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<hr><h1>landscape_collision_grid.cpp</h1><a href="landscape__collision__grid_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="landscape__collision__grid_8h.html">3d/landscape_collision_grid.h</a>"</font>
00029 <font class="preprocessor">#include &lt;algorithm&gt;</font>
00030 
00031 
00032 <font class="keyword">using</font> <font class="keyword">namespace </font>std;
00033 <font class="keyword">using</font> <font class="keyword">namespace </font>NLMISC;
00034 
00035 <font class="keyword">namespace </font>NL3D 
00036 {
00037 
00038 
00039 <font class="comment">// ***************************************************************************</font>
<a name="l00040"></a><a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#a0">00040</a> CLandscapeCollisionGrid::CLandscapeCollisionGrid(CVisualCollisionManager *owner)
00041 {
00042         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o0">_Owner</a>= owner;
00043         <font class="comment">// reset list to NULL.</font>
00044         memset(<a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o2">_Grid</a>, 0, <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>*<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a> * <font class="keyword">sizeof</font>(CVisualTileDescNode*));
00045         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o1">_Cleared</a>= <font class="keyword">true</font>;
00046 
00047         <font class="comment">// sizepower.</font>
00048         <a class="code" href="debug_8h.html#a6">nlassert</a>(<a class="code" href="namespaceNLMISC.html#a225">isPowerOf2</a>(<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>));
00049         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o3">_SizePower</a>= <a class="code" href="namespaceNLMISC.html#a224">getPowerOf2</a>(<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>);
00050 }
00051 
00052 <font class="comment">// ***************************************************************************</font>
<a name="l00053"></a><a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#a1">00053</a> CLandscapeCollisionGrid::~CLandscapeCollisionGrid()
00054 {
00055         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#a2">clear</a>();
00056 }
00057 
00058 <font class="comment">// ***************************************************************************</font>
<a name="l00059"></a><a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#a2">00059</a> <font class="keywordtype">void</font>                    CLandscapeCollisionGrid::clear()
00060 {
00061         <font class="comment">// already cleared? do nothing.</font>
00062         <font class="keywordflow">if</font>(_Cleared)
00063                 <font class="keywordflow">return</font>;
00064 
00065         <font class="comment">// Parse all quads.</font>
00066         sint    i;
00067         <font class="keywordflow">for</font>(i=0;i&lt;<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>*<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>;i++)
00068         {
00069                 CVisualTileDescNode                     *ptr, *next;
00070                 ptr= <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o2">_Grid</a>[i];
00071 
00072                 <font class="comment">// delete list of node.</font>
00073                 <font class="keywordflow">while</font>(ptr)
00074                 {
00075                         next= ptr-&gt;Next;
00076                         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o0">_Owner</a>-&gt;deleteVisualTileDescNode(ptr);
00077                         ptr= next;
00078                 }
00079 
00080                 <font class="comment">// reset root.</font>
00081                 <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o2">_Grid</a>[i]= NULL;
00082         }
00083 
00084         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o1">_Cleared</a>= <font class="keyword">true</font>;
00085 }
00086 
00087 
00088 <font class="comment">// ***************************************************************************</font>
<a name="l00089"></a><a class="code" href="structNL3D_1_1CVector2i.html">00089</a> <font class="keyword">struct  </font>CVector2i
00090 {
<a name="l00091"></a><a class="code" href="structNL3D_1_1CVector2i.html#m1">00091</a>         sint    <a class="code" href="structNL3D_1_1CVector2i.html#m0">x</a>,<a class="code" href="structNL3D_1_1CVector2i.html#m1">y</a>;
00092 
00093 };
00094 
00095 
00096 <font class="comment">// ***************************************************************************</font>
00097 <font class="comment">// fastFloor function.</font>
00098 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
00099 <font class="preprocessor"></font>
00100 <font class="comment">// The magic constant value. support both positive and negative numbers.</font>
00101 <font class="keyword">static</font> <font class="keywordtype">double</font>   FastFloorMagicConst=pow(2,52)+pow(2,51);
00102 <font class="keyword">static</font> uint             FastFloorBkupCW;
00103 <font class="comment">// init float CW.</font>
00104 <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">void</font>  <a class="code" href="namespaceNL3D.html#a372">fastFloorBegin</a>()
00105 {
00106         FastFloorBkupCW= _controlfp(0, 0);
00107         _controlfp( _RC_DOWN|_PC_53, _MCW_RC|_MCW_PC );
