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 */
  32
  33 /*we do not use the constans GL_... so that this file is independent of
  34  *<GL/gl.h>
  35  */
  36
  37 #ifndef _PRIMITIVE_STREAM_H
  38 #define _PRIMITIVE_STREAM_H
  39
  40 enum {PRIMITIVE_STREAM_FAN, PRIMITIVE_STREAM_STRIP};
  41
  42 #include "definitions.h"
  43
  44 class primStream {
  45   Int *lengths; /*length[i]=number of vertices of ith primitive*/
  46   Int *types; /*each primive has a type: FAN or STREAM*/
  47   Real *vertices; /*the size >= 2 * num_vertices, each vertex (u,v)*/
  48
  49   /*the following size information are used for dynamic arrays*/
  50   Int index_lengths; /*the current available entry*/
  51   Int size_lengths; /*the allocated size of the array: lengths*/
  52   Int index_vertices;
  53   Int size_vertices;
  54
  55   /*the vertex is inserted one by one. counter is used to
  56    *count the number of vertices which have been inserted so far in
  57    *the current primitive
  58    */
  59   Int counter;
  60
  61 public:
  62   primStream(Int sizeLengths, Int sizeVertices);
  63   ~primStream();
  64
  65   Int get_n_prims() //num of primitives
  66     {
  67       return index_lengths;
  68     }
  69   Int get_type(Int i)  //the type of ith primitive
  70     {
  71       return  types[i];
  72     }
  73   Int get_length(Int i) //the length of the ith primitive
  74     {
  75       return lengths[i];
  76     }
  77   Real* get_vertices() {return vertices;}
  78
  79   /*the begining of inserting a new primitive.
  80    *reset counter to be 0.
  81    */
  82   void begin();
  83   void insert(Real u, Real v);
  84   void insert(Real v[2]) {insert(v[0], v[1]);}
  85   void end(Int type);
  86
  87   Int num_triangles();
  88
  89   void triangle(Real A[2], Real B[2], Real C[2])
  90     {
  91       begin();
  92       insert(A);
  93       insert(B);
  94       insert(C);
  95       end(PRIMITIVE_STREAM_FAN);
  96     }
  97   void print();
  98   void draw(); /*using GL to draw the primitives*/
  99 };
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 107
 108 #endif
 109