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class="qindex" href="pages.html">Related Pages</a> <a class="qindexRef" 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>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 <algorithm></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<<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->Next; +00076 <a class="code" href="classNL3D_1_1CLandscapeCollisionGrid.html#o0">_Owner</a>->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<CPatchQuadBlock*> &quadBlocks, <font class="keyword">const</font> CVector &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<(sint)quadBlocks.size();i++) +00163 { +00164 CPatchQuadBlock &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><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><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><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><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>=0 && x1>=x0); +00217 <a class="code" href="debug_8h.html#a6">nlassert</a>(y0>=0 && y1>=y0); +00218 +00219 <font class="comment">// first, transform coordinate (in meters) in quadgrid eltSize (ie 2 meters).</font> +00220 x0= (x0>>1); <font class="comment">// floor().</font> +00221 x1= (x1>>1) + 1; <font class="comment">// equivalent of ceil().</font> +00222 y0= (y0>>1); <font class="comment">// floor().</font> +00223 y1= (y1>>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>=<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&= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1; +00231 x1&= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1; +00232 <font class="keywordflow">if</font>(x1<=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>=<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&= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1; +00240 y1&= <a class="code" href="landscape__collision__grid_8h.html#a0">NL_COLGRID_SIZE</a>-1; +00241 <font class="keywordflow">if</font>(y1<=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><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> &(<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><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> &(<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<<<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>->newVisualTileDescNode(); +00259 +00260 <font class="comment">// fill elt.</font> +00261 elt->PatchQuadBlocId= paBlockId; +00262 elt->QuadId= quadId; +00263 +00264 <font class="comment">// bind elt to the list.</font> +00265 elt->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> &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>&= <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>&= <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> + +<!-- 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> |