00108 }
00109 
00110 <font class="comment">// reset float CW.</font>
00111 <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">void</font>  <a class="code" href="namespaceNL3D.html#a373">fastFloorEnd</a>()
00112 {
00113         _controlfp(FastFloorBkupCW, _MCW_RC|_MCW_PC);
00114 }
00115 
00116 <font class="comment">// Force __stdcall to not pass parameters in registers.</font>
00117 <font class="keyword">static</font> <font class="keyword">inline</font> sint __stdcall <a class="code" href="namespaceNL3D.html#a374">fastFloor</a>(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>)
00118 {
00119         sint32  QWord[2];
00120         sint32  *Qw=QWord;
00121         sint32  <a class="code" href="driver__opengl__extension__def_8h.html#a400">res</a>;
00122         __asm
00123         {
00124                 fld             <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>
00125                 fadd    FastFloorMagicConst
00126                 mov             ebx,Qw
00127                 fstp    qword ptr [ebx]
00128                 mov             eax,dword ptr [ebx]
00129                 mov             <a class="code" href="driver__opengl__extension__def_8h.html#a400">res</a>, eax
00130         }
00131 
00132         <font class="keywordflow">return</font> <a class="code" href="driver__opengl__extension__def_8h.html#a400">res</a>;
00133 }
00134 
00135 <font class="preprocessor">#else</font>
00136 <font class="preprocessor"></font><font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">void</font>  <a class="code" href="namespaceNL3D.html#a372">fastFloorBegin</a>() {}
00137 <font class="keyword">static</font> <font class="keyword">inline</font> <font class="keywordtype">void</font>  <a class="code" href="namespaceNL3D.html#a373">fastFloorEnd</a>() {}
00138 <font class="keyword">static</font> <font class="keyword">inline</font> sint <a class="code" href="namespaceNL3D.html#a374">fastFloor</a>(<font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>)
00139 {
00140         <font class="keywordflow">return</font> (sint)floor(<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>);
00141 }
00142 <font class="preprocessor">#endif</font>
00143 <font class="preprocessor"></font>
00144 
00145 
00146 <font class="comment">// ***************************************************************************</font>
<a name="l00147"></a><a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#a3">00147</a> <font class="keywordtype">void</font>                    CLandscapeCollisionGrid::build(<font class="keyword">const</font> std::vector&lt;CPatchQuadBlock*&gt;      &amp;quadBlocks, <font class="keyword">const</font> CVector &amp;delta)
00148 {
00149         sint    <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>,<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>;
00150         <font class="keyword">static</font> CVector2i        floorVals[<a class="code" href="patch_8h.html#a10">NL_PATCH_BLOCK_MAX_VERTEX</a>*<a class="code" href="patch_8h.html#a10">NL_PATCH_BLOCK_MAX_VERTEX</a>];
00151 
00152         <font class="comment">// first clear</font>
00153         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#a2">clear</a>();
00154 
00155         <font class="comment">// init for fast floor.</font>
00156         <a class="code" href="namespaceNL3D.html#a372">fastFloorBegin</a>();
00157 
00158         <font class="comment">// then fill.</font>
00159         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o1">_Cleared</a>= <font class="keyword">false</font>;
00160         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o4">_Delta</a>= delta;
00161         <font class="comment">// parse all quad blocks.</font>
00162         <font class="keywordflow">for</font>(sint i=0; i&lt;(sint)quadBlocks.size();i++)
00163         {
00164                 CPatchQuadBlock         &amp;qb= *quadBlocks[i];
00165                 sint            lenS= qb.PatchBlockId.S1 - qb.PatchBlockId.S0;
00166                 sint            lenT= qb.PatchBlockId.T1 - qb.PatchBlockId.T0;
00167 
00168                 <font class="comment">// First, floor all vertices of interest.</font>
00169                 <font class="keywordflow">for</font>(<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>=0; <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>&lt;lenT+1; <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>++)
00170                 {
00171                         <font class="keywordflow">for</font>(<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>=0; <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>&lt;lenS+1; <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>++)
00172                         {
00173                                 sint    <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>= <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>*<a class="code" href="patch_8h.html#a10">NL_PATCH_BLOCK_MAX_VERTEX</a> + <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>;
00174                                 <font class="comment">// Add delta, and floor to sint.</font>
00175                                 floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].x= <a class="code" href="namespaceNL3D.html#a374">fastFloor</a>(qb.Vertices[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].x + delta.x);
