></span>
440<a name="l00394"></a>00394
441<a name="l00395"></a>00395 <span class="preprocessor">#ifndef REALINLINE</span>
442<a name="l00396"></a>00396 <span class="preprocessor"></span><span class="preprocessor"> #ifdef _MSC_VER</span>
443<a name="l00397"></a>00397 <span class="preprocessor"></span><span class="preprocessor"> #define REALINLINE __forceinline</span>
444<a name="l00398"></a>00398 <span class="preprocessor"></span><span class="preprocessor"> #else</span>
445<a name="l00399"></a><a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">00399</a> <span class="preprocessor"></span><span class="preprocessor"> #define REALINLINE inline</span>
446<a name="l00400"></a>00400 <span class="preprocessor"></span><span class="preprocessor"> #endif</span>
447<a name="l00401"></a>00401 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
448<a name="l00402"></a>00402 <span class="preprocessor"></span>
449<a name="l00403"></a>00403 <span class="preprocessor">#if defined(__BORLANDC__) || defined (__BCPLUSPLUS__)</span>
450<a name="l00404"></a>00404 <span class="preprocessor"></span>
451<a name="l00405"></a>00405 <span class="comment">// 8-bit bools in borland builder</span>
452<a name="l00406"></a>00406
453<a name="l00408"></a>00408 <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#ad6426246733e5dc16713f43352d85cdb" title="conditional set based on mask and arithmetic shift">if_c_a_else_b</a> ( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a9395eaea339bcb546b319e9c96bf7410" title="8 bit character variable.">c8</a> condition, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> b )
454<a name="l00409"></a>00409 {
455<a name="l00410"></a>00410 <span class="keywordflow">return</span> ( ( -condition &gt;&gt; 7 ) &amp; ( a ^ b ) ) ^ b;
456<a name="l00411"></a>00411 }
457<a name="l00412"></a>00412
458<a name="l00414"></a>00414 <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#af19c13d0084052f12357308c0cd83005" title="conditional set based on mask and arithmetic shift">if_c_a_else_0</a> ( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a9395eaea339bcb546b319e9c96bf7410" title="8 bit character variable.">c8</a> condition, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> a )
459<a name="l00415"></a>00415 {
460<a name="l00416"></a>00416 <span class="keywordflow">return</span> ( -condition &gt;&gt; 31 ) &amp; a;
461<a name="l00417"></a>00417 }
462<a name="l00418"></a>00418 <span class="preprocessor">#else</span>
463<a name="l00419"></a>00419 <span class="preprocessor"></span>
464<a name="l00421"></a><a class="code" href="namespaceirr_1_1core.html#ad6426246733e5dc16713f43352d85cdb">00421</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#ad6426246733e5dc16713f43352d85cdb" title="conditional set based on mask and arithmetic shift">if_c_a_else_b</a> ( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> condition, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> b )
465<a name="l00422"></a>00422 {
466<a name="l00423"></a>00423 <span class="keywordflow">return</span> ( ( -condition &gt;&gt; 31 ) &amp; ( a ^ b ) ) ^ b;
467<a name="l00424"></a>00424 }
468<a name="l00425"></a>00425
469<a name="l00427"></a><a class="code" href="namespaceirr_1_1core.html#af1ec8eb919fdb81c259920cce4004329">00427</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#ae9f8ec82692ad3b83c21f555bfa70bcc" title="16 bit unsigned variable.">u16</a> <a class="code" href="namespaceirr_1_1core.html#ad6426246733e5dc16713f43352d85cdb" title="conditional set based on mask and arithmetic shift">if_c_a_else_b</a> ( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a43ace0af066371ac0862bac3f7314220" title="16 bit signed variable.">s16</a> condition, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ae9f8ec82692ad3b83c21f555bfa70bcc" title="16 bit unsigned variable.">u16</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ae9f8ec82692ad3b83c21f555bfa70bcc" title="16 bit unsigned variable.">u16</a> b )
470<a name="l00428"></a>00428 {
