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<hr><h1>texture_bump.cpp</h1><a href="texture__bump_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 
00007 <font class="comment">/* Copyright, 2000, 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="texture__bump_8h.html">3d/texture_bump.h</a>"</font>
00029 
00030 
00031 <font class="keyword">namespace </font>NL3D {
00032 
00033 
00035 <font class="keyword">static</font> <font class="keywordtype">void</font> <a class="code" href="namespaceNL3D.html#a463">BuildDsDt</a>(uint32 *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, sint <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a>, sint <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>, uint16 *dest, <font class="keywordtype">bool</font> absolute)
00036 {       
00037 <font class="preprocessor">        #define GET_HGT(x, y) ((sint) ((src[(uint) (x) % width + ((uint) (y) % height) * width] &amp; 0x00ff00) &gt;&gt; 8))</font>
00038 <font class="preprocessor"></font>        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>;      
00039         <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; <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a>; ++<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>)
00040         {
00041                 <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; <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>; ++<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>)
00042                 {                       
00043                         sint off = <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> * <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a>;
00044                         sint16 ds = (sint16) (GET_HGT(<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a> + 1, <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>) - GET_HGT(<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a> - 1, <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>));
00045                         sint16 dt = (sint16) (GET_HGT(<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> + 1) - GET_HGT(<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> - 1));
00046 
00047                         <font class="keywordflow">if</font> (!absolute)
00048                         {
00049 
00050                                 dest[off] = (uint16) ((ds &amp; 0xff)  | ((dt &amp; 0xff) &lt;&lt; 8));               
00051                         }
00052                         <font class="keywordflow">else</font>
00053                         {
00054                                 dest[off] = (uint16) (abs(ds) |  (abs(dt) &lt;&lt; 8));
00055                         }
00056                 }
00057         }
00058 }
00059 
00061 <font class="keyword">static</font> <font class="keywordtype">float</font> <a class="code" href="namespaceNL3D.html#a464">NormalizeDsDt</a>(uint16 *<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, sint <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a>, sint <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>, <font class="keywordtype">bool</font> absolute)
00062 {
00063         <font class="keyword">const</font> uint size = <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a> * <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>;
00064         uint highestDelta = 0;
00065         uint k;
00066 
00068         <font class="keywordflow">if</font> (absolute)
00069         {
00070                 <font class="keywordflow">for</font> (k = 0; k &lt; size; ++k)
00071                 {
00072                         highestDelta = std::max(highestDelta, (uint) (<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &amp; 255));
00073                         highestDelta = std::max(highestDelta, (uint) <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &gt;&gt; 8);
00074                 }
00075 
00076                 <font class="keywordflow">if</font> (highestDelta == 0)
00077                 {
00078                         <font class="keywordflow">return</font> 1.f;
00079                 }
00080                 <font class="keywordtype">float</font> normalizationFactor = 255.f / highestDelta;
00081                 <font class="keywordflow">for</font> (k = 0; k &lt; size; ++k)
00082                 {
00083                         uint8 du = (uint8) ((uint) (<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &amp; 0xff) * normalizationFactor);
00084                         uint16 dv = (uint16) (((uint) <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &gt;&gt; 8) * normalizationFactor);
00085                         <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] = (uint16) du | (dv &lt;&lt; 8); 
00086                 }
00087                 <font class="keywordflow">return</font> 1.f / normalizationFactor;
