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<h1>uv.cpp</h1><a href="uv_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment">    pbrt source code Copyright(c) 1998-2007 Matt Pharr and Greg Humphreys.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This file is part of pbrt.</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">    pbrt is free software; you can redistribute it and/or modify</span>
<a name="l00008"></a>00008 <span class="comment">    it under the terms of the GNU General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment">    the Free Software Foundation; either version 2 of the License, or</span>
<a name="l00010"></a>00010 <span class="comment">    (at your option) any later version.  Note that the text contents of</span>
<a name="l00011"></a>00011 <span class="comment">    the book "Physically Based Rendering" are *not* licensed under the</span>
<a name="l00012"></a>00012 <span class="comment">    GNU GPL.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">    pbrt is distributed in the hope that it will be useful,</span>
<a name="l00015"></a>00015 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00016"></a>00016 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00017"></a>00017 <span class="comment">    GNU General Public License for more details.</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment">    You should have received a copy of the GNU General Public License</span>
<a name="l00020"></a>00020 <span class="comment">    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment"> */</span>
<a name="l00023"></a>00023 
<a name="l00024"></a>00024 <span class="comment">// uv.cpp*</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="pbrt_8h.html">pbrt.h</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="texture_8h.html">texture.h</a>"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="paramset_8h.html">paramset.h</a>"</span>
<a name="l00028"></a>00028 <span class="comment">// UVTexture Declarations</span>
<a name="l00029"></a><a class="code" href="classUVTexture.html">00029</a> <span class="keyword">class </span><a class="code" href="classUVTexture.html">UVTexture</a> : <span class="keyword">public</span> <a class="code" href="classTexture.html">Texture</a>&lt;Spectrum&gt; {
<a name="l00030"></a>00030 <span class="keyword">public</span>:
<a name="l00031"></a>00031         <span class="comment">// UVTexture Public Methods</span>
<a name="l00032"></a><a class="code" href="classUVTexture.html#6e958057ff9254042bc0a166818d4c13">00032</a>         <a class="code" href="classUVTexture.html#6e958057ff9254042bc0a166818d4c13">UVTexture</a>(<a class="code" href="classTextureMapping2D.html">TextureMapping2D</a> *m) {
<a name="l00033"></a>00033                 <a class="code" href="classUVTexture.html#79dc4f970e7b47b3b8a3dd152e29a2ec">mapping</a> = m;
<a name="l00034"></a>00034         }
<a name="l00035"></a><a class="code" href="classUVTexture.html#8a9cab12d825771644a4197512265fdd">00035</a>         <a class="code" href="classUVTexture.html#8a9cab12d825771644a4197512265fdd">~UVTexture</a>() {
<a name="l00036"></a>00036                 <span class="keyword">delete</span> <a class="code" href="classUVTexture.html#79dc4f970e7b47b3b8a3dd152e29a2ec">mapping</a>;
<a name="l00037"></a>00037         }
<a name="l00038"></a><a class="code" href="classUVTexture.html#5580d41c093c6a921ee6ecc8c9902c2d">00038</a>         <a class="code" href="classSpectrum.html">Spectrum</a> <a class="code" href="classUVTexture.html#5580d41c093c6a921ee6ecc8c9902c2d">Evaluate</a>(<span class="keyword">const</span> <a class="code" href="structDifferentialGeometry.html">DifferentialGeometry</a> &amp;dg)<span class="keyword"> const </span>{
<a name="l00039"></a>00039                 <span class="keywordtype">float</span> s, t, dsdx, dtdx, dsdy, dtdy;
<a name="l00040"></a>00040                 <a class="code" href="classUVTexture.html#79dc4f970e7b47b3b8a3dd152e29a2ec">mapping</a>-&gt;<a class="code" href="classTextureMapping2D.html#cc29e80d8dfe790cfa22da670ce5529f">Map</a>(dg, &amp;s, &amp;t, &amp;dsdx, &amp;dtdx, &amp;dsdy, &amp;dtdy);
<a name="l00041"></a>00041                 <span class="keywordtype">float</span> cs[<a class="code" href="pbrt_8h.html#061ae25c27c9d5f03a3d496c3016ba9e">COLOR_SAMPLES</a>];
<a name="l00042"></a>00042                 memset(cs, 0, <a class="code" href="pbrt_8h.html#061ae25c27c9d5f03a3d496c3016ba9e">COLOR_SAMPLES</a> * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));
<a name="l00043"></a>00043                 cs[0] = s - <a class="code" href="pbrt_8h.html#02648670ea7bf29f5782902cd9aa87c1">Floor2Int</a>(s);
<a name="l00044"></a>00044                 cs[1] = t - <a class="code" href="pbrt_8h.html#02648670ea7bf29f5782902cd9aa87c1">Floor2Int</a>(t);
<a name="l00045"></a>00045                 <span class="keywordflow">return</span> <a class="code" href="classSpectrum.html">Spectrum</a>(cs);
<a name="l00046"></a>00046         }
<a name="l00047"></a>00047 <span class="keyword">private</span>:
<a name="l00048"></a><a class="code" href="classUVTexture.html#79dc4f970e7b47b3b8a3dd152e29a2ec">00048</a>         <a class="code" href="classTextureMapping2D.html">TextureMapping2D</a> *<a class="code" href="classUVTexture.html#79dc4f970e7b47b3b8a3dd152e29a2ec">mapping</a>;
<a name="l00049"></a>00049 };