471<a name="l00429"></a>00429 <span class="keywordflow">return</span> ( ( -condition &gt;&gt; 15 ) &amp; ( a ^ b ) ) ^ b;
472<a name="l00430"></a>00430 }
473<a name="l00431"></a>00431
474<a name="l00433"></a><a class="code" href="namespaceirr_1_1core.html#af19c13d0084052f12357308c0cd83005">00433</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#af19c13d0084052f12357308c0cd83005" title="conditional set based on mask and arithmetic shift">if_c_a_else_0</a> ( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> condition, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> a )
475<a name="l00434"></a>00434 {
476<a name="l00435"></a>00435 <span class="keywordflow">return</span> ( -condition &gt;&gt; 31 ) &amp; a;
477<a name="l00436"></a>00436 }
478<a name="l00437"></a>00437 <span class="preprocessor">#endif</span>
479<a name="l00438"></a>00438 <span class="preprocessor"></span>
480<a name="l00439"></a>00439 <span class="comment">/*</span>
481<a name="l00440"></a>00440 <span class="comment"> if (condition) state |= m; else state &amp;= ~m;</span>
482<a name="l00441"></a>00441 <span class="comment"> */</span>
483<a name="l00442"></a><a class="code" href="namespaceirr_1_1core.html#a628051738e8873b91b064e6014024f41">00442</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <span class="keywordtype">void</span> <a class="code" href="namespaceirr_1_1core.html#a628051738e8873b91b064e6014024f41">setbit_cond</a> ( <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> &amp;state, <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> condition, <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> mask )
484<a name="l00443"></a>00443 {
485<a name="l00444"></a>00444 <span class="comment">// 0, or any postive to mask</span>
486<a name="l00445"></a>00445 <span class="comment">//s32 conmask = -condition &gt;&gt; 31;</span>
487<a name="l00446"></a>00446 state ^= ( ( -condition &gt;&gt; 31 ) ^ state ) &amp; mask;
488<a name="l00447"></a>00447 }
489<a name="l00448"></a>00448
490<a name="l00449"></a><a class="code" href="namespaceirr_1_1core.html#a894a901069c34298987761c5f3d74f1f">00449</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a894a901069c34298987761c5f3d74f1f">round_</a>( <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> x )
491<a name="l00450"></a>00450 {
492<a name="l00451"></a>00451 <span class="keywordflow">return</span> floorf( x + 0.5f );
493<a name="l00452"></a>00452 }
494<a name="l00453"></a>00453
495<a name="l00454"></a><a class="code" href="namespaceirr_1_1core.html#ab4c17ceae6e2b96383e842eabb9596ab">00454</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <span class="keywordtype">void</span> <a class="code" href="namespaceirr_1_1core.html#ab4c17ceae6e2b96383e842eabb9596ab">clearFPUException</a> ()
496<a name="l00455"></a>00455 {
497<a name="l00456"></a>00456 <span class="preprocessor">#ifdef IRRLICHT_FAST_MATH</span>
498<a name="l00457"></a>00457 <span class="preprocessor"></span> <span class="keywordflow">return</span>;
499<a name="l00458"></a>00458 <span class="preprocessor">#ifdef feclearexcept</span>
500<a name="l00459"></a>00459 <span class="preprocessor"></span> feclearexcept(FE_ALL_EXCEPT);
501<a name="l00460"></a>00460 <span class="preprocessor">#elif defined(_MSC_VER)</span>
502<a name="l00461"></a>00461 <span class="preprocessor"></span> __asm fnclex;
503<a name="l00462"></a>00462 <span class="preprocessor">#elif defined(__GNUC__) &amp;&amp; defined(__x86__)</span>
504<a name="l00463"></a>00463 <span class="preprocessor"></span> __asm__ __volatile__ (<span class="stringliteral">&quot;fclex \n\t&quot;</span>);
505<a name="l00464"></a>00464 <span class="preprocessor">#else</span>
506<a name="l00465"></a>00465 <span class="preprocessor"></span><span class="preprocessor"># warn clearFPUException not supported.</span>
507<a name="l00466"></a>00466 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
508<a name="l00467"></a>00467 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
509<a name="l00468"></a>00468 <span class="preprocessor"></span> }
510<a name="l00469"></a>00469
