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<hr><h1>light.cpp</h1><a href="light_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 
00007 <font class="comment">/* Copyright, 2001 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025 
00026 <font class="preprocessor">#include "<a class="code" href="std3d_8h.html">std3d.h</a>"</font>
00027 
00028 <font class="preprocessor">#include "<a class="code" href="light_8h.html">3d/light.h</a>"</font>
00029 
00030 <font class="keyword">using</font> <font class="keyword">namespace </font>NLMISC;
00031 
00032 <font class="keyword">namespace </font>NL3D 
00033 {
00034 
00035 <font class="comment">// ***************************************************************************</font>
00036 
<a name="l00037"></a><a class="code" href="classNL3D_1_1CLight.html#z496_0">00037</a> <font class="keywordtype">void</font> CLight::setupDirectional (<font class="keyword">const</font> CRGBA&amp; ambiant, <font class="keyword">const</font> CRGBA&amp; diffuse, <font class="keyword">const</font> CRGBA&amp; specular, <font class="keyword">const</font> CVector&amp; direction,
00038                                                            <font class="keywordtype">float</font> constant, <font class="keywordtype">float</font> linear, <font class="keywordtype">float</font> quadratic)
00039 {
00040         <font class="comment">// Set the mode</font>
00041         <a class="code" href="classNL3D_1_1CLight.html#z497_0">setMode</a> (<a class="code" href="classNL3D_1_1CLight.html#s3s0">DirectionalLight</a>);
00042 
00043         <font class="comment">// Set the colors</font>
00044         <a class="code" href="classNL3D_1_1CLight.html#z497_1">setAmbiant</a> (ambiant);
00045         <a class="code" href="classNL3D_1_1CLight.html#z497_2">setDiffuse</a> (diffuse);
00046         <a class="code" href="classNL3D_1_1CLight.html#z497_3">setSpecular</a> (specular);
00047 
00048         <font class="comment">// Set the direction</font>
00049         <a class="code" href="classNL3D_1_1CLight.html#z497_5">setDirection</a> (direction);
00050 
00051         <font class="comment">// Set attenuation</font>
00052         <a class="code" href="classNL3D_1_1CLight.html#z497_8">setConstantAttenuation</a> (constant);
00053         <a class="code" href="classNL3D_1_1CLight.html#z497_9">setLinearAttenuation</a> (linear);
00054         <a class="code" href="classNL3D_1_1CLight.html#z497_10">setQuadraticAttenuation</a> (quadratic);
00055 }
00056         
00057 <font class="comment">// ***************************************************************************</font>
00058 
<a name="l00059"></a><a class="code" href="classNL3D_1_1CLight.html#z496_1">00059</a> <font class="keywordtype">void</font> CLight::setupPointLight (<font class="keyword">const</font> CRGBA&amp; ambiant, <font class="keyword">const</font> CRGBA&amp; diffuse, <font class="keyword">const</font> CRGBA&amp; specular, <font class="keyword">const</font> CVector&amp; position, 
00060                                                 <font class="keyword">const</font> CVector&amp; direction, <font class="keywordtype">float</font> constant, <font class="keywordtype">float</font> linear, <font class="keywordtype">float</font> quadratic)
00061 {
00062         <font class="comment">// Set the mode</font>
00063         <a class="code" href="classNL3D_1_1CLight.html#z497_0">setMode</a> (<a class="code" href="classNL3D_1_1CLight.html#s3s1">PointLight</a>);
00064 
00065         <font class="comment">// Set the colors</font>
00066         <a class="code" href="classNL3D_1_1CLight.html#z497_1">setAmbiant</a> (ambiant);
00067         <a class="code" href="classNL3D_1_1CLight.html#z497_2">setDiffuse</a> (diffuse);
00068         <a class="code" href="classNL3D_1_1CLight.html#z497_3">setSpecular</a> (specular);
00069 
00070         <font class="comment">// Set the position and direction</font>
00071         <a class="code" href="classNL3D_1_1CLight.html#z497_4">setPosition</a> (position);
00072         <a class="code" href="classNL3D_1_1CLight.html#z497_5">setDirection</a> (direction);
