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authorneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
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+<hr><h1>frustum.cpp</h1><a href="frustum_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
+00007 <font class="comment">/* Copyright, 2000 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="frustum_8h.html">nel/3d/frustum.h</a>"</font>
+00029 <font class="preprocessor">#include "<a class="code" href="matrix_8h.html">nel/misc/matrix.h</a>"</font>
+00030 <font class="preprocessor">#include &lt;math.h&gt;</font>
+00031
+00032
+00033 <font class="keyword">using</font> <font class="keyword">namespace </font>NLMISC;
+00034
+00035 <font class="keyword">namespace </font>NL3D
+00036 {
+00037
+00038
+<a name="l00039"></a><a class="code" href="classNL3D_1_1CFrustum.html#a2">00039</a> <font class="keywordtype">void</font> CFrustum::init(<font class="keywordtype">float</font> left, <font class="keywordtype">float</font> right, <font class="keywordtype">float</font> bottom, <font class="keywordtype">float</font> top, <font class="keywordtype">float</font> znear, <font class="keywordtype">float</font> zfar, <font class="keywordtype">bool</font> perspective)
+00040 {
+00041 <a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>= left;
+00042 <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>= right;
+00043 <a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>= bottom;
+00044 <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>= top;
+00045 <a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>= znear;
+00046 <a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>= zfar;
+00047 <a class="code" href="classNL3D_1_1CFrustum.html#m6">Perspective</a>= perspective;
+00048 }
+00049
+<a name="l00050"></a><a class="code" href="classNL3D_1_1CFrustum.html#a3">00050</a> <font class="keywordtype">void</font> CFrustum::init(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a266">width</a>, <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a267">height</a>, <font class="keywordtype">float</font> znear, <font class="keywordtype">float</font> zfar, <font class="keywordtype">bool</font> perspective)
+00051 {
+00052 <a class="code" href="classNL3D_1_1CFrustum.html#a2">init</a>(-<a class="code" href="driver__opengl__extension__def_8h.html#a266">width</a>/2, <a class="code" href="driver__opengl__extension__def_8h.html#a266">width</a>/2, -<a class="code" href="driver__opengl__extension__def_8h.html#a267">height</a>/2, <a class="code" href="driver__opengl__extension__def_8h.html#a267">height</a>/2, znear, zfar, perspective);
+00053 }
+<a name="l00054"></a><a class="code" href="classNL3D_1_1CFrustum.html#a4">00054</a> <font class="keywordtype">void</font> CFrustum::initPerspective(<font class="keywordtype">float</font> fov, <font class="keywordtype">float</font> aspectRatio, <font class="keywordtype">float</font> znear, <font class="keywordtype">float</font> zfar)
+00055 {
+00056 <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>,h;
+00057 <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>= 2*znear*(float)tan(fov/2);
+00058 h= <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>/aspectRatio;
+00059 <a class="code" href="classNL3D_1_1CFrustum.html#a2">init</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>,h,znear,zfar,<font class="keyword">true</font>);
+00060 }
+<a name="l00061"></a><a class="code" href="classNL3D_1_1CFrustum.html#a5">00061</a> <font class="keywordtype">void</font> CFrustum::getValues(<font class="keywordtype">float</font> &amp;left, <font class="keywordtype">float</font> &amp;right, <font class="keywordtype">float</font> &amp;bottom, <font class="keywordtype">float</font> &amp;top, <font class="keywordtype">float</font> &amp;znear, <font class="keywordtype">float</font> &amp;zfar)<font class="keyword"> const</font>
+00062 <font class="keyword"></font>{
+00063 left= <a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>;
+00064 right= <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>;
+00065 bottom= <a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>;
+00066 top= <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>;
+00067 znear= <a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>;
+00068 zfar= <a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>;
+00069 }
+00070
+00071
+00072 <font class="comment">// ***************************************************************************</font>
+<a name="l00073"></a><a class="code" href="classNL3D_1_1CFrustum.html#a6">00073</a> CVector CFrustum::project(<font class="keyword">const</font> CVector &amp;vec)<font class="keyword"> const</font>
+00074 <font class="keyword"></font>{
+00075 CVector ret;
+00076 <font class="keywordtype">float</font> decalX, decalY;
+00077 <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>, h;
+00078 <font class="keywordtype">float</font> OOw, OOh;
+00079