511<a name="l00470"></a>00470 <span class="comment">// calculate: sqrt ( x )</span>
512<a name="l00471"></a><a class="code" href="namespaceirr_1_1core.html#af2f378cc34a19f5da6fe1d4961646d1d">00471</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#af2f378cc34a19f5da6fe1d4961646d1d">squareroot</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> f)
513<a name="l00472"></a>00472 {
514<a name="l00473"></a>00473 <span class="keywordflow">return</span> sqrtf(f);
515<a name="l00474"></a>00474 }
516<a name="l00475"></a>00475
517<a name="l00476"></a>00476 <span class="comment">// calculate: sqrt ( x )</span>
518<a name="l00477"></a><a class="code" href="namespaceirr_1_1core.html#ad4378f076bf251c05e543ce888da8f48">00477</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#af2f378cc34a19f5da6fe1d4961646d1d">squareroot</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> f)
519<a name="l00478"></a>00478 {
520<a name="l00479"></a>00479 <span class="keywordflow">return</span> sqrt(f);
521<a name="l00480"></a>00480 }
522<a name="l00481"></a>00481
523<a name="l00482"></a>00482 <span class="comment">// calculate: sqrt ( x )</span>
524<a name="l00483"></a><a class="code" href="namespaceirr_1_1core.html#a6943186698de9d2ff47ce03fbe025230">00483</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#af2f378cc34a19f5da6fe1d4961646d1d">squareroot</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> f)
525<a name="l00484"></a>00484 {
526<a name="l00485"></a>00485 <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a><span class="keyword">&gt;</span>(<a class="code" href="namespaceirr_1_1core.html#af2f378cc34a19f5da6fe1d4961646d1d">squareroot</a>(static_cast&lt;f32&gt;(f)));
527<a name="l00486"></a>00486 }
528<a name="l00487"></a>00487
529<a name="l00488"></a>00488 <span class="preprocessor">#ifdef __IRR_HAS_S64</span>
530<a name="l00489"></a>00489 <span class="preprocessor"></span> <span class="comment">// calculate: sqrt ( x )</span>
531<a name="l00490"></a><a class="code" href="namespaceirr_1_1core.html#a9a79fc4c36183e75d70c740b2b9f1865">00490</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> <a class="code" href="namespaceirr_1_1core.html#af2f378cc34a19f5da6fe1d4961646d1d">squareroot</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a> f)
532<a name="l00491"></a>00491 {
533<a name="l00492"></a>00492 <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><a class="code" href="namespaceirr.html#abf54bd535f8d4dd996270e68c3ad8c08" title="64 bit signed variable.">s64</a><span class="keyword">&gt;</span>(<a class="code" href="namespaceirr_1_1core.html#af2f378cc34a19f5da6fe1d4961646d1d">squareroot</a>(static_cast&lt;f64&gt;(f)));
534<a name="l00493"></a>00493 }
535<a name="l00494"></a>00494 <span class="preprocessor">#endif</span>
536<a name="l00495"></a>00495 <span class="preprocessor"></span>
537<a name="l00496"></a>00496 <span class="comment">// calculate: 1 / sqrt ( x )</span>
538<a name="l00497"></a><a class="code" href="namespaceirr_1_1core.html#adaef309f12c2a3386e94610e24f2bfa7">00497</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#adaef309f12c2a3386e94610e24f2bfa7">reciprocal_squareroot</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> x)
539<a name="l00498"></a>00498 {
540<a name="l00499"></a>00499 <span class="keywordflow">return</span> 1.0 / sqrt(x);
541<a name="l00500"></a>00500 }
542<a name="l00501"></a>00501
543<a name="l00502"></a>00502 <span class="comment">// calculate: 1 / sqrtf ( x )</span>
544<a name="l00503"></a><a class="code" href="namespaceirr_1_1core.html#a42eb747bb19d6ca2cb9d8977eb402c72">00503</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#adaef309f12c2a3386e94610e24f2bfa7">reciprocal_squareroot</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> f)
545<a name="l00504"></a>00504 {
546<a name="l00505"></a>00505 <span class="preprocessor">#if defined ( IRRLICHT_FAST_MATH )</span>
547<a name="l00506"></a>00506 <span class="preprocessor"></span><span class="preprocessor"> #if defined(_MSC_VER)</span>