00073 
00074         <font class="comment">// Set attenuation</font>
00075         <a class="code" href="classNL3D_1_1CLight.html#z497_8">setConstantAttenuation</a> (constant);
00076         <a class="code" href="classNL3D_1_1CLight.html#z497_9">setLinearAttenuation</a> (linear);
00077         <a class="code" href="classNL3D_1_1CLight.html#z497_10">setQuadraticAttenuation</a> (quadratic);
00078 }
00079 
00080 <font class="comment">// ***************************************************************************</font>
00081 
<a name="l00082"></a><a class="code" href="classNL3D_1_1CLight.html#z496_2">00082</a> <font class="keywordtype">void</font> CLight::setupSpotLight (<font class="keyword">const</font> CRGBA&amp; ambiant, <font class="keyword">const</font> CRGBA&amp; diffuse, <font class="keyword">const</font> CRGBA&amp; specular, <font class="keyword">const</font> CVector&amp; position, 
00083                                                 <font class="keyword">const</font> CVector&amp; direction, <font class="keywordtype">float</font> exponent, <font class="keywordtype">float</font> cutoff, <font class="keywordtype">float</font> constant, <font class="keywordtype">float</font> linear, <font class="keywordtype">float</font> quadratic)
00084 {
00085         <font class="comment">// Set the mode</font>
00086         <a class="code" href="classNL3D_1_1CLight.html#z497_0">setMode</a> (<a class="code" href="classNL3D_1_1CLight.html#s3s2">SpotLight</a>);
00087 
00088         <font class="comment">// Set the colors</font>
00089         <a class="code" href="classNL3D_1_1CLight.html#z497_1">setAmbiant</a> (ambiant);
00090         <a class="code" href="classNL3D_1_1CLight.html#z497_2">setDiffuse</a> (diffuse);
00091         <a class="code" href="classNL3D_1_1CLight.html#z497_3">setSpecular</a> (specular);
00092 
00093         <font class="comment">// Set the position and direction</font>
00094         <a class="code" href="classNL3D_1_1CLight.html#z497_4">setPosition</a> (position);
00095         <a class="code" href="classNL3D_1_1CLight.html#z497_5">setDirection</a> (direction);
00096 
00097         <font class="comment">// Set spotlight parameters</font>
00098         <a class="code" href="classNL3D_1_1CLight.html#z497_6">setExponent</a> (exponent);
00099         <a class="code" href="classNL3D_1_1CLight.html#z497_7">setCutoff</a> (cutoff);
00100 
00101         <font class="comment">// Set attenuation</font>
00102         <a class="code" href="classNL3D_1_1CLight.html#z497_8">setConstantAttenuation</a> (constant);
00103         <a class="code" href="classNL3D_1_1CLight.html#z497_9">setLinearAttenuation</a> (linear);
00104         <a class="code" href="classNL3D_1_1CLight.html#z497_10">setQuadraticAttenuation</a> (quadratic);
00105 }
00106 
00107 <font class="comment">// ***************************************************************************</font>
00108 
<a name="l00109"></a><a class="code" href="classNL3D_1_1CLight.html#z496_3">00109</a> <font class="keywordtype">void</font> CLight::setupAttenuation (<font class="keywordtype">float</font> farAttenuationBegin, <font class="keywordtype">float</font> farAttenuationEnd)
00110 {
00111         <a class="code" href="classNL3D_1_1CLight.html#o8">_ConstantAttenuation</a>=1.f;
00112         <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>=(float)(0.1/(0.9*farAttenuationBegin*farAttenuationBegin));
00113         <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>=(float)(0.1/(0.9*farAttenuationBegin));
00114 
00115         <font class="comment">// blend factor</font>
00116         <font class="keywordtype">float</font> factor = (0.1f*<a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>*farAttenuationEnd-0.1f*<a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>*farAttenuationEnd*farAttenuationEnd);
00117 
00118         <font class="keywordflow">if</font> (factor == 0.0f)
00119                 factor = 0.0001f;
00120         factor = (0.9f-0.1f*<a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>*farAttenuationEnd*farAttenuationEnd)/factor;
