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<h1>csgfx/vertexlistwalker.h</h1><a href="vertexlistwalker_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (C) 2005 by Marten Svanfeldt</span>
<a name="l00003"></a>00003 <span class="comment"> (C) 2006 by Frank Richter</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> This library is free software; you can redistribute it and/or</span>
<a name="l00006"></a>00006 <span class="comment"> modify it under the terms of the GNU Library General Public</span>
<a name="l00007"></a>00007 <span class="comment"> License as published by the Free Software Foundation; either</span>
<a name="l00008"></a>00008 <span class="comment"> version 2 of the License, or (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment"> This library is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00013"></a>00013 <span class="comment"> Library General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment"> You should have received a copy of the GNU Library General Public</span>
<a name="l00016"></a>00016 <span class="comment"> License along with this library; if not, write to the Free</span>
<a name="l00017"></a>00017 <span class="comment"> Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00018"></a>00018 <span class="comment">*/</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="preprocessor">#ifndef __CS_CSGFX_VERTEXLISTWALKER_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define __CS_CSGFX_VERTEXLISTWALKER_H__</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include "<a class="code" href="rbuflock_8h.html" title="Helper class for convenient locking/unlocking of an iRenderBuffer.">cstool/rbuflock.h</a>"</span>
<a name="l00024"></a>00024
<a name="l00041"></a>00041 <span class="keyword">template</span><<span class="keyword">typename</span> Tbase, <span class="keyword">typename</span> Tcomplex = Tbase>
<a name="l00042"></a><a class="code" href="classcsVertexListWalker.html">00042</a> <span class="keyword">class </span><a class="code" href="classcsVertexListWalker.html" title="Helper class to make it easier to iterate over elements from renderbuffers, with...">csVertexListWalker</a>
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 <span class="keyword">public</span>:
<a name="l00055"></a><a class="code" href="classcsVertexListWalker.html#8bdddd21800fdeab268bce050656c267">00055</a> <a class="code" href="classcsVertexListWalker.html#8bdddd21800fdeab268bce050656c267" title="Construct new walker.">csVertexListWalker</a> (<a class="code" href="structiRenderBuffer.html" title="This is a general buffer.">iRenderBuffer</a>* buffer, <span class="keywordtype">size_t</span> desiredComponents = 0,
<a name="l00056"></a>00056 <span class="keyword">const</span> Tbase* defaultComponents = 0) : currElement (0), bufLock (buffer),
<a name="l00057"></a>00057 defaultComponents (defaultComponents)
<a name="l00058"></a>00058 {
<a name="l00059"></a>00059 bufferComponents = buffer-><a class="code" href="structiRenderBuffer.html#39e622dc64c4acc4a3ed2df051e10598" title="Gets the number of components per element.">GetComponentCount</a> ();
<a name="l00060"></a>00060 components = (desiredComponents != 0) ? desiredComponents :
<a name="l00061"></a>00061 bufferComponents;
<a name="l00062"></a>00062 <a class="code" href="cssysdef_8h.html#c380bd47888ecfe73e7b7a40b6f827a1" title="Assertion.">CS_ASSERT</a> (components <= maxComponents);
<a name="l00063"></a>00063 elements = buffer-><a class="code" href="structiRenderBuffer.html#2c43d2f649e4725a8e86abfa5dfbfffe" title="Number of elements in a buffer.">GetElementCount</a>();
<a name="l00064"></a>00064 compType = buffer-><a class="code" href="structiRenderBuffer.html#23e7848455338c7636d6a97e5a09c7c8" title="Gets the component type (float, int, etc).">GetComponentType</a>();
<a name="l00065"></a>00065 FetchCurrentElement();
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067
<a name="l00069"></a>00069
<a name="l00070"></a><a class="code" href="classcsVertexListWalker.html#01b038d7bdaa4f127a8e02cd0eae9ad6">00070</a> <a class="code" href="classcsVertexListWalker.html#01b038d7bdaa4f127a8e02cd0eae9ad6" title="Get current element.">operator Tbase const*</a>()<span class="keyword"> const</span>