548<a name="l00507"></a>00507 <span class="preprocessor"></span> <span class="comment">// SSE reciprocal square root estimate, accurate to 12 significant</span>
549<a name="l00508"></a>00508 <span class="comment">// bits of the mantissa</span>
550<a name="l00509"></a>00509 <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> recsqrt;
551<a name="l00510"></a>00510 __asm rsqrtss xmm0, f <span class="comment">// xmm0 = rsqrtss(f)</span>
552<a name="l00511"></a>00511 __asm movss recsqrt, xmm0 <span class="comment">// return xmm0</span>
553<a name="l00512"></a>00512 <span class="keywordflow">return</span> recsqrt;
554<a name="l00513"></a>00513
555<a name="l00514"></a>00514 <span class="comment">/*</span>
556<a name="l00515"></a>00515 <span class="comment"> // comes from Nvidia</span>
557<a name="l00516"></a>00516 <span class="comment"> u32 tmp = (u32(IEEE_1_0 &lt;&lt; 1) + IEEE_1_0 - *(u32*)&amp;x) &gt;&gt; 1;</span>
558<a name="l00517"></a>00517 <span class="comment"> f32 y = *(f32*)&amp;tmp;</span>
559<a name="l00518"></a>00518 <span class="comment"> return y * (1.47f - 0.47f * x * y * y);</span>
560<a name="l00519"></a>00519 <span class="comment">*/</span>
561<a name="l00520"></a>00520 <span class="preprocessor"> #else</span>
562<a name="l00521"></a>00521 <span class="preprocessor"></span> <span class="keywordflow">return</span> 1.f / sqrtf(f);
563<a name="l00522"></a>00522 <span class="preprocessor"> #endif</span>
564<a name="l00523"></a>00523 <span class="preprocessor"></span><span class="preprocessor">#else // no fast math</span>
565<a name="l00524"></a>00524 <span class="preprocessor"></span> <span class="keywordflow">return</span> 1.f / sqrtf(f);
566<a name="l00525"></a>00525 <span class="preprocessor">#endif</span>
567<a name="l00526"></a>00526 <span class="preprocessor"></span> }
568<a name="l00527"></a>00527
569<a name="l00528"></a>00528 <span class="comment">// calculate: 1 / sqrtf( x )</span>
570<a name="l00529"></a><a class="code" href="namespaceirr_1_1core.html#a21c37238a7754b48ff18c486202a1e4b">00529</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#adaef309f12c2a3386e94610e24f2bfa7">reciprocal_squareroot</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> x)
571<a name="l00530"></a>00530 {
572<a name="l00531"></a>00531 <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a><span class="keyword">&gt;</span>(<a class="code" href="namespaceirr_1_1core.html#adaef309f12c2a3386e94610e24f2bfa7">reciprocal_squareroot</a>(static_cast&lt;f32&gt;(x)));
573<a name="l00532"></a>00532 }
574<a name="l00533"></a>00533
575<a name="l00534"></a>00534 <span class="comment">// calculate: 1 / x</span>
576<a name="l00535"></a><a class="code" href="namespaceirr_1_1core.html#aa01390f49052dfe07e16ee6c5233f4eb">00535</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#aa01390f49052dfe07e16ee6c5233f4eb">reciprocal</a>( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> f )
577<a name="l00536"></a>00536 {
578<a name="l00537"></a>00537 <span class="preprocessor">#if defined (IRRLICHT_FAST_MATH)</span>
579<a name="l00538"></a>00538 <span class="preprocessor"></span>
580<a name="l00539"></a>00539 <span class="comment">// SSE Newton-Raphson reciprocal estimate, accurate to 23 significant</span>
581<a name="l00540"></a>00540 <span class="comment">// bi ts of the mantissa</span>
582<a name="l00541"></a>00541 <span class="comment">// One Newtown-Raphson Iteration:</span>
583<a name="l00542"></a>00542 <span class="comment">// f(i+1) = 2 * rcpss(f) - f * rcpss(f) * rcpss(f)</span>
584<a name="l00543"></a>00543 <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> rec;
585<a name="l00544"></a>00544 __asm rcpss xmm0, f <span class="comment">// xmm0 = rcpss(f)</span>
586<a name="l00545"></a>00545 __asm movss xmm1, f <span class="comment">// xmm1 = f</span>
587<a name="l00546"></a>00546 __asm mulss xmm1, xmm0 <span class="comment">// xmm1 = f * rcpss(f)</span>
588<a name="l00547"></a>00547 __asm mulss xmm1, xmm0 <span class="comment">// xmm2 = f * rcpss(f) * rcpss(f)</span>