+00080 <font class="comment">// Fast transform to openGL like axis.</font>
+00081 CVector pt;
+00082 pt.x= vec.x;
+00083 pt.y= vec.z;
+00084 pt.z= -vec.y;
+00085
+00086 decalX= (<a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>);
+00087 decalY= (<a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>);
+00088 <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>= <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>;
+00089 h= <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>;
+00090 OOw= 1.0f/<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>;
+00091 OOh= 1.0f/h;
+00092
+00093 <font class="comment">// project to -1..+1.</font>
+00094 <font class="keywordflow">if</font>(Perspective)
+00095 {
+00096 ret.x= (2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>*pt.x + decalX*pt.z)*OOw;
+00097 ret.x/= -pt.z;
+00098 ret.y= (2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>*pt.y + decalY*pt.z)*OOh;
+00099 ret.y/= -pt.z;
+00100 }
+00101 <font class="keywordflow">else</font>
+00102 {
+00103 ret.x= (2*pt.x-decalX)*OOw;
+00104 ret.y= (2*pt.y-decalY)*OOh;
+00105 }
+00106
+00107
+00108 <font class="comment">// Map it to 0..1.</font>
+00109 ret.x= 0.5f*(ret.x+1);
+00110 ret.y= 0.5f*(ret.y+1);
+00111 ret.z= 0;
+00112
+00113 <font class="keywordflow">return</font> ret;
+00114 }
+00115
+00116
+00117
+00118 <font class="comment">// ***************************************************************************</font>
+<a name="l00119"></a><a class="code" href="classNL3D_1_1CFrustum.html#a7">00119</a> CVector CFrustum::unProject(<font class="keyword">const</font> CVector &amp;vec)<font class="keyword"> const</font>
+00120 <font class="keyword"></font>{
+00121 CVector ret;
+00122 <font class="keywordtype">float</font> decalX, decalY;
+00123 <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>, h;
+00124 <font class="keywordtype">float</font> OOw, OOh;
+00125
+00126 decalX= (<a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>);
+00127 decalY= (<a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>+<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>);
+00128 <a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>= <a class="code" href="classNL3D_1_1CFrustum.html#m1">Right</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m0">Left</a>;
+00129 h= <a class="code" href="classNL3D_1_1CFrustum.html#m3">Top</a>-<a class="code" href="classNL3D_1_1CFrustum.html#m2">Bottom</a>;
+00130 OOw= 1.0f/<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>;
+00131 OOh= 1.0f/h;
+00132
+00133 <font class="comment">// vec is a vector in a left hand axis.</font>
+00134 CVector pt;
+00135 pt.x= vec.x;
+00136 pt.y= vec.y;
+00137 pt.z= vec.z;
+00138
+00139 <font class="comment">// Map it to -1..1</font>
+00140 pt.x= 2*(pt.x-0.5f);
+00141 pt.y= 2*(pt.y-0.5f);
+00142
+00143 <font class="comment">// Map Z to Near..Far.</font>
+00144 <font class="comment">// Z IN is 1/Z, and is in 0..1.</font>
+00145 <font class="comment">// inverse to 1..0.</font>
+00146 pt.z= 1-pt.z;
+00147 <font class="comment">// Map ret.z to 1/Far..1/Near.</font>
+00148 pt.z= 1/<a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>+(1/<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>-1/<a class="code" href="classNL3D_1_1CFrustum.html#m5">Far</a>)*pt.z;
+00149 <font class="comment">// Inverse, so ret.z E Near..Far.</font>
+00150 pt.z= 1/pt.z;
+00151 <font class="comment">// Actually, pt.z==w, homogenous coordinate.</font>
+00152
+00153
+00154 <font class="comment">// unproject</font>
+00155 <font class="keywordflow">if</font>(Perspective)
+00156 {
+00157 <font class="comment">// w of homogenous coordinate.</font>
+00158 <font class="keywordtype">float</font> Wh;
+00159 <font class="keywordtype">float</font> Zin;
+00160 Wh= pt.z;
+00161 Zin= -pt.z;
+00162
+00163 <font class="comment">// unproject. (Projection is: x'= x/w. y'= y/w).</font>
+00164 pt.x= pt.x*Wh;
+00165 pt.y= pt.y*Wh;
+00166 ret.x= (pt.x*<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>-decalX*Zin)/(2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>);
+00167 ret.y= (pt.y*<a class="code" href="driver__opengl__extension__def_8h.html#a245">w</a>-decalY*Zin)/(2*<a class="code" href="classNL3D_1_1CFrustum.html#m4">Near</a>);
+00168 ret.z= Zin;
+00169 }
+00170 <font class="keywordflow">else</font>
+00171 {
+00172 <font class="comment">// NOT DONE YET.</font>
+00173 <a class="code" href="debug_8h.html#a12">nlstop</a>;
+00174 <font class="comment">/*ret.x= (pt.x*w+decalX)/2;</font>
+00175 <font class="comment"> ret.y= (pt.y*h+decalY)/2;</font>
+00176 <font class="comment"> */</font>
+00177 }
+00178
+00179 <font class="comment">// Fast transform from openGL like axis.</font>
+00180 pt =ret;
+00181 ret.x= pt.x;
+00182 ret.y= -pt.z;
+00183 ret.z= pt.y;
+00184
+00185 <font class="keywordflow">return</font> ret;
+00186 }
+00187
+00188
+00189
+00190 } <font class="comment">// NL3D</font>
+</pre></div>
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