<a name="l00071"></a>00071 <span class="keyword"> </span>{
<a name="l00072"></a>00072 <a class="code" href="cssysdef_8h.html#c380bd47888ecfe73e7b7a40b6f827a1" title="Assertion.">CS_ASSERT</a>(currElement<elements);
<a name="l00073"></a>00073 <span class="keywordflow">return</span> convertedComps;
<a name="l00074"></a>00074 }
<a name="l00075"></a><a class="code" href="classcsVertexListWalker.html#828af5a6ba8eb51b8f7a8a65584666fd">00075</a> <span class="keyword">const</span> Tcomplex& <a class="code" href="classcsVertexListWalker.html#828af5a6ba8eb51b8f7a8a65584666fd">operator*</a>()<span class="keyword"> const</span>
<a name="l00076"></a>00076 <span class="keyword"> </span>{
<a name="l00077"></a>00077 <a class="code" href="cssysdef_8h.html#c380bd47888ecfe73e7b7a40b6f827a1" title="Assertion.">CS_ASSERT</a>(currElement<elements);
<a name="l00078"></a>00078 <span class="keyword">const</span> Tbase* x = convertedComps;
<a name="l00079"></a>00079 <span class="keyword">const</span> Tcomplex* y = (Tcomplex*)x;
<a name="l00080"></a>00080 <span class="keywordflow">return</span> *y;
<a name="l00081"></a>00081 }
<a name="l00083"></a>00083
<a name="l00085"></a>00085
<a name="l00086"></a><a class="code" href="classcsVertexListWalker.html#cf29ddde83a5e8fd0f8350c8963b958c">00086</a> <a class="code" href="classcsVertexListWalker.html" title="Helper class to make it easier to iterate over elements from renderbuffers, with...">csVertexListWalker</a>& <a class="code" href="classcsVertexListWalker.html#cf29ddde83a5e8fd0f8350c8963b958c" title="Set current element to the next.">operator++ </a>()
<a name="l00087"></a>00087 {
<a name="l00088"></a>00088 currElement++;
<a name="l00089"></a>00089 FetchCurrentElement();
<a name="l00090"></a>00090 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00091"></a>00091 }
<a name="l00093"></a>00093
<a name="l00095"></a><a class="code" href="classcsVertexListWalker.html#1d120e497d5937e5238ba8296e2cdbbb">00095</a> <span class="keywordtype">void</span> <a class="code" href="classcsVertexListWalker.html#1d120e497d5937e5238ba8296e2cdbbb" title="Start from the beginning.">ResetState</a> ()
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097 currElement = 0;
<a name="l00098"></a>00098 FetchCurrentElement();
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100 <span class="keyword">private</span>:
<a name="l00102"></a>00102 <span class="keywordtype">size_t</span> elements;
<a name="l00104"></a>00104 <span class="keywordtype">size_t</span> currElement;
<a name="l00106"></a>00106 <a class="code" href="classcsRenderBufferLock.html" title="Helper class for convenient locking/unlocking of an iRenderBuffer.">csRenderBufferLock<uint8></a> bufLock;
<a name="l00107"></a>00107
<a name="l00109"></a>00109 <span class="keywordtype">size_t</span> components;
<a name="l00111"></a>00111 <span class="keywordtype">size_t</span> bufferComponents;
<a name="l00113"></a>00113 <span class="keyword">enum</span> { maxComponents = 4 };
<a name="l00115"></a>00115 Tbase convertedComps[maxComponents];
<a name="l00117"></a>00117 <span class="keyword">const</span> Tbase* <span class="keyword">const</span> defaultComponents;
<a name="l00119"></a>00119 <a class="code" href="group__gfx3d.html#g2e793d8189bb8566ed81c168875f452b" title="Type of components.">csRenderBufferComponentType</a> compType;
<a name="l00120"></a>00120
<a name="l00122"></a>00122 <span class="keyword">const</span> Tbase GetDefaultComponent (<span class="keywordtype">size_t</span> n)
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 <span class="keywordflow">return</span> (defaultComponents != 0) ? defaultComponents[n] :
<a name="l00125"></a>00125 ((n == 3) ? Tbase(1) : Tbase(0));
<a name="l00126"></a>00126 }
<a name="l00128"></a>00128 <span class="keyword">template</span><<span class="keyword">typename</span> C>
<a name="l00129"></a>00129 <span class="keywordtype">void</span> FetchCurrentElementReal()
<a name="l00130"></a>00130 {
<a name="l00131"></a>00131 <a class="code" href="group__util.html#gdde6aaee8457bee49c2a92621fe22b79" title="unsigned 8-bit integer (0..255)">uint8</a>* data = bufLock + (currElement * bufferComponents * <span class="keyword">sizeof</span> (C));
