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

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 **
  34 */
  35 /*
  36 */
  37
  38 /*we do not use the constans GL_... so that this file is independent of
  39  *<GL/gl.h>
  40  */
  41
  42 #ifndef _PRIMITIVE_STREAM_H
  43 #define _PRIMITIVE_STREAM_H
  44
  45 enum {PRIMITIVE_STREAM_FAN, PRIMITIVE_STREAM_STRIP};
  46
  47 #include "definitions.h"
  48
  49 class primStream {
  50   Int *lengths; /*length[i]=number of vertices of ith primitive*/
  51   Int *types; /*each primive has a type: FAN or STREAM*/
  52   Real *vertices; /*the size >= 2 * num_vertices, each vertex (u,v)*/
  53
  54   /*the following size information are used for dynamic arrays*/
  55   Int index_lengths; /*the current available entry*/
  56   Int size_lengths; /*the allocated size of the array: lengths*/
  57   Int index_vertices;
  58   Int size_vertices;
  59
  60   /*the vertex is inserted one by one. counter is used to
  61    *count the number of vertices which have been inserted so far in
  62    *the current primitive
  63    */
  64   Int counter;
  65
  66 public:
  67   primStream(Int sizeLengths, Int sizeVertices);
  68   ~primStream();
  69
  70   Int get_n_prims() //num of primitives
  71     {
  72       return index_lengths;
  73     }
  74   Int get_type(Int i)  //the type of ith primitive
  75     {
  76       return  types[i];
  77     }
  78   Int get_length(Int i) //the length of the ith primitive
  79     {
  80       return lengths[i];
  81     }
  82   Real* get_vertices() {return vertices;}
  83
  84   /*the begining of inserting a new primitive.
  85    *reset counter to be 0.
  86    */
  87   void begin();
  88   void insert(Real u, Real v);
  89   void insert(Real v[2]) {insert(v[0], v[1]);}
  90   void end(Int type);
  91
  92   Int num_triangles();
  93
  94   void triangle(Real A[2], Real B[2], Real C[2])
  95     {
  96       begin();
  97       insert(A);
  98       insert(B);
  99       insert(C);
 100       end(PRIMITIVE_STREAM_FAN);
 101     }
 102   void print();
 103   void draw(); /*using GL to draw the primitives*/
 104 };
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 111
 112
 113 #endif
 114