00176                                 floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].y= <a class="code" href="namespaceNL3D.html#a374">fastFloor</a>(qb.Vertices[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].y + delta.y);
00177                         }
00178                 }
00179 
00180                 <font class="comment">// Then compute min max for all quads, and insert quad id in the quadGrid.</font>
00181                 <font class="keywordflow">for</font>(<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>=0; <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>&lt;lenT; <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>++)
00182                 {
00183                         <font class="keywordflow">for</font>(<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>=0; <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>&lt;lenS; <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>++)
00184                         {
00185                                 sint    minx, maxx, miny, maxy;
00186                                 sint    <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>= <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>*<a class="code" href="patch_8h.html#a10">NL_PATCH_BLOCK_MAX_VERTEX</a> + <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>;
00187                                 <font class="comment">// Compute min max of the 4 vertices.</font>
00188                                 minx= floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].x; maxx= floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].x;
00189                                 miny= floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].y; maxy= floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].y;
00190                                 <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>++;
00191                                 minx= <a class="code" href="bit__set_8cpp.html#a0">min</a>(minx, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>); maxx= max(maxx, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>);
00192                                 miny= <a class="code" href="bit__set_8cpp.html#a0">min</a>(miny, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>); maxy= max(maxy, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>);
00193                                 <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>+= <a class="code" href="patch_8h.html#a10">NL_PATCH_BLOCK_MAX_VERTEX</a>;
00194                                 minx= <a class="code" href="bit__set_8cpp.html#a0">min</a>(minx, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>); maxx= max(maxx, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>);
00195                                 miny= <a class="code" href="bit__set_8cpp.html#a0">min</a>(miny, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>); maxy= max(maxy, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>);
00196                                 <a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>--;
00197                                 minx= <a class="code" href="bit__set_8cpp.html#a0">min</a>(minx, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>); maxx= max(maxx, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>);
00198                                 miny= <a class="code" href="bit__set_8cpp.html#a0">min</a>(miny, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>); maxy= max(maxy, floorVals[<a class="code" href="driver__opengl__extension__def_8h.html#a356">id</a>].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>);
00199 
00200                                 <font class="comment">// store minmax in the quad.</font>
00201                                 sint    quadId= <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>*<a class="code" href="patch_8h.html#a9">NL_PATCH_BLOCK_MAX_QUAD</a> + <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>;
00202                                 <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#c0">addQuadToGrid</a>(i, quadId, minx, maxx, miny, maxy);
00203                         }
00204                 }
00205         }
00206 
00207         <font class="comment">// init for fast floor.</font>
00208         <a class="code" href="namespaceNL3D.html#a373">fastFloorEnd</a>();
00209 }
00210 
00211 
00212 <font class="comment">// ***************************************************************************</font>
<a name="l00213"></a><a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#c0">00213</a> <font class="keywordtype">void</font>                    CLandscapeCollisionGrid::addQuadToGrid(uint16 paBlockId, uint16 quadId, sint x0, sint x1, sint y0, sint y1)
00214 {
00215         <font class="comment">// coordinate should be positive.</font>
00216         <a class="code" href="debug_8h.html#a6">nlassert</a>(x0&gt;=0 &amp;&amp; x1&gt;=x0);
00217         <a class="code" href="debug_8h.html#a6">nlassert</a>(y0&gt;=0 &amp;&amp; y1&gt;=y0);
00218 
00219         <font class="comment">// first, transform coordinate (in meters) in quadgrid eltSize (ie 2 meters).</font>
00220         x0= (x0&gt;&gt;1);            <font class="comment">// floor().</font>
00221         x1= (x1&gt;&gt;1) + 1;        <font class="comment">// equivalent of ceil().</font>
00222         y0= (y0&gt;&gt;1);            <font class="comment">// floor().</font>
