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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& ambiant, <font class="keyword">const</font> CRGBA& diffuse, <font class="keyword">const</font> CRGBA& specular, <font class="keyword">const</font> CVector& 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& ambiant, <font class="keyword">const</font> CRGBA& diffuse, <font class="keyword">const</font> CRGBA& specular, <font class="keyword">const</font> CVector& position,
00060 <font class="keyword">const</font> CVector& 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& ambiant, <font class="keyword">const</font> CRGBA& diffuse, <font class="keyword">const</font> CRGBA& specular, <font class="keyword">const</font> CVector& position,
00083 <font class="keyword">const</font> CVector& 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<0.f)||(factor>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)<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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