589<a name="l00548"></a>00548 __asm addss xmm0, xmm0 <span class="comment">// xmm0 = 2 * rcpss(f)</span>
590<a name="l00549"></a>00549 __asm subss xmm0, xmm1 <span class="comment">// xmm0 = 2 * rcpss(f)</span>
591<a name="l00550"></a>00550 <span class="comment">// - f * rcpss(f) * rcpss(f)</span>
592<a name="l00551"></a>00551 __asm movss rec, xmm0 <span class="comment">// return xmm0</span>
593<a name="l00552"></a>00552 <span class="keywordflow">return</span> rec;
594<a name="l00553"></a>00553
595<a name="l00554"></a>00554
596<a name="l00556"></a>00556 <span class="comment">// instead set f to a high value to get a return value near zero..</span>
597<a name="l00557"></a>00557 <span class="comment">// -1000000000000.f.. is use minus to stay negative..</span>
598<a name="l00558"></a>00558 <span class="comment">// must test&#39;s here (plane.normal dot anything ) checks on &lt;= 0.f</span>
599<a name="l00559"></a>00559 <span class="comment">//u32 x = (-(AIR(f) != 0 ) &gt;&gt; 31 ) &amp; ( IR(f) ^ 0xd368d4a5 ) ^ 0xd368d4a5;</span>
600<a name="l00560"></a>00560 <span class="comment">//return 1.f / FR ( x );</span>
601<a name="l00561"></a>00561
602<a name="l00562"></a>00562 <span class="preprocessor">#else // no fast math</span>
603<a name="l00563"></a>00563 <span class="preprocessor"></span> <span class="keywordflow">return</span> 1.f / f;
604<a name="l00564"></a>00564 <span class="preprocessor">#endif</span>
605<a name="l00565"></a>00565 <span class="preprocessor"></span> }
606<a name="l00566"></a>00566
607<a name="l00567"></a>00567 <span class="comment">// calculate: 1 / x</span>
608<a name="l00568"></a><a class="code" href="namespaceirr_1_1core.html#ac4402e2ec5b151212168736b8cfdd587">00568</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> <a class="code" href="namespaceirr_1_1core.html#aa01390f49052dfe07e16ee6c5233f4eb">reciprocal</a> ( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a1325b02603ad449f92c68fc640af9b28" title="64 bit floating point variable.">f64</a> f )
609<a name="l00569"></a>00569 {
610<a name="l00570"></a>00570 <span class="keywordflow">return</span> 1.0 / f;
611<a name="l00571"></a>00571 }
612<a name="l00572"></a>00572
613<a name="l00573"></a>00573
614<a name="l00574"></a>00574 <span class="comment">// calculate: 1 / x, low precision allowed</span>
615<a name="l00575"></a><a class="code" href="namespaceirr_1_1core.html#ab5de17006aac4618e43d5f816ffc97c9">00575</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#ab5de17006aac4618e43d5f816ffc97c9">reciprocal_approxim</a> ( <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> f )
616<a name="l00576"></a>00576 {
617<a name="l00577"></a>00577 <span class="preprocessor">#if defined( IRRLICHT_FAST_MATH)</span>
618<a name="l00578"></a>00578 <span class="preprocessor"></span>
619<a name="l00579"></a>00579 <span class="comment">// SSE Newton-Raphson reciprocal estimate, accurate to 23 significant</span>
620<a name="l00580"></a>00580 <span class="comment">// bi ts of the mantissa</span>
621<a name="l00581"></a>00581 <span class="comment">// One Newtown-Raphson Iteration:</span>
622<a name="l00582"></a>00582 <span class="comment">// f(i+1) = 2 * rcpss(f) - f * rcpss(f) * rcpss(f)</span>
623<a name="l00583"></a>00583 <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> rec;
624<a name="l00584"></a>00584 __asm rcpss xmm0, f <span class="comment">// xmm0 = rcpss(f)</span>
625<a name="l00585"></a>00585 __asm movss xmm1, f <span class="comment">// xmm1 = f</span>
626<a name="l00586"></a>00586 __asm mulss xmm1, xmm0 <span class="comment">// xmm1 = f * rcpss(f)</span>
627<a name="l00587"></a>00587 __asm mulss xmm1, xmm0 <span class="comment">// xmm2 = f * rcpss(f) * rcpss(f)</span>
628<a name="l00588"></a>00588 __asm addss xmm0, xmm0 <span class="comment">// xmm0 = 2 * rcpss(f)</span>
629<a name="l00589"></a>00589 __asm subss xmm0, xmm1 <span class="comment">// xmm0 = 2 * rcpss(f)</span>
630<a name="l00590"></a>00590 <span class="comment">// - f * rcpss(f) * rcpss(f)</span>
