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      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 
    110