<a name="l00050"></a>00050 <span class="comment">// UVTexture Method Definitions</span>
<a name="l00051"></a><a class="code" href="uv_8cpp.html#a327196792a520cf6474d6d070066738">00051</a> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> <a class="code" href="pbrt_8h.html#808e08638be3cba36e36759e5b150de0">DLLEXPORT</a> <a class="code" href="classTexture.html">Texture&lt;float&gt;</a> * <a class="code" href="bilerp_8cpp.html#a327196792a520cf6474d6d070066738">CreateFloatTexture</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;tex2world,
<a name="l00052"></a>00052                 <span class="keyword">const</span> <a class="code" href="classTextureParams.html">TextureParams</a> &amp;tp) {
<a name="l00053"></a>00053         <span class="keywordflow">return</span> NULL;
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055 
<a name="l00056"></a><a class="code" href="uv_8cpp.html#310da60fe3129572e26e896019bb4f7f">00056</a> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> <a class="code" href="pbrt_8h.html#808e08638be3cba36e36759e5b150de0">DLLEXPORT</a> <a class="code" href="classTexture.html">Texture&lt;Spectrum&gt;</a> * <a class="code" href="bilerp_8cpp.html#310da60fe3129572e26e896019bb4f7f">CreateSpectrumTexture</a>(<span class="keyword">const</span> <a class="code" href="classTransform.html">Transform</a> &amp;tex2world,
<a name="l00057"></a>00057                 <span class="keyword">const</span> <a class="code" href="classTextureParams.html">TextureParams</a> &amp;tp) {
<a name="l00058"></a>00058         <span class="comment">// Initialize 2D texture mapping _map_ from _tp_</span>
<a name="l00059"></a>00059         <a class="code" href="classTextureMapping2D.html">TextureMapping2D</a> *map = NULL;
<a name="l00060"></a>00060         <span class="keywordtype">string</span> type = tp.<a class="code" href="classTextureParams.html#bdf8f09f3693e60261da0493d5e065b8">FindString</a>(<span class="stringliteral">"mapping"</span>);
<a name="l00061"></a>00061         <span class="keywordflow">if</span> (type == <span class="stringliteral">""</span> || type == <span class="stringliteral">"uv"</span>) {
<a name="l00062"></a>00062                 <span class="keywordtype">float</span> su = tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"uscale"</span>, 1.);
<a name="l00063"></a>00063                 <span class="keywordtype">float</span> sv = tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"vscale"</span>, 1.);
<a name="l00064"></a>00064                 <span class="keywordtype">float</span> du = tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"udelta"</span>, 0.);
<a name="l00065"></a>00065                 <span class="keywordtype">float</span> dv = tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"vdelta"</span>, 0.);
<a name="l00066"></a>00066                 map = <span class="keyword">new</span> <a class="code" href="classUVMapping2D.html">UVMapping2D</a>(su, sv, du, dv);
<a name="l00067"></a>00067         }
<a name="l00068"></a>00068         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (type == <span class="stringliteral">"spherical"</span>) map = <span class="keyword">new</span> <a class="code" href="classSphericalMapping2D.html">SphericalMapping2D</a>(tex2world.<a class="code" href="classTransform.html#ced6cc3fb16b20846fcee5aaf6432f49">GetInverse</a>());
<a name="l00069"></a>00069         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (type == <span class="stringliteral">"cylindrical"</span>) map = <span class="keyword">new</span> <a class="code" href="classCylindricalMapping2D.html">CylindricalMapping2D</a>(tex2world.<a class="code" href="classTransform.html#ced6cc3fb16b20846fcee5aaf6432f49">GetInverse</a>());
<a name="l00070"></a>00070         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (type == <span class="stringliteral">"planar"</span>)
<a name="l00071"></a>00071                 map = <span class="keyword">new</span> <a class="code" href="classPlanarMapping2D.html">PlanarMapping2D</a>(tp.<a class="code" href="classTextureParams.html#1625f430ef9f25383446562fecbb27db">FindVector</a>(<span class="stringliteral">"v1"</span>, <a class="code" href="classVector.html">Vector</a>(1,0,0)),
<a name="l00072"></a>00072                         tp.<a class="code" href="classTextureParams.html#1625f430ef9f25383446562fecbb27db">FindVector</a>(<span class="stringliteral">"v2"</span>, <a class="code" href="classVector.html">Vector</a>(0,1,0)),
<a name="l00073"></a>00073                         tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"udelta"</span>, 0.f), tp.<a class="code" href="classTextureParams.html#515fcaebd83191597efb444595738411">FindFloat</a>(<span class="stringliteral">"vdelta"</span>, 0.f));
<a name="l00074"></a>00074         <span class="keywordflow">else</span> {
<a name="l00075"></a>00075                 <a class="code" href="pbrt_8h.html#d1a16fc9ced4ddc376b9d3e6607be15e">Error</a>(<span class="stringliteral">"2D texture mapping \"%s\" unknown"</span>, type.c_str());
<a name="l00076"></a>00076                 map = <span class="keyword">new</span> <a class="code" href="classUVMapping2D.html">UVMapping2D</a>;
<a name="l00077"></a>00077         }
<a name="l00078"></a>00078         <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classUVTexture.html">UVTexture</a>(map);
<a name="l00079"></a>00079 }
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