631<a name="l00591"></a>00591 __asm movss rec, xmm0 <span class="comment">// return xmm0</span>
632<a name="l00592"></a>00592 <span class="keywordflow">return</span> rec;
633<a name="l00593"></a>00593
634<a name="l00594"></a>00594
635<a name="l00595"></a>00595 <span class="comment">/*</span>
636<a name="l00596"></a>00596 <span class="comment"> // SSE reciprocal estimate, accurate to 12 significant bits of</span>
637<a name="l00597"></a>00597 <span class="comment"> f32 rec;</span>
638<a name="l00598"></a>00598 <span class="comment"> __asm rcpss xmm0, f // xmm0 = rcpss(f)</span>
639<a name="l00599"></a>00599 <span class="comment"> __asm movss rec , xmm0 // return xmm0</span>
640<a name="l00600"></a>00600 <span class="comment"> return rec;</span>
641<a name="l00601"></a>00601 <span class="comment">*/</span>
642<a name="l00602"></a>00602 <span class="comment">/*</span>
643<a name="l00603"></a>00603 <span class="comment"> register u32 x = 0x7F000000 - IR ( p );</span>
644<a name="l00604"></a>00604 <span class="comment"> const f32 r = FR ( x );</span>
645<a name="l00605"></a>00605 <span class="comment"> return r * (2.0f - p * r);</span>
646<a name="l00606"></a>00606 <span class="comment">*/</span>
647<a name="l00607"></a>00607 <span class="preprocessor">#else // no fast math</span>
648<a name="l00608"></a>00608 <span class="preprocessor"></span> <span class="keywordflow">return</span> 1.f / f;
649<a name="l00609"></a>00609 <span class="preprocessor">#endif</span>
650<a name="l00610"></a>00610 <span class="preprocessor"></span> }
651<a name="l00611"></a>00611
652<a name="l00612"></a>00612
653<a name="l00613"></a><a class="code" href="namespaceirr_1_1core.html#ac230a392b15e3d27c6e2a07a6925a8c4">00613</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#ac230a392b15e3d27c6e2a07a6925a8c4">floor32</a>(<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> x)
654<a name="l00614"></a>00614 {
655<a name="l00615"></a>00615 <span class="preprocessor">#ifdef IRRLICHT_FAST_MATH</span>
656<a name="l00616"></a>00616 <span class="preprocessor"></span> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> h = 0.5f;
657<a name="l00617"></a>00617
658<a name="l00618"></a>00618 <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> t;
659<a name="l00619"></a>00619
660<a name="l00620"></a>00620 <span class="preprocessor">#if defined(_MSC_VER)</span>
661<a name="l00621"></a>00621 <span class="preprocessor"></span> __asm
662<a name="l00622"></a>00622 {
663<a name="l00623"></a>00623 fld x
664<a name="l00624"></a>00624 fsub h
665<a name="l00625"></a>00625 fistp t
666<a name="l00626"></a>00626 }
667<a name="l00627"></a>00627 <span class="preprocessor">#elif defined(__GNUC__)</span>
668<a name="l00628"></a>00628 <span class="preprocessor"></span> __asm__ __volatile__ (
669<a name="l00629"></a>00629 <span class="stringliteral">&quot;fsub %2 \n\t&quot;</span>
670<a name="l00630"></a>00630 <span class="stringliteral">&quot;fistpl %0&quot;</span>
671<a name="l00631"></a>00631 : <span class="stringliteral">&quot;=m&quot;</span> (t)
672<a name="l00632"></a>00632 : <span class="stringliteral">&quot;t&quot;</span> (x), <span class="stringliteral">&quot;f&quot;</span> (h)
673<a name="l00633"></a>00633 : <span class="stringliteral">&quot;st&quot;</span>
674<a name="l00634"></a>00634 );
675<a name="l00635"></a>00635 <span class="preprocessor">#else</span>
676<a name="l00636"></a>00636 <span class="preprocessor"></span><span class="preprocessor"># warn IRRLICHT_FAST_MATH not supported.</span>
677<a name="l00637"></a>00637 <span class="preprocessor"></span> <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>) floorf ( x );
678<a name="l00638"></a>00638 <span class="preprocessor">#endif</span>
679<a name="l00639"></a>00639 <span class="preprocessor"></span> <span class="keywordflow">return</span> t;
680<a name="l00640"></a>00640 <span class="preprocessor">#else // no fast math</span>
681<a name="l00641"></a>00641 <span class="preprocessor"></span> <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>) floorf ( x );
