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authorneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
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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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