src/glu/sgi/libnurbs/nurbtess/primitiveStream.h

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  21  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Except as contained in this notice, the name of Silicon Graphics, Inc.
  26  * shall not be used in advertising or otherwise to promote the sale, use or
  27  * other dealings in this Software without prior written authorization from
  28  * Silicon Graphics, Inc.
  29  */
  30 /*
  31 ** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/nurbtess/primitiveStream.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
  32 */
  33
  34 /*we do not use the constans GL_... so that this file is independent of
  35  *<GL/gl.h>
  36  */
  37
  38 #ifndef _PRIMITIVE_STREAM_H
  39 #define _PRIMITIVE_STREAM_H
  40
  41 enum {PRIMITIVE_STREAM_FAN, PRIMITIVE_STREAM_STRIP};
  42
  43 #include "definitions.h"
  44
  45 class primStream {
  46   Int *lengths; /*length[i]=number of vertices of ith primitive*/
  47   Int *types; /*each primive has a type: FAN or STREAM*/
  48   Real *vertices; /*the size >= 2 * num_vertices, each vertex (u,v)*/
  49
  50   /*the following size information are used for dynamic arrays*/
  51   Int index_lengths; /*the current available entry*/
  52   Int size_lengths; /*the allocated size of the array: lengths*/
  53   Int index_vertices;
  54   Int size_vertices;
  55
  56   /*the vertex is inserted one by one. counter is used to
  57    *count the number of vertices which have been inserted so far in
  58    *the current primitive
  59    */
  60   Int counter;
  61
  62 public:
  63   primStream(Int sizeLengths, Int sizeVertices);
  64   ~primStream();
  65
  66   Int get_n_prims() //num of primitives
  67     {
  68       return index_lengths;
  69     }
  70   Int get_type(Int i)  //the type of ith primitive
  71     {
  72       return  types[i];
  73     }
  74   Int get_length(Int i) //the length of the ith primitive
  75     {
  76       return lengths[i];
  77     }
  78   Real* get_vertices() {return vertices;}
  79
  80   /*the begining of inserting a new primitive.
  81    *reset counter to be 0.
  82    */
  83   void begin();
  84   void insert(Real u, Real v);
  85   void insert(Real v[2]) {insert(v[0], v[1]);}
  86   void end(Int type);
  87
  88   Int num_triangles();
  89
  90   void triangle(Real A[2], Real B[2], Real C[2])
  91     {
  92       begin();
  93       insert(A);
  94       insert(B);
  95       insert(C);
  96       end(PRIMITIVE_STREAM_FAN);
  97     }
  98   void print();
  99   void draw(); /*using GL to draw the primitives*/
 100 };
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 108
 109 #endif
 110