00223         y1= (y1&gt;&gt;1) + 1;        <font class="comment">// equivalent of ceil().</font>
00224 
00225         <font class="comment">// setup bounds in quadgrid coordinate.</font>
00226         <font class="keywordflow">if</font>(x1-x0&gt;=<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>)
00227                 x0=0, x1= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>;
00228         <font class="keywordflow">else</font>
00229         {
00230                 x0&amp;= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1;
00231                 x1&amp;= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1;
00232                 <font class="keywordflow">if</font>(x1&lt;=x0)
00233                         x1+=<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>;
00234         }
00235         <font class="keywordflow">if</font>(y1-y0&gt;=<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>)
00236                 y0=0, y1= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>;
00237         <font class="keywordflow">else</font>
00238         {
00239                 y0&amp;= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1;
00240                 y1&amp;= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1;
00241                 <font class="keywordflow">if</font>(y1&lt;=y0)
00242                         y1+=<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>;
00243         }
00244 
00245         <font class="comment">// fill all cases with element.</font>
00246         sint    <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>,<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>;
00247         <font class="keywordflow">for</font>(<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>= y0;<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>&lt;y1;<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>++)
00248         {
00249                 sint    xe,ye;
00250                 ye= <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a> &amp;(<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1);
00251                 <font class="keywordflow">for</font>(<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>= x0;<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>&lt;x1;<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>++)
00252                 {
00253                         xe= <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a> &amp;(<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1);
00254                         <font class="comment">// which case we add the element.</font>
00255                         sint gridId= (ye&lt;&lt;<a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o3">_SizePower</a>)+xe;
00256 
00257                         <font class="comment">// allocate element.</font>
00258                         CVisualTileDescNode             *elt= <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o0">_Owner</a>-&gt;newVisualTileDescNode();
00259 
00260                         <font class="comment">// fill elt.</font>
00261                         elt-&gt;PatchQuadBlocId= paBlockId;
00262                         elt-&gt;QuadId= quadId;
00263 
00264                         <font class="comment">// bind elt to the list.</font>
00265                         elt-&gt;Next= <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o2">_Grid</a>[gridId];
00266                         <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o2">_Grid</a>[gridId]= elt;
00267                 }
00268         }
00269 }
00270 
00271 
00272 <font class="comment">// ***************************************************************************</font>
<a name="l00273"></a><a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#a4">00273</a> CVisualTileDescNode                     *CLandscapeCollisionGrid::select(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CVector.html">NLMISC::CVector</a> &amp;pos)
00274 {
00275         <font class="comment">// compute pos in the quadgrid.</font>
00276         CVector         localPos;
00277         localPos= pos + <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o4">_Delta</a>;
00278         <font class="comment">// cases are 2x2 meters.</font>
00279         localPos/=2;
00280 
00281         <font class="comment">// floor, bound in quadgrid coordinate.</font>
00282         sint    <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>,<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>;
00283         <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>= (sint)floor(localPos.x);
00284         <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>= (sint)floor(localPos.y);
00285         <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>&amp;= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1;
00286         <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>&amp;= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1;
00287 
00288         <font class="keywordflow">return</font> <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o2">_Grid</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>*<a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>+<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>];
00289 }
00290 
00291 
00292 
00293 } <font class="comment">// NL3D</font>
</pre></div>

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