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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 <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>
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