00088         }
00089         <font class="keywordflow">else</font>
00090         {               
00091                 <font class="keywordflow">for</font> (k = 0; k &lt; size; ++k)
00092                 {
00093                         highestDelta = std::max(highestDelta, (uint) ::abs((sint) (sint8) (<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &amp; 255)));
00094                         highestDelta = std::max(highestDelta, (uint) ::abs((sint) (sint8) (<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &gt;&gt; 8)));                      
00095                 }
00096 
00097                 <font class="keywordflow">if</font> (highestDelta == 0)
00098                 {
00099                         <font class="keywordflow">return</font> 1.f;
00100                 }
00101                 <font class="keywordtype">float</font> normalizationFactor = 127.f / highestDelta;
00102                 <font class="keywordflow">for</font> (k = 0; k &lt; size; ++k)
00103                 {
00104                         <font class="keywordtype">float</font> fdu = (sint8) (<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &amp; 255) * normalizationFactor;
00105                         <font class="keywordtype">float</font> fdv = (sint8) (<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] &gt;&gt; 8) * normalizationFactor;
00106                         <a class="code" href="namespaceNLMISC.html#a215">NLMISC::clamp</a>(fdu, -128, 127);
00107                         <a class="code" href="namespaceNLMISC.html#a215">NLMISC::clamp</a>(fdv, -128, 127);
00108                         uint8 du = (uint8) (sint8) fdu;
00109                         uint8 dv = (uint8) (sint8) fdv;
00110                         <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>[k] = (uint16) du | (((uint16) dv) &lt;&lt; 8); 
00111                 }
00112                 <font class="keywordflow">return</font> 1.f / normalizationFactor;
00113         }
00114 }
00115 
00116 
00117 
00118 <font class="comment">/*</font>
00119 <font class="comment"> * Constructor</font>
00120 <font class="comment"> */</font>
<a name="l00121"></a><a class="code" href="classNL3D_1_1CTextureBump.html#a1">00121</a> CTextureBump::CTextureBump() : _NormalizationFactor(0.f),
00122                                                            _DisableSharing(false),
00123                                                            _UseAbsoluteOffsets(false),
00124                                                            _ForceNormalize(true)
00125 {
00126         <font class="comment">// mipmapping not supported for now, disable it</font>
00127         ITexture::setFilterMode(ITexture::Linear, ITexture::LinearMipMapOff);
00128 }
00129 
<a name="l00131"></a><a class="code" href="classNL3D_1_1CTextureBump.html#c0">00131</a> <font class="keywordtype">void</font> CTextureBump::setFilterMode(TMagFilter magf, TMinFilter minf)
00132 {       
00133         <a class="code" href="debug_8h.html#a12">nlstop</a>; <font class="comment">// set filter mode not allowed with bump textures (not supported by some GPUs)</font>
00134 }
00135 
<a name="l00136"></a><a class="code" href="classNL3D_1_1CTextureBump.html#a2">00136</a> <font class="keywordtype">void</font> CTextureBump::setHeightMap(ITexture *heightMap)
00137 {
00138         <font class="keywordflow">if</font> (heightMap != <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>)
00139         {
00140                 <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a> = heightMap;
00141                 <a class="code" href="classNL3D_1_1ITexture.html#a0">touch</a>();
00142         }
00143 }
00144 
00145 
<a name="l00147"></a><a class="code" href="classNL3D_1_1CTextureBump.html#a5">00147</a> <font class="keywordtype">void</font> CTextureBump::serial(<a class="code" href="classNLMISC_1_1IStream.html">NLMISC::IStream</a> &amp;f) <font class="keywordflow">throw</font>(NLMISC::EStream)
00148 {
00150         sint ver = f.serialVersion(2);
00151         ITexture::serial(f);
00152         ITexture *tex = NULL;   
00153         <font class="keywordflow">if</font> (f.isReading())
00154         {               
00155                 f.serialPolyPtr(tex);
00156                 _HeightMap = tex;
00157                 touch();
00158         }
00159         <font class="keywordflow">else</font>
00160         {
00161                 tex = _HeightMap;
00162                 f.serialPolyPtr(tex);
00163         }
00164         f.serial(_DisableSharing);
00165         <font class="keywordflow">if</font> (ver &gt;= 1)
00166         {
00167                 f.serial(_UseAbsoluteOffsets);
00168         }
00169         <font class="keywordflow">if</font> (ver &gt;= 2)
00170         {
00171                 f.serial(_ForceNormalize);
00172         }
00173 }
00174 
