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120 lines
4.5 KiB
C
120 lines
4.5 KiB
C
#ifndef VLOOKUP_H
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#define VLOOKUP_H
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/*----------------------------------------------------------------------
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Copyright (c) 2004 Open Dynamics Framework Group
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www.physicstools.org
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided
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that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions
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and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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Neither the name of the Open Dynamics Framework Group nor the names of its contributors may
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be used to endorse or promote products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE INTEL OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------*/
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// http://codesuppository.blogspot.com
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//
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// mailto: jratcliff@infiniplex.net
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//
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// http://www.amillionpixels.us
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//
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// CodeSnippet provided by John W. Ratcliff
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// on March 23, 2006.
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//
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// mailto: jratcliff@infiniplex.net
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//
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// Personal website: http://jratcliffscarab.blogspot.com
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// Coding Website: http://codesuppository.blogspot.com
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// FundRaising Blog: http://amillionpixels.blogspot.com
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// Fundraising site: http://www.amillionpixels.us
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// New Temple Site: http://newtemple.blogspot.com
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//
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// This snippet shows how to 'hide' the complexity of
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// the STL by wrapping some useful piece of functionality
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// around a handful of discrete API calls.
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//
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// This API allows you to create an indexed triangle list
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// from a collection of raw input triangles. Internally
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// it uses an STL set to build the lookup table very rapidly.
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//
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// Here is how you would use it to build an indexed triangle
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// list from a raw list of triangles.
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//
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// (1) create a 'VertexLookup' interface by calling
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//
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// VertexLook vl = Vl_createVertexLookup();
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//
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// (2) For each vertice in each triangle call:
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//
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// unsigned int i1 = Vl_getIndex(vl,p1);
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// unsigned int i2 = Vl_getIndex(vl,p2);
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// unsigned int i3 = Vl_getIndex(vl,p3);
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//
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// save the 3 indices into your triangle list array.
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//
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// (3) Get the vertex array by calling:
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//
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// const float *vertices = Vl_getVertices(vl);
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//
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// (4) Get the number of vertices so you can copy them into
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// your own buffer.
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// unsigned int vcount = Vl_getVcount(vl);
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//
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// (5) Release the VertexLookup interface when you are done with it.
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// Vl_releaseVertexLookup(vl);
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//
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// Teaches the following lessons:
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//
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// How to wrap the complexity of STL and C++ classes around a
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// simple API interface.
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//
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// How to use an STL set and custom comparator operator for
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// a complex data type.
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//
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// How to create a template class.
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//
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// How to achieve significant performance improvements by
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// taking advantage of built in STL containers in just
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// a few lines of code.
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//
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// You could easily modify this code to support other vertex
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// formats with any number of interpolants.
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//
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// Hide C++ classes from the rest of your application by
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// keeping them in the CPP and wrapping them in a namespace
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// Uses an STL set to create an index table for a bunch of vertex positions
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// used typically to re-index a collection of raw triangle data.
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typedef void * VertexLookup;
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VertexLookup Vl_createVertexLookup(void);
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void Vl_releaseVertexLookup(VertexLookup vlook);
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unsigned int Vl_getIndex(VertexLookup vlook,const float *pos); // get index.
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const float * Vl_getVertices(VertexLookup vlook);
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unsigned int Vl_getVcount(VertexLookup vlook);
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#endif
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