682<a name="l00642"></a>00642 <span class="preprocessor">#endif</span>
683<a name="l00643"></a>00643 <span class="preprocessor"></span> }
684<a name="l00644"></a>00644
685<a name="l00645"></a>00645
686<a name="l00646"></a><a class="code" href="namespaceirr_1_1core.html#a0fb8b4d0f177af411fdd4bd94b6779ce">00646</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#a0fb8b4d0f177af411fdd4bd94b6779ce">ceil32</a> ( <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> x )
687<a name="l00647"></a>00647 {
688<a name="l00648"></a>00648 <span class="preprocessor">#ifdef IRRLICHT_FAST_MATH</span>
689<a name="l00649"></a>00649 <span class="preprocessor"></span> <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> h = 0.5f;
690<a name="l00650"></a>00650
691<a name="l00651"></a>00651 <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> t;
692<a name="l00652"></a>00652
693<a name="l00653"></a>00653 <span class="preprocessor">#if defined(_MSC_VER)</span>
694<a name="l00654"></a>00654 <span class="preprocessor"></span> __asm
695<a name="l00655"></a>00655 {
696<a name="l00656"></a>00656 fld x
697<a name="l00657"></a>00657 fadd h
698<a name="l00658"></a>00658 fistp t
699<a name="l00659"></a>00659 }
700<a name="l00660"></a>00660 <span class="preprocessor">#elif defined(__GNUC__)</span>
701<a name="l00661"></a>00661 <span class="preprocessor"></span> __asm__ __volatile__ (
702<a name="l00662"></a>00662 <span class="stringliteral">&quot;fadd %2 \n\t&quot;</span>
703<a name="l00663"></a>00663 <span class="stringliteral">&quot;fistpl %0 \n\t&quot;</span>
704<a name="l00664"></a>00664 : <span class="stringliteral">&quot;=m&quot;</span>(t)
705<a name="l00665"></a>00665 : <span class="stringliteral">&quot;t&quot;</span>(x), <span class="stringliteral">&quot;f&quot;</span>(h)
706<a name="l00666"></a>00666 : <span class="stringliteral">&quot;st&quot;</span>
707<a name="l00667"></a>00667 );
708<a name="l00668"></a>00668 <span class="preprocessor">#else</span>
709<a name="l00669"></a>00669 <span class="preprocessor"></span><span class="preprocessor"># warn IRRLICHT_FAST_MATH not supported.</span>
710<a name="l00670"></a>00670 <span class="preprocessor"></span> <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>) ceilf ( x );
711<a name="l00671"></a>00671 <span class="preprocessor">#endif</span>
712<a name="l00672"></a>00672 <span class="preprocessor"></span> <span class="keywordflow">return</span> t;
713<a name="l00673"></a>00673 <span class="preprocessor">#else // not fast math</span>
714<a name="l00674"></a>00674 <span class="preprocessor"></span> <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>) ceilf ( x );
715<a name="l00675"></a>00675 <span class="preprocessor">#endif</span>
716<a name="l00676"></a>00676 <span class="preprocessor"></span> }
717<a name="l00677"></a>00677
718<a name="l00678"></a>00678
719<a name="l00679"></a>00679
720<a name="l00680"></a><a class="code" href="namespaceirr_1_1core.html#ae46f57f03e9033c57c180fbe83b04cf2">00680</a> <a class="code" href="irr_math_8h.html#a3695e51e0a187a6c49684ba3206b0d0a">REALINLINE</a> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#ae46f57f03e9033c57c180fbe83b04cf2">round32</a>(<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> x)
721<a name="l00681"></a>00681 {
722<a name="l00682"></a>00682 <span class="preprocessor">#if defined(IRRLICHT_FAST_MATH)</span>
723<a name="l00683"></a>00683 <span class="preprocessor"></span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> t;
724<a name="l00684"></a>00684
725<a name="l00685"></a>00685 <span class="preprocessor">#if defined(_MSC_VER)</span>
726<a name="l00686"></a>00686 <span class="preprocessor"></span> __asm
727<a name="l00687"></a>00687 {
728<a name="l00688"></a>00688 fld x
729<a name="l00689"></a>00689 fistp t
730<a name="l00690"></a>00690 }
731<a name="l00691"></a>00691 <span class="preprocessor">#elif defined(__GNUC__)</span>
732<a name="l00692"></a>00692 <span class="preprocessor"></span> __asm__ __volatile__ (