00121 
00122         <font class="keywordflow">if</font> ((factor&lt;0.f)||(factor&gt;1.f))
00123         {
00124                 <font class="comment">// Better factor</font>
00125                 <font class="keywordtype">float</font> d0_1Lin=1.f / ( <a class="code" href="classNL3D_1_1CLight.html#o8">_ConstantAttenuation</a> + <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>*farAttenuationEnd );
00126                 <font class="keywordtype">float</font> d0_1Quad=1.f / ( <a class="code" href="classNL3D_1_1CLight.html#o8">_ConstantAttenuation</a> + <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>*farAttenuationEnd*farAttenuationEnd );
00127 
00128                 <font class="comment">// Better</font>
00129                 <font class="keywordflow">if</font> (fabs (d0_1Lin-0.1f)&lt;fabs (d0_1Quad-0.1f))
00130                         <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>=0.f;
00131                 <font class="keywordflow">else</font>
00132                         <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>=0.f;
00133         }
00134         <font class="keywordflow">else</font>
00135         {
00136                 <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>*=factor;
00137                 <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>*=(1.f-factor);
00138         }
00139 
00140 <font class="preprocessor">#ifdef NL_DEBUG</font>
00141 <font class="preprocessor"></font>        <font class="comment">// Should be near previous result</font>
00142         <font class="keywordtype">float</font> d1_0=1.f / ( <a class="code" href="classNL3D_1_1CLight.html#o8">_ConstantAttenuation</a> + <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>*0.f + <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>*0.f*0.f );
00143         <font class="keywordtype">float</font> d0_9=1.f / ( <a class="code" href="classNL3D_1_1CLight.html#o8">_ConstantAttenuation</a> + <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>*farAttenuationBegin + <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>*farAttenuationBegin*farAttenuationBegin );
00144         <font class="keywordtype">float</font> d0_1=1.f / ( <a class="code" href="classNL3D_1_1CLight.html#o8">_ConstantAttenuation</a> + <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>*farAttenuationEnd + <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>*farAttenuationEnd*farAttenuationEnd );
00145 <font class="preprocessor">#endif // NL_DEBUG*/</font>
00146 <font class="preprocessor"></font>}
00147 
00148 <font class="comment">// ***************************************************************************</font>
00149 
<a name="l00150"></a><a class="code" href="classNL3D_1_1CLight.html#z496_5">00150</a> <font class="keywordtype">void</font> CLight::setupSpotExponent (<font class="keywordtype">float</font> hotSpotAngle)
00151 {
00152         <font class="keywordtype">float</font> divid=(float)log (cos (hotSpotAngle));
00153         <font class="keywordflow">if</font> (divid==0.f)
00154                 divid=0.0001f;
00155         <a class="code" href="classNL3D_1_1CLight.html#z497_6">setExponent</a> ((<font class="keywordtype">float</font>)(log (0.9)/divid));
00156 }
00157 
00158 <font class="comment">// ***************************************************************************</font>
00159 
<a name="l00160"></a><a class="code" href="classNL3D_1_1CLight.html#z496_4">00160</a> <font class="keywordtype">void</font> CLight::setNoAttenuation ()
00161 {
00162         <a class="code" href="classNL3D_1_1CLight.html#o8">_ConstantAttenuation</a>=1.f;
00163         <a class="code" href="classNL3D_1_1CLight.html#o10">_QuadraticAttenuation</a>=0.f;
00164         <a class="code" href="classNL3D_1_1CLight.html#o9">_LinearAttenuation</a>=0.f;
00165 }
00166 
00167 <font class="comment">// ***************************************************************************</font>
00168 
00169 } <font class="comment">// NL3D</font>
</pre></div>

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