<a name="l00176"></a><a class="code" href="classNL3D_1_1CTextureBump.html#b0">00176</a> <font class="keywordtype">void</font> CTextureBump::doGenerate()
00177 {       
00178         <font class="keywordflow">if</font> (!<a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>)
00179         {
00180                 <a class="code" href="classNLMISC_1_1CBitmap.html#a3">makeDummy</a>();
00181                 <font class="keywordflow">return</font>;
00182         }
00183         <font class="comment">// generate the height map</font>
00184         <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;generate();
00185         <font class="keywordflow">if</font> (!<a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;convertToType(CBitmap::RGBA))
00186         {
00187                 <a class="code" href="classNLMISC_1_1CBitmap.html#a3">makeDummy</a>();
00188                 <font class="keywordflow">return</font>;
00189         }
00190         <a class="code" href="classNLMISC_1_1CBitmap.html#a12">releaseMipMaps</a>();
00191         uint <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a> = <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getWidth();
00192         uint <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a> = <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getHeight();
00193         CBitmap::resize(<a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getWidth(), <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getHeight(), CBitmap::DsDt);        
00194         <font class="comment">// build the DsDt map</font>
00195         <a class="code" href="namespaceNL3D.html#a463">BuildDsDt</a>((uint32 *) &amp;(<a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getPixels()[0]), <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a>, <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>, (uint16 *) &amp;(<a class="code" href="classNLMISC_1_1CBitmap.html#z277_0">getPixels</a>()[0]), <a class="code" href="classNL3D_1_1CTextureBump.html#n3">_UseAbsoluteOffsets</a>);
00196 
00197         <font class="comment">// Normalize the map if needed</font>
00198         <font class="keywordflow">if</font> (_ForceNormalize)
00199         {
00200                 <a class="code" href="classNL3D_1_1CTextureBump.html#n1">_NormalizationFactor</a> = <a class="code" href="namespaceNL3D.html#a464">NormalizeDsDt</a>((uint16 *) &amp;(<a class="code" href="classNLMISC_1_1CBitmap.html#z277_0">getPixels</a>()[0]), <a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a>, <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>, <a class="code" href="classNL3D_1_1CTextureBump.html#n3">_UseAbsoluteOffsets</a>);
00201         }
00202 
00203         <font class="keywordflow">if</font> (<a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getReleasable())
00204         {
00205                 <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;release();
00206         }
00207 }
00208 
<a name="l00210"></a><a class="code" href="classNL3D_1_1CTextureBump.html#a15">00210</a> <font class="keywordtype">void</font> CTextureBump::release()
00211 {
00212         ITexture::release();
00213         <font class="keywordflow">if</font> (<a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a> != NULL)
00214         {
00215                 <font class="keywordflow">if</font> (<a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getReleasable())
00216                 {
00217                         <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;release();
00218                 }
00219         }
00220 }
00221 
00222 
<a name="l00224"></a><a class="code" href="classNL3D_1_1CTextureBump.html#a6">00224</a> <font class="keywordtype">bool</font>    CTextureBump::supportSharing()<font class="keyword"> const</font>
00225 <font class="keyword"></font>{       
00226         <font class="keywordflow">return</font> !<a class="code" href="classNL3D_1_1CTextureBump.html#n2">_DisableSharing</a> &amp;&amp; <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a> &amp;&amp; <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;supportSharing();  
00227 }
00228 
00229 
<a name="l00231"></a><a class="code" href="classNL3D_1_1CTextureBump.html#a7">00231</a>         std::string     CTextureBump::getShareName()<font class="keyword"> const</font>
00232 <font class="keyword"></font>{
00233         <a class="code" href="debug_8h.html#a6">nlassert</a>(<a class="code" href="classNL3D_1_1CTextureBump.html#a6">supportSharing</a>());
00234         <font class="keywordflow">return</font> <font class="stringliteral">"BumpDsDt:"</font> + <a class="code" href="classNL3D_1_1CTextureBump.html#n0">_HeightMap</a>-&gt;getShareName();
00235 }
00236 
00237 
00238 } <font class="comment">// NL3D</font>
</pre></div>

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