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doxygen="_cgi:http://www.nevrax.org/cgi-bin/nel-search.cgi" href="http://www.nevrax.org/cgi-bin/nel-search.cgi">Search</a> </center> +<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> + +<!-- footer --> +<BR><FONT Size=+5> </FONT> +</TD> +<TD WIDTH=15><IMG SRC=http://www.nevrax.org/inc/img/pixel.gif WIDTH=15 HEIGHT=15 BORDER=0 ALT=""></TD> +</TR> +</TABLE> +</BODY> +</HTML> |