733<a name="l00693"></a>00693 <span class="stringliteral">&quot;fistpl %0 \n\t&quot;</span>
734<a name="l00694"></a>00694 : <span class="stringliteral">&quot;=m&quot;</span>(t)
735<a name="l00695"></a>00695 : <span class="stringliteral">&quot;t&quot;</span>(x)
736<a name="l00696"></a>00696 : <span class="stringliteral">&quot;st&quot;</span>
737<a name="l00697"></a>00697 );
738<a name="l00698"></a>00698 <span class="preprocessor">#else</span>
739<a name="l00699"></a>00699 <span class="preprocessor"></span><span class="preprocessor"># warn IRRLICHT_FAST_MATH not supported.</span>
740<a name="l00700"></a>00700 <span class="preprocessor"></span> <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>) <a class="code" href="namespaceirr_1_1core.html#a894a901069c34298987761c5f3d74f1f">round_</a>(x);
741<a name="l00701"></a>00701 <span class="preprocessor">#endif</span>
742<a name="l00702"></a>00702 <span class="preprocessor"></span> <span class="keywordflow">return</span> t;
743<a name="l00703"></a>00703 <span class="preprocessor">#else // no fast math</span>
744<a name="l00704"></a>00704 <span class="preprocessor"></span> <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>) <a class="code" href="namespaceirr_1_1core.html#a894a901069c34298987761c5f3d74f1f">round_</a>(x);
745<a name="l00705"></a>00705 <span class="preprocessor">#endif</span>
746<a name="l00706"></a>00706 <span class="preprocessor"></span> }
747<a name="l00707"></a>00707
748<a name="l00708"></a><a class="code" href="namespaceirr_1_1core.html#a944684da42c3118ebe85ec9c3f77c331">00708</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a944684da42c3118ebe85ec9c3f77c331">f32_max3</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> c)
749<a name="l00709"></a>00709 {
750<a name="l00710"></a>00710 <span class="keywordflow">return</span> a &gt; b ? (a &gt; c ? a : c) : (b &gt; c ? b : c);
751<a name="l00711"></a>00711 }
752<a name="l00712"></a>00712
753<a name="l00713"></a><a class="code" href="namespaceirr_1_1core.html#a8d7bec533c867b22d0e870236ecf4bad">00713</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a8d7bec533c867b22d0e870236ecf4bad">f32_min3</a>(<span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> a, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> b, <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> c)
754<a name="l00714"></a>00714 {
755<a name="l00715"></a>00715 <span class="keywordflow">return</span> a &lt; b ? (a &lt; c ? a : c) : (b &lt; c ? b : c);
756<a name="l00716"></a>00716 }
757<a name="l00717"></a>00717
758<a name="l00718"></a><a class="code" href="namespaceirr_1_1core.html#adf530866e57502da85e6a1f0c23932a2">00718</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#adf530866e57502da85e6a1f0c23932a2">fract</a> ( <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> x )
759<a name="l00719"></a>00719 {
760<a name="l00720"></a>00720 <span class="keywordflow">return</span> x - floorf ( x );
761<a name="l00721"></a>00721 }
762<a name="l00722"></a>00722
763<a name="l00723"></a>00723 } <span class="comment">// end namespace core</span>
764<a name="l00724"></a>00724 } <span class="comment">// end namespace irr</span>
765<a name="l00725"></a>00725
766<a name="l00726"></a>00726 <span class="preprocessor">#ifndef IRRLICHT_FAST_MATH</span>
767<a name="l00727"></a>00727 <span class="preprocessor"></span> <span class="keyword">using</span> <a class="code" href="namespaceirr_1_1core.html#aff42ea2c4d80cb7b45b71d1f63c6a226">irr::core::IR</a>;
768<a name="l00728"></a>00728 <span class="keyword">using</span> <a class="code" href="namespaceirr_1_1core.html#ae0940bd4032e5f10cf83b460f73571a3" title="Floating-point representation of an integer value.">irr::core::FR</a>;
769<a name="l00729"></a>00729 <span class="preprocessor">#endif</span>
770<a name="l00730"></a>00730 <span class="preprocessor"></span>
771<a name="l00731"></a>00731 <span class="preprocessor">#endif</span>
772<a name="l00732"></a>00732 <span class="preprocessor"></span>
773</pre></div></div>
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