<a name="l00132"></a>00132 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> c = 0; c < components; c++)
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134 convertedComps[c] =
<a name="l00135"></a>00135 (c < bufferComponents) ? Tbase(*(C*)data) :
<a name="l00136"></a>00136 GetDefaultComponent (c);
<a name="l00137"></a>00137 data += <span class="keyword">sizeof</span> (C);
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 }
<a name="l00141"></a>00141 <span class="keywordtype">void</span> FetchCurrentElement()
<a name="l00142"></a>00142 {
<a name="l00143"></a>00143 <span class="comment">/* Avoid reading beyond buffer end</span>
<a name="l00144"></a>00144 <span class="comment"> * Don't assert here since FetchCurrentElement() is also called in</span>
<a name="l00145"></a>00145 <span class="comment"> * legitimate cases (i.e. operator++ while on the last valid element.</span>
<a name="l00146"></a>00146 <span class="comment"> * Assert in retrieval operators, though.</span>
<a name="l00147"></a>00147 <span class="comment"> */</span>
<a name="l00148"></a>00148 <span class="keywordflow">if</span> (currElement >= elements) <span class="keywordflow">return</span>;
<a name="l00149"></a>00149 <span class="keywordflow">switch</span> (compType)
<a name="l00150"></a>00150 {
<a name="l00151"></a>00151 <span class="keywordflow">default</span>:
<a name="l00152"></a>00152 <a class="code" href="cssysdef_8h.html#c380bd47888ecfe73e7b7a40b6f827a1" title="Assertion.">CS_ASSERT</a>(<span class="keyword">false</span>);
<a name="l00153"></a>00153 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452b26ae57b4ddbceb9634861c68516a81d7">CS_BUFCOMP_BYTE</a>:
<a name="l00154"></a>00154 FetchCurrentElementReal<char>();
<a name="l00155"></a>00155 <span class="keywordflow">break</span>;
<a name="l00156"></a>00156 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452b25702e67abcd7290c92062ce2a867a0c">CS_BUFCOMP_UNSIGNED_BYTE</a>:
<a name="l00157"></a>00157 FetchCurrentElementReal<unsigned char>();
<a name="l00158"></a>00158 <span class="keywordflow">break</span>;
<a name="l00159"></a>00159 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452bab6038604aa2bd575bd4351c8343d3a0">CS_BUFCOMP_SHORT</a>:
<a name="l00160"></a>00160 FetchCurrentElementReal<short>();
<a name="l00161"></a>00161 <span class="keywordflow">break</span>;
<a name="l00162"></a>00162 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452b93ac3748f171605ca85ad3dd9e1827fc">CS_BUFCOMP_UNSIGNED_SHORT</a>:
<a name="l00163"></a>00163 FetchCurrentElementReal<unsigned short>();
<a name="l00164"></a>00164 <span class="keywordflow">break</span>;
<a name="l00165"></a>00165 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452ba95b8898b542f169190e6a49ea7cf2b8">CS_BUFCOMP_INT</a>:
<a name="l00166"></a>00166 FetchCurrentElementReal<int>();
<a name="l00167"></a>00167 <span class="keywordflow">break</span>;
<a name="l00168"></a>00168 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452b96a405b29bd36a67e0796c74424387de">CS_BUFCOMP_UNSIGNED_INT</a>:
<a name="l00169"></a>00169 FetchCurrentElementReal<unsigned int>();
<a name="l00170"></a>00170 <span class="keywordflow">break</span>;
<a name="l00171"></a>00171 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452b5df131ffd6ead0cdfa3dc9eea6a78e73">CS_BUFCOMP_FLOAT</a>:
<a name="l00172"></a>00172 FetchCurrentElementReal<float>();
<a name="l00173"></a>00173 <span class="keywordflow">break</span>;
<a name="l00174"></a>00174 <span class="keywordflow">case</span> <a class="code" href="group__gfx3d.html#gg2e793d8189bb8566ed81c168875f452bef38bb2295605b7e873b85cd273a66a1">CS_BUFCOMP_DOUBLE</a>:
<a name="l00175"></a>00175 FetchCurrentElementReal<double>();
<a name="l00176"></a>00176 <span class="keywordflow">break</span>;
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178 }
<a name="l00179"></a>00179 };
<a name="l00180"></a>00180
<a name="l00181"></a>00181 <span class="preprocessor">#endif // __CS_CSGFX_VERTEXLISTWALKER_H__</span>
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